Matched-field processing and modal filtered range estimates of bowhead whale calls detected in the Alaskan Beaufort Sea

2011 ◽  
Vol 130 (4) ◽  
pp. 2357-2357
Author(s):  
Aaron M Thode
Keyword(s):  
Beaufort Sea ◽  
Bowhead Whale ◽  
Matched Field Processing

Effects of seismic exploration in the Beaufort Sea on bowhead whale call distributions.

2009 ◽  
Vol 126 (4) ◽  
pp. 2230
Author(s):  
Christopher S. Nations ◽  
Susanna B. Blackwell ◽  
Katherine H. Kim ◽  
Aaron M. Thode ◽  
Charles R. Greene ◽  
...  
Keyword(s):  
Beaufort Sea ◽  
Bowhead Whale ◽  
Seismic Exploration

Effects of seismic exploration activities on bowhead whale call distribution in the Alaskan Beaufort Sea.

2010 ◽  
Vol 127 (3) ◽  
pp. 1756-1756 ◽  
Author(s):  
Susanna B. Blackwell ◽  
Christopher S. Nations ◽  
Trent L. McDonald ◽  
Aaron Thode ◽  
Katherine H. Kim ◽  
...  
Keyword(s):  
Beaufort Sea ◽  
Bowhead Whale ◽  
Seismic Exploration

Holocene History of the Bering Sea Bowhead Whale (Balaena Mysticetus) in Its Beaufort Sea Summer Grounds off Southwestern Victoria Island, Western Canadian Arctic

2001 ◽  
Vol 55 (3) ◽  
pp. 371-379 ◽  
Author(s):  
Arthur S. Dyke ◽  
James M. Savelle
Keyword(s):  
Bering Sea ◽  
Late Holocene ◽  
Canadian Arctic ◽  
Beaufort Sea ◽  
Bowhead Whale ◽  
Bering Strait ◽  
Range Limit ◽  
Summer Range ◽  
Victoria Island ◽  
The Bering Sea

AbstractThe fossil remains of 43 bowhead whales were mapped on the raised beaches of western Wollaston Peninsula, Victoria Island, Canadian Arctic, near the historic summer range limit of the Bering Sea stock in the Beaufort Sea. The elevations and radiocarbon ages of the remains demonstrate that the bowhead ranged commonly into the region following the submergence of Bering Strait at ca. 10,000 14C yr B.P. until ca. 8500 14C yr B.P. During the same interval, bowheads ranged widely from the Beaufort Sea to Baffin Bay. Subsequently, no whales reached Wollaston Peninsula until ca. 1500 14C yr B.P. Late Holocene populations evidently were small, or occupations were brief, in comparison to those of the early Holocene. Although the late Holocene recurrence may relate to the expansion of pioneering Thule whalers eastward from Alaska, there are few Thule sites and limited evidence of Thule whaling in the area surveyed to support this suggestion.

Bowhead and Beluga Whale Distributions, Sighting Rates, and Habitat Associations in the Western Beaufort Sea in Summer and Fall 2009–16, with Comparison to 1982–91

ARCTIC ◽  
2018 ◽  
Vol 71 (2) ◽  
Author(s):  
Janet T. Clarke ◽  
Megan C. Ferguson ◽  
Amy L. Willoughby ◽  
Amelia A. Brower
Keyword(s):  
Habitat Use ◽  
Sea Ice ◽  
Continental Slope ◽  
Beaufort Sea ◽  
Habitat Associations ◽  
Bowhead Whale ◽  
Line Transect ◽  
Outer Continental Shelf ◽  
Beluga Whales ◽  
Shallow Habitat

We analyzed data from line-transect aerial surveys for marine mammals conducted in the western Beaufort Sea (shore to 72˚ N, 140˚–157˚ W) from July to October of 2009–16 to investigate the distribution, behaviors, sighting rates, and habitat use preferences of bowhead and beluga whales. The habitat use data allowed for direct comparison with data collected in the same area from 1982 to 1991. Both species are ice-adapted, migrating through leads in sea ice in spring, and are seasonal inhabitants of the western Beaufort Sea during summer and fall. From 2009 to 2016, bowheads were seen in all survey months, with the highest overall sighting rate (whales per km) in August. Bowhead sighting rates were highest in the whales’ preferred habitats: outer shelf habitat (51–200 m depth) in July and inner shelf-shallow habitat (≤ 20 m depth) in August, September, and October. Beluga whales were also seen in all survey months, with highest overall sighting rate in July. Beluga whales were overwhelmingly associated with continental slope habitat (201–2000 m depth) in all months. Bowhead distribution and depth preferences in summer months of 2009–16 differed from those observed in 1982–91, when bowheads were not seen during limited survey effort in July and preferred outer continental shelf habitat in August. These differences indicate that bowhead whale preference for shallow shelf habitat now occurs earlier in summer than it used to. Beluga distribution and depth preference remained similar between 1982–91 and 2009–16, with strong preference for continental slope during both periods. Differences in sea ice cover habitat association for both species are likely due more to the relative lack of sea ice in recent years compared to the earlier period than to shifts in habitat preference. Habitat partitioning between bowhead and beluga whales in the western Beaufort Sea remained evident except in July, when both species used continental slope habitat. In July – October 2009–16, the distribution, sighting rates, and behavior of both bowheads and belugas in the western Beaufort showed considerable interannual variation, which underscores the importance of annual sampling to accurate records of the complex western Beaufort Sea ecosystem.

