Forced copulation results in few extrapair fertilizations in Ross's and lesser snow geese

Article Abstract:

In many species of monogamous birds, extrapair paternity can account for 0-70% of young. Previous studies suggest that the variation is linked to nesting density, the proportion of extrapair copulations and breeding synchronization. A new study of lesser snow geese and Ross's geese investigates extrapair paternity and the relative fertilization success of forced extrapair copulations. The study shows extrapair paternity is not related to nesting density, but, in snow geese, is likely to occur in nests of females nesting asynchronously. Details of the study are presented.

Sexual behavior, Natural history, Snow goose, Snow geese, Animal behavior, Nunavut, Geese

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Reply to Moller

Article Abstract:

A reply to an article that critiques a review of a study that explored the seasonal variation of the size of avian breeding territories is presented. Clarification on the use of severalhypotheses to explain the variation in size of the avian breeding territories is presented. The seasonal variation of the size of breeding territories may not be due to the male bird's territorial behavior to protect the mate from extra-pair fertilization.

Spatial behavior in animals, Animal spatial behavior

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Fighting behaviour and strategy of rock pipit, Anthus petrosus, neighbours: cooperative defence

Article Abstract:

A study of the cooperative defence mechanisms of rock pipits, Anthus petrosus, is designed to test the hypothesis that it is beneficial for such birds to cooperate in defending their neighbour's territory. The study of rock pipit's fighting behaviour shows that established, territorial neighbours cooperate to evict intruders.

Observations, Altruistic behavior in animals, Animal altruistic behavior

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