Taxonomic and numeric structure of Chironomidae (Diptera) in different habitats of a Neotropical floodplain

Iheringia. Série Zoologia

Cristina Márcia De Menezes Butakka²  Luiz Carlos Gomes¹  Alice Michiyo Takeda¹ 

[1] ,Centro de Pesquisa em Limnologia, Biodiversidade e Etnobiologia do PantanalCáceres MT ,Brazil

关键词: Chironomidae larvae;    biomass;    diversity;    dominance;    Paraná River;    Larvas de Chironomidae;    biomassa;    diversidade;    dominância;    Rio Paraná;   

DOI  :  10.1590/1678-476620141043314322

来源: SciELO

【 摘 要 】

We characterized the local benthic Chironomidae by analyzing the numerical density, biomass, diversity index of Shannon-Wiener and dominance of larvae in the main channel of the Ivinhema River, in a secondary channel, in five lakes connected to the main channel and in five lakes without connection. Of the 68 taxa identified, Aedokritus sp., Tanytarsus sp., Chironomus strenzkei Fittkau, 1968 and Procladius sp.1 were found in all sampling sites and were considered morphospecies with greater of greatest ecological plasticity. Chironomus strenzkei Fittkau, 1968, contributed with the greatest biomass in the central region of lakes without connection, whereas Aedokritus sp. dominated in the littoral of lakes. The greater values of diversity indices in the littoral region of channels were due to the greater water flow and to the higher food availability in these areas. The dominance indices, by contrast, were greater on the central region of these environments. The littoral region has exclusive characteristics, representing habitats that could play important controlling in the numerical density and index diversity on the ecosystem, whereas that the biomass of benthic invertebrates in the central region in some biotopes would have different spatial probably according organisms drift.

【 授权许可】

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