The 2014–2016 marine heatwave transformed the ecosystem of the northeast Pacific. Some of those changes seem here to stay.
By 2017, the Blob had waned and many of these more tropical species had retreated. Yet not all. Some of the species that colonized new habitats during the heatwave have stuck around. And now, says Joshua Smith, a marine ecologist at the Monterey Bay Aquarium in California who documented in how the Blob triggered a range of subtle yet persistent shifts in the spread of marine species, “I’m starting to sort of question whether those communities will ever look the way they did.
Señorita fish, for example—a bright-orange wrasse that showed up in huge numbers in central California during the heatwave—are still there, Smith says. Ocean whitefish, while historically common around Southern California’s Channel Islands, are now dominant, Caselle says, while California sheephead, a bulbous red-and-black fish, are now also much more abundant near Santa Barbara.
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