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Dating the origins of plants endemic to the Corso-Sardinian microplate: a window on the biogeography of the western Mediterranean basin

Titel Englisch Dating the origins of plants endemic to the Corso-Sardinian microplate: a window on the biogeography of the western Mediterranean basin
Gesuchsteller/in Conti Elena
Nummer 105495
Förderungsinstrument Projektförderung (Abt. I-III)
Forschungseinrichtung Institut für Systematische Botanik und Botanischer Garten Universität Zürich
Hochschule Universität Zürich - ZH
Hauptdisziplin Oekologie
Beginn/Ende 01.03.2005 - 31.12.2008
Bewilligter Betrag 335'000.00
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Keywords (14)

Mediterranean biodiversity; molecular dating; fossils; event-based biogeography; paleogeology; paleoclimate reconstruction; island endemics; continental islands; oceanic islands; allopatric speciation; paleoclimate; microplates; ancestral area reconstruction; biodiversity

Lay Summary (Englisch)

Lay summary
The main goal of this project was to explain when and how island endemics of the Mediterranean region colonized Corsica and Sardinia (continental islands) and the Canary archipelago (oceanic islands). To answer these questions, we used results from molecular dating analyses of DNA sequences and ancestral area reconstruction and integrated them with prior knowledge about past climatic (i.e., onset of the Mediterranean climate) and geologic events (i.e., microplate movements, formation of temporary corridors, origin of volcanic islands) in the Mediterranean region. We focused our analyses on the angiosperm families Araceae, Boraginaceae and Rutaceae. In Araceae, our analyses supported two main invasions of the Mediterranean basin, one from an area connecting North America and Eurasia in the Late Cretaceous and one from the Anatolian microplate in western Asia during the Late Eocene, thus confirming the proposed heterogeneous origins of the Mediterranean flora. In Boraginaceae, the biogeographic analyses revealed an Anatolian origin for Anchusa, Borago and Echium and underlined the importance of the Eastern Mediterranean region as a reservoir for plant evolution in the Mediterranean Basin. In Rutaceae, our results supported a single invasion of the Canary Islands and the phylogenetic separation of the populations of Ruta endemic to Corsica (R. corsica) and Sardinia (R. lamarmorae), suggesting that the Strait of Bonifacio promoted allopatric speciation on the two islands. Future open questions include the following: Is there any gene flow between endemics of adjacent islands (i.e., Corsica and Sardinia; the Canary islands)? Can we use ecological niche modeling to predict how projected climate changes will affect the distribution and survival of island endemics in the Mediterranean region? How will climate change affect the relationship between island endemics and their pollinators?
Direktlink auf Lay Summary Letzte Aktualisierung: 21.02.2013

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129170 Genetic Diversity of Island Endemics in the Mediterranean Region: Comparison between Oceanic and Continental Islands 01.03.2010 Marie Heim-Voegtlin Beiträge