2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | NUTRIENT EXCRETION BY STREAM FISH IN BRAZIL’S ATLANTIC RAINFOREST: TESTING ECOLOGICAL THEORIES | Virtual Platform
NUTRIENT EXCRETION BY STREAM FISH IN BRAZIL’S ATLANTIC RAINFOREST: TESTING ECOLOGICAL THEORIES
Recent discussions of the factors regulating nutrient excretion by fish have focused on predictions from Ecological Stoichiometry (ES) and the Metabolic Theory of Ecology (MTE). ES posits that imbalances between the composition of the diet and body tissues should determine nutrient excretion rates. Whereas, MTE states that metabolism, mostly influenced by body size and temperature, are the primary controls on nutrient excretion. Each framework has been supported by data, but they are rarely tested together. In this study, we measured excretion rates of nitrogen (NH4) and phosphorus (SRP), body N:P stoichiometry, body size, and temperature for 12 species of fish from an Atlantic rainforest stream in Brazil. We fitted 8 separate models reflecting different combinations of ES (body N:P, armor classification, and feeding guild) and MTE (body size, temperature) variables. For both N and P excretion, only body size was included in the best model (scalling coefficient of 0.55 for N and 0.64 for P). Therefore, we conclude that the ES framework has relatively little predictable effect on nutrient excretion compared to the scaling of metabolism with body size.
- Stoichiometry
- Tropical
- Stream
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Presenters/Authors
Priscila Cunha
(), Universidade do Estado do Rio de Janeiro, priscilacunhaoli@gmail.com;
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Peter B. McIntyre
(), Cornell University, pmcintyre777@gmail.com;
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Vinicius Neres-Lima
(), Universidade do Estado do Rio de Janeiro, vinicius.lima.eco@gmail.com;
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Eugenia Zandona
(), Universidade do Estado do Rio de Janeiro, eugenia.zandona@gmail.com;
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