Marine heat waves may be impacting one of the ocean’s major sources of food and shelter for sea life—kelp.

A recent study by SFU post-doctoral student Jordan Hollarsmith published in the Journal of Experimental Marine Biology and Ecology examined how giant kelp respond to increasingly warm and acidic oceans. Researchers found that in lab settings, high-latitude kelp completely failed to reproduce when stressed by heat.

Hollarsmith, who undertook the research as a graduate student at UC Davis, is now applying her expertise at Simon Fraser University, where she is working with biology chair and professor Isabelle Coté on strategies for managing stressors on kelp in the Salish Sea off B.C.’s southern coast. The researchers are bringing together various experts on local kelp, from scientists to First Nations groups, and will also work to determine what management actions might mitigate similar impacts on Salish Sea kelp.

“We found more resistance to elevated temperatures, with developmental failure in the early stages among high-latitude and Chilean populations, suggesting a greater vulnerability to climate-warming events,” she says.

She hopes the results will help to enhance our ability to predict how projected declines in ocean pH and increases in ocean temperature might trigger population extinctions and ecosystem range shifts.