The diversity of brood size across animal species exceeds the diversity of most other life‐history traits. In some environments, reproductive success increases with brood size, whereas in others it increases with smaller broods. The dominant hypothesis explaining such diversity predicts that selection on brood size varies along climatic gradients, creating latitudinal fecundity patterns. Another hypothesis predicts that diversity in fecundity arises among species adapted to different microhabitats within assemblages. A more recent hypothesis concerned with the consequences of these evolutionary processes in the era of anthropogenic environmental change predicts that low‐fecundity species might fail to recover from demographic collapses caused by rapid environmental alterations, making them more susceptible to extinctions. These hypotheses have been addressed predominantly in endotherms and only rarely in other taxa. Here, we address all three hypotheses in amphibians globally.

中文翻译：

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两栖动物育雏规模的全球宏观生态学揭示了低繁殖力物种容易灭绝的倾向

跨动物物种的育雏规模的多样性超过了大多数其他生活史特征的多样性。在某些环境中，繁殖成功随着亲鱼大小的增加而增加，而在另一些情况下，繁殖成功随着亲鱼的大小而增加。解释这种多样性的主要假设预测，育雏量的选择会随气候梯度而变化，从而产生纬度繁殖力模式。另一个假设预测，在适应组合中不同微生境的物种之间会出现繁殖力多样性。关于人为环境变化时代这些进化过程的后果的最新假说预测，低繁殖力物种可能无法从快速环境变化导致的人口崩溃中恢复过来，从而使其更容易灭绝。这些假设主要在吸热中得到解决，而在其他生物分类中却很少得到解决。在这里，我们解决全球两栖动物的所有三个假设。