Nov 24 2009

Nov 24 2009 - Two common names lionfsh or…...

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Unformatted text preview: Two common names: lionfsh or… http://www.stanFord.edu/~bhackett/hawaii-2006-06/pages/hawaiian-turkeyfsh.html BIEB 132 Second midterm results • Average = 71.5 • Max = 98 • Min = 32 • N=268 Populations can diverge due to: 1. Restricted gene fow (dispersal barriers) can lead to population diFFerentiation. 2. Natural selection may Favor diFFerent genotypes in diFFerent environments resulting in population diFFerentiation in spite oF dispersal. Frequencies of alleles at a gene called “LAP” (an aminopeptidase) in Mytilus edulis , the blue mussel, which has planktonic larvae. Allele frequencies in different size classes Upper line in each graph is recruits; lower is adults Each year, recruits have higher frequency of Lap94, like those in the open ocean; but adults inside the Sound have low Lap94 -- Looks like Lap94 doesn’t survive well inside the Sound Low salinity Exposed Algal shaded Lower intertidal Spatial scale for adaptive genetic differentiation can be small if selection is strong Genetic relationships among Fundulus populations along the Atlantic coast …and median annual habitat temperatures Neutral and adaptive variation in gene expression Andrew Whitehead and Douglas L. Crawford, PNAS 2006 Mummichog ( Fundulus heteroclitus ) The mummichog is an estuarine species that can tolerate a wide range of temperatures and salinities. It can tolerate high temperatures up to 93 degrees F at 14 ppt salinity....
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Nov 24 2009 - Two common names lionfsh or…...

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