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Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X5722
Acta Limnologica Brasiliensia
Original Article

The relationship between zooplankton occupancy and abundance in a floodplain is mediated by the hydrological regime

A relação entre distribuição regional e abundância de espécies zooplanctônicas numa planície de inundação é mediada pelo regime hidrológico

Kamylla Nayara Jesus dos Santos; Priscilla de Carvalho; Ludgero Cardoso Galli Vieira; Rafaela Vendrametto Granzotti; Luis Mauricio Bini

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Abstract

Abstract:: Aim: Positive relationships between occupancy and abundance are often found for different groups of organisms and ecosystem types. However, to our knowledge, no study has sought to assess this relationship considering a context in which a particular mechanism is the most likely explanation. In this study, in addition to the positive relationship with abundance, we tested the hypothesis that occupancy of zooplankton species should be greater during the flood season because in this period the hydrological connectivity is greater than in the dry season, facilitating passive dispersal between floodplain environments.

Methods: Our study was carried out at 52 sites - including lakes and rivers - on the Araguaia River floodplain. We used an analysis of covariance to test the effects of abundance and hydrological period on zooplankton occupancy.

Results: We found, as expected, a positive relationship between occupancy and abundance of zooplankton species in each hydrological period. Our results also indicated that, with the increase in abundance, species occupancies were higher in the flood than in the dry season.

Conclusions: The positive effect of the flood on zooplankton occupancy can be explained by the increase in water level that increases the hydrological connectivity and the potential for plankton passive dispersal.

Keywords

Araguaia river, spatial distribution, flood pulse, hydrological connectivity, mechanisms

Resumo

Resumo:: Objetivo: Relações positivas entre distribuição regional e abundância são frequentemente encontradas para diferentes grupos de organismos e tipos de ecossistemas. No entanto, até onde sabemos, nenhum estudo buscou avaliar essa relação considerando um contexto no qual um determinado mecanismo fosse a explicação mais provável. Neste estudo, além da relação positiva com a abundância, nós testamos a hipótese de que a distribuição regional de espécies zooplanctônicas deveria ser maior durante o período de cheia uma vez que neste período a conectividade hidrológica é maior que no período de seca, facilitando a dispersão passiva entre os ambientes de uma planície de inundação.

Métodos: Nosso estudo foi realizado em 52 locais - incluindo lagoas e rios - na planície de inundação do rio Araguaia. Nós utilizamos uma análise de covariância para testar os efeitos da abundância e do período hidrológico sobre a distribuição regional.

Resultados: Encontramos, como esperado, uma relação positiva entre distribuição regional e abundância de espécies zooplanctônicas em cada período hidrológico. Nossos resultados também indicaram que, com o aumento da abundância, as distribuições regionais das espécies foram maiores no período de cheia.

Conclusões: O efeito positivo da cheia sobre a distribuição regional pode ser explicado pelo aumento do nível de água, que aumenta a conectividade hidrológica e o potencial de dispersão passiva do plâncton.
 

Palavras-chave

rio Araguaia, distribuição espacial, pulso de inundação, conectividade hidrológica, mecanismos

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Submitted date:
08/24/2022

Accepted date:
11/01/2022

Publication date:
11/17/2022

63767626a95395209e5d43d3 alb Articles
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Acta Limnol. Bras. (Online)

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