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References of the abstract :
In the context of climate change, increased damage to coral reefs causes an acceleration of the degradation of coral reef soundscapes impacting the attraction of fishes larvae. The ability for fishes larvae to use acoustic cues is known but the maximal detection distance of coral reef sounds is still unknown. Using drifting antennas (made of a floater and an autonomous recorder connected to a hydrophone), six transects were realized from the reef crest to 10 kilometers in the open ocean on Moorea island (French Polynesia), we estimated that the chorus created by the sounds of benthic invertebrates is a major contributor to the ambient noise at more than 90 kilometers under flat/calm sea state conditions and more than 50 kilometers with an average wind (6 knots wind regime), while fishes sounds can be detected up to less than two kilometers. These distances decrease when the wind or the ship traffic increase. Using audiograms of different taxa, we showed that fishes post-larvae likely hear the reef at distances up to 0.5 kilometers, while it is half this distance for invertebrates. Some cetaceans would be able to detect reefs up to more than seventeen kilometers. These results are essential to understand fishes larval recruitment and the effect of soundscape degradation on coral reef fishes.
