Male sperm reserves and copulation frequency in birds

  title={Male sperm reserves and copulation frequency in birds},
  author={Timothy R. Birkhead and James V. Briskie and Anders Pape M\oller},
  journal={Behavioral Ecology and Sociobiology},
Male passerine birds store sperm in a cloacal protuberance during the breeding season. We consider three hypotheses to explain interspecific variation in relative cloacal protuberance size. The copulation efficiency hypothesis states that a relatively large cloacal protuberance facilitates sperm transfer and predicts more rapid copulation in species with larger protuberances. There is insufficient data to test this idea rigorously, but we found no evidence for such an effect. The spermatozoa… CONTINUE READING


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