Coral larvae found to prefer a noisy environment

December 12, 2018 by Bob Yirka, Phys.org report
Settlement experiment deployed at the more degraded, less fish abundant Cocolaba reef in the US Virgin Islands. Credit: Amy Apprill, Woods Hole Oceanographic Institution

A team of researchers with the Woods Hole Oceanographic Institution has found that coral larvae prefer to set up a new home in a place noisy with other living organisms over a barren soundless site. In their paper published in the journal Royal Society Open Science, the group describes experiments they carried out around reefs in the Caribbean Sea and what they learned from them.

As humans continue to pump into the atmosphere, it not only heats up the planet, but causes the oceans to become more acidic. And as the oceans become more acidic, have begun dying. For that reason, ocean scientists have been studying them to learn more about their nature, hoping to find a way to save them. One such focus is trying to better understand the factors at play as coral larvae carried by moving water choose a spot to stop and set up new growth sites. Prior research has shown that such larvae are sensitive to temperature, light and chemicals produced by other creatures living in the sea.

To find out if sound might also play a role, the researchers placed 18 boxes (half of which had transparent walls) filled with water and coral larvae at three sites ranging from a healthy reef environment to a barren lifeless site. Each site was deemed to be equal in terms of natural light. The biggest difference between them, the team notes, was the amount of noise generated by the creatures already living there. In a bustling reef, there are a wide variety of low-frequency sounds. Barren sites, on the other hand, are usually devoid of all sound except for the high-frequency noise shrimp make.

The team left the boxes in place for two and a half days and then checked on them to see if the larvae had found the site suitable for setting up house. They report that 50 percent more larvae had settled into their new homes in the boxes placed in heavily populated, noisy areas. The findings indicate that coral also use sound as part of their decision-making when deciding where to settle. This finding also suggests that the could be induced to repopulate barren areas by setting up speakers in the vicinity to blast out noisy sounds.

Explore further: Biggest coral reseeding project launches on Great Barrier Reef

More information: Soundscapes influence the settlement of the common Caribbean coral Porites astreoides irrespective of light conditions, Royal Society Open Science (2018). royalsocietypublishing.org/doi/10.1098/rsos.181358

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