Institut for Biologi

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J.-C. Svenning

Effects of climate and topography on the diversity anomaly of plants disjunctly distributed in eastern Asia and eastern North America

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  • Xue Yin, Sun Yat-Sen University, Aarhus Universitet
  • ,
  • Hong Qian, Illinois State Museum
  • ,
  • Xinghua Sui, Sun Yat-Sen University
  • ,
  • Minhua Zhang, East China Normal University
  • ,
  • Lingfeng Mao, Nanjing Forestry University
  • ,
  • Jens Christian Svenning
  • Robert E. Ricklefs, University of Missouri-St. Louis, Department of Biology
  • ,
  • Fangliang He, East China Normal University, University of Alberta

Aim: Differences in physiography have been proposed to explain the diversity anomaly for vascular plants between environmentally similar regions of eastern Asia (EAS) and eastern North America (ENA). Here, we use plant species within disjunct genera to examine whether differences in topography contribute to the diversity anomaly and whether the richness–environment relationships differ between regions. Disjunct plants are used to ensure that the diversity anomaly relates to post-disjunction evolution and diversification rather than regional differences in clade ages or immigration. Location: EAS and ENA. Time period: Current. Major taxa studied: Plant taxa disjunctly distributed in EAS and ENA. Methods: We compiled county-level plant distribution data, and calculated species richness and variables of topography and climate within unit grid cells. We compared estimated coefficients of region effects among models, where richness was fitted with or without topography and climate. Topography and climate were also used to separately model within-region spatial diversity patterns using spatial simultaneous autoregressive error models. Results: The coefficients of region effects varied from −.776 for the model only including region to −.309 when topography was controlled for, but remained significant. Climate dominated the spatial diversity patterns in ENA. In contrast, the influence of climate (14.2%) on species richness was weaker than that of topography (18.3%) in the warm area of EAS. Relations to elevation and temperature varied between regions, shifting between positive and negative relationships in several cases. Main conclusions: Our results demonstrate that variability in local topography contributes to the strong regional anomaly in plant species richness between EAS and ENA. Nevertheless, the diversity anomaly persists after controlling for local topography and climate. EAS and ENA also exhibit contrasting richness–environment relationships, providing another divergent aspect between the EAS–ENA disjunct floras. Our findings highlight that regional differences in topography or other environmental factors may underlie the diversity anomaly.

TidsskriftGlobal Ecology and Biogeography
StatusAccepteret/In press - 2021

Bibliografisk note

Funding Information:
We thank Chengjin Chu, Yongfa Chen, Scott Jarvie, Ming Ni and Haibin Yu for fruitful discussions. This work was supported by East China Normal University, Sun Yat‐sen University (SYSU; to the former SYSU‐Alberta Joint Lab for Biodiversity Conservation), China Scholarship Council (XY), the Natural Sciences and Engineering Research Council of Canada (FH), the Key Projects of the Joint Fund of the National Natural Science Foundation of China (U1802232) to HQ, National Natural Science Foundation of China (31870506) to LM. JCS considers this work as a contribution to his VILLUM Investigator project ‘Biodiversity Dynamics in a Changing World’ funded by VILLUM FONDEN (grant 16549) and his Independent Research Fund Denmark Natural Sciences project TREECHANGE (grant 6108‐00078B).

Publisher Copyright:
© 2021 John Wiley & Sons Ltd

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