Artigo

Short term effects of Tucuruí Dam (Amazonia, Brazil) on the trophic organization of fish communities

A dam on a river course induces numerous changes in the aquatic environment both in the newly formed reservoir and in the river downstream. These changes modify the food resources available to fishes. As a consequence, fish communities undergo rapid transformations particularly in terms of trophic o...

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Autor principal: Merona, Bernard de
Outros Autores: Santos, Geraldo Mendes dos, Goncçalves de Almeida, Raimunda
Grau: Artigo
Idioma: English
Publicado em: Environmental Biology of Fishes 2020
Assuntos:
Community Structure
Dam
Ecological Impact
Ichthyofauna
Trophic Structure
Brasil
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/19123
id oai:repositorio:1-19123
recordtype dspace
spelling oai:repositorio:1-19123 Short term effects of Tucuruí Dam (Amazonia, Brazil) on the trophic organization of fish communities Merona, Bernard de Santos, Geraldo Mendes dos Goncçalves de Almeida, Raimunda Community Structure Dam Ecological Impact Ichthyofauna Trophic Structure Brasil A dam on a river course induces numerous changes in the aquatic environment both in the newly formed reservoir and in the river downstream. These changes modify the food resources available to fishes. As a consequence, fish communities undergo rapid transformations particularly in terms of trophic organization. Tucuruí Dam, closed on the Tocantins River, Brazil, in September 1984, formed a large reservoir of approximately 2200 km2. Analyses of fish stomach contents were performed before and after the completion of the dam in the downstream section of the fiver as well as in the reservoir. Resource availability was seen through the relative contribution of food items in supporting the biomass. Main changes caused by the dam consisted of an increase in fishes as a food resource and of a parallel decrease of sediment both in the reservoir and in the downstream part of the river. In addition, in the downstream section, the relative contribution of plankton as a food resource diminished after dam closure. We identified 8 feeding regimes before dam closure. From them the trophic structure of fish communities were established and compared. Most of the community biomass was from specialist feeders. Contribution of piscivores increased after closure; planktivores became unimportant after closure downstream. Some species were shown to change their diet in the transformed environments either downstream or in the reservoir. However, these changes in individual species diet did not seem to play a major role in the transformation of trophic structure of the fish communities. 2020-06-15T22:05:34Z 2020-06-15T22:05:34Z 2001 Artigo https://repositorio.inpa.gov.br/handle/1/19123 10.1023/A:1011033025706 en Volume 60, Número 4, Pags. 375-392 Restrito Environmental Biology of Fishes
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language English
topic Community Structure
Dam
Ecological Impact
Ichthyofauna
Trophic Structure
Brasil
spellingShingle Community Structure
Dam
Ecological Impact
Ichthyofauna
Trophic Structure
Brasil
Merona, Bernard de
Short term effects of Tucuruí Dam (Amazonia, Brazil) on the trophic organization of fish communities
topic_facet Community Structure
Dam
Ecological Impact
Ichthyofauna
Trophic Structure
Brasil
description A dam on a river course induces numerous changes in the aquatic environment both in the newly formed reservoir and in the river downstream. These changes modify the food resources available to fishes. As a consequence, fish communities undergo rapid transformations particularly in terms of trophic organization. Tucuruí Dam, closed on the Tocantins River, Brazil, in September 1984, formed a large reservoir of approximately 2200 km2. Analyses of fish stomach contents were performed before and after the completion of the dam in the downstream section of the fiver as well as in the reservoir. Resource availability was seen through the relative contribution of food items in supporting the biomass. Main changes caused by the dam consisted of an increase in fishes as a food resource and of a parallel decrease of sediment both in the reservoir and in the downstream part of the river. In addition, in the downstream section, the relative contribution of plankton as a food resource diminished after dam closure. We identified 8 feeding regimes before dam closure. From them the trophic structure of fish communities were established and compared. Most of the community biomass was from specialist feeders. Contribution of piscivores increased after closure; planktivores became unimportant after closure downstream. Some species were shown to change their diet in the transformed environments either downstream or in the reservoir. However, these changes in individual species diet did not seem to play a major role in the transformation of trophic structure of the fish communities.
format Artigo
author Merona, Bernard de
author2 Santos, Geraldo Mendes dos
Goncçalves de Almeida, Raimunda
author2Str Santos, Geraldo Mendes dos
Goncçalves de Almeida, Raimunda
title Short term effects of Tucuruí Dam (Amazonia, Brazil) on the trophic organization of fish communities
title_short Short term effects of Tucuruí Dam (Amazonia, Brazil) on the trophic organization of fish communities
title_full Short term effects of Tucuruí Dam (Amazonia, Brazil) on the trophic organization of fish communities
title_fullStr Short term effects of Tucuruí Dam (Amazonia, Brazil) on the trophic organization of fish communities
title_full_unstemmed Short term effects of Tucuruí Dam (Amazonia, Brazil) on the trophic organization of fish communities
title_sort short term effects of tucuruí dam (amazonia, brazil) on the trophic organization of fish communities
publisher Environmental Biology of Fishes
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/19123
_version_ 1787143752967520256
score 11.755432

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