Beha Vior of Elephant Seals
نویسنده
چکیده
Ct'tte etudt· porte sur certaines differenccs de comportements qui se sont etablies dcpuis que deux especes d'elephants dc mer se sont trouvees isolees, il la fin de la dernil'!re grandc glaciation. Les elephants de mer (Mirounga leonina) mAles, observes sur la Peninsule Valdes cn Argt'ntinc cmettent dcs cris de menace differentS de ceux des ele phants dc mer de I 'hemisphere boreal (M. angustirostris). Les appels de !'ele phant de mer austral sont emis a des intervalles et a hauteur variables et durent en moyenlle 19 secondes. Au contra ire, ceux de I'cspece boreale, emettent line serie rcgulierc dc sons qui durent raremcnt plus de 6 secondes. Les femelles dc l'espece australe sont largement reparties sur la Pcnlnsule Valdes et ne se groupent pas aussl facilement en harem quc Ie font les femelles de la mcme cspcce appartenant a d'autres colonies au celles de l'espece boreale. Aussi, Ics comportements tels que les rencontrcs agonlstiques entre femelles, I('s cris dcs meres appelant leur jeune, les appels des jcunes, les separations nH�re-jcunc ct les cas de mortalite chez les jeunes sont mains frequents que dans les aut res colonies des deux especes. I.e grollpcmcnt plus IAche des femelles d'elephants de mer a l'interleur de la colonic litudiee iei est peut-Hrc dft a l'abondance des plages propices a la reproduction dans cctte region. Les intcrvalJes entre peri odes de reproduction sont remarquablement Iden tiques pour Ics deux cspeces considerees, bien que les epoques solent deplacees en fonction des conditions climatiques locales.
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From Normal Brain and Beha Vior to Schizophrenia
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تاریخ انتشار 2011