standing variation

Hancock AM, Brachi B, Faure N, Horton MW, Jarymowycz LB, Sperone FG, Toomajian C, Roux F & Bergelson J 2011 Adaptation to climate across the Arabidopsis thaliana genome. Science 334:83-86.

• selective sweeps are likely an important mode of adaptation in A. thaliana
• species like A. thaliana may reach adaptive limits under rapid climate change, owing to the constraints imposed by waiting for new mutations