期刊
BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
卷 190, 期 4, 页码 333-344出版社
OXFORD UNIV PRESS
DOI: 10.1093/botlinnean/boz030
关键词
angiosperms; environmental gradient; Himalayas; phylogenetic relatedness
资金
- Key Projects of the Joint Fund of the National Natural Science Foundation of China [U1802232]
- National Key R&D Program of China [2017YFC0505200]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA20050203]
- Major Program of the National Natural Science Foundation of China [31590823]
- National Natural Science Foundation of China [1700165]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2019382]
Ecologists have embraced phylogenetic measures of assemblage structure, in large part for the promise of better mechanistic inferences. However, phylogenetic structure is driven by a wide array of factors from local biotic interactions to biogeographical history, complicating the mechanistic interpretation of a pattern. This may be particularly problematic along elevational gradients, where rapidly changing physical and biological conditions overlap with geological and biogeographical history, potentially producing complex patterns of phylogenetic dispersion (relatedness). We focus on the longest elevational gradient of vegetation in the world (i.e. c. 6000 m in Nepal) to explore patterns of phylogenetic dispersion for angiosperms (flowering plants) along this elevational gradient. We used the net relatedness index to quantify phylogenetic dispersion for each elevational band of 100 m. We found a zig-zag pattern of phylogenetic dispersion along this elevational gradient. With increasing elevation, the phylogenetic relatedness of species decreased for the elevational segment between 0 and c. 2100 m, increased for the elevational segment between 2100 and c. 4200 m, and decreased for the elevational segment above c. 4200 m. We consider this pattern to be a result of the interaction of geophysical (e.g. plate tectonics) and eco-evolutionary processes (e.g. niche conservatism and trait convergence). We speculate on the mechanisms that might have generated this zig-zag pattern of phylogenetic dispersion.
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