植物系统发育区系地理学研究: 以云南植物区系为例

doi:10.17520/biods.2016001

摘要/Abstract

摘要：

传统植物区系地理学研究主要以植物区系的分类群组成及其分布区类型的分析为主, 忽视了进化历史的分析。本文根据前期云南植物区系的分区研究, 基于云南种子植物1,983个属的系统发育关系, 结合其地理分布, 从进化历史的角度分析不同地理单元的分类群组成、系统发育组成及其相似性, 探讨各个地理单元的系统发育结构及地理单元间的系统发育相似性。结果表明: 云南植物区系不同地理单元的系统发育多样性与科或属的丰富度显著相关, 其系统发育结构为非随机型; 不同地理单元间的系统发育组成相似性与分类群组成相似性显著相关, 二者的聚类分析均表明具有热带植物区系性质的地理单元与具有温带植物区系性质的地理单元各自聚为一类。由此可见, 融合进化历史信息的植物区系分析有助于更加深入地理解植物区系的性质和来源。

关键词: 分类群组成, 系统发育多样性, 系统发育组成, 系统发育结构, 生物地理学

Abstract

Traditional attempts of floristic studies typically focus on the analyses of taxonomic composition and areal-types of flora, often ignoring the rich context that evolutionary history can provide. In this study, based on the recent study examining the delineation of floristic regions in Yunnan, by combining data on the distributions and phylogenetic relationships of 1,983 genera of native seed plants, we explore how taxonomic composition, phylogenetic relatedness, and phylogenetic structure vary across the different geographic regions in this area. As predicted, phylogenetic diversity was well correlated with taxonomic diversity among the geographic regions. Using null model analyses, we found evidence of nonrandom phylogenetic structure across the region. Also, phylogenetic relatedness was well correlated with taxonomic composition between geographic regions in Yunnan. Cluster analyses of the similarities of phylogenetic relatedness and taxonomic composition show that geographic regions with tropical floristic affinity form a single cluster separate from another cluster composed of geographic regions with temperate floristic affinity. Our results show that the integration of phylogenetic information can help us to better understand the characteristics and origin of flora.

Key words: taxonomic composition, phylogenetic diversity, phylogenetic relatedness, phylogenetic structure, biogeography

李嵘, 孙航 (2017) 植物系统发育区系地理学研究: 以云南植物区系为例. 生物多样性, 25, 195-203. DOI: 10.17520/biods.2016001.

Rong Li, Hang Sun (2017) Phylofloristics: a case study from Yunnan, China. Biodiversity Science, 25, 195-203. DOI: 10.17520/biods.2016001.

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链接本文: https://www.biodiversity-science.net/CN/10.17520/biods.2016001

https://www.biodiversity-science.net/CN/Y2017/V25/I2/195

图/表 6

图1 基于云南植物区系分区研究划分的8个地理单元(引自Li et al, 2015a)

Fig. 1 The delineation of eight floristic regions in Yunnan, China (adopted from Li et al, 2015a)

图2 云南植物区系的宏系统发育树

Fig. 2 The mega-phylogeny of seed plants in Yunnan

表1 云南种子植物区系不同地理单元的分类群多样性与系统发育多样性比较

Table 1 Comparison of taxonomic diversity and phylogenetic diversity of different geographic regions for the seed plants in Yunnan

地理单元 Geographic regions	科丰富度 Family richness	属丰富度 Genus richness	系统发育多样性 Phylogenetic diversity
I	180	1,226	134,237.26
II	149	725	82,676.45
III	176	990	112,736.74
IV	165	902	103,039.67
V	160	875	97,805.24
VI	126	520	63,362.67
VII	204	1,405	154,165.33
VIII	205	1,429	156,662.31

图3 云南植物区系不同地理单元系统发育多样性与科丰富度(a)和属丰富度(b)的关系(I-VIII代表的地理单元同图1)

Fig. 3 Relationships between phylogenetic diversity and family richness (a) or genus richness (b) among the floristic regions in Yunnan. I-VIII indicate different floristic regions as in Fig. 1.

表2 云南种子植物区系不同地理单元的系统发育结构

Table 2 Phylogenetic structure of different geographic regions for the seed plants in Yunnan

地理单元 Geographic regions	净相关指数 Net relatedness index	系统发育结构 Phylogenetic structure
I	0.60	聚集型 Underdispersed
II	0.05	聚集型 Underdispersed
III	-1.20	离散型 Overdispersed
IV	0.81	聚集型 Underdispersed
V	0.02	聚集型 Underdispersed
VI	1.01	聚集型 Underdispersed
VII	1.35	聚集型 Underdispersed
VIII	1.00	聚集型 Underdispersed

图4 云南植物区系不同地理单元间分类学组成(a)与系统发育组成(b)的相似性聚类

Fig. 4 A cluster dendrogram representing the taxonomic floristic similarity (a) and the phylofloristic similarity (b) between the geographic regions of Yunnan. I-VIII indicate different floristic regions as in Fig. 1.

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