Ecological Archives A021-058-A3

Anna M. Schotthoefer, Jason R. Rohr, Rebecca A. Cole, Anson V. Koehler, Catherine M. Johnson, Lucinda B. Johnson, and Val R. Beasley. 2011. Effects of wetland vs. landscape variables on parasite communities of Rana pipiens: links to anthropogenic factors. Ecological Applications 21:1257–1271.

Appendix C (TABLE C1). Descriptive statistics for the explanatory variables for the 18 surveyed wetlands included in the analyses.

Variable name Definition Mean S.D. Range
Wetland variables
FROGS No. of frog and toad species 4.4 1.69 1–7
FWGS No. of freshwater gastropod species 3.3 1.53 2–7
NPLAN Abundance of Planorbella snails (per person search hour) 17.1 33.74 0–140
VEGS No. of plant species 13.9 6.54 5–27
%TYPH Line transects composed of Typha spp. (%) 23.2 32.72 0–98.0
%PHAL Line transects composed of Phalaris spp. (%) 16.7 25.53 0–80.5
SOILOM Organic matter of soil samples (%) 10.7 7.13 3–33.1
SUMATRAZ Sum of atrazine and desethylatrazine (ppb) detected in water 0.18 0.15 0–0.59
SUMPAH Sum of naphthalene and phenanthrene (ppb) detected in water 0.48 0.54 0.08–1.8
MAXN Maximum nitrate detected in water (ppm) 3.1 5.56 0.05–23.8
MAXP Maximum phosphate detected in water (ppm) 0.61 0.85 0.05–3.5
Local variables
DISTAG Distance to nearest agriculture patch (m) 91.7 149.75 10–600
DISTFOR Distance to nearest forest patch (m) 80.6 127.21 10–400
DISTRLD Distance to nearest low density residential area (m) 288.9 462.08 10–2000
DISTOW Distance to open water patch (m) 275.0 189.62 50–700
DISTWW Distance to woody wetland patch (m) 482.8 483.14 10–2000
FORLD-1k Land composed of forest (%) 14.6 7.12 3.4–28.1
FORPD-1k Patch density of forest (per km2) 12.0 3.51 5.8–18.5
WWLPI-1k Land comprised of largest patch of woody wetland (%) 1.6 1.66 0–6.5
WWMNN-1k Mean distances between patches of woody wetland (m) 218.8 179.02 0–572.6
OWMPS-1k Mean patch size of open water (km2) 3.4 7.27 0.14–32.1
PWLD-1k Land composed of palustrine-emergent wetland (%) 11.3 7.59 2.2–33.3
AGLD-1k Land composed of agriculture (%) 28.9 12.19 7.8–45.9
Regional variables
FORLD-10k Land composed of forest (%) 14.1 5.83 5.7–25.5
WWPD-10k Patch density of woody wetland (per km2) 1.6 0.76 0.58–3.3
WWLPI-10k Land comprised of largest patch of woody wetland (%) 0.33 0.35 0.10–1.3
WWMNN-10k Mean distances between patches of woody wetland (m) 200.9 67.76 100.6–354.2
OWMPS-10k Mean patch size of open water (km2) 4.9 3.43 1.6–12.4
PWLD-10k Land composed of palustrine-emergent wetland (%) 10.9 1.17 9.3–13.7
AGLD-10k Land composed of agriculture (%) 33.2 8.53 17.2–45.9
AGPD-10k Patch density of agriculture (per km2) 7.6 3.92 4.6–21.1
AGLPI-10k Land comprised of largest patch of agriculture (%) 14.4 11.54 0.62–24.1

LITERATURE CITED

Vogelmann, J. E., S. M. Howard, L. Yang, C. R. Larson, B. K. Wylie, and N. Van Driel. 2001. Completion of the 1990s National Land Cover dataset for the conterminous United States from Landsat Thematic Mapper data and ancillary data sources. Photogrammetric Engineering and Remote Sensing 67:650–684.


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