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      Ecomorphology of Astyanax species in streams with different substrates

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          Abstract

          In the present study, we assessed the ecomorphology of two species of Astyanax in streams with different substrates found in the Rio São Francisco Basin. The dominant substrate of each stream was defined as either "fine" (0 to 2 mm), "gravel" (2 to 250 mm), "rock" (> 250 mm), or "leaf bank". We analyzed a total of 22 ecomorphological attributes of Astyanax intermedius Eigenmann, 1908 (127 individuals) and Astyanax rivularis (Lütken, 1875) (238 individuals) adults. We detected significant ecomorphological differences between the populations of A. rivularis and A. intermedius from habitats with different types of substrates. However, the two species did not show the same morphological differences depending on the type of substrate. These results confirmed the hypothesis that individuals from environments with different characteristics may have different ecomorphological patterns. Knowing that morphology is associated with habitat use and available resources, the loss of a resource or a modification in the environment may directly affect the permanence of a species, leading to a loss of morphologic diversity.

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          Most cited references29

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          Ecological morphology of freshwater stream fishes

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            Ecology, Bionomics and Evolution of the Torrential Fauna, with Special Reference to the Organs of Attachment

            S. Hora (1930)
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              Functional Morphology and Classification of Teleostean Fishes

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                zool
                Zoologia (Curitiba)
                Zoologia (Curitiba)
                Sociedade Brasileira de Zoologia (Curitiba )
                1984-4689
                February 2014
                : 31
                : 1
                : 42-50
                Affiliations
                [1 ] Universidade Federal de Lavras Brazil
                [2 ] Universidade Federal de Lavras Brazil
                [3 ] Universidade Federal de Lavras Brazil
                Article
                S1984-46702014000100006
                10.1590/S1984-46702014000100006
                cfc1faed-7749-44d9-857c-36c767835e39

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1984-4670&lng=en
                Categories
                ZOOLOGY

                Animal science & Zoology
                ecomorphological attributes,freshwater fish,habitat diversity,intraspecific differences,Convergence,divergence

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