Behavioral Ecology and Sociobiology

, Volume 40, Issue 2, pp 111–118

Polyandry and enhanced reproductive success in the harlequin-beetle-riding pseudoscorpion

  • J. A. Zeh

DOI: 10.1007/s002650050323

Cite this article as:
Zeh, J. Behav Ecol Sociobiol (1997) 40: 111. doi:10.1007/s002650050323


The growing molecular evidence that females of many species mate with several males calls for a critical reassessment of the selective forces which act to shape female mating tactics. In natural populations of the harlequin-beetle-riding pseudoscorpion, Cordylochernes scorpioides, females are polyandrous and typically produce mixed-paternity broods. Laboratory behavioral analyses and breeding experiments indicate that polyandry in this pseudoscorpion is an active strategy which increases female reproductive success. Females restricted to mating with a single male experienced a higher rate of embryo failure and produced significantly fewer offspring than either females mated to more than one male in the laboratory or females naturally inseminated in the field. Forced copulation, insufficient sperm from a single mating, male nutrient donations and variation in inherent male genetic quality cannot explain the greater number of nymphs hatched by polyandrous females in this study. Evidence suggests that, by mating with several males, C. scorpioides females may exploit postcopulatory mechanisms for reducing the risk and/or cost of embryo failure resulting from fertilization by genetically incompatible sperm.

Key wordsCordylochernesscorpioides Genetic incompatibility Polyandry Postcopulatory sexual selection Pseudoscorpion 

Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • J. A. Zeh
    • 1
  1. 1.Department of Ecology and Evolutionary Biology, Rice University, Houston, TX 77005–1892, USAUS

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