Organization patterns of headwater-stream fish communities in the Upper Paraguay–Paraná basins |
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Authors: | Sabrina B Valério Yzel Rondon Súarez Thiago R A Felipe Karina K Tondato and Lidiani Q L Ximenes |
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Institution: | (1) GASLAB/Laboratório de Ecologia, Universidade Estadual de Mato Grosso do Sul, Rod. Dourados-Itahum km 12, Dourados, MS, 79804-970, Brazil |
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Abstract: | We compared environmental influences on the assemblages of stream fishes of contiguous but biogeographically distinct parts
of the Upper Paraguay and Paraná basins in Brazil, aiming to describe the main distribution patterns of fish species in the
headwater streams. We analyzed bimonthly samples in 10 streams in each basin from January to November 2004. Sixty fish species
were collected, including 40 species in streams of the Paraguay Basin and 42 species in streams of the Paraná Basin. The species
abundance rank did not differ between the basins. We found a clear differentiation between the Paraguay and Paraná stream
fish assemblages. There were significant differences in species composition among streams, but no seasonal differences in
species composition. Connectivity between streams explains the differences in species composition for the Paraguay streams,
but not for the Paraná streams. Hydrological characteristics were the main factors determining species distribution in both
basins, suggesting that the migratory capacity of each species and biogeographical barriers may act to filter the local species
composition from the total species pool of colonizers.
Handling editor: S. M. Thomaz |
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Keywords: | Community ecology Species composition Streams Paraguay basin Paraná basin Brazil |
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