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Effects of population disjunction on isozyme variation in the widespread Pilgerodendron uviferum

Premoli, A. C., Souto, C. P., Allnutt, T. R. and Newton, A. C. 2001, Effects of population disjunction on isozyme variation in the widespread Pilgerodendron uviferum, Heredity, vol. 87, no. 3, pp. 337-343, doi: 10.1046/j.1365-2540.2001.00906.x.

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Title Effects of population disjunction on isozyme variation in the widespread Pilgerodendron uviferum
Author(s) Premoli, A. C.
Souto, C. P.
Allnutt, T. R.
Newton, A. C.
Journal name Heredity
Volume number 87
Issue number 3
Start page 337
End page 343
Total pages 7
Publisher Wiley
Place of publication London, Eng.
Publication date 2001-09-13
ISSN 0018-067X
Keyword(s) Genetic Variation
Geography
Isoenzymes
Plants
Polymorphism, Genetic
Summary Geographical range is considered a good predictor of the levels of isozyme variation in plants. Widespread species, often consisting of historically larger and more continuous populations, maintain higher polymorphism and are less affected by drift, which tends to erode genetic variation in more geographically restricted species. However, widespread species occurring in small and disjunct populations may not fit this pattern. In this study we examined genetic variation in Pilgerodendron uviferum, a conifer endemic to temperate forests of southern South America, and is such a widespread and habitat-restricted species. Twenty populations along the whole range of Pilgerodendron were analysed by isozyme electrophoresis to resolve 14 putative genetic loci. Eleven were polymorphic in at least one population although only six of them were polymorphic in more than one population. We found reduced within-population levels of isozyme variation, with only 11% polymorphic loci (0.95 criterion), 1.2 mean number of alleles per locus, and mean observed and expected heterozygosities of 0.024 and 0.033, respectively. Most genetic diversity was found within populations (H(T)=0.039, H(S)=0.033, F(ST) 15%). Greater polymorphism and lower divergence was estimated in the more geographically restricted and closely related Fitzroya. Thus, total range, in combination with information on the degree of among-population isolation, may be a better predictor of the levels of polymorphism than range size alone.
Language eng
DOI 10.1046/j.1365-2540.2001.00906.x
Field of Research 060499 Genetics not elsewhere classified
0604 Genetics
0603 Evolutionary Biology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2001, The Genetics Society of Great Britain
Persistent URL http://hdl.handle.net/10536/DRO/DU:30091821

Document type: Journal Article
Collection: School of Medicine
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