Climatic niche comparisons of eastern North American and eastern Asian disjunct plant genera
Climatic niche comparisons of eastern North American and eastern Asian disjunct plant genera
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DOI：
10.1111/geb.13504
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发表时间：
2022-04
影响因子：
6.4
通讯作者：
Anthony E. Melton;Matthew H. Clinton;Donald N. Wasoff;Limin Lu;Haihua Hu;Zhiduan Chen;K. Ma;D. Soltis;P. Soltis;J. Lenoir
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作者：
Anthony E. Melton;Matthew H. Clinton;Donald N. Wasoff;Limin Lu;Haihua Hu;Zhiduan Chen;K. Ma;D. Soltis;P. Soltis;J. Lenoir
目的东亚(EA)和北美东部(ENA)的植物区系虽然共有许多属，但它们的物种丰富度却截然不同。尽管它们的温带气候质量总体上相似，但EA的气候在空间上的异质性比ENA更大。在一些地区，空间环境异质性被发现在影响物种丰富度方面起着关键作用。在这里，我们检验了以下假设：(A)EA物种将比它们的ENA同类植物占据更大的气候生态位，(B)EA-ENA分离属的同类将占据统计上相等的气候生态位，以及(C)EA-ENA分离属的同类将占据比它们各自的地理环境预期更相似的气候生态位。对ENM预测的地理和生态广度进行了评估。对同属种对进行了生态位等价性和相似性检验，以确定分离属的物种是否经历了生态位保守性或多样性。结果在ENA中，EA物种往往比其近亲物种占据更大的气候生态位空间。超过三分之二的生态位比较表明，EA-ENA同源物种要么在这些更广泛的气候体系中占据相同的气候生态位空间，要么占据与预期相似的不等价生态位，这与它们的地理环境相似。主要结论EA物种往往占据更大的气候生态位，EA-ENA分离属的同种往往在其各自的分布中占据相同/相似的生态位空间，所占据的生态位的差异可能是由于它们各自的地理环境所致，这突显了生态位中性过程和生态位保守主义如何影响间断物种的分布。
AimWhile the floras of eastern Asia (EA) and eastern North America (ENA) share numerous genera, they have drastically different species richness. Despite an overall similarity in the quality of their temperate climates, the climate of EA is more spatially heterogeneous than that of ENA. Spatial environmental heterogeneity has been found to play a key role in influencing species richness in some regions. Here, we tested the following hypotheses: (a) EA species will occupy larger climatic niches than their ENA congeners, (b) congeners of EA‐ENA disjunct genera will occupy statistically equivalent climatic niches, and (c) congeners of EA‐ENA disjunct genera will occupy more similar climatic niches than expected by their respective physiographic context.LocationNorth America and Asia.Time periodPresent.Major taxa studiedSeed plants.MethodsPredictions generated by ecological niche models (ENMs) were compared for 88 species across 31 EA‐ENA disjunct genera. ENM predictions were assessed for geographic and ecological breadth. Tests for niche equivalency and similarity were performed for congeneric species pairs to determine if species of disjunct genera have experienced niche conservatism or divergence.ResultsEA species tend to occupy greater amounts of climatic niche space than their close relatives in ENA. Over two‐thirds of the conducted niche comparisons show that EA‐ENA congeners either occupy equivalent climatic niche space within these broader climatic regimes or occupy non‐equivalent niches that are as similar as expected given their physiographic contexts.Main conclusionsEA species tend to occupy larger climatic niches, and congeners of EA‐ENA disjunct genera tend to occupy equivalent/similar niche space within their respective distributions, with differences in occupied niches possibly due to their respective physiographic contexts, highlighting how niche‐neutral processes and niche conservatism may affect the distributions of disjunct species.