Molecular Ecology and Evolution
Nettel, Alejandro , Dodd, Richard S , Afzal-Rafii, Zara .
Historic and recent gene flow in the black mangrove, Avicennia germinans (L.) L. (Avicenniaceae), along the East Pacific.
THE black mangrove is one of the main components of the mangrove ecosystems in the Americas and West Africa. This species has demonstrated an extraordinary dispersal potential by crossing the Atlantic in Quaternary times. We investigated migration along the Pacific Coast using nine nuclear microsatellites developed for this species. Preliminary results show extremely low diversity in populations from which most microsatellites were developed (Baja California, Mexico) and confirm the recent establishment of these northern populations during the Holocene after sea level stabilized. Pacific Central American populations are the most diverse and form two genetically divergent groups; one localized in central Panama and the other in northern Panama and Costa Rica. Migration between these regions is very limited, possibly due to the effect of the equatorial current system acting as a barrier to propagule-mediated gene flow. Preliminary results show some introgression between A. germinans and A. bicolor Standl., a partially sympatric species restricted to the Central American Pacific Coast dry forest, despite their ecological and phenological disparate characteristics. We discuss our results in the light of historic climate and sea level change, as well as their implications for the conservation of the species. KEYWORDS:
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1 - University of California, Berkeley, Environmental Science, Policy and Management, 137 Mulford Hall # 3114, Berkeley, California, 94720, USA
2 - CNRS-Universite d'Aix-Marseille III, IMEP, Faculte des Sciences St Jerome, Marseille, 13397, France
Presentation Type: Oral Paper:Papers for Topics
Date: Monday, July 31st, 2006
Time: 2:15 PM