Norconk Marilyn A
Department of Anthropology, University of California, Davis, California.
Am J Primatol. 1990;21(2):159-170. doi: 10.1002/ajp.1350210208.
Mixed-species troops composed of two species of tamarin monkeys, and rarely other ceboids, occur throughout much of western Amazonia and are notable for their long-term stability. This study identified several variables that appeared to promote mixed-species troop cohesion and yet maintained spatial segregation between species. Three variables enhanced in terspecific spatial segregation: differences in support use, vertical stratification, and interindividual spacing. In contrast, early morning vocalizations and well-coordinated movement patterns contribute to cohesion within a mixed-species troop. The combination of these variables may help explain how two congeneric species accommodate one another with little apparent interspecific aggression. The exact nature of benefits and costs to each individual in a mixed troop is still elusive; however, a comparison of population densities of sympatric and allopatric tamarins suggests that population growth of one partner (Saguinus fuscicollis) is enhanced in the presence of a congeneric species.
由两种狨猴组成的混合物种群体，很少有其他卷尾猴类，在亚马逊河西部大部分地区都有出现，并且以其长期稳定性而闻名。本研究确定了几个似乎能促进混合物种群体凝聚力但又能维持物种间空间隔离的变量。三个变量增强了种间空间隔离：支撑物使用的差异、垂直分层和个体间间距。相比之下，清晨的鸣叫和协调良好的运动模式有助于混合物种群体内部的凝聚力。这些变量的组合可能有助于解释两个同属物种如何在几乎没有明显种间攻击的情况下相互适应。混合群体中每个个体的收益和成本的确切性质仍然难以捉摸；然而，对同域和异域狨猴种群密度的比较表明，在有同属物种存在的情况下，一个伙伴（棕颈狨）的种群增长会得到增强。
