Efeitos do pulso de inundação sobre a comunidade de Loricariidae (Pisces, Siluriformes) em lagoas do Pantanal, Brasil

Autores

  • Gustavo Figueiredo Marques LEITE Universidade de Bras-­­lia -  UnB, Núcleo de Estudos e Pesquisas Ambientais e Limnológicas -  NEPAL, Campus Planaltina / Universidade de Bras-­­lia - UnB, Instituto de Ciências Biológicas, Programa de Pós-graduação em Ecologia, Campus Universitário Darcy Ribeiro http://orcid.org/0000-0002-6836-0948
  • Renan de Souza REZENDE Universidade Federal Rural do Semi-Árido -  UFERSA, Pró-Reitoria de Pesquisa e Pós-graduação da UFERSA http://orcid.org/0000-0002-4129-0863
  • Hugmar PAINS DA SILVA Universidade Estadual de Maringá -  UEM, Programa de Pós-graduação em Biologia Comparada
  • Claumir Cesar MUNIZ Universidade do Estado de Mato Grosso -  UNEMAT, Laboratório de Ictiologia do Pantanal Norte -  LIPAN http://orcid.org/0000-0002-2082-2234

DOI:

https://doi.org/10.20950/1678-2305.2018.274

Palavras-chave:

peixes, conectividade lateral, pulso de inundação, Pantanal

Resumo

 Variações sazonais podem promover alterações ambientais, e consecutivamente, influenciar a estrutura da assembleia de peixes. Os objetivos desse estudo foram i) investigar o efeito do pulso de inundação e conectividade lateral sobre a assembleia de Loricarií­­deos em lagoas marginais; e ii) determinar os fatores ambientais que controlam estrutura local dessas espécies no Pantanal Matogrossense. Para isso foi amostrado a comunidade í­­ctica de duas lagoas marginais, entre setembro de 2005 e agosto de 2007. As assembleias foram afetadas sobretudo por flutuações sazonais e pouco estruturada espacialmente, demonstrando que o pulso de inundação tem papel preponderante na estruturação de Loricariidae. Além disso, a homogeneidade das assembleias entre as lagoas apontou um frequente movimento dos peixes entre os diferentes subsistemas, o que sugere um alto ní­­vel de interação e mistura entre os habitats ao longo da planí­­cie de inundação. O pulso de inundação também se manifestou em mudanças significativas na profundidade, oxigênio dissolvido e turbidez ao longo do perí­­odo de estudo, determinantes para a estrutura das assembleias. Assim, ficou evidente que mudanças ambientais sazonais e a conectividade são fatores determinantes da estrutura das assembleias de Loricariidae nas lagoas marginais no Pantanal, sustentando elevada diversidade e abundí­¢ncia.

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2018-12-16

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Artigo cientí­fico