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Different trends in phylogenetic and functional structure of plant communities along an elevation gradient

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Ecological Research

Abstract

The study of diversity gradients due to elevation dates back to the foundation of biogeography and ecology. Although elevation-driven patterns of plant diversity have been reported for centuries, uncertainty still exists about the assembly rules that drive these patterns. In this study, we revealed the causal factor of community assemblies for the diversity of tree and herb species along an elevation. To this end, we applied an integrated method using both functional traits and phylogeny, called the mean pairwise functional-phylogenetic distance, to understand the assembly rules for woody and herbaceous species communities along an elevation gradient. At higher elevation sites, woody and herbaceous communities were comprised of species having similar traits. The phylogenetic trends for woody species were consistent with the functional trends; closely related species co-occurred more frequently than expected at higher elevations. Phylogenetic trends for herb species were opposite to the functional trends; species with similar traits but having a random phylogenetic distribution co-occurred at higher elevations. We suggest that the community assembly rules for woody and herb species vary with elevation; and functional constraints due to environmental filtering at higher elevation act as assembly rules along gradients in both woody and herbaceous communities, even though their phylogenetic backgrounds differ.

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Acknowledgements

This study could not have been completed without the particularly demanding fieldwork, and we are grateful to all who assisted with this work. We are particularly thankful to Takayuki Shiono, ToeToeAung, Ryo Maeshiro, Shenhua Qian, Takayuki Ohgue, and Keita Nishizawa. We thank Shinichi Tatsumi for instructive advice and field work. This research was supported by grants from the Sumitomo Foundation, the Japan Securities Scholarship Foundation, and Kajima Foundation. Logistical support for fieldwork was provided by the Shiretoko Foundation.

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KR Originally formulated the idea, developed original idea, conducted fieldwork, performed statistical analyses, and wrote the manuscript. KD Developed original idea, conducted fieldwork and wrote the manuscript. MAS Originally formulated the idea, developed original idea, conducted fieldwork, and wrote the manuscript.

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Correspondence to Ryo Kitagawa.

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Kitagawa, R., Koide, D. & Mori, A.S. Different trends in phylogenetic and functional structure of plant communities along an elevation gradient. Ecol Res 33, 1233–1243 (2018). https://doi.org/10.1007/s11284-018-1638-5

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  • DOI: https://doi.org/10.1007/s11284-018-1638-5

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