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Evolution of the Canine Clade

Conor Morrison

on 20 April 2010

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Transcript of Canines

An Examination of Canidae Phylogenetics By Conor Morrison and Nicholas Tilden introduction Methods Conclusions Characteristics Found on all continents except Antarctica
One of the oldest groups of carnivores

Evolutionary Hypotheses Black Bear Urocyon littoralis Urocyon cinereoargenteus Vulpes macrotis Vulpes vulpes Canis latrans Canis lupus Canis familiaris Evolutionary Hypotheses Taxa Ursus americanus Canis latrans Urocyon cinereoargenteus Canis familiaris Canis lupus Urocyon littoralis Vulpus macrotis Vulpus vulpus Characters
13 skull characters
Focus characters:
Sagittal Crest
Cheek Bone Width sagittal crest no sagital crest DNA Parsimony
Used MacClade to evalute length of alternative trees
Used character mapping to find tree with fewest changes. Molecular vs. Morphological Evolution
Assuming clock-like progression of molecular changes, plot molecular vs. morphological changes. Choose Most Parsimonious Hypothesis, a.k.a. shortest tree 143 163 152 CONVERGENCE REVERSAL SYNAPOMORPHY sagittal crest bullae cheek bone width Patterns of Evolution
More synapomorphy than homoplasy
Most characters not significantly informative p = 0.1614
R = 0.1861
m = -0.669 2 Molecular tree shortest tree length
Negative correlation btw molecular and morphological evolution
Not "clock-like"
Many characters showed synapomorphy Molecular Morphological "Mortil" the end
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