Clarke Margaret R, Zucker Evan L, Scott Norman J
Department of Psychology, Loyola University, New Orleans, Louisiana.
U.S. Fish and Wildlife Service, Denver Wildlife Research Center, Museum of Southwestern Biology, University of New Mexico, Albuquerque, New Mexico.
Am J Primatol. 1986;11(1):79-88. doi: 10.1002/ajp.1350110108.
A complete survey of La Pacifica in Guanacaste Province, Costa Rica was conducted in July 1984 in order to determine whether the howler (Alouatta palliata) population had declined since 1972 as a result of deforestation. During the 6-day survey, 257 howlers were located, representing 16 different social groupings and nine solitary animals. The total number of howlers, the number and location of groups, and the age-sex composition were very similar to a 1972-1976 survey of the same population. Age-sex composition of La Pacifica howler groups was similar to those of another population of mantled howlers in Costa Rica and of populations in Mexico and in Panama, although La Pacifica had a higher mean number of adult females per group. There was no evidence to support the hypothesis that the La Pacifica howler population has declined in recent times.
1984年7月，对哥斯达黎加瓜纳卡斯特省的拉帕西菲卡地区进行了一次全面调查，以确定吼猴（Alouatta palliata）种群数量自1972年以来是否因森林砍伐而减少。在为期6天的调查中，共发现了257只吼猴，分属于16个不同的社会群体以及9只独居的吼猴。吼猴的总数、群体数量和位置，以及年龄性别构成，都与1972 - 1976年对该种群的调查非常相似。拉帕西菲卡吼猴群体的年龄性别构成与哥斯达黎加另一种长毛吼猴种群以及墨西哥和巴拿马的种群相似，不过拉帕西菲卡地区每组成年雌性吼猴的平均数量更多。没有证据支持拉帕西菲卡吼猴种群数量近期有所下降这一假设。
