Ecological Archives A021-009-A4

Annika W. Walters and David M. Post. 2011. How low can you go? Impacts of a low-flow disturbance on aquatic insect communities. Ecological Applications 20:163–174.

Appendix D (TABLE D1). Difference analysis results for insect biomass.1

  2005 2006 2007
Community metrics
Total biomass (mg) 0.06 0.76 0.02
Family richness 0.29 0.10 0.19
Family diversity 0.69 0.30 0.94
Family dominance 0.43 0.90 0.32
Functional feeding group biomass
Collector-filterer 0.003 0.84 0.04
Collector-gatherer 0.02 0.45 0.04
Scraper 0.11 0.30 0.14
Shredder 0.43 0.29 0.14
Predator 0.65 0.93 0.24
Family biomass
Aeshnidae 0.75 0.09 0.09
Baetidae 0.07 0.09 0.91
Chironomidae 0.10 0.98 0.16
Chloroperlidae 0.47 0.92 0.08
Corydalidae 0.80 0.52 0.45
Elmidae (adult) 0.49 0.96 0.11
Elmidae (larvae) 0.04 0.18 0.40
Ephemerellidae 0.91 0.21 0.17
Gomphidae 0.12 0.89 0.26
Heptageniidae 0.14 0.76 0.15
Hydropsychidae 0.39 0.59 0.19
Lepidostomatidae 0.84 --- 0.13
Leptophlebiidae 0.22 0.80 0.03
Leuctridae 0.67 0.91 0.23
Nemouridae --- --- 0.07
Peltoperlidae --- 0.42 ---
Perlidae 0.04 0.25 0.35
Philopotamidae 0.60 0.57 0.64
Polycentropodidae 0.80 0.26 0.82
Psephenidae 0.90 0.89 0.17
Rhyacophilidae 0.68 0.22 0.54
Sialidae 0.18 0.12 0.16
Tipulidae 0.01 0.59 0.16
Veliidae 0.92 --- 0.30

1The P values for the time × treatment interaction in ANOVAs comparing differences in insect community metrics, functional feeding group biomass, and family biomass between diverted and undiverted streams before (May) and after (August) water diversion. In 2005 there are 2 diverted and 4 undiverted streams and in 2006 and 2007 there are three of each. P values that are significant at the 0.05 level are in bold, no P value is reported if the sample size was insufficient to run the analysis.


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