A recent study by Saulsbury and colleagues assessed factors influencing growth coefficients in bivalves. Like many macroevolutionary studies that cover a wide range of taxa and environments, this study fails to account for important heterogeneity among taxa and among environments. Rankings of factors depend on the range of values sampled, patterns of allocation of energy to various competing functions, and whether taxa in any given clade are uniform in their growth coefficients. Heterogeneity is universal and must be taken into account in large-scale analyses.

中文翻译：

---

双壳类生长和异质性的看不见的手

Saulsbury 及其同事最近的一项研究评估了影响双壳类动物生长系数的因素。与许多涵盖广泛分类群和环境的宏观进化研究一样，这项研究未能解释分类群和环境之间的重要异质性。因素的排名取决于采样值的范围、能量分配给各种竞争功能的模式，以及任何给定进化枝中的分类群的生长系数是否一致。异质性是普遍存在的，必须在大规模分析中加以考虑。