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Crayfish call louder as ocean temperatures rise: study

A new study has found that as oceans around the world become warmer due to climate change, the sound of shrimp catches is becoming louder than usual, creating “far-reaching effects” on the oceans. different marine ecosystems.

Researchers at the US-based Woods Hole Oceanographic Institution (WHOI) say the study is the first of its kind to look at the relationship between rising temperatures and the frequencies and volumes of two squirming shrimp.

The paper, published Thursday in the journal Frontiers in Marine Science, was able to demonstrate a clear relationship between these two factors and concludes that increased temperatures increase shrimp chirping.

Mantis shrimp are known to be one of the noisiest marine animals and are found widely throughout tropical and temperate seas. According to a website from the University of Rhode Island’s College of Oceanography, their “snap” is a sound made when they quickly open and close their claws, as a way to stun them. prey, distract predators, and even communicate with each other.

Researchers at WHOI describe the sound as a “spreading crackle, sounding like a bacon frying.”

Ashlee Lillis, co-author of the paper, said: “These shrimp are the most common sound-producing species in the ocean and now we have evidence that temperature has a huge impact on behavior. and the overall acoustic landscape,” said Ashlee Lillis, co-author of the paper.

“That involves everything from migrating whales to larvae attempting to use the acoustic landscape or humans using the sea for mining or military purposes.”

The vessel’s fish-finding devices and sonar are both affected by the constant humming noises generated when catching shrimp because their high volume covers such a broad spectrum of sounds, the researchers say. rescue said. According to research, whales and dolphins can also use the sound of shrimp to help them find their way to shore.

In addition, various types of sounds are known to attract fish, shellfish and coral larvae to suitable settlement areas.

Lilis examined recordings of shrimp capture from a reef off the coast of North Carolina and found that for every one degree Celsius increase in temperature, there was a one to two decibels increase in frequency and frequency. fish catch increased from 15 to 60%.

When tested in a controlled environment, it was found that the shooting frequency doubled when the water temperature was between 20C and 30C, with some variation depending on the season or social group of the shrimp.

It remains unclear whether shrimp will eventually adjust or how increased fishing will affect their physiology or environment in the long-term, as the experiments only simulated the effects of a single, the researchers say. brief heatwave, the researchers said.

“Climate change is impacting the marine landscape in fundamental ways,” said T. Aran Mooney, co-author of the study, in a statement.

“Warming water could affect how animals can communicate and use sound to reproduce and attract mates. We still don’t know what will happen to the ecosystem when ambient noise levels are higher, but there are far-reaching effects.”

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