I’d raise a small quibble with the title - if ship noise reduces their ability to access food, it still is an access problem, just not an abundance problem.
"The study found noise from marine traffic can “mask” communication between orcas and interfere with their ability to hunt. The presence of large ships can also hamper their foraging efforts."
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They speculate ship traffic increase, but I wonder if microplastics are making them sick. There are just so many factors.