>>On average, tropical marine creatures have a safety margin of 10 degrees Celsius. “That sounds like a lot,” Pinsky tells Nunez, “but the key is that populations actually go extinct long before they experience 10 degrees of warming.” In fact, Pinsky notes, just a degree or half-degree shift can dramatically impact such animals’ food-finding skills and reproduction abilities.

While some marine creatures can escape the heat by migrating to colder waters, others have fewer options: As Mashable’s Kaufman observes, surface-dwelling fish can’t simply move to the deep ocean and expect to thrive or even survive. The same is true of marine animals living in the shallow waters off of continental shelves, Bob Berwyn adds for InsideClimate News. And these species, as well as ones forced to flee their long-time habitats, are far from obscure ones likely to have no impact on humans’ livelihood; many, including halibut and winter founder, serve as key food sources for coastal communities.<<

https://www.smithsonianmag.com/smart-news/ocean-dwelling-species-are-disappearing-twice-quickly-land-animals-180972040/