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Behavioral Ecology and Sociobiology

, Volume 69, Issue 12, pp 1907–1916 | Cite as

Mate choice and male–male competition among morphologically cryptic but genetically divergent amphipod lineages

  • Matthias Galipaud
  • Zoé Gauthey
  • Jérémie Turlin
  • Loïc Bollache
  • Clément Lagrue
Original Article

Abstract

Mate preference for conspecifics does not necessarily lead to assortative mating in cases where mating outcomes also depend on preferences based on mate quality and on individual competitiveness. We tested how such traits affected mate choice among genetically divergent lineages (called molecular operational taxonomic units; MOTU) of the amphipod Gammarus fossarum. We presented males with two females, including one from its own MOTU. Females also potentially differed in body size, and therefore fecundity, and in time before reproduction, two traits previously recognized as important in male mate choice. Males generally preferred females from their own MOTU when females originated from highly divergent MOTUs (17 % genetic divergence), but not when they were more closely related (3.5 % genetic divergence). Contrary to expectations, they did not prefer larger females, but they consistently paired with the female closest to reproduction. A second experiment involving duos of males of different MOTUs in competition for a female also revealed that males consistently won the competition over pairing with females of their own MOTU. Overall, these results reveal a strong influence of genetic divergence on mate recognition and reproductive isolation between sympatric MOTUs. However, male preference for females that are close to being available for reproduction also potentially results in hybridization among closely related MOTUs. We examine these results in the light of field mating patterns observed in a previous study of G. fossarum and discuss the importance of considering competitiveness and preferences for mate quality signals when studying evolutionary consequences of secondary contact between divergent lineages.

Keywords

Assortative mating Cryptic species Hybridization Male mate choice Mate quality signals Species recognition 

Notes

Acknowledgments

We thank Aude Balourdet and Christine Dubreuil for field assistance and Thierry Rigaud for insightful discussions on the project and manuscript. The manuscript was significantly improved by very constructive comments from two anonymous reviewers.

Funding

Clément Lagrue was funded by a postdoctoral grant from the regional council of Burgundy.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no competing interests.

Ethical approval

All applicable international, national and/or institutional guidelines for the care and use of animals were followed.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Matthias Galipaud
    • 1
  • Zoé Gauthey
    • 2
  • Jérémie Turlin
    • 3
    • 6
  • Loïc Bollache
    • 4
    • 6
  • Clément Lagrue
    • 5
  1. 1.Department of Evolutionary BiologyBielefeld UniversityBielefeldGermany
  2. 2.INRA, UMR 1224, Ecologie Comportementale et Biologie des Populations de PoissonsSaint-Pée sur NivelleFrance
  3. 3.UMR CNRS 6282 BiogéosciencesDijonFrance
  4. 4.Laboratoire Chrono-Environnement UMR CNRS 6249Université de Franche-ComtéBesançonFrance
  5. 5.Department of ZoologyUniversity of OtagoDunedinNew Zealand
  6. 6.Université de BourgogneDijonFrance

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