![]() Hulslander LC (2003) The evolution of the male threespine stickleback color signal. ![]() USGS Popular Publications, Denver, Colorado, 15 pp Hulsing H (1981) The breakout of Alaska’s Lake George. Higuchi M, Goto A, Yamazaki F (1996) Genetic structure of threespine stickleback, Gasterosteus aculeatus, in Lake Harutori, Japan, with reference to coexisting anadromous and freshwater forms. Hay DE, McPhail JD (1975) Mate selection in threespine sticklebacks ( Gasterosteus). Hagen DW, Gilbertson LG (1973) Genetics of plate morphs in freshwater threespine sticklebacks. Hagen DW, Gilbertson LG (1972) Geographic variation and environmental selection in Gasterosteus aculeatus in Pacific Northwest, America. Hagen DW (1967) Isolating mechanisms in threespine stickleback ( Gasterosteus). Thesis, University of Alaska Anchorage, Alaska, USA, 83 pp ![]() ![]() Science 307:1928–1933įurin CG (2006) The role of assortative mating between a recently derived resident-freshwater population of threespine stickleback ( Gasterosteus aculeatus) and its putative anadromous ancestor. Copeia 4:936–944Ĭolosimo PF, Hosemann KE, Balabhadra S, Villarreal G, Dickson M, Grimwood J, Schmutz J, Myers RM, Schluter D, Kingsley DM (2005) Widespread parallel evolution in sticklebacks by repeated fixation of ectodysplasin alleles. Evolution 58:814–824Ĭaldecutt WJ, Bell MA, Buckland-Nicks JA (2001) Sexual dimorphism and geographic variation in dentition of threespine stickleback, Gasterosteus aculeatus. Evolution 47:906–914īell MA, Aguirre WE, Buck NJ (2004) Twelve years of contemporary armor evolution in a threespine stickleback population. Copeia 2:314–325īell MA, Ortí G, Walker JA, Koenings JP (1993) Evolution of pelvic reduction in threespine stickleback fish: a test of competing hypotheses. Oxford University Press, Oxford, pp 1–27īell MA, Ortí G (1994) Pelvic reduction in threespine stickleback from Cook Inlet lakes: geographical distribution and intrapopulation variation. In: Bell MA, Foster SA (eds) The evolutionary biology of the threespine stickleback. Genetica 112:445–461īell MA, Foster SA (1994) Introduction to the evolutionary biology of the threespine stickleback. Oxford University Press, Oxford, pp 345–380īell MA (2001) Lateral plate evolution in the threespine stickleback: getting nowhere fast. These results therefore support the hypothesis of ecological speciation.Bakker TCM (1994) Evolution of aggressive behaviour in the threespine stickleback. The extent of reproductive isolation reached between dwarf and normal whitefish ecotypes appears to be driven by the potential for occupying distinct trophic niches and, thus, by the same selective forces driving tropic specialization in each lake. A negative correlation was observed between the extent of gene flow between ecotypes within a lake and that of their morphological differentiation in trophic-related traits. Significant but variable genetic divergence between ecotypes within lakes was also observed. Dwarf and normal ecotypes in each lake differed primarily by traits related to trophic specialization, but the extent of differentiation varied among lakes. Eight meristic variables, 19 morphometric variables, and six microsatellite loci were used to quantify morphological and genetic differentiation, respectively. John River basin (eastern Canada and northern Maine). We tested this hypothesis by comparing the extent of morphological and genetic differentiation between sympatric dwarf and normal whitefish ecotypes ( Coregonus sp.) from six lakes of the St. If the same forces driving phenotypic divergence are also responsible for speciation, one would predict a correlation between the extent of trophic specialization (reflecting variable intensity of divergent natural selection) and that of reproductive isolation being reached in a given environment. In contrast, the role of ecological forces in favoring and maintaining reproductive isolation in nature remains poorly understood. There is ample empirical evidence that phenotypic diversification in an adaptive radiation is the outcome of divergent natural selection related to differential resource use.
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