Taxonomic and phylogenetic β-diversity of regional assemblages of angiosperm species in relation to geographic and climatic determinants in Africa

IF 3.4 2区环境科学与生态学 Q2 ECOLOGY

Journal of Biogeography Pub Date : 2024-06-04 DOI:10.1111/jbi.14968

Hong Qian, Yi Jin, Tao Deng

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引用次数: 0

Abstract

Aim

Beta-diversity quantifies the change in taxonomic and phylogenetic composition between areas, and is a scalar between local (α) and regional (γ) diversity. Geographic distance, which reflects dispersal limitation, and climatic distance, which reflects environmental filtering, are major drivers of β-diversity. Here, we analyse a comprehensive data set of angiosperms in regional floras across Africa to assess the relationships of β-diversity, and its components, to three major types of environmental variables (current climate, Quaternary climate change and topographic heterogeneity) thought to drive β-diversity.

Location

Africa.

Taxon

Angiosperms.

Methods

Africa was divided into 27 regions. Species lists of angiosperms for each region were collated. The relationships of both taxonomic and phylogenetic β-diversity, and their respective turnover and nestedness components, with geographic and environmental distances were assessed.

Results

This study showed that (1) regions of the lowest β-diversity are located in moist tropical climates, (2) the turnover and nestedness components of β-diversity are negatively correlated with each other, (3) taxonomic β-diversity is higher than phylogenetic β-diversity across Africa, (4) variation in β-diversity of angiosperms is more strongly associated with current climate than with Quaternary climate change and topographic heterogeneity and (5) the variation in taxonomic β-diversity and its turnover component that is independently explained by geographic distance is much larger than that is independently explained by climatic distance for angiosperms in Africa.

Main Conclusions

The finding that geographic distance explained more variation than climatic distance suggests that dispersal limitation plays a greater role than environmental filtering in shaping angiosperm β-diversity in Africa. Of climatic factors, current climate plays a more important role than Quaternary climate change in shaping angiosperm β-diversity in Africa.

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与非洲地理和气候决定因素有关的被子植物物种区域组合的分类学和系统发育β多样性

β多样性量化了不同地区之间分类和系统发育组成的变化，是介于地方（α）和区域（γ）多样性之间的一个标量。反映扩散限制的地理距离和反映环境过滤的气候距离是β多样性的主要驱动因素。在此，我们分析了非洲地区植物区系中被子植物的综合数据集，以评估β多样性及其组成部分与被认为驱动β多样性的三大类环境变量（当前气候、第四纪气候变化和地形异质性）之间的关系。整理了每个地区的被子植物物种清单。研究评估了分类学和系统发育β多样性及其各自的更替和嵌套成分与地理和环境距离的关系。研究表明：(1) β 多样性最低的地区位于潮湿的热带气候中；(2) β 多样性的周转率和嵌套度成分相互负相关；(3) 在整个非洲，分类学 β 多样性高于系统发生学 β 多样性、(4) 与第四纪气候变化和地形异质性相比，被子植物 β 多样性的变化与当前气候的关系更为密切；(5) 就非洲被子植物而言，地理距离所独立解释的分类学 β 多样性及其更替成分的变化远远大于气候距离所独立解释的变化。地理距离比气候距离能解释更多的变异，这一发现表明，在形成非洲被子植物β多样性方面，扩散限制比环境过滤的作用更大。在气候因素中，当前气候比第四纪气候变化对非洲被子植物β多样性的影响更为重要。

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来源期刊

Journal of Biogeography 环境科学-生态学

CiteScore

7.70

自引率

5.10%

发文量

203

审稿时长

2.2 months

期刊介绍： Papers dealing with all aspects of spatial, ecological and historical biogeography are considered for publication in Journal of Biogeography. The mission of the journal is to contribute to the growth and societal relevance of the discipline of biogeography through its role in the dissemination of biogeographical research.