Owen McMillan and Eldredge Bermingham met in Seattle, Washington where they began their study of Dall's porpoise. Though their pathways diverged from there (Eldredge went on to the Smithsonian's Tropical Research Institute in Panama and Owen went to graduate school in Hawaii) they have maintained a close friendship driven by common intellectual and recreational interests. Both continue to utilize molecular approaches to understand the evolutionary and population dynamics of natural populations, and are currently working in the New World tropics on birds, butterflies and fish.
The phylogeographic pattern of mitochondrial DNA variation in the Dall's porpoise Phocoenoides dalli
Article first published online: 28 JUN 2008
Volume 5, Issue 1, pages 47–61, February 1996
How to Cite
MCMILLAN, W. O. and BERMINGHAM, E. (1996), The phylogeographic pattern of mitochondrial DNA variation in the Dall's porpoise Phocoenoides dalli. Molecular Ecology, 5: 47–61. doi: 10.1111/j.1365-294X.1996.tb00290.x
- Issue published online: 28 JUN 2008
- Article first published online: 28 JUN 2008
- Received 10 February 1995 revised 26 July 1995 accepted 1 August 1995
- equilibrium populations;
- intraspecific gene genealogies;
We used 11 restriction endonucleases to study mtDNA variation in 101 Dall's porpoises Phocoenoides dalli from the Bering Sea and western North Pacific. There was little phylogeographic patterning among the 34 mtDNA haplotypes identified in this analysis, suggesting a strong historical connection among populations across this region. Nonetheless, mtDNA variation does not appear to be randomly distributed in this species. Both GST and AMOVA uncovered significant differences in the distribution of mtDNA variation between the Bering Sea and western North Pacific populations. These mtDNA results, coupled with differences in allozyme variation and parasite infestation, support the demographic distinctiveness of Bering Sea and western North Pacific stocks of Dall's porpoise. The lack of a strong phylogeographic orientation of mtDNA haplotypes within the Dall's porpoise is similar to the pattern reported in other vertebrates such as coyotes, blackbirds, chickadees, marine catfish, and catadromous eels. Like Dall's porpoise, these species are broadly distributed, and have large populations linked by moderate to high levels of gene flow. However, the more complex, deeply branched phylogenetic network of mtDNA haplotypes within Dall's porpoise, relative to these other vertebrates, suggests important differences between these species in the forces shaping mtDNA variation. One such force is the effective size of female populations, which appears to have been comparatively large and stable in Dall's porpoise.