MITOCHONDRIAL-DNA VARIATION AND EVOLUTIONARY RELATIONSHIPS IN THE AMAKIHI COMPLEX

Citation
Cl. Tarr et Rc. Fleischer, MITOCHONDRIAL-DNA VARIATION AND EVOLUTIONARY RELATIONSHIPS IN THE AMAKIHI COMPLEX, The Auk, 110(4), 1993, pp. 825-831
Citations number
41
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Ornithology
Journal title
ISSN journal
0004-8038
Volume
110
Issue
4
Year of publication
1993
Pages
825 - 831
Database
ISI
SICI code
0004-8038(1993)110:4<825:MVAERI>2.0.ZU;2-7
Abstract
An analysis of restriction-site variation in mitochondrial DNA was con ducted to examine relationships among five taxa in one group of honeyc reepers-the amakihi complex (genus Hemignathus). We analyzed 35 ingrou p and 3 outgroup samples. Tree topologies, based on both distance and parsimony methods, grouped taxa into two distinct lineages: the virens -wilsoni lineage; and the chloris-stejnegeri-parvus group. Inter-islan d sequence divergence (average d(xy) = 0.0368) is considerably higher than intra-island variation (mean d(x) = 0.0035), and is higher than a verage for avian species. Variability (measured as both nucleotide div ersity and maximum divergence between haplotypes) differs among island populations. Molecular evolutionary rates were calibrated on the basi s of maximum island age estimates; sequence divergence in this lineage is approximately 2% per million years. The relationships within the c hloris-stejnegeri-parvus clade generally are consistent with the previ ously proposed model of double invasion. Genetic distances and the pat tern of relationships among amakihi taxa indicate that species status for H. v. chloris and H. v. stejnegeri may be warranted.