4.6 Article

Tropical Storm Debby: Soundscape and fish sound production in Tampa Bay and the Gulf of Mexico

Journal

PLOS ONE
Volume 16, Issue 7, Pages -

Publisher

PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0254614

Keywords

-

Funding

  1. NOAA Ernest F. Hollings Undergraduate Scholarship
  2. National Oceanographic Partnership Program [OCE-0741705]
  3. Loggerhead Instruments (Sarasota, Florida, United States of America)

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Tropical cyclones have large effects on marine ecosystems through direct and indirect effects. During storms, ambient noise levels significantly increase, some fish call rates decrease while others show no significant reaction. Storms may elicit a behavioral response from the fish community, and further studies are needed to understand the ecological effects of tropical cyclones.
Tropical cyclones have large effects on marine ecosystems through direct (e.g., storm surge) and indirect (e.g., nutrient runoff) effects. Given their intensity, understanding their effects on the marine environment is an important goal for conservation and resource management. In June 2012, Tropical Storm Debby impacted coastal Florida including Tampa Bay. Acoustic recorders were deployed prior to the storm at a shallow water location inside Tampa Bay and a deeper water location in the Gulf of Mexico. Ambient noise levels were significantly higher during the storm, and the highest increases were observed at lower frequencies (<= 500 Hz). Although the storm did not directly hit the area, mean ambient noise levels were as high as 13.5 dB RMS above levels in non-storm conditions. At both the shallow water and the deep water station, the rate of fish calls showed a variety of patterns over the study period, with some rates decreasing during the storm and others showing no apparent reaction. The rates of fish calls were frequently correlated with storm conditions (storm surge, water temperature), but also with lunar cycle. Reactions to the storm were generally stronger in the inshore station, although fish sounds increased quickly after the storm's passage. Although this was not a major tropical cyclone nor a direct hit on the area, the storm did appear to elicit a behavioral response from the fish community, and ambient noise levels likely limited the abilities of marine species to use sound for activities such as communication. Given the increases in intensity and rainfall predicted for tropical cyclones due to climate change, further studies of the ecological effects of tropical cyclones are needed.

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