“This feels like a once-in-humanity moment to preserve the future of life on the planet.”
in some places in the past quarter century. Areas of the sea completely devoid of oxygen have increased fourfold since the middle of the last century.
There are other shifts, some of them odd. Some crabs and squid struggle to see in low oxygen conditions. Many tiny zooplankton, food for larger creatures in the sea, already live at the very limits of their oxygen threshold and won’t likely survive more decreases without moving to new places. Low oxygen is reducing reproduction for some fish and increasing diseases in others.
“There are lots of good reasons to think we’re representing a global look and capturing a wide spectrum even though we’re only looking at a relatively small number of species,” Deutsch says. “Tropical species are more likely to survive because as warm, hypoxic conditions become globally widespread, these species are already adapted to those types of environments,” Penn says. “Cold, high O2 species have nowhere to go to seek refuge.” That same pattern—greater extinction risk for polar species—was also detected in the fossil record of the end-Permian extinction.
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