Zhang Min, García Molinos Jorge, Su Guohuan, Zhang Huan, Xu Jun
Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Hubei Provincial Engineering Laboratory for Pond Aquaculture, College of Fisheries, Huazhong Agricultural University, Wuhan, China.
Arctic Research Center, Hokkaido University, Sapporo, Japan.
Front Plant Sci. 2019 Feb 22;10:161. doi: 10.3389/fpls.2019.00161. eCollection 2019.
Different non-mutually exclusive mechanisms interactively shape large-scale diversity patterns. However, our understanding of multi-faceted diversity and their determinants in aquatic ecosystems is far from complete compared to terrestrial ones. Here, we use variation partitioning based on redundancy analysis to analyze the relative contribution of environmental and spatial variables to the patterns of phylogenetic, taxonomic, and functional diversity in macrophyte assemblages across 214 Chinese watersheds. We found extremely high spatial congruence among most aspects of biodiversity, with some important exceptions. We then used variation partitioning to estimate the proportions of variation in macrophyte biodiversity explained by environmental and spatial variables. All diversity facets were optimally explained by spatially structured environmental variables, not the pure environment effect, implying that macrophyte are taxonomically, phylogenetically, and functionally clustered in space, which might be the result of the interaction of environmental and/or evolutionary drives. We demonstrate that macrophytes might face extensive dispersal limitations across watersheds such as topography and habitat fragmentation and availability.
不同的非互斥机制以交互方式塑造了大规模的多样性模式。然而，与陆地生态系统相比，我们对水生生态系统中多方面的多样性及其决定因素的理解还远未完善。在此，我们基于冗余分析使用变异分解来分析环境和空间变量对中国214个流域大型植物群落系统发育、分类和功能多样性模式的相对贡献。我们发现，除了一些重要的例外情况外，生物多样性的大多数方面在空间上具有极高的一致性。然后，我们使用变异分解来估计环境和空间变量所解释的大型植物生物多样性变异比例。所有多样性方面都能通过空间结构的环境变量得到最佳解释，而非单纯的环境效应，这意味着大型植物在分类学、系统发育和功能上在空间上聚类，这可能是环境和/或进化驱动力相互作用的结果。我们证明，大型植物可能面临跨流域的广泛扩散限制，如地形以及栖息地破碎化和可利用性等。
