Individual variation in predation on fur seals by southern sea lions (Otaria byronia) in Peru

摘要: Southern sea lions (Otaria byronia) were observed to prey on juvenile and adult female South American fur seals (Arctocephalus australis) at Punta San Juan, Peru (15°22′S, 75°12′W) between October 1987 December 1988. Over the course of study there 165 attacks with 33 killed. While both male subadult captured killed seals, never acted aggressively towards seals. Adult males attacked 82.4% occasions when they present rookery, subadults 52% occasions. Distinctive pelage characteristics allowed some be individually identified, differences in hunting success adults subadults, five identifiable who hunted least Motivation for differed adults, using as lion substitutes, guarding them from others cop...