| DECAF - Density Estimation for Cetaceans from Passive Acoustic Fixed Sensors |
Jan 2010 |
9 pages |
| Authors:
Len Thomas; Tiago Marques; David Borchers; Catriona Harris; David Moretti; Ronald Morrissey; Nancy DiMarzio; Jessica Ward; David Mellinger; Steve Martin; Peter Tyack; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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 | Determining the spatial density and distribution of cetacean (whale and dolphin) species is fundamental to understanding their basic biology, and also to monitoring and mitigating the effect of man-made impacts on their populations. However, this task is difficult because most cetacean species occur at low density and over enormous areas, and because they spend relatively little time at the surface where they can be seen using standard, visual surveys. Our ... |
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| DECAF - Density Estimation for Cetaceans from passive Acoustic Fixed Sensors |
30 Sep 2009 |
8 pages |
| Authors:
Len Thomas; Tiago Marques; David Borchers; Catriona Harris; David Moretti; Ronald Morrissey; Nancy DiMarzio; Jessica Ward; David Mellinger; Steve Martin; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| Determining the spatial density and distribution of cetacean (whale and dolphin) species is fundamental to understanding their basic biology, and also to monitoring and mitigating the effect of man-made impacts on their populations. However, this task is difficult because most cetacean species occur at low density and over enormous areas, and because they spend relatively little time at the surface where they can be seen using standard, visual surveys. Our ... |
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| Passive Acoustic Detection and Localization of Mesoplodon Densirostris (Blainville's Beaked Whale) Vocalization Using Distributed Bottom-Mounted Hydrophones in Conjunction With a Digital Tag (DTAG) Recording |
Oct 2008 |
10 pages |
| Authors:
Jessica Ward; Ronald Morrissey; David Moretti; Nancy DiMarzio; Susan Jarvis; Mark Johnson; Peter Tyack; Charles White; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| Click data from a tagged Mesoplodon densirostris was compared with broadband acoustic recordings from an 82 hydrophone wide-baseline array located in the Tongue of the Ocean, Bahamas. Two detectors, an Fast Fourier Transform (FFT) based detector and matched filter, were evaluated in white noise and with the acoustic recordings from the array for performance detecting M. densirostris clicks. The matched filter performed the best, allowing 92% of the tagged animal's ... |
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| DECAF - Density Estimation for Cetaceans from Passive Acoustic Fixed Sensors |
Jan-2008 |
9 pages |
| Authors:
Peter Tyack; David Mellinger; Jessica Ward; Nancy DiMarzio; Ronald Morrissey; David Moretti; David Borchers; Tiago Marques; Len Thomas; Steve Martin; Catriona Harris; SAINT ANDREWS UNIV (UNITED KINGDOM)
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| Determining the density and distribution of cetacean (whale and dolphin) species is fundamental to understanding their basic biology, and also to monitoring and mitigating the effect of man-made impacts on their populations. However, this task is difficult because most cetacean species occur at low density and over enormous areas, and because they spend relatively little time at the surface where they can be seen using standard, visual surveys. Our primary ... |
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| Passive Acoustic Measurement of Dive Vocal Behavior and Group Size of Blainville's Beaked Whale (Mesoplodon densirostris) in the Tongue of the Ocean (TOTO) |
Jan 2008 |
9 pages |
| Authors:
Nancy DiMarzio; David Moretti; Jessica Ward; Ronald Morrissey; Susan Jarvis; Anna M Izzi; Mark Johnson; Peter Tyack; Amanda Hansen; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| The vocal behavior of Blainville's beaked whale (Mesoplodon densirostris) was measured using the bottom-mounted hydrophones of the Atlantic Undersea Test and Evaluation Center (AUTEC) in the Bahamas. The statistics for the vocal durations and gaps within these vocal periods were measured over multiple deep foraging dives. The sizes of foraging groups of M. densirostris were estimated from the dive vocalization durations by applying click rate and detection ratio statistics derived ... |
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| DECAF - Density Estimation for Cetaceans from Passive Acoustic Fixed Sensors |
2007 |
8 pages |
| Authors:
Len Thomas; Tiago Marques; David Borchers; Catriona Stephenson; David Moretti; Ronald Morrissey; Nancy DiMarzio; Jessica Ward; David Mellinger; Steve Martin; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| Determining the density and distribution of cetacean species is fundamental to understanding their basic biology, and also to monitoring and mitigating the effect of man-made impacts on their populations. However, this task is difficult because most cetacean species occur at low density and over enormous areas, and because they spend relatively little time at the surface where they can be seen using standard, visual surveys. Our primary long-term goal is ... |
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| Automated Classification of Beaked Whales and Other Small Odontocetes in the Tongue of the Ocean, Bahamas |
01-Sep-2006 |
7 pages |
| Authors:
Ronald Morrissey; Nancy DiMarzio; Susan Jarvis; David Morretti; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| Navy sonar has recently been associated with a number of marine mammal stranding events. Beaked whales have been the predominant species involved in a number of these strandings. Monitoring and mitigating the effects of anthropogenic noise on marine mammals are active areas of research. Key to both monitoring and mitigation is the ability to automatically detect and classify the animals, especially beaked whales. This paper presents a novel support vector ... |
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