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Abstract Detail


Biogeography

Meister, Joerg [1], Hubaishan, Mohamed A. [2], Kilian, Norbert [3], Oberprieler, Christoph [1].

Comparative phylogeography of the monsoon-affected coastal mountains on the Southern Arabian Peninsula.

THE monsoon affected coastal mountains of the southern Arabian Peninsula harbour in climatically favoured refugia vegetation elements of palaeo-African origin. To understand better the temporal and spatial differentiation and the climate-induced habitat fragmentation of the once continuous distribution range of this Afro-montane woodland belt we analyzed five representative plant species (Cadia purpurea, Euclea schimperi, Justicia areysiana, Launaea crassifolia, Maytenus senegalensis) using chloroplast PCR-RFLP and AFLP fingerprinting. Chloroplast haplotype patterns as well as AFLP data show a distinct geographical distribution pattern with a main split between eastern (Hawf Mountains, Dhofar Mountains) and western populations (Jabal Urays, Northern Yemen). Our results of the genetic differentiation of the populations clearly demonstrate the strong regional isolation and show differences in the population differentiation between the eastern and western region. The dating of the main inter-regional split based on nrDNA ITS sequence variation in Maytenus senegalensis is 0.8-1.8 Myr and indicates drastic habitat fragmentation events during the Pleistocene which are compatible with arid periods assumed for the area at around 1.7 Myr and 1.0 Myr. Intra-regional population genetic diversity and differentiation vary in the western and eastern region and could be connected to the complex history of monsoon activity on the Arabian Peninsula which led to periods of pluvial and arid conditions since the Late Tertiary.


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Related Links:
BIOTA-Africa project


1 - University of Regensburg, Institute of Botany, Universitätsstr. 31, Regensburg, 93053, Germany
2 - Ministry of Agriculture and Irrigation, Agricultural Research Station Fuwwa, Agricultural Research and Extension Authority (AREA)-Eastern Coastal Branch, P.O.Box 8073, Mukalla, , Yemen
3 - Botanic Garden & Botanical Museum Berlin-Dahlem, Königin-Luise-Str. 6-8, Berlin, 14191, Germany

Keywords:
Comparative phylogeography
Arabian Peninsula
Indian Ocean monsoon history
Chloroplast PCR-RFLP
AFLP fingerprinting
habitat fragmentation
Palaeo-climate humid-arid oscillations.

Presentation Type: Oral Paper:Papers for Topics
Session: 64-3
Location: 134/Performing Arts Center
Date: Wednesday, August 2nd, 2006
Time: 8:30 AM
Abstract ID:185


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