The influence of shoreline availability on the density and richness of Chironomid larvae in Neotropical floodplain lakes
Keywords:
Biodiversity, lnvertebrates, Littoral zone, Margin region, Upper Paraná River, Zoobenthic communityAbstract
The shoreline development índex was created for temperate lake . However, Neotropical lakes have different geological formations. For example, the difference between the littoral and limnetic zones in Neotropica·l1akes is not as sharp as those in temperate one, dueto their low depths. Here, we proposed a modification of the shoreline development índex for tropical lakes. We applied the modified índex in 27 floodplain lakes of the Upper Paraná River. We 'found significant and positive relationships between the modified índex and the density and richness of chironomids. These results suggest that the higher the availability of margins the higher the density and richness of larvae. The littoral zone of so/ne lakes is complex, with submersed or emergent macrophytes, as well as br;nches and leaves that provide a wealth of habitats in this region. Therefore, the larger littoral zone seems to be the main factor structuring the chironomid fOmmunity. Therefore, the modified índex is an important statistical tool to indicate lakes in which chironomid richness is high due to the higher availability of littoral zone.
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