Journal
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
Volume 287, Issue 1923, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rspb.2019.2933
Keywords
campo rupestre; Espinhaco Range; Pliocene; Pleistocene; climatic fluctuations; species pump
Categories
Funding
- FAPESP [2018/02191-1]
- Bentham Moxon Trust from the Royal Botanic Gardens, Kew
- Serrapilheira Institute [Serra-1709-21213]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [18/02191-1] Funding Source: FAPESP
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Mountains are among the most biodiverse areas on the globe. In young mountain ranges, exceptional plant species richness is often associated with recent and rapid radiations linked to the mountain uplift itself. In ancient mountains, however, orogeny vastly precedes the evolution of vascular plants, so species richness has been explained by species accumulation during long periods of low extinction rates. Here we evaluate these assumptions by analysing plant diversification dynamics in the campo rupestre, an ecosystem associated with pre-Cambrian mountaintops and highlands of eastern South America, areas where plant species richness and endemism are among the highest in the world. Analyses of 15 angiosperm clades show that radiations of endemics exhibit fastest rates of diversification during the last 5 Myr, a climatically unstable period. However, results from ancestral range estimations using different models disagree on the age of the earliest in situ speciation events and point to a complex floristic assembly. There is a general trend for higher diversification rates associated with these areas, but endemism may also increase or reduce extinction rates, depending on the group. Montane habitats, regardless of their geological age, may lead to boosts in speciation rates by accelerating population isolation in archipelago-like systems, circumstances that can also result in higher extinction rates and fast species turnover, misleading the age estimates of endemic lineages.
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