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

Foraging behavior of fish‐eating sperm whales in the Gulf of Alaska in the presence and absence of fishing vessels

2005 ◽  
Vol 118 (3) ◽  
pp. 1909-1909 ◽  
Author(s):  
Aaron Thode ◽  
Jan Straley ◽  
Kendall Folkert ◽  
Victoria O’Connell ◽  
Christopher Tiemann
Keyword(s):  
Foraging Behavior ◽  
Gulf Of Alaska ◽  
Sperm Whales ◽  
Fishing Vessels ◽  
Presence And Absence

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

From clicks to counts: Applying line-transect methods to passive acoustic monitoring of sperm whales in the Gulf of Alaska

2014 ◽  
Vol 136 (4) ◽  
pp. 2246-2246
Author(s):  
Tina M. Yack ◽  
Thomas F. Norris ◽  
Elizabeth Ferguson ◽  
Brenda K. Rone ◽  
Alexandre N. Zerbini
Keyword(s):  
Gulf Of Alaska ◽  
Acoustic Monitoring ◽  
Line Transect ◽  
Sperm Whales ◽  
Passive Acoustic Monitoring ◽  
Passive Acoustic

scholarly journals Southeast Alaska Sperm Whale Avoidance Project (SEASWAP): a successful collaboration among scientists and industry to study depredation in Alaskan waters

2015 ◽  
Vol 72 (5) ◽  
pp. 1598-1609 ◽  
Author(s):  
Janice Straley ◽  
Victoria O'Connell ◽  
Joe Liddle ◽  
Aaron Thode ◽  
Lauren Wild ◽  
...  
Keyword(s):  
Sperm Whale ◽  
Gulf Of Alaska ◽  
Global Studies ◽  
Sperm Whales ◽  
Catch Per Unit Effort ◽  
Southeast Alaska ◽  
Vessel Area ◽  
Stock Assessments ◽  
Presence And Absence ◽  
Successful Collaboration

Abstract In Alaskan waters, depredation on sablefish longline gear by sperm whales increases harvesting cost, negatively biases stock assessments, and presents a risk of entanglement for whales. The Southeast Alaska Sperm Whale Avoidance Project (SEASWAP), a collaborative effort involving industry, scientists, and managers, since 2003 has undertaken research to evaluate depredation with a goal of recommending measures to reduce interactions. Prior to 2003, little was known about sperm whale distribution and behaviour in the Gulf of Alaska (GOA). Although fishers were reporting increasing interactions, the level of depredation varied with no apparent predictor of occurrence across vessels. Between 2003 and 2007, fishers were provided with fishery logbooks and recorded information on whale behaviour, whale presence and absence, during the set, soak, and haul for 319 sets in the GOA. Data were evaluated for a vessel, area, and seasonal (month) effect in the presence and absence of sperm whales. Using catch per unit effort (cpue) as a metric, in kg/100 hooks, results indicated that depredation depended on both the vessel and the area. More whales associated with vessels from April to August. Sperm whales were also likely to be present when cpue was high, revealing that whales and fishers both knew the most productive fishing areas, but confounding the use of cpue as a metric for depredation. Using a Bayesian mark-recapture analysis and the sightings histories of photo-identified whales, an estimated Nˆ=135 (95% CI 124, 153) sperm whales were associating with vessels in 2014. A spatial model was fitted to 319 longline sets and quantified a 3% loss in cpue, comparable to other global studies on sperm whale depredation. Through all phases of SEASWAP, our understanding of depredation has gained significantly. This successful collaboration should be considered as a model to create partnerships and build collaborations between researchers and fisherpeople encountering marine mammal interactions with fishing gear.

scholarly journals Depredating sperm whales in the Gulf of Alaska: local habitat use and long distance movements across putative population boundaries

2014 ◽  
Vol 24 (2) ◽  
pp. 125-135 ◽  
Author(s):  
JM Straley ◽  
GS Schorr ◽  
AM Thode ◽  
J Calambokidis ◽  
CR Lunsford ◽  
...  
Keyword(s):  
Habitat Use ◽  
Gulf Of Alaska ◽  
Sperm Whales ◽  
Long Distance ◽  
Local Habitat

scholarly journals Using Models of Social Transmission to Examine the Spread of Longline Depredation Behavior among Sperm Whales in the Gulf of Alaska

PLoS ONE ◽  
2014 ◽  
Vol 9 (10) ◽  
pp. e109079 ◽  
Author(s):  
Zachary A. Schakner ◽  
Chris Lunsford ◽  
Janice Straley ◽  
Tomoharu Eguchi ◽  
Sarah L. Mesnick
Keyword(s):  
Gulf Of Alaska ◽  
Social Transmission ◽  
Sperm Whales

Evidence for Foraging-Site Fidelity and Individual Foraging Behavior of Pelagic Cormorants Rearing Chicks in the Gulf of Alaska

The Condor ◽  
2011 ◽  
Vol 113 (1) ◽  
pp. 80-88 ◽  
Author(s):  
Jana Kotzerka ◽  
Scott A. Hatch ◽  
Stefan Garthe
Keyword(s):  
Foraging Behavior ◽  
Site Fidelity ◽  
Gulf Of Alaska ◽  
Foraging Site

Field trials of an acoustic decoy to attract sperm whales away from commercial longline fishing vessels in western Gulf of Alaska

2017 ◽  
Vol 196 ◽  
pp. 141-150 ◽  
Author(s):  
Lauren Wild ◽  
Aaron Thode ◽  
Janice Straley ◽  
Stephen Rhoads ◽  
Dan Falvey ◽  
...  
Keyword(s):  
Gulf Of Alaska ◽  
Field Trials ◽  
Sperm Whales ◽  
Fishing Vessels

Tracking and source level estimation of multiple sperm whales in the Gulf of Alaska using a two-element vertical array

2012 ◽  
Vol 132 (3) ◽  
pp. 1916-1916
Author(s):  
Delphine Mathias ◽  
Aaron M. Thode ◽  
Jan Straley ◽  
Russel D. Andrews
Keyword(s):  
Gulf Of Alaska ◽  
Sperm Whales ◽  
Vertical Array ◽  
Source Level
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