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Marine Biology

, Volume 156, Issue 3, pp 269–275 | Cite as

The effect of size and cheliped autotomy on sexual competition between males of the mud crab Cyrtograpsus angulatus Dana

  • Pedro DaleoEmail author
  • Tomás Luppi
  • Agustina Mendez Casariego
  • Mauricio Escapa
  • Pablo Ribeiro
  • Paola Silva
  • Oscar Iribarne
Original Paper

Abstract

Size advantage in male–male competition over mates, combined with male preference over large females, is a common feature that can drive to size assortative mating and, eventually, sexual selection. In crabs, appendage autotomy can affect assortative mating and opportunity for sexual selection by affecting size advantage in mating contests. In this work, we evaluate the effect of size and appendage autotomy in generating assortative mating in the mud crab Cyrtograpsus angulatus. Field observations of guarding pairs in two different populations show a positive correlation between carapace width of males and females in both the populations. In one of the populations, incidence of appendage autotomy was low and the variability in the size of reproductive males was lower than the variability in the size of randomly collected males (i.e. only larger males were successful in getting a female), whereas there was no differences in the other population (i.e. most male sizes were successful) where the incidence of appendage autotomy was very high, indicating that the importance of size is higher when the incidence of autotomy is low. In this context, experiments (in both populations) show that, in contests for a female, larger males outcompete smaller ones only when they had intact appendages. When males had missing chelipeds, winning or loosing against smaller males was random. This may lead to a decrease in the importance of male size in populations with high incidence of cheliped autotomy, affecting assortative mating and opportunity for selection and, thus, affecting selective pressures.

Keywords

Mating Success Assortative Mating Large Male Small Male Large Female 

Notes

Acknowledgments

We thank Juan Alberti, three anonymous reviewers and the editor, Dr. Maria Byrne for helpful comments on the manuscript. This project was supported by the Universidad Nacional de Mar del Plata, the Fundacion Antorchas (Argentina; A013672 and 13900-13) and CONICET (Argentina PIP2851), ANPCyT (Argentina PICT13527); all granted to O.I. P.D., A.M.C., M.E. and P.R. were supported by Doctoral scholarship from CONICET (Argentina).

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Pedro Daleo
    • 1
    • 2
    Email author
  • Tomás Luppi
    • 1
    • 2
  • Agustina Mendez Casariego
    • 1
    • 2
  • Mauricio Escapa
    • 2
    • 3
  • Pablo Ribeiro
    • 1
    • 2
  • Paola Silva
    • 1
    • 2
  • Oscar Iribarne
    • 1
    • 2
  1. 1.Departamento de Biología (FCEyN)Universidad Nacional de Mar del PlataMar del PlataArgentina
  2. 2.Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Buenos AiresArgentina
  3. 3.Instituto Argentino de Oceanografía (IADO)Bahía BlancaArgentina

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