Reproductive Ecology and Social Dynamics in Nursery Colonies of the Natterer′s bat Myotis nattereri bombinus

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  • Reproductive Ecology and Social Dynamics in Nursery Colonies of the Natterer's bat Myotis nattereri bombinus.
  • Reproductive Ecology and Social Dynamic

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Reproduction and social organization of nursery colonies of M. n. bombinus were investigated by the banding-recapture method for long periods. Maternity colonies were composed almost entirely of pregnant females. Females reached sexual maturity in the first autumn. They produce annually one young per litter, and most of them continued every year until the age of seven. The reproductive rate in yearling females was as high as 90.5%, while that per year in all adult females more than one year of age averaged 88.8%. Females tended to return to their natal sites in successive years, though first-year returns were 50.2% for yearling females. Such a low returning rate indicates high mortality or dispersal rate for the first year of life. The returning or survival rate of adult females was remarkably high. There was little individual exchange among nursery colonies ; only 9.5% of adult females were immigrants. Thus, the primary unit of the nursery colony is related female groups coming of maternal lines.

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