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Ocean Heatwaves: Marine Animals Face Deadly Risks
21 Jun
Summary
- El Niño intensifies marine heatwaves, threatening sea life.
- Warming oceans disrupt food webs, increasing disease and starvation.
- Toxic algal blooms and ship strikes pose new dangers to marine animals.
El Niño is intensifying marine heatwaves, posing significant risks to marine animals worldwide. These prolonged periods of unusually high ocean temperatures disrupt food webs, increase disease susceptibility, and threaten the survival and reproduction of numerous species.
Experts from NOAA and the Aquarium of the Pacific have highlighted the severe impacts expected off Southern California. Rising ocean temperatures can weaken nutrient upwelling, reduce phytoplankton, and affect entire food chains, while warmer waters may also alter species distribution.
Concerns are mounting over toxic algal blooms, such as those causing domoic acid poisoning, which affects top predators. Recent findings of this biotoxin in deceased humpback whales underscore the immediate danger.
Historically, marine heatwaves, often coinciding with El Niño, have led to catastrophic events. Massive seabird die-offs, due to starvation from prey scarcity, and widespread reproductive failure have been documented. These conditions also exacerbate human-wildlife conflicts, increasing risks from ship strikes and fishing gear entanglement.
The National Marine Fisheries Service notes that warming impacts commercial species too, causing shifts in their populations and affecting fisheries in traditional areas.
