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- W3215593521 abstract "Abstract Aim At the macroscale, climate strongly correlates with species richness gradients, resulting from differences in in‐situ diversification and dispersal. One historical explanation for the pattern is that regions spanning temperate climates contain few species because past disturbances have generated high extinction rates, and species from tropical regions are unable to easily colonize temperate regions. We test these postulates for Himalayan plants, which span subtropical to temperate climates over steep elevational gradients. Location Himalaya. Time period Present day. Major taxa studied Angiosperms. Methods We use a comprehensive survey of 31 floras to document the elevational and geographical distributions of native Himalayan plants, augmented by field studies of trees in both the east and west Himalaya. We use grade of membership models to cluster species according to locations shared and phylogenetic analysis to evaluate diversification rates. Results Species fall into four cohesive biotas, organized by climate. Points of turnover between biotas occur where the mean minimum temperature of the coldest month is approximately 0 °C (2,000–2,500 m), and at the point of occasional annual freezing (1,000–1,500 m); these boundaries run the length of the Himalaya. The patterns are retained when we consider whole clades rather than species. All plants (and the subsets trees, herbs and shrubs) belonging to the biota above the 2,000–2,500 m line have higher recent speciation rates than those lower down. Main conclusions We attribute the high rate of recent speciation in temperate climates to high rates of turnover, creating ecological and geographical opportunity. The high elevation biota has few species, but spans the largest area, implying species numbers are far from any carrying capacity, at least with respect to accumulation of allopatric forms. This study thus links climatic restrictions of clades to differences in diversification rates, and by inference species numbers." @default.
- W3215593521 created "2021-12-06" @default.
- W3215593521 creator A5023671613 @default.
- W3215593521 creator A5048892891 @default.
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- W3215593521 date "2021-11-20" @default.
- W3215593521 modified "2023-09-28" @default.
- W3215593521 title "Key roles for the freezing line and disturbance in driving the low plant species richness of temperate regions" @default.
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- W3215593521 doi "https://doi.org/10.1111/geb.13427" @default.
- W3215593521 hasPublicationYear "2021" @default.
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