Volume
87, Number 3, July 2006
Cover Photo: White-fronted Geese (Anser albifrons) gleaning rice fields after harvest near Lake Miyajimanuma, in central Hokkaido, Japan, appear to base their behavior on the advantages of group foraging. The geese benefit from aggregation in feeding flocks, because alarms about potential predators are quickly spread through the flock, despite the potential local depletion of food resources. The authors found that a model allowing for incomplete knowledge about the distribution of food resources, combined with the benefits of aggregation, best described both individual flock behavior and the seasonal variation in flock size. For additional photographs associated with the article by T. Amano, K. Ushiyama, S. Moriguchi, G. Fujita, and H. Higuchi, see “Incompletely informed group foragers” in the Photo Gallery.
Visit the Photo Gallery for more photographs submitted by our scientific journal authors.
Table of Contents
(click on a title to view that section)
Governing
Board
ANNOUNCEMENTS
Society Notices
Call for Student Award Judges
Other Notices
Defenders of Wildlife Conservation Support Network
Smithsonian Institution's Monitoring and Assessment of Biodiversity Training Course
Disease Ecology on the Web
EcoSummit
Workshops at The Centre for Research into Ecological and Environmental Modelling (CREEM)
Multivariate Analysis of Ecological Data
PHOTO GALLERY -- Images from articles in our scientific journals
Reproductive Division of Labor. Kirk E. Anderson, Jürgen Gadau, Brendon M. Mott, Robert A. Johnson,
Annette Altamirano, Christoph Strehl, and Jennifer H. Fewell
Incompletely Informed Group Foragers. Tatsuya Amano, Katsumi Ushiyama, Sachiko Moriguchi, Go
Fujita, and Hiroyoshi Higuchi
Forest Disturbances. E. N. Broadbent, D. J. Zarin, G. P. Asner, M. Peña-Claros, A. Cooper, and R. Littell
Tropical Fruit Fly. Pierre-François Duyck, Patrice David, Guillemette Junod, Caroline Brunel, Raphaël
Dupont, and Serge Quilici
Coral Reef Recovery. Helen E. Fox and Roy L. Caldwell
Invasive Argentine Ants. Núria Roura-Pascual, Andrew V. Suarez, Kristina McNyset, Crisanto Gómez,
Pere Pons, Yoshifumi Touyama, Alexander L. Wild, Ferran Gascon, and A. Townsend Peterson
Salmon, Wildlife, and Wine. Joseph E. Merz and Peter B. Moyle
Adding Infection to Injury. Pieter T. J. Johnson, Eric R. Preu, Daniel R. Sutherland, John M. Romansic,
Barbara Han, and Andrew R. Blaustein
Oak Forest Insect Herbivores. June M. Jeffries, Robert J. Marquis, and Rebecca E. Forkner
CONTRIBUTIONS
Commentary
A History of the Ecological Sciences, Part 21. Réaumur and His History of Insects.F. N. Egerton
SEEDS of a New Millenium. SEEDS Scholars
DEPARTMENTS
Emerging Technologies
LINK: A Land Conservation Decision Support Tool
Society Section and Chapter News
Southeastern Chapter Newsletter
The BULLETIN OF THE ECOLOGICAL
SOCIETY OF AMERICA (ISSN 0012-9623)
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The
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GOVERNING BOARD FOR 20052006
President: Nancy B. Grimm, School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501
President-Elect: Alan Covich, Institute of Ecology, University of Georgia, Athens, GA 30602
Past-President: Jerry M. Melillo, Marine Biological Laboratory, Woods Hole, MA 02543
Vice President for Science: Gus R. Shaver, The Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA 02543
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Vice President for Public Affairs: Rich Pouyat, 3315 Hudson St., Baltimore, MD 21224
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Secretary: David W. Inouye, Department of Biology, University of Maryland, College Park, MD 20742-4415
Member-at-Large: P. Dee Boersma, Department of Zoology, University of Washington, Seattle, WA 98195-1800
Member-at-Large: Shahid Naeem, Department of EEEB, Columbia University, New York, NY 10027
Member-at-Large: Dennis Ojima, Natural Resource Ecology Laboratory, Colorado State University, Ft. Collins, CO 80523-1499
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ANNOUNCEMENTS
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REQUEST FOR STUDENT AWARD JUDGES Murray F. Buell Award Judges are needed to evaluate candidates for the Murray F. Buell Award for the outstanding oral presentation by a student and the E. Lucy Braun Award for the outstanding poster presentation by a student at the Annual ESA Meeting at Memphis, Tennessee in 2006. We need to provide each candidate with at least four judges competent in the specific subject of the presentation. Each judge is asked to evaluate 35 papers and/or posters. Current graduate students are not eligible to judge. This is a great way to become involved in an important ESA activity. We desperately need your help! Please complete and send this form by mail, fax, or e-mail to the Chair of the Student Awards Subcommittee: Christopher F. Sacchi, Department of Biology, Kutztown University, Kutztown, PA 19530 USA. Call (610) 683-4314; FAX: (610) 683-4854 or e-mail: [email protected] If you have judged in the past several years, this information is on file. If you do not have to update your information, simply send me an e-mail message, Yes, I can judge this year. Name ______________________________________________________________________________________________ Areas of expertise (check all that apply): Provide a few key words or phrases that describe your interests and expertise: _________________________
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Other Notices
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Defenders of Wildlife Conservation Support Network
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The Smithsonian Institution's Monitoring and Assessment of Biodiversity Program (MAB)
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Disease Ecology On The Web
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The world is experiencing rapid urbanization, industrialization and globalization. The pace, depth, and magnitude of these changes, have exerted severe ecological stresses on humankind living conditions and life support ecosystems across all scales - from local to regional, and global scales. Water shortages, desertification, soil degradation, greenhouse gas emissions, elevated sediment and nutrient fluxes to the coastal seas and other environmental problems are increasingly becoming the common side effects of those human activities. Sustainability can only be assured with an ecological understanding of the complex interactions between environmental, economic, political, and social/cultural factors and with careful planning and management grounded in ecological principles. Ecological complexity and sustainability are becoming a core concept and instrument for improving our common future. |
Workshops at The Centre for Research into Ecological and Environmental Modelling (CREEM)The Centre is hosting three linked workshops in the summer of 2006 in our purpose-built facilities at the University of St Andrews, Scotland. The aim of these workshops is to train participants in the latest methods for design and analysis of distance sampling surveys, including line and point transects. The workshops are taught by leading researchers in the field, using industry-standard software. The first workshop (3 days) will run at an introductory level, and will focus on "conventional" distance sampling methods, as described in the standard reference book Introduction to Distance Sampling. The workshop will be a blend of theory and practice and participants will learn how to use the program “Distance.” Participants will gain a solid grounding in both survey design and methods of analysis for distance sampling surveys. The second workshop (2.5 days) will cover recent advances in distance sampling research and software, as described in the book Advanced Distance Sampling. It is intended for those already familiar with conventional distance sampling methods (e.g., those who have attended an introductory workshop). Participants will learn the use of covariates for modelling the detection function, double-platform methods for when detection at the line or point is not certain, automated survey design, and adaptive sampling. Participants will also learn the more advanced features of “Distance.” The third workshop (2.5 days) will focus on methods of predicting abundance or density of biological data using the "count" method of Hedley and Buckland (Advanced Distance Sampling:Chapter 4, 2004. In these situations variation in animal density/abundance is modeled as functions of covariates such as land cover type, bathymetry, altitude, or depth, or other characteristics collected during a distance sampling survey. General additive models (GAMs) or general linear models (GLMs) will be fitted to estimated densities along transects using a new analytical engine inside the program “Distance.” This is an advanced workshop for those already familiar with distance sampling. For all three workshops, participants are encouraged to bring their own data sets, and can expect to do some preliminary analyses with their data. Participants intending to model their own data in the third workshop will be required to have it formatted according to precise specifications prior to arrival at St. Andrews. Computer sessions take place in our modern PC-classroom (attached to the seminar room); participants can use our computers or bring their own PC laptops. Further details can be found at our web site: Eric Rexstad |
Multivariate Analysis of Ecological Data
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Reproductive Division of Labor |
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This photograph illustrates the article, “Distribution and evolution of genetic caste determination among cryptic lineages of seed-harvester ants Pogonomyrmex barbatus and P. rugosus,” by Kirk E. Anderson, Jürgen Gadau, Brendon M. Mott, Robert A. Johnson, Annette Altimirano, Christoph Strehl, and Jennifer H. Fewell, tentatively scheduled to appear as part of the Special Feature on Interspecific Hybridization in Ants, in Ecology 87(9), September 2006. |
