Spatial patterns and climatic drivers of phylogenetic structure of regional liverwort assemblages in China.

IF 3.6 2区 生物学 Q1 PLANT SCIENCES Annals of botany Pub Date : 2024-08-22 DOI:10.1093/aob/mcae080
Hong Qian, Alain Vanderpoorten, Zun Dai, Michael Kessler, Thibault Kasprzyk, Jian Wang
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Abstract

Background and aims: Latitudinal diversity gradients have been intimately linked to the tropical niche conservatism hypothesis, which posits that there has been a strong filter due to the challenges faced by ancestral tropical lineages to adapt to low temperatures and colonize extra-tropical regions. In liverworts, species richness is higher towards the tropics, but the centres of diversity of the basal lineages are distributed across extra-tropical regions, pointing to the colonization of tropical regions by phylogenetically clustered assemblages of species of temperate origin. Here, we test this hypothesis through analyses of the relationship between macroclimatic variation and phylogenetic diversity in Chinese liverworts.

Methods: Phylogenetic diversity metrics and their standardized effect sizes for liverworts in each of the 28 regional floras at the province level in China were related to latitude and six climate variables using regression analysis. We conducted variation partitioning analyses to determine the relative importance of each group of climatic variables.

Key results: We find that the number of species decreases with latitude, whereas phylogenetic diversity shows the reverse pattern, and that phylogenetic diversity is more strongly correlated with temperature-related variables compared with precipitation-related variables.

Conclusions: We interpret the opposite patterns observed in phylogenetic diversity and species richness in terms of a more recent origin of tropical diversity coupled with higher extinctions in temperate regions.

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中国区域肝草群系统发育结构的空间模式和气候驱动因素。
背景与目的:纬度多样性梯度与热带生态位保守主义假说密切相关,该假说认为,由于热带祖先品系在适应低温和在热带以外地区定居方面面临挑战,因此存在着一个强大的过滤器。在肝草属植物中,热带地区的物种丰富度较高,但基系的多样性中心却分布在热带以外的地区,这表明温带起源的物种系统发育上聚集在一起,形成了热带地区的殖民地。在此,我们通过分析中国肝草植物的宏观气候变异与系统发育多样性之间的关系来验证这一假设:方法:利用回归分析方法,将中国 28 个省级区域植物区系中肝草类的系统发育多样性指标及其标准化效应大小与纬度和六个气候变量联系起来。我们进行了变异分区分析,以确定每组气候变量的相对重要性:我们发现,物种数量随纬度的增加而减少,而系统发育多样性则呈现相反的模式,与降水相关变量相比,系统发育多样性与温度相关变量的相关性更强:我们将系统发育多样性和物种丰富度的相反模式解释为热带多样性起源较晚,而温带地区物种灭绝较多。
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来源期刊
Annals of botany
Annals of botany 生物-植物科学
CiteScore
7.90
自引率
4.80%
发文量
138
审稿时长
3 months
期刊介绍: Annals of Botany is an international plant science journal publishing novel and rigorous research in all areas of plant science. It is published monthly in both electronic and printed forms with at least two extra issues each year that focus on a particular theme in plant biology. The Journal is managed by the Annals of Botany Company, a not-for-profit educational charity established to promote plant science worldwide. The Journal publishes original research papers, invited and submitted review articles, ''Research in Context'' expanding on original work, ''Botanical Briefings'' as short overviews of important topics, and ''Viewpoints'' giving opinions. All papers in each issue are summarized briefly in Content Snapshots , there are topical news items in the Plant Cuttings section and Book Reviews . A rigorous review process ensures that readers are exposed to genuine and novel advances across a wide spectrum of botanical knowledge. All papers aim to advance knowledge and make a difference to our understanding of plant science.
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