Marine heatwaves are harming human health in surprising ways

Marine heatwaves pose significant risks to human health, according to new research. Researchers from Adelaide University and the University of Hong Kong argue that the effects on people have been largely overlooked despite evidence showing how widely these events can impact communities. In South Australia, an algal bloom linked to marine heatwaves has caused numerous health problems.

The study highlights how marine heatwaves can lead to more severe weather, reduced seafood availability, threats to food safety, disrupted livelihoods, and increased mental health pressures in coastal areas. The paper explains that sustained periods of unusually warm ocean temperatures can trigger a chain of consequences for people.

These include intensifying storms and atmospheric heatwaves, affecting seafood availability and safety, disrupting livelihoods, and contributing to anxiety, grief, and other mental health impacts. As marine heatwaves become more frequent, longer-lasting, and more intense due to climate change, their human health implications are growing.

The authors urge governments and public health agencies to prepare for these events similarly to how they prepare for land-based heatwaves. This includes using marine heatwave forecasts in public health planning, considering human health consequences in coastal and marine management decisions, and strengthening collaboration among ocean scientists, health agencies, and resource managers.