Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X5724
Acta Limnologica Brasiliensia
Thematic Section: Neotropical Zooplankton Symposium

Hatching of Cladocera (Crustacea: Branchiopoda) resting eggs from permanently hydrated and temporarily dehydrated sediments of an Amazon lake

Eclosão dos ovos de resistência de Cladocera (Crustacea: Branchiopoda) dos sedimentos permanentemente hidratados e temporariamente desidratados de um lago amazônico

Camila de Araújo Couto; Raize Castro-Mendes; Renan Gomes do Nascimento; Alexander Armando Flores Arzabe; Luis Geraldes Primeiro; Maiby Glorize da Silva Bandeira; Edinaldo Nelson dos Santos-Silva

http://dx.doi.org/10.1590/S2179-975X5724 Acta Limnol. Bras. (Online), vol.36, e104, 2024
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Abstract

Aim: i) to characterize the composition of the Cladocera species hatched from the resting eggs of permanently hydrated and temporarily dehydrated sediments; ii) to test whether periodic dehydration reduces the hatching of the resting eggs.

Methods: Cladocera resting eggs were collected from the sediment of Tupé lake, Amazonas, Brazil. Sampling was performed in the dry season, when the sediment was found in two conditions: Permanently Hydrated Sediment (PHS) in the lake main channel and Temporarily Dehydrated Sediment (TDS) on the margin. Hatching was experimented through a temperature of 24 °C (± 2 °C) and a photoperiod of 12h light: 12h dark, for 20 days.

Results: Eight Cladocera taxa were counted among the two sediments. In PHS five taxa (one exclusive) were identified and seven taxa (three exclusive) occurred in TDS. The comparison of the hatching rate of Cladocera eggs between TDS (0.36 ± 0.48%) and PHS (0.32 ± 0.49%) was not significant (GLM: χ21= 0.012; P > 0.05; Pseudo-R2M= 0.0006).

Conclusions: The hypothesis that periodic dehydration of Cladocera resting eggs reduces egg hatching has been refuted. This leads us to conclude that natural periodic dehydration does not affect the hatching of resistance eggs, therefore, resistance eggs, as already reported in the literature are an important mechanism for the maintenance and success of organisms in environments, even undergoing profound changes caused due to the large variation in water levels that occur in Amazon rivers and associated environments.

Keywords

diapause; dormancy; ephippium; zooplankton

Resumo

Objetivo: i) caracterizar a composição das espécies de Cladocera eclodidas dos ovos de resistência de sedimentos permanentemente hidratados e temporariamente desidratados; e ii) testar se a desidratação periódica reduz a eclosão dos ovos de resistência.

Métodos: Os ovos de resistência de Cladocera foram coletados do sedimento do lago Tupé, Amazonas, Brasil. A amostragem foi realizada no período da seca, quando o sedimento é encontrado em duas condições: i) sedimento permanentemente hidratado (SPH) no canal do lago; e ii) sedimento temporariamente desidratado (STD) nas margens. Com isso foi realizado um experimento de eclosão, com temperatura de 24 °C (± 2 °C) e fotoperíodo de 12h claro: 12h escuro, durante 20 dias.

Resultados: Dos dois tipos de sedimentos foram contabilizados oito táxons de Cladocera. Em PHS foram identificados cinco táxons (um exclusivo) e em TDS ocorreram sete espécies (três exclusivas). A comparação da proporção de eclosão dos ovos de Cladocera entre STD (0,36 ± 0,48%) e SPH (0,32 ± 0,49%) não foi estatisticamente significativa (GLM: χ21= 0,012; P > 0,05; Pseudo-R2M= 0,0006).

Conclusões: A hipótese de que a desidratação periódica dos ovos de resistência de Cladocera reduz a eclosão dos ovos foi refutada. Isto nos leva a concluir que a desidratação periódica natural não afeta a eclosão de ovos de resistência, portanto, os ovos de resistência, como já reportado na literatura são um importante mecanismo de manutenção e sucesso dos organismos nos ambientes, mesmo sofrendo profundas modificações causadas pela grande variação do núvel das águas que ocorrem nos rios amazônicos e ambientes associados.

Palavras-chave

diapausa; dormência; efípio; zooplâncton

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Submitted date:
13/06/2024

Accepted date:
14/10/2024

Publication date:
26/11/2024

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