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Ecology

Title:		Eutrophication induces shifts in the trophic position of invertebrates in aquatic food webs
Author(s):		van der Lee GH; Vonk JA; Verdonschot RCM; Kraak MHS; Verdonschot PFM; Huisman J;
Address:		"Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94240, Amsterdam, 1090 GE, The Netherlands. Wageningen Environmental Research, Wageningen UR, P.O. Box 47, Wageningen, 6700 AA, The Netherlands"
Journal Title:		Ecology
Year:		2021
Volume:		20210213
Issue:		3
Page Number:		e03275 -
DOI:		10.1002/ecy.3275
ISSN/ISBN:		1939-9170 (Electronic) 0012-9658 (Print) 0012-9658 (Linking)
Abstract:		"Changes in the ecological stoichiometry of primary producers may have considerable implications for energy and matter transfer in food webs. We hypothesized that nutrient enrichment shifts the trophic position of omnivores towards herbivory, as the nutritional quality of primary producers increases. This hypothesis was tested by analyzing the ecological stoichiometry and stable isotope signature of primary producers and a wide range of aquatic macroinvertebrates, including primary consumers (herbivores) and secondary consumers (both potential omnivores and strict carnivores), along a eutrophication gradient in an agricultural landscape. Our results showed (1) that carbon : nutrient ratios of primary producers decreased along the eutrophication gradient, while the elemental composition of consumers remained homeostatic, and (2) that the trophic position of several omnivores and the generalist predator Notonecta decreased, while the trophic position of most other consumers remained constant. These findings suggest that shifts in the diets of aquatic invertebrates induced by increasing eutrophication may affect species interactions and food web structure in aquatic ecosystems"
Keywords:		Animals Carbon *Ecosystem Eutrophication *Food Chain Invertebrates aquatic consumers ecological stoichiometry food web structure nutrients omnivores primary producers stable isotopes trophic position;
Notes:		"Medlinevan der Lee, Gea H Vonk, J Arie Verdonschot, Ralf C M Kraak, Michiel H S Verdonschot, Piet F M Huisman, Jef eng Research Support, Non-U.S. Gov't 2020/12/23 Ecology. 2021 Mar; 102(3):e03275. doi: 10.1002/ecy.3275. Epub 2021 Feb 13"