Many species face uncertainties about foraging patch quality in their decision-making processes. White-fronted Geese (Anser albifrons) foraging on harvest remains of rice in Japan represent a typical example. The geese are likely to be uncertain about the distribution of poorly visible rice grains among straw in the harvested fields (Figs. 1 and 2), while seasonal variations in the flock sizes of geese seem to be determined by the trade-off between the costs and benefits of group foraging (Fig. 3), which cannot be explained by existing social foraging models. We developed a new foraging model for incompletely informed foragers that benefit from foraging in groups, where expected gain rates were used for decision making on diet choice, patch departure, and flock joining. This model agreed most closely with the observed patterns, both in the spatial distribution and fat deposition parameters of geese, compared to existing models. Therefore, we concluded that these White-fronted Geese seem to use expected gain rates for decision making with incomplete information on foraging patch quality. |
These photographs are associated with the article by Tatsuya Amano, Katsumi Ushiyama, Sachiko Moriguchi, Go Fujita, and Hiroyoshi Higuchi, “Decision-making rules in group foragers with incomplete information on patch quality: a test with White-fronted Geese using an individual-based model,” which is tentatively scheduled to appear in Ecology 87(11), November 2006. |
A canopy emergent tree (Ficus boliviana), nearly 40 m tall, stretches its branches over the rain forest canopy in a logging concession in lowland Bolivia. During selective logging such trees are felled, producing gaps in the forest canopy. Selective logging in Bolivia, and throughout the Amazon, produces distinctive patterns of forest disturbances, including felling gaps, skid trails, and roads. Recent advances in satellite imagery analysis may help to detect these disturbances, and thus to detect logging activities, over large areas. However, to date the sensitivity of these analyses to forest disturbances in Bolivian forests have not been quantified. |
The influence of forest disturbances from selective logging on new and established remote-sensing analytical methods are investigated in the article by E. N. Broadbent, D. J. Zarin, G. P. Asner, M. Peña-Claros, A. Cooper, and R. Littell, “Recovery of forest structure and spectral properties after selective logging in lowland Bolivia,” published in Ecological Applications 16(3), June 2006. |
The photograph is associated with the article by Pierre-François Duyck, Patrice David, Guillemette Junod, Caroline Brunel, Raphaël Dupont, and Serge Quilici, “Importance of competition mechanisms in successive invasions by polyphagous tephritids in La Réunion Island,” published in Ecology 87(7):1770–1780. |
An undamaged coral reef in Indonesia (Left), adjacent to a crater left by a home-made bomb used for reef fishing (upper right, two years after the blast). There was substantial recovery from single blasts after five years (lower right). However, the multiple blasts characteristic of extensive and continued reef fishing using explosives left a shifting rubble field, producing an unstable substrate for the settlement of new corals, and preventing reef recovery during the seven years of the study. Photo credits; left photo, R. Caldwell; right photos, H. E. Fox. |
The article with which these photographs are associated, by Helen E. Fox and Roy L. Caldwell, “Recovery from blast fishing on coral reefs: a tale of two scales,” is tentatively scheduled to appear in Ecological Applications16(5), October 2006. |
By applying an ecological niche modeling approach, our study examines the role of niche similarities and differences in predicting the geographic potential of a highly successful invasive species. Native to South America, Argentine ants (Linepithema humile) are now established worldwide, causing severe ecological and economic impacts (as seen on the photographs, where Argentine ants tend scale insects on citrus trees in California). In spite of some geographic variations between regions, our model results suggest that ecological niche characteristics of the Argentine ant do not differ markedly between native and invaded ranges at the spatial and temporal scale of our analysis. |
The photographs are associated with the article by Núria Roura-Pascual, Andrew V. Suarez, Kristina McNyset, Crisanto Gómez, Pere Pons, Yoshifumi Touyama, Alexander L. Wild, Ferran Gascon, and A. Townsend Peterson, “Niche differentiation and fine-scale projections for Argentine ants based on remotely sensed data,” tentatively scheduled to appear in Ecological Applications 16(5), October 2006. Photographs by Alexander L. Wild. |
The photographs are associated with an article by Joseph E. Merz and Peter B. Moyle, “Salmon, wildlife, and wine: marine-derived nutrients in human-dominated ecosystems of Central California,” published in Ecological Applications 16(3):999–1009, June 2006. All photographs by Joe Merz. |
The article with which these photographs are associated, by Pieter T. J. Johnson, Eric R. Preu, Daniel R. Sutherland, John M. Romansic, Barbara Han, and Andrew R. Blaustein, “Adding infection to injury: synergistic effects of predation and parasitism on amphibian malformations,” is tentatively scheduled to appear in Ecology 87(9), September 2006. (Top photo) Photograph by P. T. J. Johnson. (Lower four photos) Photography, clearing, and staining credits: Stanley K. Sessions. Used by permission, all rights reserved. |
This study shows that the community of insect herbivores on white oak (Quercus alba L.) changes in concert with that of the plant community across a chronoseries of Missouri oak forests ranging in age from 2 years to 300+ years. Insect herbivore richness and abundance on white oak in the communities pictured here increases with forest age. In addition, insect communities in forests 122-300+ years are uniquely different from those found on white oak in forests of younger age. First row: Eighteen years after harvest, Mark Twain National Forest, Doniphan Ranger District. Over 100 years after harvest, Mark Twain National Forest, Potosi Ranger District. The 300 + year-old Current River Natural Area is one of the few examples of old-growth forest in Missouri. In 1954 this old forest was purchased by Leo Drey, a Missouri forester, to protect it from imminent conversion to whiskey barrels. Mr. Drey donated the forest to the L-A-D Foundation in 2004. These three photos by Matt Jeffries. The remaining photos depict some of the most abundant insect herbivores of white oak (Quercus alba) found in the Missouri Ozark region. Over 260 insect species can be found feeding on Missouri oaks. Because insect diversity increased with increasing forest age, to ages well beyond those normally harvested for timber resources, our results suggest that the timing and spatial distribution of timber harvests may influence insect herbivore diversity on white oak. All insect photos by Robert Marquis. Second row: Chionodes adamas (Hodges) (Gelechiidae) is an abundant spring leaf roller that curls the oak leaf into a sheltering roll. Himella intractata (Morr.) (Noctuidae) is an abundant herbivore on white oak, found only in the spring on expanding leaves. Lambdina fervidaria (Hbn.) (Geometridae), is often abundant in the spring and summer in the Ozarks (final instar shown). Third row: Phyllonorycter fitchella (Clem.) (Gracillaridae), abundant throughout the spring, summer, and fall, is a tiny leaf-miner, feeding within the cell layers of the leaf to form a characteristic blotch. This Stigmella species (Nepticulidae) is a leaf-miner that creates a serpentine path inside the leaf, leaving a dark trail of frass inside. Acronicta increta (Morr.) (Noctuidae) is usually found resting in a “C” shape. The last instar caterpillars can be quite variable in color pattern. There are two generations per season in our region. Fourth row: Pseudotelphusa sp., (Gelechiidae) is known as a leaf-tying ecosystem engineer. The leaf sandwich this moth caterpillar creates by joining leaves with silk anchors provides shelter for many other arboreal arthropods. The caterpillars of Pococera expandens Walker (Pyralidae) are gregarious in early instars and tie multiple leaves into a silken nest. The nests are often filled with frass, as seen in this photo. Psilocorsis reflexella (Pack.) (Oecophoridae) is a late-season leaf tier. The head capsule and exuvium of the previous instar can be seen just above the caterpillar. |
These photographs illustrate the article by June M. Jeffries, Robert J. Marquis, and Rebecca E. Forkner, “Forest age influences oak insect herbivore community structure, richness, and diversity,” published in Ecological Applications 16(3):901–912, June 2006. |
CONTRIBUTIONS
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A History of the Ecological Sciences, Part 21:
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On 21 November 1877, Thomas Henry Huxley gave a talk at Cambridge University, occasioned by the presentation of an honorary LL.D degree to Charles Darwin, in which he commented (Huxley 1900, I:480): “ I know of no one who is to be placed in the same rank with [Darwin] except Réaumur.” Had he spoken a few years later he could have added Louis Pasteur to that tiny group of our greatest biologists. The range of sciences that Réaumur investigated was as broad as Darwin’s, and his lifelong productivity may have been comparable (Wheeler 1926:263–274, Torlais 1961, Grasse 1962, Gough 1975, Drouin 1995), though Réaumur is credited with no scientific theory like Darwin’s theory on evolution by natural selection. Réaumur is remembered for his thermometer (1731), but one historian of meteorology thinks “ his work on thermometry was far below the standard of much of his other scientific work” (Middleton 1966, 1979). Perhaps so, but his thermometer nevertheless dominated France until replaced in revolutionary France by the Centigrade thermometer in 1794 (Birembaut 1958). His thermometric studies may have piqued his interest in the relationship between temperature and the rate at which insects develop. His primary fame and importance rests on his Mémoires pour servir à l’histoire des insectes (six volumes, 1734–1742), which is also where his significance for ecological sciences lies. Because of his studies on insect behavior, Wheeler (1926, 1936) considered him a founder of ethology.
