Distribution of Siluriformes in a river influenced by a hydroelectric power plant

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Distribution of Siluriformes in a river influenced by a hydroelectric power plant

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Garcia, T. D., Ota, R. R., Ferreira, D. G., Nascimento, R. H., Galindo, B. A., Pereira, L. S., & Zanatta, A. S. (2020). Distribution of Siluriformes in a river under the influence of a small hydroelectric power plant of the Paraná River Basin, Brazil. Iheringia. Série Zoologia, 110. DOI 10.1590/1678-4766e2020005

https://doi.org/10.1590/1678-4766e2020005
http://www.scielo.br/scielo.php?pid=S00 ... ct&tlng=pt
ABSTRACT
When a river is dammed, impacts differ according to distance from the dam under consideration, and sites closer to the dam are more affected than distant ones. Damming a river changes the flow and landscape characteristics, which, in turn, change the hydrological, limnological and ecological dynamics, such as biological production, species distribution, and ecosystem structuring, functioning and services. This study evaluates the distribution pattern of the Siluriformes (catfish) fish species near a small hydroelectric power plant in the Jaguariaíva River, considering three distinct distances from the dam: upstream region, reservoir and downstream region. Samples were taken with gillnets between March 2013 and December 2014. The abundance and richness of the Siluriformes species were evaluated. A permutational multivariate analysis of variance was used to access possible differences in species composition among sites. Finally, a permutational analysis of multivariate dispersion was used to assess possible differences among sampling sites and to examine composition similarities among sites. A total of 840 Siluriformes individuals were captured, distributed among ten species and four families. The highest richness was observed in the downstream region, while the lowest richness was observed in the reservoir area. Differences in the abundance of species were observed between the three distinct regions; the downstream region presented the highest species abundance (CPUE), whereas the lowest abundance was observed in the dam region. and were abundant species, but exclusively sampled in the downstream region, while ["(Ln6)" added for CLOG] and presented their highest abundance in the upstream region. The distinct longitudinal distribution of Siluriformes observed in this study can be interpreted as indicative of the negative effects of damming. Our study suggests that building small dams may result in negative impacts on the fish assemblage, impacts comparable to those of large reservoirs in terms of spatial changes. It is fundamentally necessary to better evaluate the environmental impacts of small dams in the Neotropical region, especially because few is known about them and how such impacts are comparable to impacts of larger reservoirs.
  • Keywords : fish assemblage; ichthyofauna; catfish; Paraná basin; reservoir
Tab. I. Capture per unit effort (unit: nº individuals/1,000 m² net/16 hours) of Siluriformes captured in the Jaguariaíva River, Upper Parana River basin, between 2013 and 2014. (-) indicates absence.

Species caught:









Attachments
Fig. 1. Location of sampling sites in the Jaguariaiva River, Upper Parana River basin, Brazil: PCH Nova Jaguariaíva (bar); upstream (red circle); reservoir (black circle); downstream (yellow circle)
Fig. 1. Location of sampling sites in the Jaguariaiva River, Upper Parana River basin, Brazil: PCH Nova Jaguariaíva (bar); upstream (red circle); reservoir (black circle); downstream (yellow circle)
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