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Abstract Detail

Evolution on Islands: a colloquium to honor the careers of Daniel Crawford and Tod Stuessy

Caujapé-Castells, Juli [1], Pérez-de-Paz, Julia [1].

Construing the genetic diversity patterns in the Canarian flora.

The detection of a significant East-to-West pattern of decreasing genetic diversity in the current population genetic dataset for the Canarian flora further suggests that the three easternmost Canary Islands (Fuerteventura,Lanzarote and Gran Canaria) could have acted as historical genetic diversity sinks, where multiple colonizations may have given rise to generalized admixture processes (i.e., syngameons) that aided to maintain species cohesion among genotypes that might have been previously isolated, and to promote rapid monophyly. Undisputably, the origins of the highly diverse Canarian flora have to be explained by a diversity of patterns and processes where the biotic characteristics of the colonizing lineages interact with the shifting historical-geographic features of the islands, and with stochasticity. However, for some of the groups that are now widespread in the Canaries, the high genetic variation levels in such syngameons could have been determinant to the successful colonization of the four westernmost islands, where a more complex geography and ecology feasibly promoted gene flow cessation, selection processes and a generally lower population genetic diversity. This "surfing syngameon" hypothesis will be discussed in relation to (i) the abiotic and biotic characteristics of the Canaries(ii) the theories on the origins and diversification of the Canarian and other oceanic floras that the contributions of Dan Crawford and Tod Stuessy have helped to substantiate, and (iii) the limitations of the current genetic dataset for thorough testing.

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1 - Jardin Botanico Canario "Viera y Clavijo"-Unidad Asociada CSIC (Cabild, Molecular Biodiversity and DNA Bank, Camino al palmeral 15, Tafira Alta, Las Palmas de Gran Canaria, 35017, Spain

Canary Islands
genetic diversity

Presentation Type: Symposium or Colloquium Presentation
Session: C5
Location: Franklin A/Hyatt
Date: Wednesday, July 11th, 2012
Time: 10:30 AM
Number: C5008
Abstract ID:436

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