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Genetic relationship among eurasian and american larix species based on allozymes
1Institute of Plant and Animal Ecology, 620144 Ekaterinburg, Russia; Department of Genetics, Uppsala University, Box 7003, 75007 Uppsala, Sweden.
Abstract:
Genetic variation at 16 allozyme loci was studied in both American (Larix occidentalis Nutt., L. laricina (Du Roi) C. Koch, L. lyallii Parl.) and Eurasian (L. sibirica Ledeb., L. gmelinii Rupr., L. olgensis A. Henry, L. kaempferi (Lamb.) Carr. (=L. leptolepis (Sieb. et Zucc.) Endl.), L. kamtschatica (Rupr.) Carr. and L. decidua (Mill. )) larch species. Species with a limited range, such as L. olgensis and L. lyallii, had lower genetic variation than species with a wider range. Population differentiation within species was of the same order of magnitude among species. The resulting phylogeny indicates a clear separation between American and Eurasian species. This result is in agreement with recent palaeontological findings that suggest that gene flow between American and Eurasian species has been unlikely since the last glaciation.
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