A recent global analysis of GenBank DNA sequences from amphibians and mammals indicated consistent poleward decrease of intraspecific genetic diversity in both classes. We highlight that this result was biased by not accounting for distance decay of similarity and reanalyse the datasets, revealing distinct latitudinal gradients in mammals and amphibians.

中文翻译：

---

遗传多样性的哪些纬度梯度？

最近对两栖类和哺乳动物的GenBank DNA序列进行的全局分析表明，两类物种内的种内遗传多样性均呈极向性下降。我们强调指出，此结果因不考虑相似性的距离衰减而有偏差，并重新分析了数据集，揭示了哺乳动物和两栖动物中独特的纬度梯度。