In:
Genome, Canadian Science Publishing, Vol. 45, No. 6 ( 2002-12-01), p. 1248-1256
Abstract:
Allozyme variation in the forest grass Milium effusum L. was studied in 2123 populations within each of two equally sized densely sampled areas in northern and southern Sweden. In addition, 25 populations from other parts of Eurasia were studied for comparison. The structure of variation was analysed with both diversity statistics and measures based on allelic richness at a standardised sample size. The species was found to be highly variable, but no clear geographic patterns in the distribution of alleles or in overall genetic differentiation were found, either within the two regions or within the whole sample. Thus, no inferences about the direction of postglacial migration could be made. Obviously, migration and gene flow must have taken place in a manner capable of randomising the distribution of alleles. However, there were clear differences in levels and structuring of the variation between the two regions. Levels of variation, both in terms of genetic diversity and allelic richness, were lower in northern Sweden as compared with southern Sweden. In contrast, different measures of geographic structure all showed higher levels of population differentiation in the northern region. This is interpreted as due to different geomorphological conditions in the two regions, creating a relatively continuous habitat and gene flow in the southern region as compared with the northern region where the species, although common, is confined to narrow and mutually isolated corridors in the landscape.Key words: Milium effusum, allozymes, geographic differentiation, population fragmentation, allelic richness.
Type of Medium:
Online Resource
ISSN:
0831-2796
,
1480-3321
Language:
English
Publisher:
Canadian Science Publishing
Publication Date:
2002
detail.hit.zdb_id:
2020635-5
SSG:
12
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