Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X4221
Acta Limnologica Brasiliensia
Artigo Original

Factors stimulating the hatching of resting eggs and their contribution to the composition of cladoceran assemblages in tropical temporary lagoons

Fatores que estimulam a eclosão de ovos de resistência e a sua contribuição para a composição das assembleias de cladóceros em lagoas temporárias tropicais

Wesley Luiz Guimarães; Eliana Aparecida Panarelli; Natan Guilherme dos Santos; Maria Stela Maioli Castilho-Noll

http://dx.doi.org/10.1590/S2179-975X4221 Acta Limnol. Bras. (Online), vol.36, e28, 2024
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Abstract

Aim: We aimed to verify the contribution of cladocerans’ resting eggs to the active communities of temporary lagoons and, through an experiment, identify which conditions induce high hatching rates.

Methods: Cladocera assemblages were sampled in four temporary lagoons in the Turvo River floodplain (20° 22’S and 49° 16’W), in the northwest region of São Paulo State, Brazil. Sediment samples were taken during the dry season from a depth of 5 cm, using a 4.5 cm diameter corer. Plankton samples were taken from the water column before and after the dry season. For the hatching test, two treatments were performed 1. Natural condition – without light and temperature control; 2. Controlled condition – with controlled photoperiod and temperature. Temperature, pH, conductivity, dissolved oxygen and hatching of resting eggs were monitored for two weeks. The influence of the parameters on hatching in both treatments was evaluated using Hierarchical Partition Analysis.

Results: Hatching of resting eggs was higher in the Controlled condition than in the Natural one. Thirty percent of species observed in the active community after flooding hatched in the laboratory test. Conductivity, pH, and dissolved oxygen were positively correlated to the hatching of some species, e.g., Ephemeroporus hybridus, Leydigiops ornata, Notoalona sculpta and Ilyocryptus spinifer. The first species to hatch were those living associated with macrophytes and at low depths.

Conclusions: Our results show that stable temperature and photoperiod with similar light and dark hours stimulate greater hatching of Cladocera resting eggs. Variables such as pH, conductivity and dissolved oxygen were also correlated with the hatching of some species. We observed that the first contributions to activating the community after drought came from hatching of species usually associated with macrophytes and low depth conditions.

Keywords

dormant community, sediment, ephippium, flood plain, experiment

Resumo

Objetivo: Este estudo tem como objetivo verificar a contribuição dos ovos de resistência de cladóceros para as comunidades ativas de lagoas temporárias e testar experimentalmente as condições específicas para a eclosão destes ovos de resistência.

Métodos: Amostras de cladóceros foram obtidas em quatro lagoas temporárias na planície de inundação do rio Turvo (20° 22’S e 49° 16’W), na região noroeste do Estado de São Paulo, Brasil. Amostras de 5 cm de sedimento foram coletadas durante a estação seca, usando um corer de 4,5 cm de diâmetro. Amostras de plâncton foram coletadas antes e depois da estação seca. Para o teste de incubação, foram realizados dois tratamentos a saber, 1. Condições naturais - sem controle de luz e temperatura; 2. Condições controladas - com fotoperíodo e temperatura controlados. A condição da água e a eclosão dos ovos de resistência foram monitoradas por duas semanas. A influência dos parâmetros na eclosão em ambos os tratamentos foi avaliada por meio da Análise de Partição Hierárquica.

Resultados: A eclosão dos ovos de resistência foi maior no tratamento Condições controladas do que Condições naturais. Trinta por cento das espécies observadas na comunidade ativa após o alagamento eclodiram no teste de laboratório. Condutividade, pH e oxigênio dissolvido foram positivamente correlacionados com a eclosão de algumas espécies como Ephemeroporus hybridus, Leydigiops ornata, Notoalona sculpta e Ilyocryptus spinifer. As primeiras espécies a eclodirem foram aquelas associadas a macrófitas e em ambients com baixas profundidades.

Conclusões: Nossos resultados mostram que condições constantes de temperatura e fotoperíodo estimulam maior taxa de eclosão dos ovos de resistência de Cladocera. Variáveis como pH, condutividade e oxigênio dissolvido também foram correlacionados com a eclosão de algumas espécies estudadas. Observamos que as primeiras contribuições para a comunidade ativa após a seca vieram da eclosão de espécies geralmente associadas a macrófitas e condições de baixa profundidade.

Palavras-chave

comunidade dormente, sedimento, efípio, planície de inundação, experimento

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