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【6h】Influence of Climate in Functional and Species Diversification in South African Pelargonium.

机译气候对南非天竺葵功能性和物种多样性的影响。

【摘要】With its more than 280 species Pelargonium is the third largest genus in the highly diverse Cape Floristic Region. Pelargonium is also well known by its morphological diversity: life form varies from geophytes and stem succulents to woody shrubs, with associated differences in stem structure and leaf architecture. Here I analyzed some of the ecological and historical factors that could have contributed to the large species and morphological diversification in the genus.;Biological diversity is generated and maintained through two main routes: niche based and neutral processes. In the niche based processes, the main focus of this work, niche differentiation and species divergence is product of a response to the biotic or abiotic environment. I specifically analyzed (1) if diversification in the genus has been accompanied by climate differentiation among closely related species; (2) the main climate drivers of species diversity in the genus and phylogenetic assemblage structure; (3) the role of species interactions on species accumulation pattern and; (4) how climate history might have influenced current ecological strategies in different Pelargonium clades.;I found that prevalence of intrasectional climate niche conservatism is clade dependent but generally low, suggesting that the steep climatic gradients in South Africa could have facilitated diversification in some Pelargonium clades. These differences in levels in climate niche conservatism among clades were parallel to divergent ecological strategies (drought avoidance vs. drought resistance). These strategies are most likely the result of adaptation to climate at early clade history and have facilitated diversification of each clade in its particular climate zone, but reduced success out of it.;Diversification in the genus was largely associated to a seasonal match of low environmental energy with high precipitation and therefore variation in species richness in Pelargonium did not follow the predictions of the species-energy hypothesis described for other regions. Geographical patterns of species richness closely matched phylogenetic assemblage structure and underlying assembly process; high prevalence of species interactions in the winter rainfall region and environmental filtering outside of it.;Approaches incorporating phylogenetic information, climate and species traits are a powerful tool to determine the historical factors behind generation of biodiversity.

【摘要机译】天竺葵拥有280多个物种,是高度多样化的开普植物区的第三大属。天竺葵还因其形态多样性而广为人知:生命形式从植物,多肉植物到木本灌木不等,茎结构和叶片结构也有所不同。在这里,我分析了可能造成该属大物种和形态多样化的一些生态和历史因素。生物多样性是通过两种主要途径产生和维持的:基于生态位的过程和中性过程。在基于生态位的过程中,这项工作的主要重点是生态位分化和物种分化是对生物或非生物环境作出反应的产物。我专门分析了(1)该属的多样性是否伴随着密切相关物种之间的气候分化; (2)属和系统发育组合结构中物种多样性的主要气候驱动因素; (3)物种相互作用对物种积累模式的作用; (4)气候史可能如何影响不同天竺葵进化枝的生态策略;进化枝。进化枝之间的生态位保守性水平的这些差异与不同的生态策略(避免干旱与抗旱性)平行。这些策略很可能是进化枝早期就适应气候的结果,并促进了每个进化枝在其特定气候区的多样化,但成功率却有所下降。;属的多样性很大程度上与低环境的季节匹配有关天竺葵具有较高的降水能量,因此天竺葵的物种丰富度没有遵循其他地区所描述的物种能量假说的预测。物种丰富度的地理模式与系统发育的组装结构和潜在的组装过程紧密匹配;冬季降雨区中物种相互作用的普遍性很高,并在其外部进行环境过滤。结合系统发育信息,气候和物种特征的方法是确定生物多样性产生的历史因素的有力工具。

【作者】Martinez Cabrera, Hugo I.;

【作者单位】University of Connecticut.;

【年(卷),期】2010(),

【年度】2010

【页码】84 p.

【总页数】84

【原文格式】PDF

【正文语种】eng

【中图分类】;

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