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FOOD WEB OF A TROPICAL HIGH MOUNTAIN STREAM: EFFECTS OF NUTRIENT ADDITION Acta biol.Colomb.
CASTRO-REBOLLEDO,MARÍA ISABEL; MUÑOZ-GRACIA,ISABEL; DONATO-RONDÓN,JOHN CHARLES.
In order to define the effect of nutrient enrichment on trophic webs in an Andean mountain stream we performed an experiment using stable isotope ratios (δ15N and δ13C) to analyze different trophic compartments: 1) basal level: CPOM and biofilm; 2) primary consumers - macroinvertebrates: collector-gatherers (Heterelmis sp., Thraulodes sp. and Trichorythodes sp.), and collectorfilterers (Simulium sp.); 3) predators - fish (Oncorhynchus mykiss and Trichomycterus bogotensis). The average fractionation of nitrogen among the primary consumers with respect to CPOM was 4.7 ‰, and 1.7 ‰ with respect to biofilm. Predators incremented their δ15N signal by 5.9 % with respect to primary consumers. A depletion of δ15N was observed in Impact with respect to Control...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Food webs; Gut content; Isotope ratios; Nutrient enrichment; Trophic compartments.
Ano: 2014 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2014000100004
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