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Globally, species are undergoing range shifts in response to climate change. However, the potential impacts of climate-driven range shifts are not well understood. In southern California, the predatory whelk  Mexacanthina lugubris  has undergone a northward range shift of more than 100 km in the past four decades. We traced the history of the whelk’s range shift and assessed potential effects using an integrated approach, consisting of field surveys, as well as feeding and thermotolerance experiments. We found that at sites where  Mexacanthina  and native species co-occurred, native whelks distributions peaked lower in the intertidal. In laboratory experiments, we found that the presence of  Mexacanthina  led to reduced growth in native whelks ( Acanthinucella spirata ). Additionally, the range-shifting whelk was able to tolerate higher temperatures than common native species ( A. spirata  and  Nucella emarginata ), suggesting further impacts as a result of climate warming. Many species are likely to undergo range shifts as a coping mechanism for changing climatic conditions. However, communities are unlikely to shift as a whole due to species-specific responses. By studying the impacts of range-shifting species, like  Mexacanthina , we can better understand how climate change will alter existing community structure and composition.

Dynamic species interactions associated with the range-shifting marine gastropod Mexacanthina lugubris