Variation Among Fish Species in the Stoichiometry of Nutrient Excretion

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Title:	Variation Among Fish Species in the Stoichiometry of Nutrient Excretion
Author:	Torres, Lisette E.
Description:	This study investigates how nutrient cycling rates and ratios vary among fish species and with body size, and how they are related to body nutrient contents according to predictions of ecological stoichiometry. Nutrient excretion rates and body nutrient contents of eight fish species in four families were estimated in a hypereutrophic reservoir. As predicted by allometry, per capita nitrogen and phosphorus excretion rates increased and mass-specific excretion rates decreased, with increasing mass. Body phosphorus content was correlated with body mass, but this relationship varied among species. In accordance with stoichiometric predictions, species with low body phosphorus excreted more phosphorus than those with high body phosphorus. However, this relationship may be more of a function of food nutrient content than the nutrient content of the consumer. These results suggest that stoichiometry can provide a framework for variation among species in nutrient cycling and for evaluating the ecosystem consequences of biodiversity loss.
Permanent Link:	http://rave.ohiolink.edu/etdc/view?acc_num=miami1123178303 http://hdl.handle.net/2374.OX/18983
Date:	2005

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Now showing item 1187 of 1238