Discarded tires in the oceans are trapping hermit crabs, with no way out

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Hermit crabs are finding their way into discarded tires in the ocean -- and they can't get out, a new study from Hirosaki University found.

The concave interior of a car tire can trap hermit crabs that go there in search of food and shelter. The study refers to this phenomenon -- when marine animals get caught in human litter, such as fishing nets -- as"ghost fishing."

The hermit crab shells found in this survey were heavily damaged, and researchers suggested this was a sign of cannibalism or competition for lodging among hermit crabs that were stuck. "If we were to lose these crab species or they were able to become substantially less abundant, that has implications for sediment turnover. It has implications for forest regeneration and growth. It has implications for the tidiness of our beach and ocean environments because potentially you don't have the vultures coming in and cleaning things up," Lavers said.

Other forms of ocean and beach pollution, such as plastic bottles and containers, are also harming hermit crabs. Lavers led a 2019 study in the Cocos Islands that found hermit crabs were confusing plastic containers for shells, which trapped one or two crabs every square meter. She said the new study from Hirosaki University expands research on entrapment to another part of the world, illustrating a problem"more widespread than we originally thought.

 

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