Selection on sperm morphology under relaxed sperm competition in a wild passerine bird.

@article{Calhim2008SelectionOS,
  title={Selection on sperm morphology under relaxed sperm competition in a wild passerine bird.},
  author={S Calhim and Anders Taranr{\o}d Braa and Tore Slagsvold and Tim R Birkhead},
  journal={Biology letters},
  year={2008},
  volume={5 1},
  pages={
          58-61
        }
}
Theories regarding the role of sexual selection on the evolution of sperm traits are based on an association between pre-copulatory (e.g. female preference) and post-copulatory (e.g. ejaculate quality) male reproductive traits. In tests of these hypotheses, sperm morphology has rarely been used, despite its high heritability and intra-individual consistency. We found evidence of selection for longer sperm through positive phenotypic associations between sperm size and the two major female… CONTINUE READING
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