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Related Experiment Video

Updated: Mar 31, 2026

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A severe red tide (Tampa Bay, 2005) causes an anomalous decrease in biological sound.

Katherine L Indeck1, Peter Simard2, Shannon Gowans1

  • 1Eckerd College, 4200 54th Avenue South , St. Petersburg, FL 33711, USA.

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|October 17, 2015
PubMed
Summary

Harmful algal blooms (HABs) altered ambient noise in Tampa Bay. Noise levels were lower during a severe HAB event, suggesting impacts on marine life sounds.

Keywords:
Karenia brevisacousticsambient noisefish chorusingharmful algal bloomsnapping shrimp

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Area of Science:

  • Marine Biology
  • Acoustic Ecology
  • Environmental Science

Background:

  • Harmful algal blooms (HABs) are recognized for causing marine organism mortality and morbidity.
  • Sublethal effects of HABs on marine ecosystems, particularly acoustic environments, remain poorly understood.
  • Understanding these effects is crucial for assessing the full ecological impact of HABs.

Purpose of the Study:

  • To investigate and compare ambient noise levels during a severe harmful algal bloom (HAB) event.
  • To contrast these noise levels with those recorded during non-HAB periods in Tampa Bay, Florida.
  • To explore potential links between HABs and alterations in marine soundscapes.

Main Methods:

  • Employed passive acoustic monitoring using autonomous, bottom-mounted acoustic recorders.
  • Collected data during a severe HAB in summer 2005.
  • Collected comparative data during non-severe HAB years: summers 2006, 2011, and 2012.

Main Results:

  • Ambient noise levels were significantly higher during non-HAB years compared to the severe HAB year.
  • Increased noise during non-HAB periods was attributed to abundant snapping shrimp (Alpheidae) sounds and fish chorusing.
  • The observed difference in sound intensity suggests HABs affect marine animal populations and behavior.

Conclusions:

  • Severe harmful algal blooms (HABs) can lead to a significant reduction in ambient noise levels in marine environments.
  • This acoustic dampening is likely due to HAB-induced mortality and stress-related behavioral changes in fish and snapping shrimp.
  • Findings highlight the sublethal acoustic impacts of HABs, underscoring the need for further research into these ecological consequences.