Fig. 1. Réaumur as a young scientist. René-Antoine Ferchault de Réaumur (1683–1757) was from a prominent La Rochelle family, and he probably attended Catholic schools there and elsewhere before going to Paris in 1703. In Paris he studied mathematics under Pierre Varignon, who nominated him for membership in the Académie Royale des Sciences, to which he was admitted in 1708. During his career he was its director 12 times and its subdirector 9 times. French iron and steel production was backward compared to some other European countries, and the government generously supported his experiments to improve this technology. His book on iron production (Réaumur 1722) is translated into English (1956), as are his The Art of Hatching and Bringing Up Domestic Fowls (Réaumur [French edition] 1749, [English edition] 1750), his incomplete memoirs on ants (1926), and part of his memoirs on bees (1800). In French, there is an excellent, if unillustrated, modern anthology of his writings compiled by his biographer, Jean Torlais, that includes extracts from incomplete memoirs on ants, spiders, beetles, frogs, and toads (Réaumur 1939:213–255). (Amphibians and reptiles fell under his concept of “insects.”) His early papers on geometry (1708–1709) were outstanding (Taton 1958), and in 1740 he drew upon mathematics in discussing the construction of honeycombs by bees (Réaumur 1734–1742, V:389, Drouin 1995:206–207). In 1709 he began studying the growth of shells of aquatic animals, and he subsequently investigated a wide range of natural history topics, including the silk of spiders (1710), making purple dye from mollusks (1711), regeneration of crustacean legs (1712), and the production of artificial pearls (1717). His movement toward entomology was gradual, and did not involve abandonment of other investigations. Réaumur’s first notable study on insects was on the clothes moth (1728), and this led to his study of caterpillars in the first volume of his history of insects. He had already written at the beginning of the introduction to Volume I (Réaumur 1734–1742, I, 3; translated by Wheeler in Réaumur 1926:29):
He was right about the countless species of insects, but John Ray’s approach of trying to identify and study those in one’s locality was a good strategy. Fortunately, Réaumur’s volumes are well illustrated. Like Leeuwenhoek, he was no draftsman, but hired one or more women who were competent. His species were identified and named by Carl Linnaeus (1758:362–618) and later restudied by Vallot (1802) and Bodenheimer (1928–1929, I:415–448 and II:379–399). A few determinations remain debatable (Müller and Wheeler 1982), but that probably would have been true even if Réaumur had been more concerned with naming them himself. Hawkmoth caterpillars refused all food except leaves of spurge. He put some of its milky juice on his tongue and soon his mouth was on fire, and washing did not relieve it. Yet hawkmoth caterpillars drank it with no ill effects. When he put caterpillars of the cabbage moth (Mamestra brassicae) and the common dagger-moth (Acronycta sp.) with young cabbages, the next day he failed to find them. Yet the cabbage leaves were gnawed. When he searched the earth in the pots with cabbages, he found them. He returned at night with a candle and found them feeding on the leaves (Miall 1912:254–255).
The first memoir of the second volume concerns the effect of temperature on the time needed for insects to develop, a topic that Swammerdam and Leeuwenhoek had briefly explored. Pupae kept in hothouses in winter produced moths long before others kept in cool places. He also froze some caterpillars in 1736 and later discovered they were still alive when thawed (Rostand 1962a, b). Realizing that insects develop faster in warm weather, Réaumur (1734–1742, II:322–315) attempted to estimate the annual rate of increase for a butterfly, which he knew developed in about a month in warm weather. He had seen adults of the species throughout the year, but since he knew it would develop slower during the winter, he estimated that there were probably seven generations per year. Since females laid 9 to 14 eggs, he used 10 eggs in calculations. Using Leeuwenhoek’s method of calculation (Egerton 1967:2006), he showed that from one breeding pair, 156,250 individuals could be produced in the seventh generation, and that the year’s total was 195,310. Since no such rate of increase was achieved, he concluded that a worm he described limited the increase by eating immature forms. In a following memoir, Réaumur (1734–1742, II:335–339) discussed a plague of caterpillars (Plusia gamma) that had erupted throughout France in June and July 1735. The butterfly involved produced only one batch of eggs in its lifetime. The first generation of the season developed in the spring from eggs that had overwintered. This generation then produced another generation that laid the eggs that next overwintered. A female laid about 400 eggs, which meant that if there were only 20 individuals hatched in a locality in the spring, the second generation could potentially produce 800,000 eggs to overwinter. He then concluded that it was not as important to explain why a plague erupted occasionally, as to explain why it did not happen more often. First, every species of butterfly has parasites and predators, which greatly limit its numbers. Diseases and weather likewise restrict their increase. A plague year would therefore occur when weather favored the butterfly but not its diseases, parasites, or predators. This explanation was in accordance with the fact that caterpillars had been very numerous in autumn 1731, spring 1732, and in 1737. But a plague of the proportions of 1735 had not occurred during those three years because flies that lay eggs in the caterpillars had also been numerous. Réaumur repeated from Richard Bradley’s A General Treatise of Husbandry and Gardening (1721–1724, II:221) the plausible but inaccurate statement that killing two butterflies in August before they reproduced was as good as killing 8000 caterpillars the following June. Memoir 5 in Volume II is on leaf rollers and leaf folders. He explained that one can watch these caterpillars at work by cutting off leaves that are rolled or folded, expelling the caterpillars, and then placing them on other leaves of the same plant. They quickly work to conceal themselves using these leaves, securing their abode with silk threads.
The same leaf that provides shelter is also eaten. Tortrix caterpillars are common on oaks in summer, and sometimes completely strip the trees of leaves. In its rolled leaf, it is screened from view by outer turns of its green case, and can eat inner turns at leisure. It must have a way to escape an enemy. It moves with great agility and often escapes at an open end of its tube, and then drops off the leaf on a silk thread; when all is quiet, it climbs back to its leaf, coiling the thread and eating it. When it outgrows one tube, it builds another; the last one become the chrysalis in which it changes to an adult (Miall 1912:264–265). Réaumur devoted Memoir 11 in Volume II to the enemies of caterpillars, describing in detail many of their predators and parasites. He stressed knowing which species were harmful (believing there were only about a dozen in France), and which animals attack them.
