Abstract
Organisms evolve to maintain fitness across generations, while short-term fitness in stochastic habitats such as temporary wetlands may be highly varied. As typical temporary wetland inhabitants, large branchiopods rely on bet hedging hatching that helps them survive throughout generations. An optimal hatching rate is predicted to be approximate to the successful reproduction probability (SRP). We tested the difference between hatching rate and SRP of large branchiopods Branchinella kugenumaensis and Eulimnadia braueriana in a temporary wetland in Taiwan, through field surveys and climatic records to evaluate their SRP. Comparisons were performed under two proposed scenarios, where a population’s hatching was bet hedged for a hydroperiod or for a wet season (with several hydroperiods), respectively. Population size fluctuations were simulated for these two scenarios under assumed egg mortalities and reproductive replenishments. Results showed that the hatching rates only fitted to SRP for E. braueriana under the scenario of bet hedging on a wet season, not for B. kugenumaensis, nor for both species under the scenario of bet hedging on a hydroperiod. Bet hedging on a wet season would have a smaller range of population size fluctuation and a lower rate of population size decrease. This implies that large branchiopods adopt a conservative hatching strategy, lowering the hatching fraction in each hydroperiod to reduce long-term egg bank size fluctuation. Bet hedging strategies could occur during other life cycle stages, coexist with other life history strategies, and lead to the diversified hatching fraction distribution rather than a single, optimal fraction throughout hydroperiods.
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Acknowledgements
We sincerely thank Dr. Jonathan Walter for providing statistical comments and Dr. Shiang-Lin Huang’s suggestions to the early draft. We are deeply grateful to two anonymous reviewers’ and the handling editor Dr. Nicole Phillips’ invaluable comments that have significantly broadened the scope and improved the quality of this study.
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CCW and DCR formulated the idea and wrote the draft. CCW developed the methodology and analyzed the data.
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Communicated by Nicole Phillips.
The datasets analyzed during the current study are available in the Google Drive (http://drive.google.com/open?id=1fi-4Clu46M4o-J7jqYlaJdWZQRJF9a-D). The climatic datasets analyzed during current study (i.e., precipitation and mean air temperature) are not publicly available due to the charge (only precipitation data available freely for the most recent ten years: http://www.cwb.gov.tw/V7/climate/dailyPrecipitation/dP.htm, Central Weather Bureau, Taiwan), but are available from the corresponding author on reasonable request.
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Wang, CC., Rogers, D.C. Bet hedging in stochastic habitats: an approach through large branchiopods in a temporary wetland. Oecologia 188, 1081–1093 (2018). https://doi.org/10.1007/s00442-018-4272-6
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DOI: https://doi.org/10.1007/s00442-018-4272-6