首页|Genetic basis for body size variation between an anadromous and two derived lacustrine populations of threespine stickleback Gasterosteus aculeatus in southwest Alaska

Genetic basis for body size variation between an anadromous and two derived lacustrine populations of threespine stickleback Gasterosteus aculeatus in southwest Alaska

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Body size is a highly variable trait among geographically separated populations.Size-assortative reproductive isolation has been linked to recent adaptive radiations of threespine stickleback (Gasterosteus aculeatus) into freshwater,but the genetic basis of the commonly found size difference between anadromous and derived lacustrine sticklebacks has not been tested.We studied the genetic basis of size differences between recently diverging stickleback lineages in southwest Alaska using a common environment experiment.We crossed stickleback within one anadromous (Naknek River) and one lake (Pringle Lake) population and between the anadromous and two lake populations (Pringle and JoJo Lakes),and raised them in a salinity of 4-6 ppt.The F1 anadromous and freshwater forms differed significantly in size,whereas hybrids were intermediate or exhibited dominance toward the anadromous form.Additionally,the size of freshwater F1s differed from their wild counterparts,with within-population F1s from Pringle Lake growing larger than their wild counterparts,while there was no size difference between lab-raised and wild anadromous fish.Sexual dimorphism was always present in anadromous fish,but not in freshwater,and not always in the hybrid crosses.These results,along with parallel changes among anadromous and freshwater forms in other regions,suggest that this heritable trait is both plastic and may be under divergent and/or sexual selection.

adaptationbody sizecommon gardengenetic basisthreespine stickleback

Ella BOWLES、Rebecca A.JOHNSTON、Stevi L.VANDERZWAN、Sean M.ROGERS

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Department of Biological Sciences, University of Calgary, 2500 University Dr.N.W., Calgary, Alberta, T2N 1N4, Canada

Funding was provided by a Discovery Grant (to SMR) and Postgraduate Scholarships (to E.B.and S.L.V.) from the Natural Sciences aAssociation of Canadian Universities for Northern Studies Garfield Weston Foundation (to E.B.)Arctic Institute Northern Scientific Training Program (to E.B.)

2016

10.1093/cz/zov007

动物学报(英文版)
中国科学院动物研究所,中国动物学会

动物学报(英文版)

CSCDSCI
影响因子：0.198
ISSN：1674-5507
年,卷(期)：2016.62(1)
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