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Do the risks of predation and intermale competition affect courtship behavior in the salamander Desmognathus ochrophaeus?

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Summary

Natural populations of mountain dusky salamanders, Desmognathus ochrophaeus (Amphibia: Caudata: Plethodontidae), may experience two types of risk during courtship encounters: interspecific predation, affecting both sexes, and intraspecific competition for mates, affecting males. We conducted two experiments in the laboratory to determine whether and how these two risks influence the outcome of male-female encounters. In experiment 1, courtship interactions resulting in spermatophore deposition were inhibited in the presence of a restrained species of salamander (Gyrinophilus porphyriticus) known to prey on D. ochrophaeus. Probability of successful courtship was not affected by the presence of a restrained species that is not predatory (Plethodon teyahalee). In experiment 2, courtship interactions resulting in spermatophore deposition were inhibited in the presence of two restrained conspecific males, but were unaffected in the presence of a single restrained male. We conclude that the dual risks of predation and intrasexual competition for mates have been significant selective factors in shaping the evolution of courtship decisions in Desmognathus ochrophaeus.

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Authors and Affiliations

  1. Department of Ecology and Evolution, University of Chicago, 940 East 57th Street, 60637, Chicago, IL, USA

    Kerry Uzendoski

  2. Hope College, 49423, Holland, MI, USA

    Esther Maksymovitch

  3. Department of Zoology, Washington State University, 99164, Pullman, WA, USA

    Paul Verrell

Authors
  1. Kerry Uzendoski
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  2. Esther Maksymovitch
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  3. Paul Verrell
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Correspondence to: P. Verrell

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Uzendoski, K., Maksymovitch, E. & Verrell, P. Do the risks of predation and intermale competition affect courtship behavior in the salamander Desmognathus ochrophaeus? . Behav Ecol Sociobiol 32, 421–427 (1993). https://doi.org/10.1007/BF00168826

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