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Title: | Long-term study of reservoir cascade in south-eastern Brazil reveals spatio-temporal gradient in fish assemblages |
Keywords: | Araguari River (Brazil) Dam impact Freshwater fish Invasive species Longitudinal gradient Rio Araguari (Brasil) |
Issue Date: | 18-Sep-2018 |
Publisher: | CSIRO Publishing |
Citation: | LOURES, R. C.; POMPEU, P. S. Long-term study of reservoir cascade in south-eastern Brazil reveals spatio-temporal gradient in fish assemblages. Marine and Freshwater Research, [S.l.], v. 69, n. 12, p. 1983-1994, 2018. DOI: 10.1071/MF18109. |
Abstract: | In reservoir cascades, effects on fish assemblages are expected to strengthen over time and transfer from one reservoir to an adjacent one. To test this, fish-assemblage data from 23 years of monitoring in the Araguari reservoir cascade system, upper Paraná River basin, were analysed. The results showed a clear reduction in richness of native and migratory fish species and an increase of non-native species, following reservoir formation. Migratory species richness was higher in reservoirs that presented habitats similar to lotic stretches or tributaries upstream of the impounded area. There was a clear tendency for native species to decline and non-native fish species to increase, in a downstream direction. Fish assemblages became increasingly dissimilar as reservoirs became more distant from each other (longitudinal gradient) and were dominated by small and medium-sized species. Alongside longitudinal position, reservoir area, age and the presence of herbivorous non-native fish were found to be important predictors of variation in fish-assemblage structure. Results from the present study help clarify the potential accumulated impacts of reservoir cascades on fish diversity, which must be carefully considered in river-basin inventories for hydropower plants, and reinforce the importance of long-term monitoring, considering longitudinal and lateral dimensions of the basin. |
URI: | http://www.publish.csiro.au/MF/MF18109 http://repositorio.ufla.br/jspui/handle/1/33469 |
Appears in Collections: | DBI - Artigos publicados em periódicos |
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