2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 9:30 AM - 9:45 AM | NITROGEN AND PHOSPHORUS LIMITATION OF BENTHIC INVERTEBRATES IN GREEN VERSUS BROWN FOOD WEBS - A META-ANALYSIS | 306B
NITROGEN AND PHOSPHORUS LIMITATION OF BENTHIC INVERTEBRATES IN GREEN VERSUS BROWN FOOD WEBS - A META-ANALYSIS
Resource nitrogen:carbon (N:C) and phosphorus:carbon (P:C) ratios are often considered limiting to consumer growth across ecosystems. However, because tests of this generalization are mostly from individual species, the breadth and strength of limitation across diverse taxa remains unclear. We conducted a meta-analysis of feeding studies to assess resource N:C and P:C effects on growth, consumption, and excretion rates across benthic invertebrates. From n=15-54 datasets we calculated Pearson’s r and used weighted mixed effects models to compare effect sizes between herbivorous and detritivorous taxa. Detritivores exhibited a positive growth response to resource N:C (P<0.001) and P:C (P<0.01), whereas herbivores exhibited positive responses that did not differ from zero. In their consumption response to N:C and P:C, detritivores consistently responded positively whereas herbivores responded negatively (P<0.05). Nitrogen excretion rates did not respond to N:C among either trophic group, but herbivore P excretion rates responded positively to P:C, a greater response than detritivores’ (P<0.05). Our results support broad N- and P-limited consumer growth in benthic systems, yet different mechanistic responses between trophic groups, possibly due to contrasting quality of detrital versus autotrophic C.
- C03 Invertebrates
- C31 Organic Matter Processing
- S19 Elements and energy as fundamental currencies of nature: using ecological stoichiometry as a tool to advance the sustainability of freshwater ecosystems
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Presenters/Authors
Halvor Halvorson
(), University of Central Arkansas, hhalvorson@uca.edu;
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Michelle Evans-White
(), University of Arkansas, mevanswh@uark.edu;
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