Reply to Robson et al.

Robson et al.'s commentary on our article, 'Floral pigmentation has responded rapidly to global change in ozone and temperature', questions the study's conclusion that floral ultraviolet (UV) pigmentation has responded to global change, particularly to total column ozone (TCO). Robson et al. claim that our study spanned a time frame in which ozone was not declining and suggest no biological relationship between UV-B exposure and UV floral pigmentation. To support their claims, they selectively remove and reanalyze data. We respond with a critique of their interpretations of our results, and analyses of temporal patterns of TCO data from Koski et al.. Despite Robson et al.'s concerns, our study continues to support a link between temporal changes in ozone and temperature, and temporal changes in UV floral pigmentation.