Réaumur made substantial contributions to the knowledge of parasites, studying parasitic fungi, worms, mites, and insects (Bodenheimer 1931:412–414, Théodoridès 1959a). In the preface to Volume II (1736) he reviewed claims for spontaneous generation of insects, and then agreed with Redi, Swammerdam, and Leeuwenhoek that such ideas were undermined by careful study: “No species of insect generates any insect of a species other than its own.” (Réaumur 1734–1742, II:xl). He explained that what we call entomophagos parasites arise in three ways: (a) by the parasite’s eggs introduced from plant leaves, (b) by the parasite fixing its eggs on the body of the caterpillar, and (c) by the parasite laying eggs in the body of the caterpillar. He provided a clear illustration of larvae of the ichneumonid fly Apaneles glomeratus inside a pierid (Whites family) caterpillar (Réaumur 1734–1742, II:Plate 34, reproduced in Théodoridès 1959a:xv). Eventually he observed the flies coming from the worms in the caterpillars (Réaumur 1734–1742, II:440–442). In some larval entomophagos endoparasites he discovered ectoparasites (hyperparasites, pp. 444–445) and species that lay their eggs in the eggs of butterflies (oophagos parasites, p. 448). Leeuwenhoek had discovered that aphids are parthenogenic (Egerton 2006), which attracted great interest. In Volume III, Memoir 9, Réaumur claimed that both winged and wingless aphids are adults, since both are viviparous. Leeuwenhoek had thought the wingless ones were immature and would later acquire wings. Leeuwenhoek had also concluded that ants prey on aphids (they do, rarely, on injured ones; Réaumur 1926:158), but later naturalists had concluded that ants merely drink the honeydew produced by aphids, and Réaumur agreed. He discovered red ants (probably Formica rufa) that live underground with grey aphids (Miall 1912:270). Robert Hooke (1665:185–191), as we have seen (Egerton 2005:95), laid a good foundation for mosquito studies using his microscope, and Réaumur followed his example. When he had the thorax and head of mosquitoes drawn, he and his draftswoman also used either a microscope or magnifying glass (Fig. 5). It is one of six excellent plates he devoted to them. Of course, at the time, no one knew that female mosquitoes transmit deadly microorganisms when they bite, so their status was that of an annoying pest rather than a dangerous one. Nevertheless, three authorities on mosquitoes commented: “Réaumur, in his classic work [1734–1742, IV:615–622], gives a detailed and most interesting account of the egg-laying process in the common house-mosquito, Culex pipens. The account of this wonderful observer is so faithful that we reproduce it here…” (Howard et al. 1912:140). They quoted it in English translation, but it is too long for me to repeat.
Réaumur’s Memoirs 5–13 in Volume V (1740), more than 500 pages, constitute the most important treatise on bees published in the 1700s (Miall 1912:271–274, Théodoridès 1959a:71–74 and 1968:27–31). It is partly translated into English (Réaumur 1800). It includes description and illustrations (reproduced in Théodoridès 1959a:xvi) of Braula caeca, a dipterous ectoparasite of bees, which he called a “pou” (louse) (pp. 711–712 and Plate 38, Figs. 1–3). In the first memoir of Volume VI he reported that inside the bodies of bumble bee (Bombus) queens he found and illustrated (Plate 4, reproduced in Théodoridès 1959a:vii) clusters of worms. Sometimes the cluster was as large as a small cherry, and at first he thought they were the “germs” (sperm) that enter the eggs, but further study showed they were eel-like worms that live at the expense of the female. Furthermore, they prevented her eggs from developing (Réaumur 1734–1742, VI:22–23). Théodoridès (1959a:vi) tells us that this nematode (Sphaerularia bombi) was only officially named and described in 1837 by Léon Dufour. Réaumur described in detail, and had illustrated in detail, flies that lay eggs on or in the skin of mammals (illustrations reproduced in Théodoridès 1959a:xvii–xxiii). Particularly innovative was his illustration of fly larvae and pupae that infect the pharynx of deer (Fig. 6).
Réaumur had intended to publish a seventh volume of his insect histories, and he made a good start on it (Réaumur 1939:213–255). His seven memoirs on beetles for this volume was virtually complete, with 21 plates having numerous illustrations, yet it remained unpublished until 1955. It merits the detailed attention of a historian of entomology, but I pass over it here in favor of his incomplete memoir on ants, which is briefer, but has the advantage of being about social insects, which have more general appeal than species having solitary habits, and is available in both French and English versions. The reason William Morton Wheeler chose to translate Réaumur’s manuscript on ants rather than the one on beetles is obvious: Wheeler was a leading authority on ants (Evans and Evans 1970). Réaumur wrote “Histoire des fourmis” for Volume VII, probably between October 1743 and the end of January 1744 (Wheeler 1926:xiv), though he set it aside before he completed it. Wheeler first edited and published it with annotated translation in 1926; the “Histoire des fourmis” and part of his treatise on bees remain Réaumur’s only substantial writings on insects in English. Much of the treatise on ants is of ecological interest. His experiments on ants were innovative and among his best (Drouin 1987:42–44). Réaumur wrote that John Ray had found only five species of ant in England; Réaumur said (without naming them) that France had all five plus many more species. Réaumur’s approach of concentrating on conspicuous species did allow him to make some generalizations. There were no known species of solitary ants, like the solitary bee and wasp species (still true when Wheeler commented on this). Some ant species have permanent abodes and other species have only temporary abodes. Even those with permanent abodes abandon it when a drought or excessive rain makes it unsuitable. Some species build formicaries (ant hills) with little pieces of dead wood, others live in hollow trees, others burrow tunnels in the ground, and still others hide their formicary under rocks or flower pots (Réaumur 1926:135–140). He dismissed as folklore the ancient story of industrious ants storing up grain for the winter, because he had never discovered such stores when he excavated formicaries, and he even ran experiments with enclosed ants that were given grain and nothing else to eat; they starved (Réaumur 1926:147–149). Wheeler (1926:230, note 29) pointed out that Réaumur was correct about ants in northern France that hibernate, but there are species around the Mediterranean Sea that do store grain. In the country, the trees usually had lines of ants going up and down, and Réaumur found they usually did no harm, for they sought the excretions of aphids and scale insects. However, he discovered that a dark-brown moderate-size species did gnaw the flowers, buds, and young fruit of apricot trees. Sometimes different species, or different colonies of the same species, fight for possession of a tree (pp. 155–156). Ants like honey, and if they find egg cells of solitary bees with honey stored in them, they can force the female to abandon the site. He cited the French translation (1743) of Richard Bradley’s The Gentleman andGardener’s Kalendar on how to destroy ants that become pests: chop up an earthworm on a flat dish, place it near them, and when it is covered with ants they can be killed. Ants kill caterpillars placed on their formicary and sometimes also ones they encounter on elm trees. The best way to clean a skeleton is to bury the animal in a formicary. Several species of spider lay eggs on folded tree leaves, and the mother stays close by to protect them. Réaumur drove away a spider and placed the leaf with eggs on the ground, and in a few hours ants had eaten the eggs (pp. 157–159).
