Passive acoustic survey of bowhead whales in the Chukchi Sea.

2009 ◽  
Vol 125 (4) ◽  
pp. 2549-2549
Author(s):  
Julien Delarue ◽  
Marjo Laurinolli ◽  
Bruce Martin
Keyword(s):  
Chukchi Sea ◽  
Acoustic Survey ◽  
Bowhead Whales ◽  
Passive Acoustic

Seasonal acoustic presence of fin and bowhead whales in relation to prey abundance and oceanographic environments in the southern Chukchi Sea

2016 ◽  
Vol 140 (4) ◽  
pp. 3361-3361
Author(s):  
Koki Tsujii ◽  
Mayuko Otsuki ◽  
Tomonari Akamatsu ◽  
Ikuo Matsuo ◽  
Kazuo Amakasu ◽  
...  
Keyword(s):  
Chukchi Sea ◽  
Prey Abundance ◽  
Bowhead Whales

scholarly journals THE DISTRIBUTION OF BOWHEAD WHALES, BALAENA MYSTICETUS, IN THE CHUKCHI SEA

1986 ◽  
Vol 2 (3) ◽  
pp. 214-222 ◽  
Author(s):  
R. V. Miller ◽  
D. J. Rugh ◽  
J. H. Ohnson
Keyword(s):  
Chukchi Sea ◽  
Balaena Mysticetus ◽  
Bowhead Whales

scholarly journals A comparison of three methods for estimating call densities of migrating bowhead whales using passive acoustic monitoring

2021 ◽  
Author(s):  
Cornelia S. Oedekoven ◽  
Tiago A. Marques ◽  
Danielle Harris ◽  
Len Thomas ◽  
Aaron M. Thode ◽  
...  
Keyword(s):  
Distance Sampling ◽  
Acoustic Monitoring ◽  
Bowhead Whale ◽  
Spatially Explicit ◽  
Passive Acoustic Monitoring ◽  
Bowhead Whales ◽  
Plot Sampling ◽  
Capture Recapture ◽  
Passive Acoustic

AbstractVarious methods for estimating animal density from visual data, including distance sampling (DS) and spatially explicit capture-recapture (SECR), have recently been adapted for estimating call density using passive acoustic monitoring (PAM) data, e.g., recordings of animal calls. Here we summarize three methods available for passive acoustic density estimation: plot sampling, DS, and SECR. The first two require distances from the sensors to calling animals (which are obtained by triangulating calls matched among sensors), but SECR only requires matching (not localizing) calls among sensors. We compare via simulation what biases can arise when assumptions underlying these methods are violated. We use insights gleaned from the simulation to compare the performance of the methods when applied to a case study: bowhead whale call data collected from arrays of directional acoustic sensors at five sites in the Beaufort Sea during the fall migration 2007–2014. Call detections were manually extracted from the recordings by human observers simultaneously scanning spectrograms of recordings from a given site. The large discrepancies between estimates derived using SECR and the other two methods were likely caused primarily by the manual detection procedure leading to non-independent detections among sensors, while errors in estimated distances between detected calls and sensors also contributed to the observed patterns. Our study is among the first to provide a direct comparison of the three methods applied to PAM data and highlights the importance that all assumptions of an analysis method need to be met for correct inference.

scholarly journals Confirmation of right whales near a nineteenth-century whaling ground east of southern Greenland

2011 ◽  
Vol 7 (3) ◽  
pp. 411-413 ◽  
Author(s):  
David K. Mellinger ◽  
Sharon L. Nieukirk ◽  
Karolin Klinck ◽  
Holger Klinck ◽  
Robert P. Dziak ◽  
...  
Keyword(s):  
Nineteenth Century ◽  
North Atlantic ◽  
Eubalaena Glacialis ◽  
Acoustic Survey ◽  
Temporal Separation ◽  
Right Whale ◽  
Right Whales ◽  
North Atlantic Right Whales ◽  
Passive Acoustic

