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Anagenetic evolution in island plants

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Abstract Aim 

Plants in islands have often evolved through adaptive radiation, providing the classical model of evolution of closely related species each with strikingly different morphological and ecological features and with low levels of genetic divergence. We emphasize the importance of an alternative (anagenetic) model of evolution, whereby a single island endemic evolves from a progenitor and slowly builds up genetic variation through time. Location 

Continental and oceanic islands. Methods 

We surveyed 2640 endemic angiosperm species in 13 island systems of the world, both oceanic and continental, for anagenetic and cladogenetic patterns of speciation. Genetic data were evaluated from a progenitor and derivative species pair in Ullung Island, Korea, and Japan. Results 

We show that the anagenetic model of evolution is much more important in oceanic islands than previously believed, accounting for levels of endemic specific diversity from 7% in the Hawaiian Islands to 88% in Ullung Island, Korea, with a mean for all islands of 25%. Examination of an anagenetically derived endemic species in Ullung Island reveals genetic (amplified fragment length polymorphism) variation equal or nearly equal to that of its continental progenitor. Main conclusions 

We hypothesize that, during anagenetic speciation, initial founder populations proliferate, and then accumulate genetic variation slowly through time by mutation and recombination in a relatively uniform environment, with drift and/or selection yielding genetic and morphological divergence sufficient for the recognition of new species. Low-elevation islands with low habitat heterogeneity are highly correlated with high levels of anagenetic evolution, allowing prediction of levels of the two models of evolution from these data alone. Both anagenetic and adaptive radiation models of speciation are needed to explain the observed levels of specific and genetic diversity in oceanic islands.
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Keywords: Amplified fragment length polymorphism; anagenesis; cladogenesis; endemic plants; genetic differentiation; habitat heterogeneity; island biogeography; island evolution; speciation

Document Type: Research Article

Affiliations: 1: Department of Systematic and Evolutionary Botany, Institute of Botany, University of Vienna, Vienna, Austria 2: Departamento de Ecología Vegetal (Botánica), Universidad de Sevilla, Sevilla 41012, Spain 3: Biologiezentrum, Landesmuseum, Johann-Wilhelm-Klein-Strasse 73, Linz 4010, Austria 4: Department of Botany, Faculty of Science, Charles University, Prague 11636, Czech Republic 5: Faculty of Biological Sciences, College of Natural Sciences, Chonbuk National University, Chonju, South Korea 6: Makino Herbarium, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

Publication date: 2006-07-01

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