Graduate Thesis Or Dissertation
 

Biochemical genetics of geographically separated populations of wood boring isopods of the genus Limnoria (Flabellifera, Isopoda)

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  • Allozyme variation was studied electrophoretically for twelve presumptive gene loci within and between four species in the genus Limnoria and one species in the cofamilial genus Phycolimnoria. The species studied were L. tripunctata, L. tuberculata, L. quadripunctata, L. lignorum, and P. algarum. All of these species were clearly differentiated on the bases of allozymes. Populations of L. tripunctata from the west coast of North America exhibited a latitudinal allelic dine at three loci, Mdh-2, Got-2 and Gpi. It is hypothesized that temperature related selection at one or more of these loci, or at another linked locus we have not studied, is responsible for the allelic dine. Geographically separated populations of L. tripunctata not from the west coast of North America had allelic frequencies at these three loci consistent with this hypothesis. Populations of L. lignorum from the Atlantic and Pacific Oceans, and from opposite sides of the Pacific Ocean, were genetically differentiated using allozymes. This differentiation could be due to a combination of random genetic processes and natural selection The two populations of L. quadripunctata studied, both from the northern Californian coast, were essentially identical at the twelve loci studied.
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