North Atlantic right whales ( Eubalaena glacialis ) were found in an important nineteenth century whaling area east of southern Greenland, from which they were once thought to have been extirpated. In 2007–2008, a 1-year passive acoustic survey was conducted at five sites in and near the ‘Cape Farewell Ground’, the former whaling ground. Over 2000 right whale calls were recorded at these sites, primarily during July–November. Most calls were northwest of the historic ground, suggesting a broader range in this region than previously known. Geographical and temporal separation of calls confirms use of this area by multiple animals.

scholarly journals Underwater passive acoustic localization of Pacific walruses in the northeastern Chukchi Sea

2013 ◽  
Vol 134 (3) ◽  
pp. 2534-2545 ◽  
Author(s):  
Brendan P. Rideout ◽  
Stan E. Dosso ◽  
David E. Hannay
Keyword(s):  
Chukchi Sea ◽  
Acoustic Localization ◽  
Passive Acoustic

scholarly journals Bowhead and Gray Whale Distributions, Sighting Rates, and Habitat Associations in the Eastern Chukchi Sea, Summer and Fall 2009–15, with a Retrospective Comparison to 1982–91

ARCTIC ◽  
2016 ◽  
Vol 69 (4) ◽  
pp. 359 ◽  
Author(s):  
Janet T. Clarke ◽  
Amy S. Kennedy ◽  
Megan C. Ferguson
Keyword(s):  
Habitat Selection ◽  
Chukchi Sea ◽  
Habitat Associations ◽  
Bowhead Whale ◽  
Line Transect ◽  
Gray Whale ◽  
Depth Zone ◽  
Gray Whales ◽  
Bowhead Whales ◽  
Preferred Habitat

We analyzed data from line-transect aerial surveys for marine mammals conducted in the eastern Chukchi Sea (67˚–72˚ N, 157˚–169˚ W) in July to October of 2009–15 to investigate bowhead and gray whale distributions, behaviors, sighting rates, and habitat selection preferences, the last of which allowed direct comparison with results from data collected in this area in 1982–91. Bowhead whales use the eastern Chukchi Sea primarily for migrating between the Beaufort Sea and the Bering Sea, while gray whales use the area to feed on locally abundant benthic amphipods and other prey. Bowhead whales were observed during all survey months and were distributed up to 300 km offshore west and southwest of Point Barrow, Alaska, but without a defined migratory corridor in either summer (July-August) or fall (September-October). Bowhead whale sighting rates (whales per km on effort) were highest in the shelf/trough (51–200 m North) depth zone in the northeastern Chukchi Sea in both summer and fall. This pattern was reflected in habitat selection ratios, which found bowhead whales in summer and fall selecting primarily shelf/trough habitat in the northeastern Chukchi Sea, with shelf habitat (36 – 50 m) being preferred secondarily. Gray whales were observed in all survey months and were distributed primarily within ~95 km of shore between Point Barrow and Icy Cape in the northeastern Chukchi Sea, and about 60–115 km southwest of Point Hope in the southern Chukchi Sea. In both summer and fall, gray whale sighting rates and habitat selection ratios were highest in the shelf/trough (51–200 m South) depth zone in the southern Chukchi Sea. In the northeastern part of the study area, gray whale sighting rates and habitat selection ratios both identified coastal habitat (≤ 35 m) as preferred habitat in summer and shelf/trough (51–200 m North) as preferred habitat in fall. Distribution and habitat associations of bowhead and gray whales remained similar over the 34-year time span with one exception: gray whale preference for shelf/trough habitat in the southern Chukchi Sea is now evident throughout summer and fall, whereas three decades ago gray whale preference for that area was limited to fall only.

scholarly journals Fall and Winter Movements of Bowhead Whales (Balaena mysticetus) in the Chukchi Sea and Within a Potential Petroleum Development Area

ARCTIC ◽  
2010 ◽  
Vol 63 (3) ◽  
Author(s):  
Lori T. Quakenbush ◽  
John J. Citta ◽  
John C. George ◽  
Robert J. Small ◽  
Mads Peter Heide-Jørgensen
Keyword(s):  
Chukchi Sea ◽  
Balaena Mysticetus ◽  
Bowhead Whales ◽  
Development Area ◽  
Petroleum Development
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