Listen to aquatic life

In the Mediterranean, up to 90 percent of a particular recording may not be identified.

When marine researchers began recording sounds in the Mediterranean seagrass meadows, they picked up a mysterious sound that echoed in dense foliage, like the bark of a frog.

“We recorded over 30 seagrass, but it’s always there and no one knew the species that produced this morus alba! Morus alba! Morus alba.” Researcher Lucia DiIorio said.

“It took me three years to find the seed that made that sound.”

Whale melodious songs may be familiar to the underwater dwellers of the world, but most have heard the hazy grunts of striped garnards and the rhythmic drum beats of red piranha. not here.

Scientists are now calling for more widespread use of these sounds and even thousands of them.

They say a global database of ocean booms, whistles and chattering helps monitor diversity. Aquatic life— And help name the mysterious sounds that Di Iorio and her colleagues have investigated.

Experts from nine countries are working on what they call the Global Library of Underwater Biological Sounds (“GLUBS”).

This will collect recordings from around the world for use in artificial intelligence learning and mobile phone apps. Citizen scientist..

Experts have listened to underwater life for decades, but the team behind GLUBS says audio collections tend to focus narrowly on specific species or geographic areas.

Their initiative is part of a fast-growing work on the ocean’s “soundscape.” It collects all sounds from a particular area to identify information about species species, behavior, and overall biodiversity.

Scientists say these soundscapes are a non-invasive way to “spy” life underwater.

In a recently published paper in the journal Frontiers in Ecology and Evolution, the GLUBS team said a lot. fish Also, aquatic invertebrates are predominantly nocturnal or difficult to find, so acoustic monitoring may be useful in conservation activities.

“As biodiversity declines around the world and humans are constantly changing the landscape of underwater sounds, document, quantify, and understand the sources of sounds before the sounds of underwater animals disappear. “We need to do this,” said Miles Parsons, lead author of the Australian Institute of Marine Science.

Sonic “barcode”

Scientists believe that all 126 marine mammal species make noise, as do at least 100 aquatic invertebrates and about 1,000 aquatic invertebrates. Fish species..

Sound can convey a variety of messages as part of mating and breeding, as a defense mechanism, to warn others of danger. Alternatively, it can be a passive sound of an animal munching on a meal.

DiIorio, co-author of the GLUBS paper, said that marine mammals such as humans learn the language of communication, but the sounds produced by invertebrates and fish are “mere anatomical structures.”

Many fish use the muscles that contract around the float to make a unique drum sound.

“This damn-damn-damn-damn, frequency, rhythm, and pulse rate vary from species to species. This is very specific,” Di Iorio told AFP.

“It’s like a barcode.”

Scientists can recognize fish families from these sounds, so a global library could be used to compare, for example, the barking of various groupers in the Mediterranean with the barking of fish off the coast of Florida.

But another important use of libraries, they say, can help identify many unknown sounds in the world’s oceans and freshwater habitats.

Mystery music

After months of investigating the strange seagrass bark, Di Iorio and her colleagues were able to point their suspicious fingers at the scorpion fish.

But they had a hard time explaining how it made such an unusual noise — and it refused to play for them.

They caught a fish and tried to record it in their career. They sank the audio equipment to the bottom of the sea next to the fish. They also listened to the aquarium where the scorpion fish are.

“There is nothing,” she said.

Eventually, a Belgian colleague took a camera that could record in the dark and stakeout seagrass on Corsica.

They were able to catch the morus alba! Morus alba! Sounds and videos of fish in shimmy movement.

Returning to the lab, they dissected the scorpion fish and found that the tendons were stretched along their bodies.

Their hypothesis is that the fish contract these muscles and make a sound.

“It’s a guitar, an underwater guitar,” said Di Iorio.

But there are more mysteries as to where it came from.

Di Iorio said in the Mediterranean, up to 90 percent of the noise in a particular recording could be unknown.

“Every time I put the underwater listener in the water, I find a new sound,” she added.

The Global Library of Underwater Biological Sounds (GLUBS) uses audio to monitor changing marine life.

© 2022 AFP

Quote: Mystery and Music: Listen to Underwater Creatures (February 18, 2022) February 18, 2022

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