Resumo

CONTRERAS, F.I. et al. Cambios morfométricos de lagunas aluviales del río Paraná y su incidencia en la diversidad íctica. Rev. vet. [online]. 2017, vol.28, n.1, pp.51-55. ISSN 1669-6840.

To understand which are the environmental characteristics that affect aquatic communities of floodplain lakes it is necessary to possess beforehand information regarding shapes and dimensions as morphometry intervenes in the variables related to erosion, sedimentation, nutrient`s charge, physicochemical characteristics, among others. Renovation of the waters of floodplain lakes is closely linked to the flood pulse of the latter, considering the importance of the height of water level and the duration of the flood period. Different topographic levels of the floodplain can generate different responses in the lagoons, regardless of being close to each other. The aim of this assay is to apply flooding models in the study of the floodplain of the Paraná river in order to establish the topographical differences between two lakes and their implications for the diversity of fish species to determine their responses to flood pulses and consequently their morphometric and biological differences. For this, the Increase level water tool of the Global Mapper 15.1 software was used considering a digital elevation model generated from an SRTM image. The results showed that the Galloso lagoon is 2 m below the Melilla lagoon leaving the former more exposed to flood pulses of the Paraná River. This situation is reflected in their morphometric variations among the years under consideration, having Galloso lagoon increased 19 times its surface while Melilla lagoon remained stable. In conclusion, this topographic difference and proximity to the Paraná River may be the main reason why Galloso lagoon has 80 fish species while Melilla lagoon only 49.

Palavras-chave : fish; floodplain lakes; Paraná River; repercussion in aquatic communities.

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