Leighty Katherine A, Byrne Gayle, Fragaszy Dorothy M, Visalberghi Elisabetta, Welker Christian, Lussier Isabelle
Department of Psychology, University of Georgia, Athens, GA 30602-3013, USA.
Folia Primatol (Basel). 2004 Jan-Feb;75(1):14-8. doi: 10.1159/000073425.
We calculated the rate of twinning across four captive collections of tufted capuchins (Cebus apella) to be 2.4%. This rate contrast with previous reports that twinning in tufted capuchins is rare. Additionally, we present data on the survival and weight gain of twins in this species as compared to singletons. Twins face their greatest risk of mortality on or before the first day of life, when 45% will die compared to 16% of singletons. After the first day of life, twins and singletons demonstrate comparable survival rates. This, in conjunction with the finding that at no time during the first year of life do twins and singletons differ significantly in their weights, suggests that twinning is a viable reproductive form for these animals, especially in the captive setting where nutritional demands are met.
我们计算出圈养的簇绒卷尾猴（Cebus apella）四个种群的双胞胎出生率为2.4%。这一比率与之前关于簇绒卷尾猴双胞胎罕见的报道形成对比。此外，我们还提供了该物种双胞胎与单胎的存活情况及体重增加的数据。双胞胎在出生当天或之前面临着最大的死亡风险，此时45%的双胞胎会死亡，而单胎的这一比例为16%。出生一天后，双胞胎和单胎的存活率相当。这一点，再加上在出生后的第一年里，双胞胎和单胎的体重在任何时候都没有显著差异这一发现，表明双胞胎对于这些动物来说是一种可行的繁殖形式，尤其是在营养需求能够得到满足的圈养环境中。
