Phylogeography and Evolution of Afroalpine Flora
Summary
The Afroalpine flora occupies isolated high-altitude habitats above the treeline in equatorial East Africa, including the Rwenzori, Mount Kenya and the Simien Mountains. These sky islands present harsh diurnal climates with nightly frosts, intense solar radiation and low atmospheric pressure. Phylogeographic analyses reveal that the Afroalpine flora has assembled chiefly through episodic long-distance dispersal events from temperate regions, followed by rapid adaptation to alpine conditions and limited subsequent diversification. Repeated colonisation pulses since the Plio-Pleistocene, concurrent with mountain uplift and glacial oscillations, have shaped the genetic structure of endemic lineages. Conspicuous parallel evolution of growth forms—from giant rosettes in Lobelia and Dendrosenecio to cushion and dwarf shrubs in Alchemilla—highlights the role of convergent adaptation to extreme environments. Topographic isolation of mountain massifs has led to pronounced genetic differentiation across ranges, emphasising the importance of sky islands as both refuges and cradles of unique biodiversity. Current research underscores the fragility of these ecosystems in the face of climate warming and human disturbance.
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Phylogeography and Evolution of Afroalpine Flora publication trend
The graph below shows the total number of articles in phylogeography and evolution of afroalpine flora across all publications each year (not limited to Nature Index journals).
Technical terms
Phylogeography: The study of historical processes that have shaped the geographic distributions of genetic lineages.
Sky island: An isolated high-elevation habitat surrounded by vastly different lowland environments.
Long-distance dispersal (LDD): The movement of individuals or propagules across substantial geographic barriers, leading to colonisation of new habitats.
Gene flow: The exchange of genetic material between populations through migration and interbreeding.
References
- Repeatedly Northwards and Upwards: Southern African Grasslands Fuel the Colonization of the African Sky Islands in Helichrysum (Compositae). Plants (2023).
- History and evolution of the afroalpine flora: in the footsteps of Olov Hedberg. Alpine Botany (2021).
- Afro-alpine flagships revisited: Parallel adaptation, intermountain admixture and shallow genetic structuring in the giant senecios (Dendrosenecio). PLOS ONE (2020).
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