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130394 https://hdl.handle.net/2286/R.I.30109 <p>Moody, Eric K., Corman, Jessica R., Elser, James J., &amp; Sabo, John L. (2015). Diet composition affects the rate and N:P ratio of fish excretion. FRESHWATER BIOLOGY, 60(3), 456-465. http://dx.doi.org/10.1111/fwb.12500</p> 10.1111/fwb.12500 0046-5070 1365-2427 http://rightsstatements.org/vocab/InC/1.0/ 2015-03-01 2016-03-01T12:26:05 26 pages eng Moody, Eric Corman, Jessica Elser, James Sabo, John College of Liberal Arts and Sciences School of Life Sciences Julie Ann Wrigley Global Institute of Sustainability This is the peer reviewed version of the article, which has been published in final form at http://dx.doi.org/10.1111/fwb.12500 <p>Nutrient recycling by fish can be an important part of nutrient cycles in both freshwater and marine ecosystems. As a result, understanding the mechanisms that influence excretion elemental ratios of fish is of great importance to a complete understanding of aquatic nutrient cycles. As fish consume a wide range of diets that differ in elemental composition, stoichiometric theory can inform predictions about dietary effects on excretion ratios.<br /> We conducted a meta-analysis to test the effects of diet elemental composition on consumption and nutrient excretion by fish. We examined the relationship between consumption rate and diet N : P across all laboratory studies and calculated effect sizes for each excretion metric to test for significant effects.<br /> Consumption rate of N, but not P, was significantly negatively affected by diet N : P. Effect sizes of diet elemental composition on consumption-specific excretion N, P and N : P in laboratory studies were all significantly different from 0, but effect size for raw excretion N : P was not significantly different from zero in laboratory or field surveys.<br /> Our results highlight the importance of having a mechanistic understanding of the drivers of consumer excretion rates and ratios. We suggest that more research is needed on how consumption and assimilation efficiency vary with N : P and in natural ecosystems in order to further understand mechanistic processes in consumer-driven nutrient recycling.</p> Text Diet Composition Affects the Rate and N:P Ratio of Fish Excretion