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Theoretical detection ranges for acoustic based manatee avoidance technology.

Richard Phillips1, Christopher Niezrecki, Diedrich O Beusse

  • 1Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611-6250, USA.

The Journal of the Acoustical Society of America
|August 1, 2006
PubMed
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Acoustic warning systems can detect West Indian manatee (Trichechus manatus latirostris) vocalizations up to 250m in quiet waters. Detection range significantly decreases in noisy environments, impacting manatee protection efforts.

Area of Science:

  • Marine biology
  • Acoustics
  • Conservation technology

Background:

  • West Indian manatees (Trichechus manatus latirostris) are endangered, with watercraft collisions being a major threat in Florida.
  • Acoustic-based warning systems using manatee vocalizations are proposed to mitigate collisions.
  • The detection range of manatee vocalizations is crucial for the feasibility of such systems.

Purpose of the Study:

  • To theoretically analyze the detection capabilities of an acoustic manatee warning system.
  • To determine the effective detection range of manatee vocalizations under various noise conditions.
  • To establish hydrophone spacing requirements for acoustic manatee avoidance technologies.

Main Methods:

  • A mixed spreading model was used to analyze system detection capabilities.

Related Experiment Videos

  • Measured source levels of manatee vocalizations were combined with modeled habitat acoustic properties.
  • Detection ranges were calculated under different background and watercraft noise scenarios.

    • Main Results:

    • Manatee vocalizations are detectable up to approximately 250m in quiet environments (70 dB background noise).
    • Detection range drops significantly to 2.5m in louder environments (100 dB background noise).
    • In 90 dB background noise, boat noise (120 dB) limits detection to within 100m.

    Conclusions:

    • The detection range of manatee vocalizations is highly dependent on background noise levels and vocalization source levels.
    • Acoustic warning systems show potential but require careful consideration of environmental noise for effective implementation.
    • Further research into manatee vocalization source levels and habitat acoustics is needed to optimize avoidance technologies.