Last call: Passive acoustic monitoring shows continued rapid decline of critically endangered vaquita

The vaquita is a critically endangered species of porpoise. It produces echolocation clicks, making it a good candidate for passive acoustic monitoring. A systematic grid of sensors has been deployed for 3 months annually since 2011; results from 2016 are reported here. Statistical models (to compen...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2017-11, Vol.142 (5), p.EL512-EL517
Main Authors: Thomas, Len, Jaramillo-Legorreta, Armando, Cardenas-Hinojosa, Gustavo, Nieto-Garcia, Edwyna, Rojas-Bracho, Lorenzo, Ver Hoef, Jay M., Moore, Jeffrey, Taylor, Barbara, Barlow, Jay, Tregenza, Nicholas
Format: Article
Language:English
Subjects:
Acoustics - instrumentation
Animals
Echolocation - classification
Endangered Species
Environmental Monitoring - instrumentation
Environmental Monitoring - methods
Population Density
Porpoises - classification
Porpoises - psychology
Signal Processing, Computer-Assisted
Time Factors
Transducers
Vocalization, Animal - classification
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Summary:The vaquita is a critically endangered species of porpoise. It produces echolocation clicks, making it a good candidate for passive acoustic monitoring. A systematic grid of sensors has been deployed for 3 months annually since 2011; results from 2016 are reported here. Statistical models (to compensate for non-uniform data loss) show an overall decline in the acoustic detection rate between 2015 and 2016 of 49% (95% credible interval 82% decline to 8% increase), and total decline between 2011 and 2016 of over 90%. Assuming the acoustic detection rate is proportional to population size, approximately 30 vaquita (95% credible interval 8–96) remained in November 2016.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.5011673