Song, sperm quality and testes asymmetry in the sedge warbler
Article Abstract:
The phenotype-linked fertility and directional asymmetry hypotheses of sexual behavior in birds were tested by analyzing the sedge warbler's testes size, song repertoire and sperm features in relation to its copulation practices. Results showed no relationship between the phenotype-linked fertility hypothesis and song repertoire size. Moreover, there was no evidence that directional asymmetry in testes size covaried with the song repertoire size.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1997
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Ejaculate quality and the success of extra-pair copulations in the zebra finch
Article Abstract:
The sperm velocity of the zebra finch differs substantially among males depending on the time elapsed since the last ejaculation. Extra-pair copulations enables the male partners to enhance both ejaculate quality and sperm number because it is after the period of own-pair copulations, leading to asymmetrically high fertilizations. The ejaculate quality differs due to variation of sperm quality inside the seminal glomera.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Genetic effects on sperm design in the zebra finch
Article Abstract:
An extraordinary degree of inter-male variation in sperm design that is independent of sperm swimming velocity is shown in the zebra finch Taeniopygia guttata. The sperm head, mid-piece and flagellum length are heritable, a negative genetic correlation exists between sperm traits, and significant indirect genetic effects exist, accounting for the variation in sperm phenotype between males.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
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