Data for: Simulated climate change causes asymmetric responses in insect life history timing potentially disrupting a classic ecological speciation system

Climate change may alter phenology within populations with cascading
consequences for community interactions and ongoing evolutionary
processes. Here, we measured the response to climate change in two
sympatric, recently diverged (~170 years) populations of Rhagoletis
pomonella flies specialized on different host fruits (hawthorn and apple)
and their parasitoid wasp communities. We tested whether warmer
temperatures affect dormancy regulation and its consequences for synchrony
across trophic levels and temporal isolation between divergent
populations. Under warmer temperatures, both fly populations developed
earlier. However, warming significantly increased the proportion of
maladaptive pre-winter development in apple, but not hawthorn, flies.
Parasitoid phenology was less affected, potentially generating ecological
asynchrony. Observed shifts in fly phenology under warming may decrease
temporal isolation, potentially limiting ongoing divergence. Our findings
of complex sensitivity of life-history timing to changing temperatures
predict that coming decades may see multifaceted ecological and
evolutionary changes in temporal specialist communities.