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Lecture 5

BIOL 3130 Lecture Notes - Lecture 5: Allopatric Speciation, Pleistocene, Features Of The Marvel Universe

Course Code
BIOL 3130
Andrew Mac Dougall

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1. Understanding how species are created:
what are the various types of speciation?
does speciation occur at equal rates and by similar mechanisms across the planet?
do different types of speciation result in different degrees of sensitivity to extinction?
can speciation occur rapidly in response to modern-day global environmental change?
1) Allopatric
Population splits into two geographically isolated populations
Dissimilar selective pressures; different mutations arise
allo= other, patri=plae (other-place)
Study: glacial cycles as an allopatric speciation pump in north-eastern American freshwater fish
Strong evidence that allopatric speciation has contributed to the diversification of the north-
eastern American freshwater fish and confirm that Pleistocene glacial cycles can be views as a
speiatio pup that played a predoiat role in generating biodiversity
EX: retreating glaciers caused rivers to become impassible, Sticklebacks separated into 2
What are the conservation advantages of this knowledge for restoring/preserving the nationally
endangered Red-side Dace?
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