No one before Réaumur had reported on ants mating. Swammerdam had thought that all winged ants were male, but in September 1731 Réaumur saw flying swarms of insects, which he discovered were mating ants, male and female. He saw them, after mating, return to the formicary they had left. He realized that they only needed wings for mating and that they later shed them (Drouin 1987:39–42). However, a question he could not answer was whether ant colonies (Réaumur 1926:177)
Wheeler (1926:247, note 71) said both types of colony formation occur among different ant species. On 10 June 1720, Réaumur found a formicary that at night had all entrances except a small one stopped up; the others were opened in the morning (Réaumur 1926:213). He discovered that larvae and nymphs can only be found in formicaries during warm months, and that they are located more or less deeply within them according to the hour of day and the weather, and that workers stay busy moving them about. If the formicary is disturbed, workers quickly carry them to safety. Some species do not spin cocoons, but many do, and a larva completes a cocoon in about 29 hours. It soon metamorphoses and remains dormant one or two days before shedding its skin to become an adult. Formicaries normally increase in population, because ants are produced more rapidly than they die. This causes a constant enlargement of the formicary as long as it is practicable, but after that, a swarm probably leaves to make a new formicary. One can distinguish between a migrating colony and normal ant traffic to and fro, because a migrating colony goes in only one direction and carries its larvae and cocoons. Sometimes adults even carry other adults, in which case the pair lock mandibles; generally, larger ones carried smaller ones, and he suspected that the ants being carried were males (Réaumur 1926:189–194). Réaumur (1926:187–188) cited the remarkable Metamorphosis insectorum Surinamensium (1705, 1980; see Bodenheimer 1928–1929, I:401–407, Rucker and Stearn 1982, Rice 1999:90–119), by the equally remarkable Maria Sibylla Merian (1674–1717), for her gorgeous color illustrations (Wettengl 1997), and account of tropical ants occasionally swarming into houses. People had learned to tolerate them, because they cleaned out the cockroaches and other insects and spiders before leaving. She also reported that leaf-cutting ants sometimes defoliate a tree. Some of them climb up and cut the leaves from the branches, and when they fall to the ground, others take them to the formicary, apparently as food for larvae. Later, Thomas Belt (1874:71–84) reported that the leaves were used within the formicary as compost on which to grow fungal food for both adults and larvae (Wheeler 1926:250–251, note 90). Réaumur’s natural history of insects was widely read and appreciated, and it inspired other naturalists to make similar studies. He carried on an extensive correspondence with some of them, and many of those letters are published. These are the most notable examples. Pierre Lyonet read Réaumur’s work and began his own investigations in 1736 on the anatomy of insects (Miall 1912:291–293, Van Seters 1962, Pierson 1973). In 1737 Charles Bonnet read Réaumur’s work and began a correspondence that resulted in his studies on parthenogenesis in aphids and other subjects (Miall 1912:284–291, Bodenheimer 1928–1929, I:476–486, Savioz 1940, Pilet 1970, Dawson 1987). In 1739 Abraham Trembley read Réaumur’s work; he began his famous investigations on hydra in June 1740 and reported his findings to Réaumur in October (Miall 1912:279–284, Trembley 1943, Baker 1952, 1976, de Beer 1960, Dawson 1987). Jacques François Artur, a physician in the French colony of Cayenne (French Guiana), began corresponding with Réaumur in 1741 and sent many observations that Réaumur used in his Memoires (Chaïa 1968). Charles de Geer was elected to the Swedish Academy of Sciences at age 19 in 1739, and he initiated his correspondence with Réaumur in 1744 (Landin 1972). De Geer so admired Réaumur that he gave his own seven-volume work (1752–1778) the same title as Réaumur’s. August Johann Roesel von Rosenhof was inspired by Maria Sybilla Merian’s book to study insects, but then turned to Réaumur’s work for scientific guidance (Miall 1912:293–303, Bodenheimer 1928–1929, I:361–367, Geus 1975); I am unaware of any correspondence between him and Réaumur. Literature cited Baker, J. R. 1952. Abraham Trembley of Geneva: scientist and philosopher, 1710–1784. Edward Arnold, London, UK. Baker, J. R. 1976. Abraham Trembley (1710–1784). Dictionary of Scientific Biography 13:457–458. Belt, T. 1874. The naturalist in Nicaragua: a narrative of a residence at the gold mines of Chontales; journeys in the savannahs and forests. Edward Bumpus, London, UK. Birembaut, A. 1958. La contribution de Réaumur à la thermométrie. Revue d’histoire des sciences et de leurs applications 11:302–329. Bodenheimer, F. S. 1928–1929. Materialien zur Geschichte der Entomologie bis Linné. Two volumes. Junk, Berlin, Germany. Bodenheimer, F. S. 1931. Zur Frühgeschichte der Erforschung des Insektenparasitismus. Archiv für die Geschichte der Mathematik und Natur Wissenschaften und der Technik 13:402–416. Bradley, R. 1721–1724. A general treatise of husbandry and gardening. Three volumes. J. Peele and T. Woodward, London, UK. Chaïa, J. 1968. Sur une correspondence inedited de Réaumur avec Artur, premier Médecin du Roy à Cayenne. Episteme 2:36–57, 121–138. Dawson, V. P. 1987. Nature’s enigma: the problem of the polyp in the letters of Bonnet, Trembley, and Réaumur. American Philosophical Society Memoirs 174:ix + 266 pages. De Beer, G. 1960. The sciences were never at war. [Letters in French with English translations.] Thomas Nelson and Sons, London, UK. Drouin, J.-M. 1987. Du terrain au laboratoire: Réaumur et l’histoire des fourmis. Aster number 5: Didactique et histoire des sciences. Pages 35–47. Drouin, J.-M. 1995. René-Antoine Ferchault de Réaumur: les curiosités d’un physician. Pages 197–209 in Adventures scientifiques: savants en Poitou-Charentes du XVIe au XXe siècle. Jean Dhombres, editor. Les editions de l’Actualité, Poitou-Charentes, France. Egerton, F. N. 1967. Leeuwenhoek as a founder of animal demography. Journal of the History of Biology 1:1–22. Egerton, F. N. 2005. A history of the ecological sciences, part 16: Robert Hooke and the Royal Society of London. ESA Bulletin 86:93–101. Egerton, F. N. 2006. A history of the ecological sciences, part 19: Leeuwenhoek’s microscopic natural history. ESA Bulletin 87:47–58. Evans, M. A., and H. E. Evans. 1970. William Morton Wheeler, biologist. Harvard University Press, Cambridge, Massachusetts, USA. Geus, A. 1975. August Johann Roesel von Rosenhof (1705–1759). Dictionary of Scientific Biography 11:502–503. Gough, J. B. 1975. René Antoine Ferchault de Réaumur (1683–1757). Dictionary of Scientific Biography 11:327–335. Grasse, P.-P. 1962. La vie et l’oeuvre de Réaumur (1683–1757). Preface. [Reprints articles of 1958 in Revue d’histoire des sciences et de leurs applications.] Presses Universitaires de France, Paris, France. Hooke, R. 1665. Micrographia: or some physiological descriptions of minute bodies Made by magnifying glasses, with observations and inquiries thereupon. Jo. Martyn and Ja. Allestry for the Royal Society of London, London, UK. Howard, L. O., H. G. Dyar, and F. O. Knab. 1912. The mosquitoes of North and Central America and the West Indies. Volume I: a general consideration of Mosquitoes, their habits, and their relations to the human species. Carnegie Institution of Washington, Washington, D.C., USA. Huxley, L. 1900. Life and letters of Thomas Henry Huxley. Two volumes. Macmillan, London, UK. Landin, B.-O. 1972. Charles de Geer (1720–1778). Dictionary of Scientific Biography V:328–329. Linnaeus, C. 1758. Systema naturae per regna tria naturae. Edition 10, Volume 1. Laurentii Salvii, Holmiae, Sweden. Merian, M. S. 1980. Metamorphosis insectorum Surinamensium. Miall, L. C. 1912. The early naturalists: their lives and work. Macmillan, London, UK. Middleton, W. E. K. 1966. A history of the thermometer and its use in meteorology. Johns Hopkins Press, Baltimore, Maryland, USA. Müller, G. H., and M. R. Wheeler. 1981. Misinterpretations of Réaumur’s description of small flies. Centaurus 25:319–327. Pierson, S. 1973. Pierre Lyonet (1706–1789). Dictionary of Scientific Biography 8:579– 580. Pilet, P. E. 1970. Charles Bonnet (1720–1793). Dictionary of Scientific Biography 2:286–287. Réaumur, R.-A. F. de. 1734–1742. Mémoires pour servir à l’histoire des insectes. Six volumes. Académie Royale des Sciences, Paris, France. Réaumur, R.-A. F. de. 1749. Art de faire éclorre et d’élever en tout saison des oiseaux Domestiques de toutes espèces. Two volumes. Imprimerie royale, Paris, France. Réaumur, R.-A. F. de. 1750. The art of hatching and bringing up domestic fowls. London, UK. Réaumur, R.-A. F. de. 1800. Short history of bees I. The natural history of bees . . . Printed for Vernor and Hood in the Poultry, by J. Cundee, London, UK. Réaumur, R.-A. F. de. 1926. The natural history of ants, from an unpublished manuscript. W. M. Wheeler, editor and translator. [Includes French text.] Knopf, New York, New York, USA. Reprinted 1977. Arno Press, New York, New York, USA. Réaumur, R.-A. F. de. 1939. Morceaux choisis. Jean Torlais, editor. Gallimard, Paris, France. Réaumur, R.-A. F. de. 1955. Histoire des scarabées. M. Caullery, introduction. Volume 11 of Encyclopédie Entomologique. Paul Lechevalier, Paris, France. Réaumur, R.