Abstract
The importance of sexual selection for the evolution, dynamics and adaptation of organisms is well known for many species. However, the topic is rarely studied in marine plankton, the basis of the marine food web. Copepods show behaviors that suggest the existence of sexually selected traits, and recent laboratory experiments identified some selected morphological traits. Here, we use a ‘life history-based’ model of sex roles to determine the optimal choosiness behavior of male and female copepods for important copepod traits. Copepod females are predicted to be choosy at population densities typically occurring during the main breeding season, whereas males are not. The main drivers of this pattern are population density and the difference in non-receptive periods between males and females. This suggests that male reproductive traits have evolved mainly due to mate competition. The model can easily be parameterized for other planktonic organisms, and be used to plan experiments about sexual selection.
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Acknowledgments
Ken Anderson and Uffe Høgsbro Thygesen for help with error-functions; Sara Ceballos and Mie Hylstofte Sichlau for input data, and Øyvind Fiksen for discussions, as well as anonymous referees for constructive comments. J.H. was funded by a DFG Research Fellowship (grant number HE 6050/1-1).
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Communicated by Craig Osenberg.
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Heuschele, J., Eliassen, S. & Kiørboe, T. Optimal mate choice patterns in pelagic copepods. Oecologia 172, 399–408 (2013). https://doi.org/10.1007/s00442-012-2516-4
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DOI: https://doi.org/10.1007/s00442-012-2516-4