Habitat and community structure modulate fish interactions in a neotropical clearwater river

Nunes, Lucas T., Morais Araujo, Renato, Longo, Guilherme O., Sabino, José, and Floeter, Sergio R. (2020) Habitat and community structure modulate fish interactions in a neotropical clearwater river. Neotropical Ichthyology, 18 (1). e190127.

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Abstract

Species interactions can modulate the diversity and enhance the stability of biological communities in aquatic ecosystems. Despite previous efforts to describe fish interactions in tropical rivers, the role of habitat characteristics, community structure, and trophic traits over these interactions is still poorly understood. To investigate among-habitat variation in substratum feeding pressure and agonistic interactions between fishes, we used remote underwater videos in three habitats of a clearwater river in the Central Western, Brazil. We also performed visual surveys to estimate the abundance and biomass of fishes and proposed a trophic classification to understand how these variables can affect fish interactions. Community structure was the main factor affecting the variation in the interactions among the habitats. Biomass was the main variable determining which habitat a fish will feed on, while species abundance determined with how many other species it will interact in the agonistic interaction networks for each habitat. Specific habitats are not only occupied, but also used in distinct ways by the fish community. Overall, our results demonstrate the importance of the heterogeneity of habitats in tropical rivers for the interactions performed by the fishes and how the intensity of these interactions is affected by community structure.

Item ID: 67368
Item Type: Article (Research - C1)
ISSN: 1982-0224
Keywords: Bodoquena plateau, Centrality, Characidae, Feeding pressure, Habitat heterogeneity
Copyright Information: © 2020 The Authors. Diversity and Distributions Published by SBI. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Date Deposited: 15 Apr 2021 02:07
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310304 Freshwater ecology @ 70%
31 BIOLOGICAL SCIENCES > 3103 Ecology > 310302 Community ecology (excl. invasive species ecology) @ 30%
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