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Population Dynamics of the Brown Long Eared Bat (Plecotus Auritus) Occupying Bird Boxes in a Pine Forest Plantation in Central Spain

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

A population of Brown long-eared bats, Plecotus auritus, occupying bird boxes in a pine forest plantation of Central Spain was studied between May and November 1989. The sex ratio was biased to females in adults; in contrast, in the immatures males were more numerous. Females were, in general, more gregarious than males. A progressive increase in body mass was observed for each sex and all age classes, during the study period. Highest values were recorded prior to hibernation in November. Adult females had the highest body mass and juvenile males the lowest. It is suggested, that the differences observed between males and females, and between adults and juveniles for weight, sex ratio and gregariousness may be related to a higher rate of mortality in males during their first winter.

Affiliations: 1: Museo Nacional de Ciencias Naturales, U.E.I. Ecología Evolutiva, José Gutierrez Abascal, 2 28006 Madrid, Spain


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