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Abstract
Acoustically
equipped deep-water mobile autonomous platforms can be used to survey
for marine mammals over intermediate spatiotemporal scales. Direct
comparisons to fixed recorders are necessary to evaluate these tools as
passive acoustic monitoring platforms. One glider and two drifting
deep-water floats were simultaneously deployed within a deep-water
cabled hydrophone array to quantitatively assess their survey
capabilities. The glider was able to follow a pre-defined track while
float movement was somewhat unpredictable. Fin whale (Balaenoptera physalus)
20 Hz pulses were recorded by all hydrophones throughout the two-week
deployment. Calls were identified using a template detector, which
performed similarly across recorder types. The glider data contained up
to 78% fewer detections per hour due to increased low-frequency flow
noise present during glider descents. The glider performed comparably to
the floats and fixed recorders at coarser temporal scales; hourly and
daily presence of detections did not vary by recorder type. Flow noise
was related to glider speed through water and dive state. Glider speeds
through water of 25 cm/s or less are suggested to minimize flow noise
and the importance of glider ballasting, detector characterization, and
normalization by effort when interpreting glider-collected data and
applying it to marine mammal density estimation are discussed.
Original language | English |
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Pages (from-to) | 961-977 |
Number of pages | 17 |
Journal | Journal of the Acoustical Society of America |
Volume | 147 |
Issue number | 2 |
Early online date | 10 Feb 2020 |
DOIs | |
Publication status | E-pub ahead of print - 10 Feb 2020 |
Keywords
- Statistical analysis
- Acoustic noise
- Aquatic ecology
- Animal communication
- Bioacoustics of mammals
- Electronic noise
- Oceanography
- Spectrograms
- Regression analysis
- Hydrophone
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Dive into the research topics of 'Comparison of fin whale 20 Hz call detections by deep-water mobile autonomous and stationary recorders'. Together they form a unique fingerprint.Projects
- 1 Finished
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Cetacean Density: A Framework for Cetacean density estimation using slow-moving underwater vehicles
Thomas, L. (PI)
1/04/15 → 31/03/18
Project: Standard