The thermal bottlenecks and the response to climate change in the complex life-history of intertidal ectotherms are not clearly defined. Our work tested the applicability of two major ecological and mechanistic hypotheses across life stages, latitudinal range and between respiratory media. We found that ontogenetic stage and local climate adaptations are significant factors to consider when evaluating the overall vulnerability of intertidal ectotherms to thermal stress. The evolutionary adaptation and capacity for dual breathing acquired throughout ontogeny by some intertidal ectotherms may represent an advantage in mitigating the effects of climate change in comparison to strictly water breathers.