Evolutionary and ecological causes of species richness patterns in North American angiosperm trees
文献类型：SCI/SSCI论文
| 作者 | Qian H.; Wiens, J. J.; Zhang, J.; Zhang, Y. J. |
| 发表日期 | 2015 |
| 关键词 | latitudinal diversity gradient global patterns niche conservatism phylogenetic structure plant diversity diversification rate communities climate biodiversity time |
| 英文摘要 | Climate and evolutionary factors (e.g. diversification, time-for-speciation, niche conservatism) are both thought to be major drivers of species richness in regional assemblages. However, few studies have simultaneously investigated the relative effects of climate and evolutionary factors on species richness across a broad geographical extent. Here, we assess their relative effects on species richness of angiosperm trees across North America. Species richness of angiosperm trees in 1175 regional assemblages were related to climate and phylogenetic structure using a structural equation modeling (SEM) approach. Climate was quantified based on the mean temperature of the coldest month and mean annual precipitation. Evolutionary factors (time-for-speciation vs diversification) were inferred from phylogeny-based measures of mean root distance, phylogenetic species variability, and net relatedness index. We found that at the continental scale, species richness is correlated with temperature and precipitation with approximately similar strength. In the SEM with net relatedness index and phylogenetic species variability and with all the 1175 quadrats, the total direct effect size of phylogenetic structure on species richness is greater than the total direct effect size of climate on species richness by a factor of 3.7. The specific patterns of phylogenetic structure (i.e. greater phylogenetic distances in more species rich regions) are consistent with the idea that time and niche conservatism drive richness patterns in North American angiosperm trees. We conclude that angiosperm tree species richness in regional assemblages in North America is more strongly related to patterns of phylogenetic relatedness than to climatic variation. The results of the present study support the idea that climatic and evolutionary explanations for richness patterns are not in conflict, and that evolutionary processes explain both the relationship between climate and richness and substantial variation in richness that is independent of climate. |
| 出处 | Ecography |
| 卷 | 38 |
| 期 | 3 |
| 页 | 241-250 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0906-7590 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/38809]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Qian H.,Wiens, J. J.,Zhang, J.,et al. Evolutionary and ecological causes of species richness patterns in North American angiosperm trees. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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