Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X4220
Acta Limnologica Brasiliensia
Thematic Section: Limnology of Subtropical Aquatic Environments

Do changes in the water regime determine the abundance of the copepod trophic group in a Neotropical floodplain?

Mudanças no regime das águas determinam a abundância de grupos tróficos de copépodes em uma planície de inundação Neotropical?

Lenin Medeiros de Almeida Lino; Tatiane Mantovano; Vanessa G. Tibúrcio; Fábio Amodêo Lansac-Tôha

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Abstract

Abstract:

Aim: Our study evaluated the effects of extreme weather events and environmental conditions on the trophic groups of copepods (herbivores and omnivores) in the upper Paraná River floodplain.

Methods: The zooplankton were collected and Copepods and Rotifers were analyzed in nine environments of the upper Paraná River floodplain during 2000 and 2010, during which time the La Niña (drought) and El Niño (flood) climatic events occurred, respectively.

Results: The results suggest that in periods of extreme drought productivity-related variables act as determining forces on abundance of copepod trophic groups due to the contraction of aquatic ecosystems. Although the abundance of trophic groups is associated with system productivity, the responses between them differ, since herbivore abundance was associated with chlorophyll-a and total phosphorus and omnivores with rotifer abundance. In extreme flood (El Niño), no significant relationship was found between environmental variables and any trophic group.

Conclusions: In general, it is believed that in periods of extreme drought the variables associated with productivity act as determining forces on the abundance of trophic groups of copepods due to the contraction of aquatic ecosystems. According to the results found, it is suggested that other works be carried out with a greater number of extreme events to corroborate our results and, and also to extrapolate to other aquatic communities.
 

Keywords

climate events, microcrustaceans, trophic guilds, floodplain

Resumo

Resumo:

Objetivo: Nosso estudo avaliou os efeitos de eventos climáticos extremos e condições ambientais sobre os grupos tróficos (herbívoros e onívoros) de copépodes na planície de inundação do alto rio Paraná.

Métodos: O zooplâncton foi coletado e copépodes e rotíferos foram analisados em nove ambientes da planície de inundação do alto rio Paraná, durante os anos de 2000 e 2010, períodos que ocorreram os eventos climáticos La Niña (seca) e El Niño (cheia), respectivamente.

Resultados: Os resultados sugerem que em períodos de seca extrema (La Niña) as variáveis associadas a produtividade atuem como forças determinantes sobre a abundância de grupos tróficos de copépodes devido a contração dos ecossistemas aquáticos. As respostas entre as abundâncias dos grupos tróficos divergem apesar de estarem associados a produtividade do sistema, uma vez que a abundância de herbívoros está associada a clorofila-a e ao fósforo total e dos onívoros à abundância de rotíferos. No período de cheia extrema (El Niño) não foi encontrada relação significativa entre as variáveis ambientais e grupos tróficos.

Conclusões: Acredita-se que em períodos de extrema seca as variáveis associadas à produtividade atuam como forças determinantes na abundância de grupos tróficos de copépodes devido à contração dos ecossistemas aquáticos. De acordo com os resultados encontrados, sugere-se que outros trabalhos sejam realizados com maior número de eventos extremos para corroborar com nossos resultados e, ainda para extrapolar para outras comunidades aquáticas.
 

Palavras-chave

eventos climáticos, microcrustáceos, grupos tróficos, planície de inundação

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