webnotes_speciation_and_pop_growth_10180

webnotes_speciation_and_pop_growth_10180 - Phylogenetic...

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Announcements Return extended response portion of Exam 1 Today: Finish speciation Start population growth
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Genetic divergence barrier X Reproductively incompatible (isolated) speciation Incomplete reproductive isolation rejoin populations or hybrids
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Sympatric speciation By any means that reduce reproductive incompatibility Polyploidy – duplication of chromosome sets autopolyploidy allopolyploidy Goatsbeard or salsify ( Tragopogon spp.)
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Disruptive selection = high mortality OR lower fitness time Reproductively isolated sympatric speciation Black-bellied seedcracker (W. Africa)
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Paths of evolution (change over time)
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Rate of organic evolution Depends on: dispersal ability extent to which resources are distinguished resource availability and environmental variation
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CRUST
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common ancestor
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Unformatted text preview: Phylogenetic tree: classification of evolutionary relatedness for Hawaiian honeycreepers Population growth number Black-bellied seedcracker (W. Africa) Age structure - human As a fisheries biologist, what could you interpret from these data from fish trawlers? Survivorship curves Population growth Pop growth rate = (birth rate death rate) + (immig rate emig rate) r = (b d) + (i e) Population growth over time = growth rate * population size N/ t = r * N 700,000 / m 2 Population growth: zebra mussel exponential? dN/dt = r * N Exponential and logistic population growth dN/dt = r * N [ ( K N ) / K ] densitydependence Next up: Tuesday, October 23 Interactions within and between populations...
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This note was uploaded on 03/19/2008 for the course BS 110 taught by Professor S.lawrence during the Fall '07 term at Michigan State University.

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webnotes_speciation_and_pop_growth_10180 - Phylogenetic...

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