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Picture a coral reef. Even if you're not an avid snorckler or diver, chances are that movies

and childhood trips to the aquarium have given you some sense of how vibrant and lively these ecosystems can be.

Maybe you've even seen photos of what happens to a reef when it loses that vitality,

something that's becoming increasingly common due to bleaching events and other ecological disasters.

But do you know what a sick reef sounds like?

For Scientific American Science Quickly, I'm Rachel Feldman.

According to today's guest, a reef at its peak sounds something like this.

But when a reef falls on hard time, reef at its peak sounds something like this.

But when a reef falls on hard times, things can go awfully quiet.

I'm joined today by conservation bioacoustics researcher Ila Kaysha Davidson,

who studies the changing soundscape of the sea.

So, Dr. Davidson, why is it important that we listen to the sound of a coral reef?

It's quite an exciting space when you think about how far our understanding and learning has come for the ocean in general, but then coral reefs in particular,

if you think about how Jacques Cousteau described the oceans as the silent world in the sort of 1950s, and we're starting to learn more and more about how actually they're hardly silent.

They're incredibly acoustically diverse, and coral reefs are a particularly loud and diverse set of sounds

that you can hear but also they're really interesting and important ecosystems to understand

they don't cover a whole lot of the planet's surface about 0.1 but a quarter of all marine species that we know depend on coral reefs at some

...