For green crabs, ship noise is like an anti–Barry White.
The constant thrum of ship engines and other human noises can be a real nuisance for many sea creatures, disrupting their feeding, navigation, and communication. NowTo date, most studies on marine noise pollution have focused on how it affects large marine mammals. Kara Rising, a graduate student in marine ecology at the University of Derby in England, however, was curious how it affects often-overlooked crustaceans.
Crab sex is more complicated than you might think. Shore crabs mate after the female has molted when her shell is still soft. The male rises up onto his legs and, with claws held outstretched, climbs onto the female’s back, wrapping his legs around her in a “love embrace,” says Rising. They stay that way for a couple of days, with the male protecting the vulnerable soft-shelled female until she is ready to release her eggs.
Carlos Duarte, a marine biologist at King Abdullah University of Science and Technology in Saudi Arabia, says the work adds to scientists’ growing understanding of how animals are affected by noise pollution. He says this study is particularly significant because it’s focused on an understudied species and because it looks at how noise affects a behavior with a direct effect on population dynamics.
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