-A. F. de. 1956. Memoirs on steel and iron. A. G. Sisco, translator. C. S. Smith, introduction and notes. University of Chicago Press, Chicago, Illinois, USA. Rice, T. 1999. Voyages of discovery: three centuries of natural history exploration. Natural History Museum, London, UK. Rostand, J. 1962a. Réaumur et les premiers essays de lethargie artificielle. Revue d’histoire des sciences et de leurs applications 15:69–71. Rostand, J. 1962b. Réaumur et la résistance des insects à la congélation. Revue d’histoire des sciences et de leurs applications 15:71–72. Rucker, E., and W. T. Stearn. 1982. Maria Sibylla Merian in Surinam: commentary to the facsimile edition of Metamorphosis insectorum Surinamensium (Amsterdam 1705). Pion, London, UK. Savioz, R. 1940. Un maître et un disciple au XVIIIe siècle (Charles Bonnet et Réaumur). Thalès 4:100–112. Taton, R. 1958. Réaumur mathematician. Revue d’histoire des sciences et de leurs applications 11:130–133. Théodoridès, J. 1959a. Réaumur (1683–1757) et les insects sociaux. Janus 48:62–76. Théodoridès, J. 1959b. Réaumur et la parasitologie. Biologie Médicale 48, numéro hors série:iii–xxiv. Théodoridès, J. 1968. Historique des connaissances scientifiques sur l’abeille. Pages 1–34 in Traité de biologie de l’abeille. R. Chauvin, editor. Masson, Paris, France. Torlais, J. 1961. Un esprit encyclopédique en dehors de “L’encyclopédie”: Réaumur. Blachard, Paris, France. Trembley, M., editor. 1943. Correspondance inedited entre Réaumur et Abraham Trembley. Georg, Geneva, Switzerland. Tuxen, S. L. 1973. Entomology systematizes and describes: 1700–1815. Pages 95–118 in R. F. Smith, T. E. Mittler and C. N. Smith, editors. History of entomology. Annual Reviews, Palo Alto, California, USA. Vallot, J. N. 1802. Concordance systématique, servant de table des matières à l’ouvrage de Réaumur intitulé Mémoires… Paris, France. Van Seters, W. H. 1962. Pierre Lyonet, 1706–1789: sa vie, ses collections de coquillages et de tableaux ses recherches entomologiques. Martinus Nijhoff, The Hague, The Netherlands. Wettengl, K., editor. 1997. Maria Sibylla Merian, 1647–1717: Künstlerin und Naturforscherin. Gerd Hatje, Frankfurt am Main, Germany. Wheeler, W. M. 1926. Introduction, annotations and bibliography. In R.-A.F.de Réaumur 1926. Knopf, New York, New York, USA. Acknowledgments For their assistance I thank Bénédict Bilodeau, Centre Alexandre Koyré, Paris; Jean-Marc Drouin, Muséum National d’Histoire Naturelle, Paris; and Anne-Marie Drouin-Hans, Université de Bourgogne. Frank N. Egerton E-mail: [email protected] |
Commentary |
SEEDS of a New Millenium |
—Henry David Thoreau Ideas that each of us nurtured in private seemed to blossom when we shared them at a recent leadership workshop held in Phoenix, Arizona by the Strategies for Ecology, Education, Development and Sustainability (SEEDS) Program. We are 12 young scientists, representing three cohorts of the Ecological Society of America’s SEEDS Program, who have been awarded Undergraduate Research Fellowships in 2004–2007. We were chosen from America’s minority and immigrant populations. Some of us represent Native Americans, including Hawai'ians and the Lakota, Mandan, Hidatsa, and Arikara Nations. Some of our parents or we ourselves come from other countries, including Mexico, Puerto Rico, Honduras, Peru, Africa, and China. More than a nod to political correctness and affirmative action, we embody the diversity that ESA seeks, a diversity that is necessary for the advancement of science and society. Today, we share our thoughts with those who set the agenda for the field we are now part of. We believe it is imperative to expand the focus of ecology and understand the importance of hard science. We are global citizens who feel a deep obligation toward serving our communities. As emerging ecologists, the inheritors of ESA, we wish to express our views and concerns regarding the future of this field. Currently African Americans, Hispanics, and Native Americans make up nearly 25% of the national population, yet they receive only 13% of all United States science and engineering bachelor’s degrees, and 7% of all science doctoral degrees (Mojica Rey 2001). Similarly, African Americans, Hispanics, and Native Americans compose <5% of ESA’s total membership (ESA 2005). ESA realized the need to increase the presence of underrepresented ethnicities in the field of ecological research by creating the SEEDS Program. The mission of SEEDS is to promote opportunities, to spark and nurture the interest of underrepresented students in the science of ecology. SEEDS values cultural diversity in ecology by viewing it as a crucial tool to expand global environmental awareness, advance science, and increase community development. The SEEDS Program has given minority students the chance to learn and apply rigorous Western Science through practical hands-on use of the scientific method, without being forced to deny or forsake the wisdom that is inherent and embedded in their cultures. We must remain true to both science and our cultures while being careful to distinguish the similarities and differences in these two realms. Cultural wisdom goes beyond the traditional science methodology by including not only the how or why, but also purpose of understanding the natural world. The SEEDS program recognizes our unique perspectives and constantly encourages us with support and opportunities. SEEDS has given us the chance to conduct independent ecological research projects through the SEEDS Undergraduate Research Fellowship. Through experiencing what graduate students and career ecologists do, we are beginning to understand and visualize what it takes to pursue an ecological profession. The teachings that we receive from this program and our mentors are priceless. The support of ESA and SEEDS has maximized our learning potential by also enabling us to participate in other SEEDS activities: taking ecological field trips, attending and presenting at the ESA Annual Meetings, networking with other ecologists, and often participating in our local campus SEEDS Chapters. All of us were introduced to SEEDS differently, either through faculty members, mentors, and/or SEEDS Chapters. Prior to SEEDS many of us did not know what the field of ecology entailed. We all possessed a sincere interest in environmental science and nature, but we did not know where our passions lay or how to pursue them. SEEDS has shown us the many different realms of ecology, allowing us to find an ecological discipline that is close to our personal interests. Our interests encompass a variety of areas: biogeochemistry, urban ecology, rangeland ecology, tropical ecology, Northern Plains ecology, agro-forestry, marine ecology, and population ecology. SEEDS students, with our diverse cultural, geographic, and disciplinary backgrounds, are a vivid message to the ecological community that diversity can greatly strengthen the profession. SEEDS has enhanced multilingual and multicultural relations by uniting diverse students who are deeply committed to ecology, equity, and culture. We have made lifelong friendships, and support each other, regardless of how many miles lie between us. SEEDS is a family that makes us not only want to become ESA members, but also active participants in shaping the future of the organization. The chance to meet and collaborate with students and scholars from different ethnic backgrounds has given us a positive and optimistic outlook on science. We believe that the future of ecological research lies in collaboration across boundary lines: geographical and intellectual. Borrowing tools from other disciplines and incorporating different methodological and theoretical perspectives will make ecology prepared for future challenges. SEEDS has opened our eyes and minds to a whole new world of possibilities—possibilities we would never imagined had we not found SEEDS, or maybe if SEEDS hadn’t found us. Studying ecology has helped us understand the world’s complexity. However, the lack of pristine ecosystems has affected our paradigm in research, leading us to focus on restoration, preservation, and urban ecosystems. To address the environmental problems we see in the world and in our communities, we have a broad view on research questions, perspectives on research, and approaches to solutions, such as the combination of science and traditional ecological knowledge. We wish to conduct scientific research that is credible in the scientific community, but that can also be applied in real-world settings. As scientists we have the knowledge of how systems may function, and we believe that with knowledge comes the responsibility to act. Within the scientific community, professionals have collaborated and are sharing information with each other, but now we must take the next step forward by ensuring it is passed on to society and applied for the benefit of everyone. As emerging young scientists of the new millennium we understand and admire the goals of ESA. Those related to diversifying and communicating science include:
