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Unformatted text preview: vergence- differential evo.; diff. trajectories
-Species concepts 1 10/1/2013 Phylogeny – represents the “family
tree” of a group Very own little group-monophyletic “Bison” is a monophyletic
group – one branch on a
Bison has subspecies (not
shown on tree):
• Plains bison
• Wood bison Dusky Seaside Sparrows One species with six subspecies Ammodramus maritimus How many species using the:
Morphospecies concept? Assume all look distinct.
Biological? Assume they can all interbreed.
Phylogenetics? See above. ISOLATION 2 10/1/2013 Two Types of Speciation (ways to stop
1. Allopatric – physical separation via dispersal
(movement) or vicariance (barriers!)
• Geography Grand Canyon is an example of vicariance Allopatric Speciation
Dispersal versus Vicariance Two Types of Speciation (ways to stop
2. Sympatric – isolation
in same area…
differences) 3 10/1/2013 Sympatric Speciation
Hawthorn and Apple Flies
• Hawthorns and Hawthorn
flies native to US
• Apple trees introduced
• Hawthorn and apples smell
different and fruit at
different times (habitat
• Now two groups of flies… • Flies differ
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This document was uploaded on 02/26/2014 for the course ENG 102 at Maryland.
- Spring '12