Age Composition of Summer Colonies in the Japanese House-dwelling Bat, Pipistrellus abramus"

摘要: Age structure of summer colonies in P. abrumus was studied by banding and counting dental annuli. Females less than two years age constituted the majority members relatively large-sized A B investigated banding-recaptur e method, whereas aider females, males more one year decreased rapidly. similar composition found large C population small D colony, whose structures were determined incremental lines dentine. The disappearance rate during period from weaning to E-29% females 85-96% males. low ratio is probably attributable their remaining nursery colony even after weaning, tolerance for scanty food severe weather. female three low, while that four five very high. After first life, male mortality appears be always higher one. That oldest males, suggests abramus a fairly short-lived species vespertilioni d bats.