BIOL 3130 Lecture Notes - Lecture 5: Allopatric Speciation, Pleistocene, Features Of The Marvel Universe
23 Feb 2018
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Speciation: population splits into two geographically isolated populations, dissimilar selective pressures; different mutations arise (cid:858)allo(cid:859)= (cid:858)other(cid:859), patri(cid:272)=(cid:859)pla(cid:272)e(cid:859) (other-place) What are the conservation advantages of this knowledge for restoring/preserving the nationally endangered red-side dace: we understand the genetic uniqueness so we can better target our management strategies. One could go extinct and you wouldn"t realize if you didn"t know the difference. Ex: komodo dragon ancestor went to tiny island- evolved into a population. Best known island species were created through peripatric speciation. Individuals may come in contact but reduced offspring leads to selection of mechanisms that prevent inter-breeding: hybrids have lower fitness, 2 extremes survive (outbreeding depression, no specific extrinsic barrier to gene flow. The population is continuous but the population does not mate randomly. Individuals are more likely to mate with their geographic neighbors than with individuals in a different part of the population"s range: para=beside (beside-place)
