Response to Comment on "Divergent Induced Responses to an Invasive Predator in Marine Mussel Populations"

Preliminary DNA analysis indicates that only a few Mytilus trossulus mussels were present in our study of M. edulis . Excluding these M. trossulus did not influence the outcome of our analyses. Our study provides essential evidence that populations of M. edulis respond differently to the two crab predators, and the adaptive significance of shell thickening in mollusks is well established.