In order to fulfill these goals, ESA members and all ecologists should become more involved in increasing diversity in ecology, educating communities, and informing policy makers. During our undergraduate careers, we already are fulfilling ESA’s goals and strengthening the science of ecology by asking broad ecological questions, doing ecological research in different international locations, and actively using our ecological knowledge to influence society and the public. For example, a fellow at the University of Texas El Paso (UTEP) directs, designs, and participates in restoration and outreach projects that expose grade school students to the field of ecology, and strengthens their abilities in science for the annual Texas mandated test. At Occidental College in Los Angeles, a SEEDS fellow founded and directs the Scientific Scholars Achievement Program (SSAP). SSAP helps students from underrepresented groups in under-funded public high schools successfully pursue their scientific passions by offering mentoring/tutoring sessions and a strong supportive community. Another SEEDS fellow at UTEP is president of the University’s Society for the Advancement of Chicanos and Native Americans in Science (SACNAS) chapter, and is actively involved in building a science community by creating student–mentor relationships, journal reading clubs, and tutoring opportunities. At United Tribes Technical College in North Dakota, a SEEDS fellow tutors other students in math and science, and was also recently awarded the honor of representing the American Indians in Higher Education Consortium (AIHEC), as Ms. AIHEC. We also have members who are presidents of their local ESA SEEDS chapters and have recruited many students into ecology on their own campuses. Due to the nature of campus life, one student's achievements instantly become motivation and curiosity builders for other students. Just being part of an innovative program like SEEDS makes each and every one of us a spokesperson for the ESA wherever we bring our science. The cultural diversity within our group helps us gain awareness of different perspectives on life, science, and community development. As large as the field of ecology can appear to be, it can only go as far as the scientists that compose it. We believe ESA members and ecologists should become more involved in outreach programs for people of all ages. At this time, with much science in the news (e.g., global climate change, diseases, pollution, extinction of species, etc.) all the world’s people, starting at an early age, should be able to understand science, and how science can help them. Some concrete suggestions we have for ecologists are the following:
Through our exposure to ecology and to each other we have concluded that science does not reach its full potential until it has been applied to real-world issues. We feel ecology must include the transmission of scientific knowledge back to the people who can use it on a daily basis to improve their lives. Through this empowerment, individuals can apply scientific knowledge that can help them make informed decisions that will affect the rest of the world. It is our obligation as educated scientists and citizens to use what we have learned to make a difference in society. It is imperative that we work with educators in other disciplines and with members of all segments of our communities. As ecological issues become increasingly pressing, it is time for us to build a foundation of knowledge and methods that will protect our global environment, making the earth a better place for us and the generations to come. Literature cited ESA. 2005. Ecological Society of America annual report. Ecological Society of America, Washington, D.C., USA. Mojica Rey, C. 2001. Making room for diversity makes sense. Science 293:1611–1612. SEEDS Fellows
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DEPARTMENTS |
LINK: A Land Conservation Decision Support ToolIntroduction Public and private land managers are in need of tools that ably incorporate landscape, species, and habitat relations into their conservation planning processes. A variety of geographic information system (GIS) applications facilitating the spatial aspects of land management are currently available and growing in number (e.g., Mladenoff et al. 1996, Andelman et al. 1999, Pattison et al. 2004, Carr and Zwick 2005, Fitzhugh 2005). Conservation agencies are increasingly taking advantage of these GIS capabilities by incorporating them into their operations (Bettinger 1999, Green 2001, Jansen et al. 2002). Despite these developments, there are few spatial decision support systems providing a link between a broad array of species and their habitat (Nelson et al. 2005), constraining integrated regional species management to a series of inchoate processes. The Upper Midwest Environmental Sciences Center has a long history of developing decision support tools that add rigor to environmental management (DeHaan et al. 2000, Fox et al. 2003, Nelson et al. 2005); LINK is the latest product in this history of software development. Geographic information system tool linking species to habitat LINK is a set of ArcGIS tools from the Environmental Systems Research Institute (ESRI, Redlands, California, USA) designed to map species–habitat patterns across a landscape. Any species that can be scored against land cover can be modeled with this tool, including birds, herpetiles, and mammals. Similar to previous tools developed at the Upper Midwest Environmental Sciences Center (Fox et al. 2003), LINK uses species–habitat matrices to model potential species habitat and habitat diversity. These species–habitat matrices are user-contributed, and typically are created through expert opinion regarding species–habitat associations. What sets LINK apart from its predecessors, such as the Comprehensive Conservation Planning GIS Tool ‹http://www.umesc.usgs.gov/management/dss/ gis_tools_for_conservation_planning.html› is that it relates these user-contributed species–habitat matrices to raster data sources such as land cover. Raster data allows LINK to model habitat associations over a much larger spatial extent (e.g., counties, states/provinces, regions) than its vector-based antecedents. LINK’s main purpose is to make comparisons of conservation potential between management units and the surrounding landscape. It does this by summarizing potential species richness, mean potential species occurrence, and habitat diversity for any combination of taxa identified by the user. Three main data sources are needed to run a LINK query: a species–habitat matrix, source layers, and (optionally) zonal layers (Fig. 1).
A species–habitat matrix relates, for each habitat type within the raster source layer, a score representing species–habitat suitability (Fig. 2). Species habitat suitability ranges from 0 (little to no value as habitat) to 100 (prime habitat). A Relationship Manager allows the user to create an association between matrices and source layers, and between source layers and zonal layers.
Fig. 2. A species × habitat matrix represents the association of species to habitat. In this example the source layer habitat is based upon a land cover classification.
The source layer is a raster spatial data layer containing landscape information for species listed in the matrix. The source layer must be an integer ESRI Grid (e.g., National Land Cover Dataset 1992 ‹http://landcover.usgs.gov/natllandcover.asp›, Land Cover of Canada 1995 ‹http://ccrs.nrcan.gc.ca/optic/coarse/boreal/land_e.php›, CORINE Land Cover Database ‹http://terrestrial.eionet.eu.int/CLC2000›). A zonal layer is a vector (polygonal) spatial data layer used to divide the landscape into units of comparison and must be in an ESRI Shapefile format. Bird Conservation Regions, counties or townships within a state or province, or management units within a refuge or conservation area, are examples of appropriate zonal layers. Queries LINK relates values contained in the species–habitat matrix to the source layer, allowing the generation of several indices of potential habitat (Table 1). These indices include mean potential species occurrence and potential species richness, and may be calculated for an individual species or a group of species. If the user chooses, the program can summarize these indices for each zone within a zonal layer. A zonal layer is not required to run a LINK query, but summarizing habitat information by zone helps to illustrate the distribution of habitats across a region; the use of a zonal layer provides a unit-by-unit evaluation of potential habitat within the area of interest.
Table 1. Examples of tabular, charted, and mapped output available from LINK. Limiting avian species predictions to range boundaries Due to interest within the Fish and Wildlife Service Migratory Birds Program, we developed an extension to the LINK tool that incorporates bird species ranges into models of habitat suitability (Fig. 3); in this way, avian species are modeled only for those areas in their range in which they are believed to occur. This range limitation emphasizes that the LINK tool models potential rather than occupied habitat. As part of this extension, we incorporated ranges for all birds in the Western Hemisphere, as provided in the collection of digital distribution maps by NatureServe (Ridgely et al. 2003) and the Breeding Bird Survey (Sauer 2004). The NatureServe ranges act as a 0/1 binary mask of the predictions, allowing predicted habitat to show only for areas within the range of the species, whereas the Breeding Bird Survey ranges act as weights to the predictions, weighing predicted species occurrence by the scaled species predicted abundance.
An example implementation of LINK: priority birds in Minnesota Currently, the tool is loaded with source layers (National Land Cover Dataset 1992), various zonal layers, and a species–habitat matrix developed for birds of the Prairie–Hardwood Transition Bird Conservation Region. It is easy, however, for users to insert their own species–habitat matrices, source layers, and zonal layers into LINK using the import tool developed for such a purpose. As an example of how LINK may be used, we calculated mean potential species occurrence and potential species richness for all regularly breeding United States Fish and Wildlife Service Priority 1 bird species in Minnesota (Table 2), summarized the results by county (zonal layer), and weighted the summary by the Breeding Bird Survey range maps (Fig. 4).
