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Climatic niche lability but growth form conservatism in the African woody flora
Ecology Letters ( IF 7.6 ) Pub Date : 2022-03-01 , DOI: 10.1111/ele.13985
Anaïs-Pasiphaé Gorel 1 , Olivier J Hardy 2 , Gilles Dauby 3 , Kyle G Dexter 4, 5 , Ricardo A Segovia 6, 7 , Kathy Steppe 1 , Adeline Fayolle 8
Affiliation  

Climatic niche evolution during the diversification of tropical plants has received little attention in Africa. To address this, we characterised the climatic niche of >4000 tropical African woody species, distinguishing two broad bioclimatic groups (forest vs. savanna) and six subgroups. We quantified niche conservatism versus lability at the genus level and for higher clades, using a molecular phylogeny of >800 genera. Although niche stasis at speciation is prevalent, numerous clades individually cover vast climatic spaces suggesting a general ease in transcending ecological limits, especially across bioclimatic subgroups. The forest biome was the main source of diversity, providing many lineages to savanna, but reverse shifts also occurred. We identified clades that diversified in savanna after shifts from forest. The forest-savanna transition was not consistently associated with a growth form change, though we found evolutionarily labile clades whose presence in forest or savanna is associated respectively with climbing or shrubby species diversification.

中文翻译:

非洲木本植物的气候生态位不稳定性但生长形式保守

热带植物多样化过程中的气候生态位演化在非洲很少受到关注。为了解决这个问题,我们描述了超过 4000 种热带非洲木本物种的气候生态位,区分了两个广泛的生物气候组(森林与稀树草原)和六个亚组。我们量化利基保守主义使用> 800个属的分子系统发育,在属水平和更高进化枝上的不稳定性。尽管物种形成的生态位停滞很普遍,但许多进化枝单独覆盖了广阔的气候空间,这表明在超越生态限制方面通常很容易,特别是在生物气候亚群之间。森林生物群系是多样性的主要来源,为稀树草原提供了许多谱系,但也发生了逆转。我们确定了从森林转移后在稀树草原中多样化的进化枝。尽管我们发现在森林或稀树草原中存在的进化不稳定的进化枝分别与攀援或灌木物种多样化有关,但森林-稀树草原的过渡并不总是与生长形式变化相关联。
更新日期:2022-03-01
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