Exceptions to the quasi‐ubiquitous latitudinal diversity gradient (LDG) have been poorly studied. A reverse LDG, when species richness (SR) increases away from the Equator, has been suggested for several taxa and entire biomes. The Neotropical seasonally dry tropical forests (SDTF) are a well‐known example of a reverse LDG that could be caused by the climatic stability of Pleistocene Refugia and dispersion from distinct source areas. Here, we test these predictions under a spatial and phylogenetic framework.

中文翻译：

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新热带地区季节性干旱森林的系统发育多样性和结构

准泛滥的纬度分集梯度（LDG）的例外研究很少。当物种丰富度（SR）远离赤道增加时，已经提出了反向LDG，它适用于几个分类群和整个生物群落。新热带季节性干燥热带森林（SDTF）是反向LDG的一个著名例子，它可能是由更新世避难所的气候稳定性和来自不同来源地区的扩散引起的。在这里，我们在空间和系统发育框架下测试这些预测。