Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X2922
Acta Limnologica Brasiliensia
Original Article

The fish fauna of Itutinga reservoir, 30 years after the first survey

A ictiofauna do reservatório de Itutinga, após 30 anos do primeiro levantamento

Andressa Mendes Silva-Sene; Ivo Gavião Prado; Carina Patez Porto; Paulo Santos Pompeu

http://dx.doi.org/10.1590/S2179-975X2922 Acta Limnol. Bras. (Online), vol.36, e11, 2024
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Abstract

Aim: Monitoring altered environments is crucial to understand the impacts and the possible changes in the local fish fauna. Therefore, we aimed to compare the ichthyofauna within a 67-year-old small run-of-the-river reservoir with surveys carried out in 1986 and 2019-2021 and update the checklist of this reservoir.

Methods: We used the data provided by Alves et al. (1998) and sampled fish in two sites inside Itutinga reservoir using gill nets, seine nets and hand nets and at the one tributary of the area using only hand nets.

Results: We collected a total of 12,978 individuals belonging to 37 fish species, and the species accumulation curve showed a tendency to the asymptote. Five of the sampled species are non-native and five are migratory. Alves et al. (1998) sampled a total of 25 fish species, 17 genera, 9 families and 3 orders. We added 12 fish species to the checklist that were not recorded by Alves et al. (1998), including four non-native and two migratory. On the other hand, two migratory species and one rheophilic were registered only in the preview study. In addition, we observed important changes in the species abundance rank.

Conclusions: The differences in the fish assemblage structure comparing both studies indicate important changes in fish assemblages over more than 33 years. Our results highlighted the importance of long-term fish monitoring in altered environments to assess temporal variation in fish assemblages and their responses to the multiple possibilities of external stressors, such as the shift in abundance of non-native species in these environments.

Keywords

fish assemblage variation, dam, reservoir, long-term fish monitoring

Resumo

Objetivo: O monitoramento de ambientes alterados é crucial para o entendimento dos impactos e avaliação de mudança na ictiofauna local. Dessa forma, o objetivo do nosso trabalho foi comparar a fauna de peixes de um pequeno reservatório do tipo fio d'água de 67 anos de idade com amostragens realizadas em 1986 e entre 2019 e 2021, além de atualizar a lista de espécies de peixes deste reservatório.

Métodos: Nós utilizamos dados provenientes do estudo de Alves et al. (1998) e de peixes amostrados em dois pontos no interior do reservatório de Itutinga utilizando redes de emalhar, arrasto e peneira e em um ponto no único tributário da região utilizando peneira.

Resultados: Coletamos um total de 12.978 indivíduos pertencentes a 37 espécies de peixes, sendo que a curva de acumulação de espécies mostrou tendência à assíntota. Destas, cinco espécies eram não nativas e cinco eram migradoras. O estudo de Alves et al. (1998) coletou um total de 25 espécies, 17 gêneros, 9 famílias e 3 ordens. Adicionamos 12 espécies à lista que não haviam sido registradas por Alves et al. (1998), incluindo quatro não nativas e duas migradoras. Por outro lado, duas espécies migradoras e uma reofílica foram registradas apenas no estudo anterior. Ademais, observamos alterações importantes no ranking de abundância de espécies entre os dois estudos.

Conclusões: As diferenças na estrutura das assembleias de peixes comparando os dois estudos indicam importantes mudanças na comunidade 33 anos após o primeiro estudo. Nossos resultados destacam a importância da realização de monitoramentos de longa duração em ambientes alterados para avaliar temporalmente as variações na assembleia de peixes e as suas respostas às múltiplas possibilidades de estressores externos como o aumento da abundância de espécies não nativas nestes ambientes.

Palavras-chave

mudança na assembleia de peixes, barramento, reservatório, monitoramento de peixes de longa duração

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Submitted date:
04/29/2022

Accepted date:
03/11/2024

Publication date:
04/22/2024

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