scholarly journals Acoustic detection range and population density of Cuvier's beaked whales estimated from near-surface hydrophones

2021 ◽  
Vol 149 (1) ◽  
pp. 111-125
Author(s):  
Jay Barlow ◽  
Selene Fregosi ◽  
Len Thomas ◽  
Danielle Harris ◽  
Emily T. Griffiths
Keyword(s):  
Population Density ◽  
Acoustic Detection ◽  
Detection Range ◽  
Near Surface ◽  
Beaked Whales

Acoustic detection of beaked whales from autonomous recording buoys

2008 ◽  
Vol 123 (5) ◽  
pp. 3207-3207 ◽  
Author(s):  
Antón Arias ◽  
Mark Johnson ◽  
Natacha Aguilar Soto ◽  
Peter T. Madsen ◽  
Peter Tyack ◽  
...  
Keyword(s):  
Acoustic Detection ◽  
Beaked Whales

scholarly journals Estimating cetacean population density using fixed passive acoustic sensors: An example with Blainville’s beaked whales

2009 ◽  
Vol 125 (4) ◽  
pp. 1982-1994 ◽  
Author(s):  
Tiago A. Marques ◽  
Len Thomas ◽  
Jessica Ward ◽  
Nancy DiMarzio ◽  
Peter L. Tyack
Keyword(s):  
Population Density ◽  
Acoustic Sensors ◽  
Beaked Whales ◽  
Passive Acoustic

Variation in dive behavior of Cuvier’s beaked whales with seafloor depth, time-of-day, and lunar illumination

2020 ◽  
Vol 644 ◽  
pp. 199-214 ◽  
Author(s):  
J Barlow ◽  
GS Schorr ◽  
EA Falcone ◽  
D Moretti
Keyword(s):  
Surface Waters ◽  
Predator Avoidance ◽  
Time Of Day ◽  
Maximum Depth ◽  
Near Surface ◽  
Beaked Whales ◽  
Energetic Constraints ◽  
The Mean ◽  
Ziphius Cavirostris ◽  
Foraging Time

Depth distributions were analyzed from a study of 19 Cuvier’s beaked whales Ziphius cavirostris that were tagged with satellite transmitting instruments off southern California, USA. Over 113000 depth measurements were made over the equivalent of ~200 sampling days. The mean foraging depth was 1182 m (SD = 305 m), and the mean of the maximum depth of all foraging dives was 1427 m (SD = 298 m). Mean foraging depths increased with seafloor depths up to a maximum of ~1300 m at a seafloor depth of 1900 m, but decreased slightly to a mean of ~1200 m at seafloor depths of 2000-4000 m. Near-bottom habitat appears to be important for foraging; whales spent ~30% of their foraging time within 200 m of the bottom at seafloor depths of 1000-2000 m. However, little foraging time was spent near the bottom at seafloor depths greater than 2000 m. The percentage of time spent at near-surface depths (<50 m) was more than twice as high at night (25%) than during the day (12%). Lunar light also appears to affect diving, with 28% of dark nights and only 17% of brightly moonlit nights spent at these near-surface depths. The apparent avoidance of surface waters during daytime and on brightly moonlit nights is consistent with avoidance of visual predators. A considerably greater fraction of time was spent foraging at night (24.8%) than during the day (15.7%), possibly due to energetic constraints imposed by predator avoidance during the day.

Detection of beaked whales using near surface towed hydrophones: prospects for survey and mitigation

2008 ◽  
Vol 123 (5) ◽  
pp. 3774-3774 ◽  
Author(s):  
Douglas Gillespie ◽  
Jonathan Gordon ◽  
Marjolaine Caillat ◽  
Diane Claridge ◽  
David Moretti ◽  
...  
Keyword(s):  
Near Surface ◽  
Beaked Whales

scholarly journals Temporal patterns in the acoustic signals of beaked whales at Cross Seamount

2008 ◽  
Vol 4 (2) ◽  
pp. 208-211 ◽  
Author(s):  
D.W Johnston ◽  
M McDonald ◽  
J Polovina ◽  
R Domokos ◽  
S Wiggins ◽  
...  
Keyword(s):  
Surface Waters ◽  
High Frequency ◽  
Marine Mammals ◽  
Prey Capture ◽  
Prey Availability ◽  
Beaked Whale ◽  
Near Surface ◽  
Beaked Whales ◽  
Fisheries Acoustics ◽  
Acoustic Recording

Seamounts may influence the distribution of marine mammals through a combination of increased ocean mixing, enhanced local productivity and greater prey availability. To study the effects of seamounts on the presence and acoustic behaviour of cetaceans, we deployed a high-frequency acoustic recording package on the summit of Cross Seamount during April through October 2005. The most frequently detected cetacean vocalizations were echolocation sounds similar to those produced by ziphiid and mesoplodont beaked whales together with buzz-type signals consistent with prey-capture attempts. Beaked whale signals occurred almost entirely at night throughout the six-month deployment. Measurements of prey presence with a Simrad EK-60 fisheries acoustics echo sounder indicate that Cross Seamount may enhance local productivity in near-surface waters. Concentrations of micronekton were aggregated over the seamount in near-surface waters at night, and dense concentrations of nekton were detected across the surface of the summit. Our results suggest that seamounts may provide enhanced foraging opportunities for beaked whales during the night through a combination of increased productivity, vertical migrations by micronekton and local retention of prey. Furthermore, the summit of the seamount may act as a barrier against which whales concentrate prey.

scholarly journals Passive acoustic detection of deep-diving beaked whales

2008 ◽  
Vol 124 (5) ◽  
pp. 2823-2832 ◽  
Author(s):  
Walter M. X. Zimmer ◽  
John Harwood ◽  
Peter L. Tyack ◽  
Mark P. Johnson ◽  
Peter T. Madsen
Keyword(s):  
Acoustic Detection ◽  
Deep Diving ◽  
Beaked Whales ◽  
Passive Acoustic

Shipboard echosounders negatively affect acoustic detection rates of beaked whales

2017 ◽  
Vol 141 (5) ◽  
pp. 3543-3543
Author(s):  
Danielle Cholewiak ◽  
Annamaria Izzi DeAngelis ◽  
Peter Corkeron ◽  
Sofie M. Van Parijs
Keyword(s):  
Acoustic Detection ◽  
Detection Rates ◽  
Beaked Whales
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