Quantification of microscopic feather characters used in the identification of North American plovers

Article Abstract:

A study examined the variation in plumulaceous barbs' microscopic characters in six species of Charadrius with the aim of quantifying characters and testing differences among taxa. Results found substantial difference among the barbs of four regions within each vane of a single feather although barbs from opposing vanes were not that different from one another. Findings also revealed two subgroups within Charadrius. The first sector comprises semipalmatus, vociferus and montanus while the other consists of wilsonia, alexandrinus and melodus.

Research, Plovers, Feathers

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Reproductive anatomy of the reed bunting: a species which exhibits a high degree of sperm competition through extra-pair copulations

Article Abstract:

The reed bunting is a socially monogamous passerine which exhibits a high level of sperm competition through extra-pair copulation. The reproductive anatomy of the reed bunting is described, in relation to the high degree of sperm competition. It is shown that the female tract shows adaptations linked to high levels of sperm competition, while the volume of cloacal protuberance and the weight of the testes of the male is larger than that in other species of comparable size.

Sexual behavior, Birds, Sexual behavior in animals, Animal sexual behavior, Animal anatomy, Emberiza, Buntings (Birds)

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