Altrichter M, Drews C, Carrillo E, Sáenz J
Programa Regional en Manejo de Vida Silvestre, Universidad Nacional, Apartado 1350-3000 Heredia, Costa Rica.
Rev Biol Trop. 2001 Mar;49(1):383-9.
White-lipped peccaries are non-seasonal breeders in South America, but little is known about their reproduction in Central America. There are few studies about the sex ratio of this species in the field. We studied the reproduction and sex ratio of white-lipped peccaries during 200 hours of field observation of four radiomarked and two unmarked herds, from July 1996 to April 1997, in Corcovado National Park, Costa Rica. Sex ratio data of three additional, radiomarked herds observed in 1998 were also included. We recorded numbers of mountings, presence of newborns and numbers of nursing interactions. The peccaries showed a distinct reproductive seasonality, with one mating peak in February and another in July. The greatest number of newborns and the peak in nursing activity were observed during July and August, when fruit availability for the peccaries was high. The adult sex ratio was significantly female biased (1.4:1-1.8:1), also in contrast with South American populations.
白唇西貒在南美洲是非季节性繁殖动物，但人们对它们在中美洲的繁殖情况知之甚少。关于该物种在野外的性别比例的研究很少。1996年7月至1997年4月，我们在哥斯达黎加的科科瓦多国家公园对4个佩戴无线电项圈的兽群和2个未佩戴项圈的兽群进行了200小时的野外观察，研究了白唇西貒的繁殖情况和性别比例。还纳入了1998年观察到的另外3个佩戴无线电项圈兽群的性别比例数据。我们记录了交配次数、新生幼崽数量和哺乳互动次数。西貒表现出明显的繁殖季节性，2月和7月各有一个交配高峰。在7月和8月，观察到的新生幼崽数量最多，哺乳活动也达到高峰，此时西貒可获取的果实数量很多。成年西貒的性别比例显著偏向雌性（1.4:1至1.8:1），这也与南美洲的种群情况不同。
