The research is the first to look into the link between oxygen, temperature, and the metabolic needs of vertical migrators. Brad Seibel still recalls headlines from 20 years ago that sounded like they were taken from a B-rated science fiction film, such as 'Invasion of the jumbo squid in Monterey B
This study is the culmination of 20 years of research by Brad Seibel on vertical migrators that has included scores of dives like this one. Credit: Stephani Gordon, Open Boat Films.
Krill, shrimp-like crustaceans, provide a major food source for many marine animals – from fish to whales. Credit: Stephani Gordon, Open Boat FilmsCollege of Marine Science, recently published a paper inthat sheds light on those old headlines. It ties all the information he’s gathered on animal metabolism over the course of 20 years and seven research cruises in the Gulf of California, Mexico, and it opens up a new chapter in the tale of how certain creatures may adapt to the warming waters.
“Vertical migrators buck the basic narrative, which is based largely on studies of coastal animals,” Seibel said. That’s what likely happened 20 years ago in Monterey, Seibel said. An El Nino event temporarily brought warmer water to the coast. The warmer water allowed the squid to expand their range northward, where they took advantage of new food sources – heavily impacting the local fisheries — even though food was plentiful back in the more tropical latitudes.
Vertical migrators live very different lives than coastal species, which experience a fairly consistent supply of oxygen in waters well mixed with the atmosphere. Migrators live at depth during the day, where it’s cold and dark and there’s less oxygen, and they travel hundreds of meters toward the relatively warm ocean surface at night to eat, where oxygen is plentiful and when it’s safer to forage.
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