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2 Posts tagged with the island_biogeography tag

NHM Life Science Seminar


Björn Berning, Upper Austrian State Museums, Geoscientific Collections, Austria


Wednesday 28 May 11:00


Sir Neil Chalmers seminar room, Darwin Centre LG16 (below Attenborough studio)


In contrast to terrestrial faunas, the (historical) biogeography of marine invertebrates in oceanic islands has been thoroughly neglected and is almost entirely missing in biogeography textbooks. A joint effort to describe the diversity of marine faunas and the distribution of species has only recently been initiated (Census of Marine Life).


Findings on diverse biota from oceanic islands have led to a resurrection of the idea that dispersal plays powerful role of in generating large scale biogeographic patterns. In this talk, the marine natural history and (palae)oceanography of the Macaronesian islands and seamounts is summarised, with a focus on bryozoans as one of the most diverse groups among the marine benthos.


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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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