Dear Colleagues: On behalf of myself and my co-authors, I am pleased to announce the publication of our research article about breeding trips of South American sea lions: TRAVEL FOR SEX: LONG RANGE BREEDING DISPERSAL AND WINTER HAULOUT FIDELITY IN SOUTHERN SEA LION MALES Giardino, Gisela V.; Mandiola, M. Agustina; Bastida, Julián; Denuncio, Pablo E.; Bastida, Ricardo O. and Diego Rodriguez (2016) *Mammalian Biology - Zeitschrift für Säugetierkunde* vol. 81 (1) p. 89-95 Abstract Southern sea lions (*Otaria flavescens*; SSLs) have a polygynous mating system and a prolonged social-sexual maturation period for males. Male haulouts are common in this species, with some very distant from central breeding rookeries, although the functions of these aggregations are not clearly understood. To estimate the potential connectivity between northern Argentina male colonies and breeding rookeries in Patagonia and Uruguay, we monitored the summer breeding activities and winter presence of 559 individually identified SSL males from haulouts in Mar del Plata and Quequén harbors. Our results confirm that male groups are formed by sexually active sea lions that show a strong annual connection with distant (up to 700 km) breeding colonies. Circa 70% of the marked males made long-distance round-trips (72 ± 26.7 days; *n* = 325) from northern Argentina to Patagonia and Uruguay, indicating a high degree of winter site fidelity. Mating activity was confirmed for 53% of the sea lions re-sighted in breeding colonies, with approximately 80% of them having central positions on the beach and holding harems of up to nine females. The chronology of this cycle is finely tuned with the onset of the breeding season, which may result in comparative advantages such as anticipating female arrival or a prolonged participation in mating activities. Our results suggest a model of male haulouts spatially segregated from the central breeding areas, but with a summer recurrent flow of animals that contributes a significant proportion of the male population of northern Patagonia and Uruguay. Keywords - *Otaria flavescens*; - Pinnipeds; - Sea lions; - Connectivity; - Mating system; - Male hauling grounds; - Argentina; - Marking; - Spatial segregation Articles available at http://www.sciencedirect.com/science/article/pii/S1616504714001293 or by email: oflavescens@gmail.com Cheers and good 2006! Gisela -- Dra. Gisela Giardino Lab. Biol., Ecología y Conserv. de Mamíferos Marinos Universidad Nacional de Mar del Plata (UNMdP) Deán Funes 3350, (7600) Mar del Plata, Argentina. Tel: +54 223 4752426 (int. 456) Casilla de Correo 1260-Correo Central-MdP http://travesiasdelobos.blogspot.com/ https://www.facebook.com/groups/136323163081610/ https://twitter.com/travesiasdelobo