Data from: The static allometry of sexual and non-sexual traits in vervet monkeys

Sexual traits vary tremendously in static allometry. This variation may be explained in part by body size-related differences in the strength of selection. We tested this hypothesis in two populations of vervet monkeys, using estimates of the level of condition dependence for different morphological traits as a proxy for body size-related variation in the strength of selection. In support of the hypothesis, we found that the steepness of allometric slopes increased with the level of condition dependence. One trait of particular interest, the penis, had shallow allometric slopes and low levels of condition dependence, in agreement with one of the most consistent patterns yet detected in the study of allometry, namely that of genitalia exhibiting shallow allometries.

性特征的静态异速生长（static allometry）模式存在显著变异。此类变异可部分归因于与体型相关的选择强度差异。我们以两个黑长尾猴（vervet monkey）种群为研究对象，检验该假说：以不同形态性状的条件依赖（condition dependence）水平作为选择强度随体型变异的替代指标。结果支持该假说，即异速生长斜率的陡度随条件依赖水平的升高而增大。其中尤为受关注的阴茎性状，其异速生长斜率较为平缓且条件依赖水平较低，这与异速生长研究中已发现的最一致模式之一——即生殖器呈现平缓异速生长的模式——相符。