A University of Toronto Scarborough study reveals that ocean acidification, caused by climate change, impairs the sense of smell of economically important Dungeness crabs. This finding could partially explain the decline in their populations and may have significant consequences for the marine ecosy
A new University of Toronto Scarborough study finds that climate change is causing a commercially significant marine crab to lose its sense of smell, which could partially explain why their populations are thinning.
Ocean acidification is the result of the Earth’s oceans becoming more acidic due to absorbing increasing amounts of carbon dioxide in the atmosphere. It’s a direct consequence of burning fossil fuels and carbon pollution, and several studies have shown it’s having an impact on the behavior of marine wildlife.found along the Pacific coast, stretching from California to Alaska. They are one of the most popular crabs to eat and their fishery was valued at more than $250 million in 2019.
The researchers discovered two things when the crabs were exposed to ocean acidification: they were flicking less and their sensory neurons were 50 percent less responsive to odors. “These are active cells and if they aren’t detecting odors as much, they might be shrinking to conserve energy. It’s like a muscle that will shrink if you don’t use it,” she says.
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