Adaptive Responses of Marine Gastropods to Heatwaves

Under climate change, many species are increasingly exposed to heatwaves, including marine species. Although marine species are expected to succumb to heatwaves, there is increasing interest in understanding why some can persist. As heatwaves can greatly elevate intertidal seawater temperature, we explore reasons for variation in biological performance to acute thermal stress among three species of intertidal gastropods. When thermal refuges were unavailable for adaptive behavior, we show that their biological performance (feeding rate) was either maintained (resistant), recovered from a decline (resilient), or collapsed (sensitive), depending on the strength of molecular defense (where resistant species > resilient species > sensitive species). The integration of molecular, physiological, and behavioral responses within a species illustrates the kind of adaptive capacity that allows organisms to survive heatwaves and maintain their ecological functions. In this era of unprecedented environmental change, understanding how organisms persist seems as important as understanding how organisms perish.