Abstract
Annual fishes inhabit small temporary ponds that dry up seasonally. Survival in temporary ponds requires specific physiological, morphological, and/or life cycle adaptations. Annual fishes exhibit a complex reproductive strategy with resistant eggs to survive droughts. Here, we investigate the fecundity of the annual fishes Austrolebias cyaneus and Cynopoecilus nigrovittatus individually and in interaction in situ throughout the hydroperiod (early inundation, drying, and late inundation) of a temporary pond. The monospecific treatment of Austrolebias cyaneus showed no effect on fecundity regarding body size, weight, and flooding phase. In the monospecific treatment of Cynopoecilus nigrovittatus, there was a positive effect of female body size and sampling period on the number of eggs, which was higher in the late flooding phase. In the interspecific treatment, Austrolebias laid fewer eggs in the early flooding phase when compared to the monospecific treatment, and Cynopoecilus nigrovittatus showed a reduction in the number of eggs, considering the entire hydrological cycle. These results obtained from wild populations should help to fill the knowledge gap on biological traits, which impairs the understanding of the ecology of annual killifish in small temporary wetlands.
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The datasets generated during the current study are available from the corresponding author on reasonable request.
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This research was authorized by IBAMA/ICMBio (SISBIO process number 83141-1) and UNISINOS Ethic Committee (PPECEUA 12.2019).
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This research was supported by CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico (Grant numbers 165529/2020-2, 305475/2018-5). LM and CS hold Research Productivity Grants from CNPq.
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Vinicius Weber and Leonardo Maltchik: assisted with conceptualization, formal analysis, data curation, methodology, visualization, writing – original draft, writing – review & editing. Vinicius Weber, Robson Souza Godoy, Luis Esteban Krause Lanés and Pedro Henrique de Oliveira Hoffmann: assisted with experimental design, field and laboratory work and manuscript preparation and editing. Cristina Stenert: performed statistical analyses and prepared the manuscript. Leonardo Maltchik: assisted with funding acquisition, project administration and supervision. All authors read and approved the final manuscript.
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Weber, V., Godoy, R.S., Lanés, L.E.K. et al. Egg Production of Annual Fish Austrolebias cyaneus and Cynopoecilus nigrovittatus Occurs Throughout Their Entire Life Cycle to Survive in a Temporary Wetland. Wetlands 43, 97 (2023). https://doi.org/10.1007/s13157-023-01745-9
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DOI: https://doi.org/10.1007/s13157-023-01745-9