Trophic diversity and carbon sources supporting fish communities along a pollution gradient in a tropical river

The Science of the Total Environment
Débora Reis de CarvalhoPaulo Santos Pompeu

Abstract

Anthropogenic activities can have a great influence on water quality and in the availability of habitat and food resources, which can promote changes in the trophic diversity and carbon sources sustaining aquatic communities. The objective of this study was to evaluate if the trophic diversity and the main carbon sources sustaining fish communities change along a pollution gradient. The study was carried out at eight sites distributed along the Rio das Velhas, a Brazilian river highly impacted by anthropogenic activities, in which the discharge of domestic and industrial sewage from the Metropolitan Region of Belo Horizonte (MRBH) presents a major source of pollution. Using carbon (δ13C) and nitrogen (δ15N) isotope ratios, we identified the major carbon sources/food sources of common fish species and calculated six metrics of trophic diversity. Autochthonous primary producers (algae, periphyton, and macrophytes) were the main carbon sources for all trophic guilds at all sites, but notably, sewage-derived organic matter was an additional significant carbon source to the fish community in the most polluted testing site. Here, the community was composed mainly by detritivorous and omnivorous fishes and exhibited greater ranges of ...Continue Reading

Citations

Sep 5, 2021·Oecologia·Débora Reis de CarvalhoPaulo Santos Pompeu
Jan 8, 2022·The Science of the Total Environment·Fausto Machado-SilvaTimothy Peter Moulton

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