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Genetic structure and differentiation in Metrosideros polymorpha (Myrtaceae) along altitudinal gradients in Maui, Hawaii

Published online by Cambridge University Press:  14 April 2009

K. M. Aradhya ,
D. Mueller-Dombois  and
T. A. Ranker
K. M. Aradhya
Affiliation:
Department of Botany, University of Hawaii at Manoa, 3190 Maile Way, Honolulu, Hawaii 96822, USA
D. Mueller-Dombois*
Affiliation:
Department of Botany, University of Hawaii at Manoa, 3190 Maile Way, Honolulu, Hawaii 96822, USA
T. A. Ranker
Affiliation:
University Museum and Department of Environmental, Population, and Organismic Biology, University of Colorado, Boulder, CO 80309, USA
*
* Corresponding author.
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The level and distribution of genetic variability within and among Metrosideros polymorpha populations along altitudinal gradients on the island of Maui, Hawaii were examined to assess the extent of genetic differentiation. Sixteen loci encoding 11 enzymes were scored in 17 populations along the NE wet slope of Mt. Haleakala and Kipahulu Valley in East Maui and six populations along the Puu Kukui trail in West Maui. On average, 50% of the loci were polymorphic within populations with an overall mean of 2·15 alleles per locus. The observed heterozygosities for different populations were moderate (0·108–0·220) and conformed to panmixia except for one of the mid-elevation populations. The distribution of allozyme variation indicates that very little differentiation has occurred along altitudinal gradients. Approximately 90% of the total variation resides within populations in East Maui while 95% was found within West Maui populations. The mean populational pair-wise genetic identities (Nei's I) ranged from 0·909 to 0·998. The UPGMA cluster analysis on genetic identity matrices and PCA on allele frequencies revealed marginal altitudinal differentiation. Twenty one alleles out of a total 63 showed statistically significant correlations with environmental variables.

Type
Research Article
Information
Genetics Research , Volume 61 , Issue 3 , June 1993 , pp. 159 - 170
Copyright
Copyright © Cambridge University Press 1993

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