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Summary. - In 2000-2001 I investigated sexual segregation in Myotis daubentonii from the Abruzzo (central Italy) population. I captured 133 bats at sites respectively below 880 and above 970 m a.s.l. Females only occurred below 880 m, while males were observed at all sites but were less frequent than expected below 880 m a.s.l. and occurred more than expected above 970 m a.s.l. Of four day roosts examined, the one above 970 m a.s.l. was occupied by males only, while bats from both sexes were captured at those at lower altitudes. A few bats from both sexes were captured at a night roost below 880 m a.s.l. The% Body Condition Index (BCI) was compared between adult males from below 880 m and above 970 m a.s.l. In April-June males from low-elevation sites showed a higher BCI, but no difference occurred in August. The upper elevational limit for females in Italy lies at a higher altitude (ca. 900-950 m a.s.l.) than that recorded in northern Europe. The possible mechanisms (physiological constraints and competition between sexes) leading to sexual segregation in M. daubentonii and in other bat species are discussed. Resume. - En 2000-2001, j'ai etudie la segregation sexuelle au sein d'une population de Myotis dciubentonii des Abruzzes (Italic centrale). J'ai capture 133 sujets en des sites respectivement situes en dessous de 880 m et au-dessus de 970 m. Les femelles ont ete reperees au dessous de 880 m alors que les males ont ete notes sur tous les sites. Ils se sont toutefois averes moins frequents que pouvait s'y attendre en dessous de 880 m, et plus frequents au-dessus de 970 m. Panni les quatre refuges localises, celui situe au-dessus de 970 m etait seulement occupe par des males; alors que des sujets des deux sexes ont ete captures dans ceux de basse altitude. Quelques sujets des deux sexes ont ete captures dans un gite nocturne au dessous de 880 m. II a ete en outre procede a une comparaison entre Tlndice de Condition Corporelle (I.C.C.) des males captures sous 880 m et celui de ceux captures au-dessus de 970 m. En avril-juin, les males des altitudes inferieures temoignaient d'un ICC plus eleve, mais cette difference n'a pas ete observee en aout. En Italic, la limite altitudinale superieure (900-950 m) des femelles est superieure aux valeurs relevees en Europe du Nord. Les possibles mecanismes (contraintes physiologiques et competition inter-sexes) qui conduisent a la segregation sexuelle chez M. daubentonii et autres especes de chiropteres sont l'objet de discussion.

Elevation affects the distribution of the two sexes in Daubenton’s bats Myotis daubentonii (Chiroptera: Vespertilionidae) from Italy