ArticleCade, William H.Major theories of sexual selection predict heritable variation in female preferences and male traits and a positive genetic correlation between preference and trait. Here we show that female Texas field crickets, Gryllus integer, have heritable geneti . . .
ArticlePollen transfer by hummingbirds and bumblebees, and the divergence of pollination modes in PenstemonWilson, Paul S.We compared pollen removal and deposition by hummingbirds and bumblebees visiting bird-syndrome Penstemon barbatus and bee-syndrome P. strictus flowers. One model for evolutionary shifts from bee pollination to bird pollination has assumed that, mostl . . .