Model‐based passive acoustic tracking of sperm whale foraging behavior in the Gulf of Alaska

2005 ◽  
Vol 118 (3) ◽  
pp. 1909-1909 ◽  
Author(s):  
Christopher Tiemann ◽  
Aaron Thode ◽  
Jan Straley ◽  
Kendall Folkert ◽  
Victoria O’Connell
Keyword(s):  
Foraging Behavior ◽  
Sperm Whale ◽  
Gulf Of Alaska ◽  
Acoustic Tracking ◽  
Model Based ◽  
Passive Acoustic

Three‐dimensional passive acoustic tracking of sperm whale behavior with widely separated vertical arrays in the Gulf of Alaska

2006 ◽  
Vol 120 (5) ◽  
pp. 3014-3014
Author(s):  
Christopher O. Tiemann ◽  
Aaron M. Thode ◽  
Jan Straley ◽  
Kendall Folkert ◽  
Victoria O’Connell
Keyword(s):  
Three Dimensional ◽  
Sperm Whale ◽  
Gulf Of Alaska ◽  
Acoustic Tracking ◽  
Vertical Arrays ◽  
Passive Acoustic

scholarly journals Acoustic tracking of sperm whales in the Gulf of Alaska using a two-element vertical array and tags

2013 ◽  
Vol 134 (3) ◽  
pp. 2446-2461 ◽  
Author(s):  
Delphine Mathias ◽  
Aaron M. Thode ◽  
Jan Straley ◽  
Russel D. Andrews
Keyword(s):  
Gulf Of Alaska ◽  
Sperm Whales ◽  
Vertical Array ◽  
Acoustic Tracking

scholarly journals Foraging dives of sperm whales in the north-western Mediterranean Sea

2012 ◽  
Vol 92 (8) ◽  
pp. 1799-1808 ◽  
Author(s):  
Alexandre Gannier ◽  
Estelle Petiau ◽  
Violaine Dulau ◽  
Luke Rendell
Keyword(s):  
Prey Capture ◽  
Sperm Whale ◽  
Western Mediterranean ◽  
Sperm Whales ◽  
The North ◽  
Western Mediterranean Sea ◽  
Single Animal ◽  
Components Analysis ◽  
Passive Acoustic ◽  
North Western

Oceanic odontocetes rely on echolocation to forage on pelagic or benthic prey, but their feeding ecology is difficult to study. We studied sperm whale foraging dives during summer in the north-western Mediterranean, using visual and passive acoustic observations. Clicking and creaking activities were recorded during dives of focal whales, at distances <3000 m using a towed hydrophone and DAT recorder. A total of 52 sperm whales were recorded over at least one full dive cycle. Data were obtained for 156 complete dives in total, including sequences of up to nine consecutive dives. Various dive and environmental variables were entered in multiple linear regression and principal components analysis, as well as estimated mass of whales. Creak rate was 0.80 creak/minute on average, with moderate variance. Bigger whales tended to dive longer at greater depths (as suggested by ascent durations), and emitted more creaks during a dive: 20.2 creaks/dive on average for individuals <24 tons, compared to 25.6 creaks/dive for animals >24 tons of estimated mass. For individual whales, creak rates did not vary significantly with size (range 0.78–0.80 creak/minute), but decreased with time of the day, and increased for shorter foraging phases. For different dives, higher creak rates were also observed earlier in the day, and linked to shorter foraging phases and surface durations. Although the exact significance of creak emissions (i.e. foraging attempt or prey capture) is not precisely determined, creak rates may be reliably used to quantify sperm whale foraging when single animal dives can be followed acoustically.

scholarly journals Testing a passive deterrent on longlines to reduce sperm whale depredation in the Gulf of Alaska

2015 ◽  
Vol 72 (5) ◽  
pp. 1667-1672 ◽  
Author(s):  
Victoria O'Connell ◽  
Janice Straley ◽  
Joe Liddle ◽  
Lauren Wild ◽  
Linda Behnken ◽  
...  
Keyword(s):  
Sperm Whale ◽  
Gulf Of Alaska ◽  
Primary Objective ◽  
Collaborative Effort ◽  
Physeter Macrocephalus ◽  
Anoplopoma Fimbria ◽  
Acoustic Data ◽  
The Individual ◽  
And Control ◽  
Individual Fishing Quota

Abstract In Alaska, sperm whale (Physeter macrocephalus) depredation on longline sets has increased since implementation of the Individual Fishing Quota programme in 1995. A collaborative effort (SEASWAP) between longliners, scientists, and managers has undertaken research to evaluate this depredation with a primary objective to develop and test a passive deterrent that would reduce depredation without reducing catch rate of sablefish (Anoplopoma fimbria). Commercial longliners, fishing for their own sablefish quotas during the regular season, deployed beaded gear (25 mm lucite beads attached to gangions) with control gear and set recorders to collect acoustic data. Beaded and control gear were randomly assigned by skate quad (672 hooks) with 5 quads in each longline set. Acoustic recorders were used to document sperm whale creak–pause events, representative of depredation of the longline gear. Although there were more sablefish per skate quad on the beaded gear and there was a decrease in depredation events on the beaded gear compared with the control, neither effect was significant (p = 0.205 and 0.364, respectively). The SEASWAP project is testing other deterrent strategies including gear modifications and the establishment of a sighting network to improve avoidance.

Passive acoustic tracking of echolocating harbor porpoise (Phocoena phocoena). I. Fisheries management requirements and biological basis

1997 ◽  
Vol 102 (5) ◽  
pp. 3212-3212
Author(s):  
David C. Potter ◽  
Janeen M. Quintal ◽  
James H. Miller ◽  
Robert Gampert ◽  
Khosrow Lashkari
Keyword(s):  
Fisheries Management ◽  
Phocoena Phocoena ◽  
Harbor Porpoise ◽  
Acoustic Tracking ◽  
Biological Basis ◽  
Passive Acoustic

Acoustic and foraging behavior of tagged sperm whales under natural and depredation foraging conditions in the Gulf of Alaska

2013 ◽  
Vol 134 (5) ◽  
pp. 4008-4008
Author(s):  
Delphine Mathias ◽  
Lauren Wild ◽  
Aaron Thode ◽  
Jan Straley ◽  
John Calambokidis ◽  
...  
Keyword(s):  
Foraging Behavior ◽  
Gulf Of Alaska ◽  
Sperm Whales
Sign in / Sign up

Export Citation Format

Share Document