This summary, which took approximately 10 minutes of processing time, suggests that the priority birds as a whole in Minnesota are concentrated in a band in the north-central portion of the state. This area consists of a transition between the boreal hardwood and prairie–hardwood ecoregions, a zone possessing the mix of habitats that these ecologically disparate species require. Inferences for individual species suggest Black-billed Cuckoo, Upland Sandpiper, Golden-winged Warbler, and Wood Thrush exhibit the greatest potential occurrence within the state and are predicted to occur over a fifth of the area. Conversely, Acadian Flycatcher and Peregrine Falcon are expected to occur on <1% of the area of the state. With this information, management authorities may now devote their conservation efforts to a particular subset of counties as opposed to the entire set of counties within the state, concentrating scarce conservation funds on focused areas. Summary LINK is a spatial decision support system allowing natural resource managers to draw inferences regarding the combined distribution of species over large areas. LINK is designed to operate within the ESRI ArcGIS 9.X platform with the Spatial Analyst extension, uses raster-based source layers, is most applicable to relatively large geographic areas (e.g., states, counties, regions), and produces output depicting mean potential species occurrence and potential species richness for each grid cell within the mapped extent, or summarized per zone or management unit. Any species that can be scored against habitat can be modeled with this tool. The software comes with an extensive help section. LINK is most useful as a tool to generate and test quickly hypotheses regarding the potential conservation value of particular habitats or particular zones within a broader geospatial extent. It may be especially useful in a workshop setting attended by a group of planners, biologists, and decision makers, as the speed of the tool makes it amenable to answering questions of potential focus areas on-the-fly. It is not meant to be a substitute for complex statistical single-species models, especially those designed to evaluate habitat quality or predict the effect of specific management practices. Users should understand that the validity of the LINK products are directly constrained by (1) the accuracy, resolution, and classification categories of the geospatial data set (land cover), and (2) the quality and validity of the user-supplied habitat-association matrix. Given those constraints, however, LINK is potentially a useful tool filling the void between geospatial prioritizing guesswork and expensive modeling processes that may or may not produce more accurate results. It is also very useful in the way it can be used to summarize habitat value across multiple species, priority species, or other focus groups. Because it weights the potential value of habitats for each species in the species–habitat matrix, LINK is more informative than simple presence/absence models applied to broad habitat categories, such as those represented by the National Land Cover Dataset. Interested parties may download this tool, along with demonstration data and a user’s help manual, from the Internet at ‹http://www.umesc.usgs.gov/management/dss/bird_conservation_tools_link.html› or by sending an e-mail to [email protected], with your shipping address and the versions of ArcGIS (8.x or 9.x) and Windows operating system that you are using. Acknowledgments Data provided by NatureServe in collaboration with R. Ridgely, J. Zook, The Nature Conservancy–Migratory Bird Program, Conservation International–CABS, World Wildlife Fund–US, and Environment Canada–WILDSPACE. This manuscript was improved by comments from three anonymous reviewers and T. Will. Literature Cited Andelman, S., I. Ball, F. Davis, and D. Stoms. 1999. SITES V 1.0: an analytical toolbox for designing ecoregional conservation portfolios. The Nature Conservancy, Alexandria, Virginia, USA. Bettinger, P. 1999. Distributing GIS capabilities to forestry field offices. Journal of Forestry 97:22 -26. Carr, M., and P. Zwick. 2005. Using GIS suitability analysis to identify future land use conflicts in North Central Florida. Journal of Conservation Planning 1. ‹http://www.journalconsplanning.org/2005/volume1/issue1/carr/manuscript.pdf› DeHaan, H. C., T. J. Fox, C. E. Korschgen, C. H. Theiling, and J. J. Rohweder. 2000. Habitat needs assessment GIS query tool for the upper Mississippi River system: user’s manual. Prepared for U.S. Army Corps of Engineers, St. Louis, Missouri, USA. FitzHugh, T. W. 2005. GIS tools for freshwater biodiversity conservation planning. Transactions in GIS 9:247 -263. Fox, T. J., J. J. Rohweder, K. P. Kenow, C. E. Korschgen, and H. C. DeHaan. 2003. Geographic information system tools for conservation planning: user’s manual. U.S. Geological Survey, Biological Resources Discipline Information and Technology Report USGS/BRD/ITR—2003–0005. Green, D. S. 2001. GIS Strategic Plan for managing Geographic Information Systems (GIS) and spatial data in the U. S. Fish and Wildlife Service, with the focus on FY2001–2004. U.S. Fish and Wildlife Service, Arlington, Virginia, USA. ‹http://www.fws.gov/data/gisplan_fws.html› Jansen, M., M. Judas, and J. Saborowski, editors. 2002. Spatial modelling in forest ecology and management: a case study. Springer Verlag, Berlin, Germany. Mladenoff, J. D., G. E. Host, J. Beoder, and T. R. Crow. 1996. LANDIS: a spatial model of forest landscape disturbance succession and management. Pages 175 -179 in M. F. Goodchild, L. T. Steyaert, B. O. Park, C. Johnston, D. Maidment, M. Crane, and S. Glendinning, editors. GIS and environmental modeling: progress and research issues. GIS World, Fort Collins, Colorado, USA. Nelson, J. C., T. J. Fox, M. G. Knutson, J. R. Sauer, and W. E. Thogmartin. 2005. Regional bird conservation internet mapping tool takes flight with GIS. ArcNews 27:21. ‹http://www.esri.com/news/arcnews/summer05articles/regional-bird.html› Pattison, D., D. dosReis, and S. Hamilton. 2004. An inventory of GIS-based decision-support tools for MPAs. Prepared by the National Marine Protected Areas Center in cooperation with the National Oceanic and Atmospheric Administration Coastal Services Center. ‹http://www.mpa.gov/virtual_library/Publications/FINAL_Decision%20Sup%20Rpt.pdf› Ridgely, R .S., T. F. Allnutt, T. Brooks, D. K. McNicol, D. W. Mehlman, B. E. Young, and J. R. Zook. 2003. Digital Distribution Maps of the Birds of the Western Hemisphere, version 1.0. NatureServe, Arlington, Virginia, USA. URL: http://www.natureserve.org/getData/birdMaps.jsp (for version 2.1 of the bird distribution maps). Sauer, J. R. 2004. The North American Breeding Bird Survey, Results and Analysis 1966 -2003. Version 2004.1. Patuxent Wildlife Research Center, Laurel, Maryland, USA. URL: ‹http://www.mbr-pwrc.usgs.gov/bbs/geographic_information/geographic_information_products_.htm› Wayne E. Thogmartin, Timothy J. Fox, Jason J. Rohweder, and Melinda G. Knutson1 Tom Will 1 U.S. Fish and Wildlife Service |
Southeastern Chapter Newsletter
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Elsie Quarterman-Catherine Keever Award for best student poster Undergraduate and graduate students were eligible for this award and had to be the sole or senior author on a poster clearly dealing with an ecological topic and representing a completed research project. Angela Scarborough, Central Missouri State University, earned the 2006 Quarterman-Keever Award for her poster “Tree canopy myxomycetes: patterns and distributions.” |
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Eugene P. Odum Award for Best Student Paper Daniel Johnson, Wake Forest University, earned the 2006 Odum Award for his paper “Effects of cloud immersion on understory light environment and photosynthesis in the southern Appalachian Mountains” (co-authored with William Smith). Like the Quarterman-Keever Award, undergraduate and graduate students were eligible to compete and the student had to be the sole or senior author on a paper presentation clearly dealing with an ecological topic and representing a completed research project. |
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2006 ESA Meeting Our chapter's Brown Bag Lunch at the ESA Meeting in Memphis, Tennessee, will be Wednesday, 9 August 2006, noon –1:00 pm. Vegetation SectionThe Vegetation Section of ESA will have its meeting and mixer Monday, 7 August, 6:30-8:00 pm. Symposia organized by Chapter members Cliff Huff organized the symposium, “Exchange between channel and floodplain in large rivers,” with colleague Jack Grubaugh. Scott Franklin, together with Vladimir Douhovnikoff and Paul Gagnon, arranged the symposium, “Plant clonal growth—ecological implications.” Please check the meeting program for times and locations of these symposia. Keeping in touch Check the Chapter Home page: ‹http://www.auburn.edu/seesa/› for updates and additional information. Join the Southeastern Chapter of ESA LISTSERVER. To join the listserver, send a message to ‹[email protected]› with “subscribe scesa” in the body of the message. Please send news or announcements to ‹[email protected]› for distribution to the listserver, or to ‹[email protected]› for inclusion in the next quarterly newsletter. Respectfully submitted, |
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