Effective population size is positively correlated with levels of adaptive divergence among annual sunflowers.
Strasburg JL, Kane NC, Raduski AR, Bonin A, Michelmore R, Rieseberg LH. Effective population size is positively correlated with levels of adaptive divergence among annual sunflowers. Mol Biol Evol. 2011 May; 28(5):1569-80.