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Advancing phenology in response to global warming has been reported across biomes^,, raising concerns about the temporal uncoupling of trophic interactions^,. Concurrently, widely reported flower visitor declines have been linked to resource limitations. Phenological responses in the Arctic have been shown to outpace responses from lower latitudes and recent studies suggest that differences between such responses for plants and their flower visitors could be particularly pronounced in the Arctic^,. The evidence for phenological uncoupling is scant because relevant data sets are lacking or not available at a relevant spatial scale. Here, we present evidence of a climate-associated shortening of the flowering season and a concomitant decline in flower visitor abundance based on a long-term, spatially replicated (1996–2009) data set from high-Arctic Greenland. A unique feature of the data set is the spatial and …