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MITOCHONDRIAL DNA VARIATION AND MATERNAL GENE FLOW AMONG HUMPBACK WHALES OF THE SOUTHERN HEMISPHERE
Author(s) -
Baker C. S.,
FlórezGonzález L.,
Abernethy B.,
Rosenbaum H. C.,
Slade R. W.,
Capella J.,
Bannister J. L.
Publication year - 1998
Publication title -
marine mammal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.723
H-Index - 78
eISSN - 1748-7692
pISSN - 0824-0469
DOI - 10.1111/j.1748-7692.1998.tb00758.x
Subject(s) - humpback whale , mitochondrial dna , southern hemisphere , biology , mtdna control region , gene flow , cetacea , balaenoptera , geography , zoology , fishery , ecology , haplotype , genetic variation , whale , gene , genetics , genotype
A bstract Samples of skin tissue were collected by biopsy darting from humpback whales ( Megaptera novaeangliae ) in six seasonal habitats representing three stocks and four regions: Groups IV (western Australia), V western component (eastern Australia), V eastern component (New Zealand and Tonga) and VI (the Antarctic Peninsula and Gorgona Island, Colombia, South America) of the Southern Hemisphere. A variable section of the mitochondrial DNA control region was amplified and sequenced from 84 of these individuals, distinguishing a total of 48 unique sequences ( i. e. , mtDNA nucleotypes). Phylogenetic reconstructions suggested that these nucleotypes form three clades, corresponding to those previously described in a world‐wide survey of humpback whale mtDNA variation, although bootstrap support for two of the clades was relatively low (<50%). An analysis of variance adapted for molecular information showed significant differentiation of nucleotypes among the three Groups (Stocks) and heterogeneity of haplotype diversity among the four regions. A pattern of interchange within and between oceanic basins was demonstrated by the presence of shared identical nucleotypes among humpback whales in regions of the Southern and Northern Hemispheres.