Numerous studies have assessed whether species niches are conserved in geographically separated regions. However, most of them were performed on invasive species, with the limitation that such species have likely not yet reached their potential distribution in the invaded region. Here we test the hypothesis of niche conservatism in the entire group of 25 amphitropical desert disjunct plant species, naturally distributed in North and South America but absent in the tropics. We also assessed the influence of ecological (intensity of biotic interactions) and species‐specific factors (dispersal ability and adaptation to stress) on species niche differentiation between the two continents.

中文翻译：

---

两栖沙漠分离植物的生态位动态：寻求生态和物种特定的影响

大量研究评估了在地理上分开的区域中物种壁ches是否得到保护。然而，它们中的大多数是对入侵物种进行的，其局限性在于此类物种可能尚未在入侵地区达到其潜在的分布。在这里，我们测试了全部25种两亲性沙漠分离植物物种中生态位保守性的假设，这些物种自然分布于北美和南美，但在热带地区却不存在。我们还评估了生态学（生物相互作用的强度）和物种特异性因素（分散能力和对压力的适应性）对两大洲物种生态位分化的影响。