Male attacks on infants and infant death during male takeovers in wild white-headed langurs(Trachypithecus leucocephalus)  

作　　者：Lijie YIN Tong JIN Kunio WATANABE Dagong QIN Dezhi WANG Wenshi PAN 

机构地区：[1]Center for Nature and Society,School of Life Sciences,Peking University,Beijing,China [2]Chongzuo Biodiversity Research Institute,Peking University,Chongzuo,Guangxi,China [3]Primate Research Institute,Kyoto University,Japan [4]The Nature Conservancy,China Program,Kunming,Yunnan,China

出　　处：《Integrative Zoology》2013年第4期365-377,共13页整合动物学（英文版）

基　　金：financially supported by the 985 Project of Peking University and MEXT gCOE(A06 to Kyoto University).

摘　　要：Infanticide was first observed in langurs nearly 50 years ago,and this rare phenomenon has been inferred to have either an evolutionarily adaptive function or to be a pathological and non-functional behavior.In this study,we report 5 male takeover events in one-male groups of white-headed langurs in the Nongguan Karst Hills,Guangxi,China from 1998 to 2006.We recorded 13 attacks on 9 infants by extra-group males or new resident males.During the male takeovers,all of the infants younger than 6 months(with an average age of 3.6 months[N=11])in the groups disappeared.The infant death rate during the 4.2 months after takeover by a new male was significantly higher than the infant death rate calculated for most of the year.Older infants that were still nursing(with an average age of 14.1 months[N=7])were often attacked and seriously wounded by the extra-group males or new resident males,but all of them survived.The interbirth intervals of females whose infants were assumed to be killed by males were significantly reduced relative to those of females in groups with stable male tenure(mean=10 months vs 25 months).Our data suggest that males kill unrelated and unweaned infants during the takeover period to decrease the time until the infants’mothers resume fertility.Thus,infanticide would support sexual selection theory in white-headed langurs.The data also show that infanticidal behavior was directed toward the infants,especially those who were still nursing.Female dispersal may function as a counter-strategy to avoid infanticide.

关 键 词：INFANTICIDE male takeover sexual selection hypothesis Trachypithecus leucocephalus whiteheaded langur 

分 类 号：R72[医药卫生—儿科]