Scientists are working to understand how climate change is affecting Dungeness crab, which is both culturally significant and a pillar of the Northwest seafood industry. Via seattletimes
SEATTLE — Terry “Chop” Arnold Jr. remembers the first few times he climbed in his dad’s 36-foot fishing boat at an old log boom, near the northernmost tip of Washington.
Not too far down the coast, piles of dead Dungeness crab washed ashore on Kalaloch Beach this summer. Meanwhile, fishers have shared stories about hoisting up dead or suffocating crabs in their pots, said Jenny Waddell, research ecologist with the Olympic Coast National Marine Sanctuary. Over the last 20 years, the Olympic Coast sanctuary in Washington has monitored a changing marine environment. Where there’s typically vertical mixing to distribute nutrients, at times ocean waters have become stratified, trapping oxygen-deficient, acidic waters against the seafloor, Waddell said.
Meanwhile, harmful algal blooms have led to complete and partial closures of Dungeness crab fisheries up and down the West Coast. The blooms are rapidly growing bunches of algae that can produce dangerous toxins. But scientists still don’t have a good handle on how organisms are affected by multiple stressors. What happens when crabs are faced with algal blooms, low oxygen and warm water?They plan to map out where the lowest concentrations of oxygen lie and where the warm water is, and find where these stressors intersect to make life even more hostile for the species, said Richard Feely, senior scientist at NOAA’s Pacific Marine Environmental Laboratory.
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