Abstract

BOTTO NUNEZ, Germán et al. Circannual sex distribution of the Brazilian free-tailed bat, Tadarida brasiliensis (Chiroptera: Molosssidae), suggests migration in colonies from Uruguay. Mastozool. neotrop. [online]. 2018, vol.25, n.1, pp.213-219. ISSN 0327-9383.

In the Northern Hemisphere, Tadarida brasiliensis is a migratory species, but there are no pub­lished data about its migration behavior in Uruguay. Using field data, we found significant and consistent seasonal variation in colony sex ratios across Uruguay. Males composed the majority of colonies sampled in Uruguay during the cold season, whereas females proportionally outnumbered males in these colonies during the warm season. Individuals present during the cold season remain active, and our evidence suggests females migrate out of Uruguay in winter. This is the first contribution to knowledge about circannual use of roosts by T. brasiliensis in Uruguay.

Keywords : Conservation; Pampas biome; Seasonal variation; South America.

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