Geographical variation of gene diversity of Empha

Authors: S C GonzálezMartínez L Salvador D Agúndez R Alía L Gil

Publish Date: 2001

Volume: , Issue: , Pages: 161-171

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Abstract

The geographical variation of 25 native populations of maritime pine Pinus pinaster Ait was studied using ten allozymes encoded by 16 loci A phylogenetic tree based on Nei’s unbiased genetic distance and a Mantel’s randomization test were made Geostatistical analysis was used for describing in more detail spatial patterns of gene frequencies The phylogenetic analysis found a clear clustering in northwestern populations and a complex pattern with two differentiated groups in the southeastern and eastern regions Clinal trends of variation and finescale spatial structure were detected by geostatistical analysis Directional clinal variation was found from south to north and though to a lesser extend from east to west This pattern was stronger when populations were separated by more than 250 km The longdistance founder events during postglacial spread and the orientation of the main mountain ranges are proposed to be the main causes of the geographical structure of this species

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