The Dungeness crab is likely to be seriously affected in multiple ways by climate change over the coming decades, researchers say, battling everything from rising shell-damaging ocean acidity to low oxygen levels.
Late last year, researchers from the London School of Economics and Political Science released a U.K. government–commissioned report concluding strong evidence that some invertebrates are sentient.
The authors’ conclusions suggest octopuses have some kind of memory-based inner lives and crabs can indeed be crabby. The researchers modelled how climate is changing the environment within the massive ocean current that flows northwards from California to the outer coast of Vancouver Island. The changes, the researchers recently reported in the journal Global Change Biology, are having knock-on effects within the highly productive coastal marine ecosystem in that underwater ocean superhighway.
Global carbon emissions drive three main marine stressors — ocean acidification, warming water temperatures and low oxygen levels. The study suggests acidification will have the biggest, most widespread impact on the species. A 2020 study found that increased ocean acidity was already damaging the upper shells and the hair-like sensory structures that larval Dungeness crabs use to swim and avoid predators.
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