Jairo Patiño, Department of Biology, Ecology and Evolution, Liege University
Friday 9 May 11:00
Sir Neil Chalmers seminar room, Darwin Centre LG16 (below Attenborough studio)
Oceanic island biotas are typically characterized by high levels of endemism and a suite of specific life-history traits known as island syndromes. Low levels of genetic diversity and limited dispersal capacities of island lineages have driven the view that oceanic islands are evolutionary dead-ends.
Here, we demonstrate the role of oceanic islands as dynamic platforms for the assembly of entire continental biotas in organisms with high dispersal capacities, using bryophyte species as a model. Based on an Approximate Bayesian Computation framework, we show that the patterns of genetic variation were consistently more similar with those simulated under a scenario of de novo foundation of continental populations from insular ancestors than with those expected if islands would represent a sink or a refugium of continental biodiversity.
The dominant pattern of continental colonization from islands reported here suggests that the Macaronesian archipelagos have played a key role as stepping-stones, transforming trans-continental migrants into new endemic species before they eventually ended their colonization road in a new continental environment.
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