PMID: 16526499Mar 11, 2006Paper

Nonrandom larval dispersal can steepen marine clines

Evolution; International Journal of Organic Evolution
Matthew P HareWilliam F Fagan

Abstract

Sharp and stable clinal variation is enigmatic when found in species with high gene flow. Classical population genetic models treat gene flow as a random homogenizing force countering local adaptation across habitat discontinuities. Under this view, dispersal over large spatial scales will lower the effectiveness of adaptation by natural selection at finer spatial scales. Thus, random gene flow will create a shallow phenotypic cline across an ecotone in response to a steep selection gradient. In sedentary marine species that disperse primarily as larvae, nonrandom dispersal patterns are expected due to coastal hydrodynamics. Surprisingly sharp phenotypic and genotypic clines have been documented in marine species with high gene flow. We are interested in the extent to which nonrandom dispersal could accentuate such clines. We model a linear species range in which populations have stable and uniform densities along a selection gradient; in contrast to random dispersal, convergent advection of larvae can amplify phenotypic differentiation if coupled with a semipermeable dispersal barrier in the convergence zone. The migration load caused by directional dispersal pushes the phenotypic mean away from the local trait optimum in down...Continue Reading

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Citations

Jul 13, 2007·Journal of the Royal Society, Interface·Michael N Dawson, William M Hamner
Sep 23, 2008·Molecular Ecology·Winsor H LoweBradley J Cosentino
Mar 1, 2010·Evolutionary Applications·Andrew R Kanarek, Colleen T Webb
Jul 8, 2016·Ecology and Evolution·Christine Ewers-SaucedoJohn P Wares

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