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

PLoS One. 2021 Jul 13;16(7):e0254614. doi: 10.1371/journal.pone.0254614. eCollection 2021.

Abstract

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.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Bays*
  • Cyclonic Storms
  • Ecosystem
  • Fishes / physiology*
  • Florida
  • Gulf of Mexico
  • Sound*

Grants and funding

The work was supported by NOAA Ernest F. Hollings Undergraduate Scholarship (awarded to A.D.B. | https://www.noaa.gov/office-education/hollings-scholarship). Development and construction of the Digital SpectroGram recorders built in this study was supported by a grant (awarded to P.S.) from the National Oceanographic Partnership Program (OCE-0741705 | https://www.nopp.org). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. The funder, Loggerhead Instruments (Sarasota, Florida, United States of America), provided support in the form of salaries for authors D.M., but did not have any additional role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. The specific roles of these authors are articulated in the ‘author contributions’ section.