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Longitudinal patterns of fish assemblages in a large tropical river in southeastern Brazil: evaluating environmental influences and some concepts in river ecology

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Abstract

This study aimed to evaluate environmental influences on fish distribution and to assess the extent to which concepts in river ecology accommodate levels of spatio-temporal heterogeneity of fish assemblages in a 1,080-km long tropical river. A total of 25 sites were sampled between November 2002 and March 2003 in two seasons (summer/wet versus winter/dry). A thermal gradient separating the upper reaches from the lower reaches was detected. The middle-upper reaches showed higher conductivity and lower dissolved oxygen and pH levels compared with the other reaches. Although some significant associations were found between some fish abundance and environmental variables, the most abundant species (Tilapia rendalli, Geophagus brasiliensis, and Oligosarcus hepsetus) occurred in most sites and under most environmental conditions. Fish community structure varied more in space (longitudinal) than through time (seasonal). The community in the lower reach species was more diverse in comparison with the other reaches. Differences in the fish assemblage structure among the longitudinal river sections appear to have been influenced by the effects of damming, and seem to be partially consistent with the Serial Discontinuity Concept, which views dams as discontinuities within the river continuum. Only the lower river reach showed seasonal differences in the fish community structure, attributable to the influence of flooding. Management plans and biodiversity conservation will benefit by considering the effects of dam disruption and flood increased connectivity to the lotic systems.

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Acknowledgements

We thank Bianca de Freitas Terra, Eduardo Oliveira Estiliano, Daniel Gracia, and Paulo Cesar Silva for help with the fieldwork. Dr. Joel Trexler provided comments that helped to improve the manuscript. The programme CNPq-CT-HIDRO—Brazilian Agency for Scientific Development and Research supplied initial financial support for this project (Proc. 550047-2002-6). The Rio de Janeiro Foundation for Research Development—FAPERJ—Rio de Janeiro Agency for Research (Cientísta do Nosso Estado—Proc. E-26/152.463/2002) funded the second part of the field research.

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Araújo, F.G., Pinto, B.C.T. & Teixeira, T.P. Longitudinal patterns of fish assemblages in a large tropical river in southeastern Brazil: evaluating environmental influences and some concepts in river ecology. Hydrobiologia 618, 89–107 (2009). https://doi.org/10.1007/s10750-008-9551-5

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