Data/hora: 01/06/2024 18:12:55

Provedor de dados: | Neotropical Ichthyology
País: | Brazil
Título: | Hydropower affects fish trophic structure both downstream of the dam and upstream of the reservoir
Autores: | Fráguas,Patrícia Santos; Pompeu,Paulo Santos.
Data: | 2021-01-01
Ano: | 2021
Palavras-chave: | Feeding; Fish assemblage; Irapé; Jequitinhonha River; Trophic guild.
Resumo: | ABSTRACT Dams often cause drastic changes in freshwater environments and can compromise the quality and availability of food resources in rivers. This study aims to analyze the influence of a dam on the trophic structure of fish assemblages in lotic areas located both upstream and downstream of the Irapé Hydroelectric Power Plant. Fish sampling occurred before (2003 to 2005) and after (2011 to 2017) the impoundment, which began in 2006. The trophic structure and species composition before dam construction were similar upstream of the reservoir and downstream of the dam. After the building of the dam, both aspects of the assemblages changed along the lotic stretches - the upstream incurred an increase in biomass of detritivores and a decrease of piscivores and omnivores, while downstream went exactly the opposite, causing a differentiation between the two assemblages. Because lotic areas upstream of reservoirs are also impacted by river damming, efforts for impact mitigation should also focus on these areas.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100212
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/1982-0224-2020-0071
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.19 n.1 2021
Fonte: | info:eu-repo/semantics/openAccess