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Adaptive differentiation between populations of the same species would certainly fit the description of a dynamic phase in a taxon’s history. Although reasonable to expect temperature to be a major contributor to expression variance in an ectotherm, this does not rule out other environmental factors. Finally, we do not wish to espouse a pan-selectionist view of transcriptional divergence—far from it given that neutral divergence was predominant. Other nonadditive genetic effects (e.g., genetic maternal effects, epistasis) may contribute significantly to transcriptional variation. Our findings with respect to the number of transcripts with heritable variation in expression are, however, comparable with those from similar pedigree-based analyses. Nevertheless, they form one line of evidence which is consistent with selection on transcriptional variation playing a role in the process of adaptive differentiation in this system.