Multiscale spatio-temporal patterns of boat noise on U.S. Virgin Island coral reefs

Last modified: 
December 13, 2019 - 1:36pm
Type: Journal Article
Year of publication: 2018
Date published: 11/2018
Authors: Jason Dinh, Justin Suca, Ashlee Lillis, Amy Apprill, Joel Llopiz, Aran Mooney
Journal title: Marine Pollution Bulletin
Volume: 136
Pages: 282 - 290
ISSN: 0025326X

Sound-sensitive organisms are abundant on coral reefs. Accordingly, experiments suggest that boat noise could elicit adverse effects on coral reef organisms. Yet, there are few data quantifying boat noise prevalence on coral reefs. We use long-term passive acoustic recordings at nine coral reefs and one sandy comparison site in a marine protected area to quantify spatio-temporal variation in boat noise and its effect on the soundscape. Boat noise was most common at reefs with high coral cover and fish density, and temporal patterns reflected patterns of human activity. Boat noise significantly increased low-frequency sound levels at the monitored sites. With boat noise present, the peak frequencies of the natural soundscape shifted from higher frequencies to the lower frequencies frequently used in fish communication. Taken together, the spectral overlap between boat noise and fish communication and the elevated boat detections on reefs with biological densities raises concern for coral reef organisms.

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