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Unformatted text preview: Molecular Ecology and Systematic of the Dusky Dolphin (Lagenorhynchus Obscurus) The Dusky Dolphin is part of the genus Lagenorhynchus. The genus Lagenorhynchus has an anti-tropical distribution and has the largest aggregations along continental shelves. There are morphological inconsistencies with the Lagenorhynchus. They are identified by geographic locality, length and width of the beak, and number of teeth. However, the problems are that beak size is associated with age and sex, there are variations in tooth arcade within the same jaw, and the geographic locality is not reliable in early sightings. April Harlin-Cognato followed a quantitative systematic method—the total evidence phylogeny in order to construct one big tree. She measured how well supported each data was and she wanted to know how well her data supported her hypothesis. She investigated the West-Wind Drift hypothesis, which said that there was geographic variation in skull measurements and the root of divergence from the Peruvian “stock” began in...
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This essay was uploaded on 03/19/2008 for the course LBS 144 taught by Professor Urquhart/peters during the Spring '07 term at Michigan State University.
- Spring '07