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Genetic basis for body size variation between an anadromous and two derived l.custrine popul.tions of threespine stickl.back Gasterosteus acul.atus in southwest Al.ska

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Current Zool.gy 2016年第1期62卷 71-78页

作者： El.a BOWl.S Rebecca A. JOHNSTON stevi l. va.derzwa. Sean M. ROGERS Department of Biol.gical.Sciences University of Calgary 2500 University Dr. N.W. Calgary Alberta T2N 1N4Canada

Body size is a highl. variabl. trait among geographical.y separated popul.tions. Size-assortative reproductive isol.tion has been l.nked to recent adaptive radiations of threespine stickl.back （Gasterosteus acul.atus） into freshwater, but the genetic basis of the commonl. found size differ- ence between anadromous and derived l.custrine stickl.backs has not been tested. We studied the genetic basis of size differences between recentl. diverging stickl.back l.neages in southwest Al.ska using a common environment experiment. We crossed stickl.back within one anadromous （Naknek River） and one l.ke （Pringl. l.ke） popul.tion and between the anadromous and two l.ke popul.tions （Pringl. and JoJo l.kes）, and raised them in a sal.nity of 4-6 ppt. The F1 anadromous and freshwater forms differed significantl. in size, whereas hybrids were intermediate or exhibited dominance toward the anadromous form. Additional.y, the size of freshwater Fl. differed from their wil. counterparts, with within-popul.tion Fl. from Pringl. l.ke growing l.rger than their wil. counterparts, whil. there was no size difference between l.b-raised and wil. anadromous fish. Sexual.dimorphism was al.ays present in anadromous fish, but not in freshwater, and not al.ays in the hybrid crosses. These resul.s, al.ng with paral.el.changes among anadromous and fresh- water forms in other regions, suggest that this heritabl. trait is both pl.stic and may be under di- vergent and/or sexual.sel.ction.

关键词： adaptation body size common garden genetic basis threespine stickl.back.

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