Fish assemblages associated to aquatic macrophytes in wetland environments of Pantanal de Poconé, State of Mato Grosso, Brazil. Biota Neotrop. 10(2): http:// www.biotaneotropica.org.br/v10n2/en/abstract?inventory+bn02310022010. Abstract:We examined the composition, richness and biomass of fish assemblages associated with aquatic macrophytes in temporary environments of the Pantanal de Poconé, State of Mato Grosso, Brazil. The fish were captured in April 2008 in five loan boxes and five locations along Coqueiro Bay, using seine nets at three points within each site. A total of 9646 specimens were captured, distributed in seven orders, 17 families and 59 species. The fish community was composed mainly of small-sized species (Characidae) and some juveniles of medium-sized species (Erythrinidae and Gymnotidae). In this study, few species were very abundant, some showed intermediate abundance, and most had low abundance. According to an analysis of similarity (Anosim) there was no difference in species composition between the environments. Species richness, total abundance and biomass did not vary spatially. Thus, the results suggest that the similarity of the fish fauna can be attributed to flooding, since this phenomenon homogenizes the abiotic characteristics and enlarges the area for the distribution of fish. This fact seems to be very important for these small fish species, since many species need to inhabit specific sites during certain stages; for example, these environments may function as temporary refuges. This aspect may ensure the survival of many individuals until they reach a stage in life where predation is significantly reduced. Resumo: Este estudo avaliou a composição, riqueza e a biomassa das assembléias de peixes associadas às macrófitas aquáticas em ambientes temporários do Pantanal de Poconé -MT. A coleta foi realizada em abril de 2008, em cinco caixas de empréstimo e cinco locais na baía do Coqueiro, por meio de rede de cerco, em três pontos dentro de cada local. Foram capturados 9646 exemplares, distribuídos em sete ordens, 17 famílias e 59 espécies. A comunidade de peixes foi composta principalmente por espécies de pequeno porte (Characidae) e alguns juvenis de espécies de médio porte (Erythrinidae e Gymnotidae). Poucas espécies foram muito abundantes, algumas apresentaram abundância intermediária e a maioria apresentou baixa abundância. A análise de similaridade (Anosim) mostrou que não existe diferença na composição de espécies entre os ambientes. A riqueza de espécie e a biomassa dos peixes também não diferiram espacialmente. Desta forma, nossos resultados sugerem que a similaridade da ictiofauna é uma conseqüência da inundação, uma vez que esta permite a homogeneização das características abióticas e amplia a área de distribuição dos peixes. Este fato aparenta ser de grande importância para estes pequenos peixes, considerando que muitas espécies necessitam de lugares específicos em determinados estágios, como, por exemplo, esses ambientes temporários que podem servir de refúgio. Este aspec...
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