Bowhead whale body condition and links to summer sea ice and upwelling in the Beaufort Sea

2015 ◽  
Vol 136 ◽  
pp. 250-262 ◽  
Author(s):  
John C. George ◽  
Matthew L. Druckenmiller ◽  
Kristin L. Laidre ◽  
Robert Suydam ◽  
Brian Person
Keyword(s):  
Sea Ice ◽  
Body Condition ◽  
Beaufort Sea ◽  
Bowhead Whale

Satellite-monitored movements of radio-tagged bowhead whales in the Beaufort and Chukchi seas during the late-summer feeding season and fall migration

2000 ◽  
Vol 78 (7) ◽  
pp. 1168-1181 ◽  
Author(s):  
Bruce R Mate ◽  
Gregory K Krutzikowsky ◽  
Martha H Winsor
Keyword(s):  
Shallow Water ◽  
Late Summer ◽  
Open Water ◽  
Beaufort Sea ◽  
River Delta ◽  
Bowhead Whale ◽  
Balaena Mysticetus ◽  
Bowhead Whales ◽  
Russian Waters ◽  
Summer Feeding

From 30 August to 6 September 1992, we tagged 12 juvenile bowhead whales (Balaena mysticetus) with Argos satellite-monitored radio tags in the Canadian Beaufort Sea off the Mackenzie River Delta. Eight tags documented [Formula: see text]9820 km of movements between 392 locations during 111 whale-tracking days. The whales did not move in unison. Individual movements and average speeds (1.1-5.8 km/h) varied widely. One whale stayed in Mackenzie Bay for 23.5 d, while the rest stayed an average of only 2.4 d. The majority of locations for all whales were in shallow water: 65% at <50 m depth and 87% at <100 m depth. Seven whales went into water >100 m deep and four were in water >500 m deep. The whale with the longest record traveled [Formula: see text]3886 km to Siberia in 32.5 d, averaging 5.0 km/h. Its westerly route through the Beaufort and Chukchi seas was between 70° and 72°N and primarily in heavy ice ([Formula: see text]90% coverage), which was continuous west of 151°W. This whale's speed was faster, though not significantly, in heavy ice than in more open water. This is the first detailed documentation of the route and speed of a bowhead whale during its fall migration from Canadian to Russian waters.

scholarly journals Use of Subsistence-Harvested Whale Carcasses by Polar Bears in the Southern Beaufort Sea

ARCTIC ◽  
2019 ◽  
Vol 72 (4) ◽  
pp. 404-412 ◽  
Author(s):  
Kate M. Lillie ◽  
Eric M. Gese ◽  
Todd C. Atwood ◽  
Mary M. Conner
Keyword(s):  
Polar Bear ◽  
Indigenous Communities ◽  
Beaufort Sea ◽  
Bowhead Whale ◽  
Annual Number ◽  
Polar Bears ◽  
Northern Coast ◽  
Open Population ◽  
Hair Samples ◽  
Northern Alaska

The availability of a food subsidy has the potential to influence the condition, behavior, fitness, and population dynamics of a species. Since the early 2000s, monitoring efforts along the coast of northern Alaska have indicated a higher proportion of polar bears (<i>Ursus maritimus</i>) of the southern Beaufort Sea (SB) subpopulation coming onshore to feed on subsistence-harvested bowhead whale (<i>Balaena mysticetus</i>) carcasses during the fall and early winter seasons. Concurrently, Indigenous communities annually hunt bowhead whale and deposit the unused remains at localized “bone piles,” creating the potential for human-bear interactions. Our objective was to determine the annual number of polar bears feeding at the bone pile near Kaktovik, Alaska. Using a hair snag surrounding the bone pile, we collected hair samples to identify individual bears via microsatellite genotypes during 2011 – 14. We used capture-mark-recapture data in the POPAN open-population model to estimate the number of bears visiting the bone pile. We estimated that as many as 72 (SE = 9) and 76 (SE = 10) male and female polar bears, respectively, used the bone pile located at Kaktovik, Alaska, in 2012, which represents approximately 16% of the SB polar bear subpopulation. It will be important to monitor the number of bears using the bone pile and subsequent human-bear interactions and conflicts along the northern coast of Alaska, if sea ice continues to recede.

scholarly journals Source level and calling depth distributions of migrating bowhead whale calls in the shallow Beaufort Sea

2016 ◽  
Vol 140 (6) ◽  
pp. 4288-4297 ◽  
Author(s):  
Aaron M. Thode ◽  
Susanna B. Blackwell ◽  
Kerri D. Seger ◽  
Alex S. Conrad ◽  
Katherine H. Kim ◽  
...  
Keyword(s):  
Beaufort Sea ◽  
Bowhead Whale ◽  
Source Level ◽  
Depth Distributions

Effects of airgun sounds on bowhead whale calling rates in the Alaskan Beaufort Sea

2013 ◽  
pp. n/a-n/a ◽  
Author(s):  
Susanna B. Blackwell ◽  
Christopher S. Nations ◽  
Trent L. McDonald ◽  
Charles R. Greene ◽  
Aaron M. Thode ◽  
...  
Keyword(s):  
Beaufort Sea ◽  
Bowhead Whale

Large-scale evaluation of automated detection and localization of bowhead whale calls in the Beaufort Sea.

2009 ◽  
Vol 126 (4) ◽  
pp. 2230
Author(s):  
Aaron M. Thode ◽  
Delphine Mathias ◽  
Christopher S. Nations ◽  
Trent L. McDonald ◽  
Michael Macrander
Keyword(s):  
Large Scale ◽  
Beaufort Sea ◽  
Automated Detection ◽  
Bowhead Whale ◽  
Scale Evaluation ◽  
Detection And Localization
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