Structure of the testate amoebae community in different habitats in a neotropical floodplain

Brazilian Journal of Biology

Fa Lansac-tôha¹  Lfm Velho¹  Dm Costa¹  Nr Simões¹  Gm Alves¹ 

关键词: protists;    floodplain lake;    aquatic macrophytes;    plankton;    sediment;    protistas;    planície de inundação;    macrófitas aquáticas;    plâncton;    sedimento;   

DOI  :  10.1590/1519-6984.24912

来源: SciELO

【 摘 要 】

This study evaluated the differences in composition, abundance and morphology of testate amoebae among different habitats of the same aquatic environment (plankton, aquatic macrophyte and sediment) in the Upper Paraná River floodplain. Triplicate samplings were undertaken monthly at each habitat from April 2007 to March 2008. The structure of the community of testate amoebae was different among the habitats. The species typical for each habitat, according to Indval, were classified by their shell morphology. Arcella species together with Difflugia gramen and Difflugia pseudogramem were more abundant for plankton. Trinema and Phryganellastood out by their abundance and frequency in aquatic macrophytes. Centropyxis was an indicator of sediment. The results indicated a higher frequency of hemispherical and spherical shells in plankton and spherical and elongated shells in aquatic macrophytes. In the sediment, there was a high frequency of elongated species. Our results support the hypothesis that the community of testate amoebae has different structures among the habitats, refuting the idea that the organization of this community in plankton is guided by random events like the resuspension of organisms from the sediment and their displacement from marginal vegetation.

【 授权许可】

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