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Variacion de la amplitud del nicho isotopico de tres especies de peces en un gradiente de disponibilidad de recursos

Abstract : To study the effect of resource availability on the trophic niche width of fishes in the Bolivian Amazon basin, we compared isotopic niche widths (as a surrogate for trophic niche) of three fish species (Acestrorhynchus altus, Hoplias malabaricus and Pygocentrus nattereri) in a gradient of prey availability. We sampled fishes in lakes located in the floodplain of the rivers Blanco (low prey availability), Iténez (intermediate prey availability) and San Martín (high prey availability), analyzed them for ratios of stable isotopes (δ13C and δ15N), and estimated the standard ellipse and isotopic niche width using the SIBER package in R. Acestrorhynchus altus behaved as an optimal forager, showing wider isotopic niche where prey were less abundant, and less wide isotopic niche in rivers with intermediate and high prey availability. P. nattereri showed wider trophic niche at intermediate prey densities and H. malabaricus showed no effect of prey availability on isotopic niche width. This indicates that, for these species, factors such as prey selectivity, water transparency, mouth size or feeding habits, may be more important than prey availability in determining trophic niche width.
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Submitted on : Wednesday, April 29, 2020 - 10:55:23 AM
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Aldo Echeverría, Marc Pouilly, Danny Rejas. Variacion de la amplitud del nicho isotopico de tres especies de peces en un gradiente de disponibilidad de recursos. Ecologia en Bolivia, Revista del Instituto de Ecología, 2020, 55 (1), pp.6-15. ⟨ird-02558029⟩

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