scholarly journals Comparing observations and parameterizations of ice-ocean drag through an annual cycle across the Beaufort Sea

2020 ◽  
Author(s):  
Samuel Dale Brenner ◽  
Luc Rainville ◽  
Jim Thomson ◽  
Sylvia T. Cole ◽  
Craig M. Lee
Keyword(s):  
Annual Cycle ◽  
Beaufort Sea

scholarly journals Year-Round Dive Characteristics of Male Beluga Whales From the Eastern Beaufort Sea Population Indicate Seasonal Shifts in Foraging Strategies

2022 ◽  
Vol 8 ◽  
Author(s):  
Luke Storrie ◽  
Nigel E. Hussey ◽  
Shannon A. MacPhee ◽  
Greg O’Corry-Crowe ◽  
John Iacozza ◽  
...  
Keyword(s):  
Annual Cycle ◽  
Environmental Variables ◽  
Marine Mammals ◽  
Beaufort Sea ◽  
Optimal Foraging Theory ◽  
Sampling Interval ◽  
Foraging Strategies ◽  
Vertical Movements ◽  
Beluga Whales ◽  
Seasonal Shifts

Dive behavior represents multiple ecological functions for marine mammals, but our understanding of dive characteristics is typically limited by the resolution or longevity of tagging studies. Knowledge on the time-depth structures of dives can provide insight into the behaviors represented by vertical movements; furthering our understanding of the ecological importance of habitats occupied, seasonal shifts in activity, and the energetic consequences of targeting prey at a given depth. Given our incomplete understanding of Eastern Beaufort Sea (EBS) beluga whale behavior over an annual cycle, we aimed to characterize dives made by belugas, with a focus on analyzing shifts in foraging strategies. Objectives were to (i) characterize and classify the range of beluga-specific dive types over an annual cycle, (ii) propose dive functions based on optimal foraging theory, physiology, and association with environmental variables, and (iii) identify whether belugas undergo seasonal shifts in the frequency of dives associated with variable foraging strategies. Satellite-linked time-depth-recorders (TDRs) were attached to 13 male belugas from the EBS population in 2018 and 2019, and depth data were collected in time series at a 75 s sampling interval. Tags collected data for between 13 and 357 days, including three tags which collected data across all months. A total of 90,211 dives were identified and characterized by twelve time and depth metrics and classified into eight dive types using a Gaussian mixed modeling and hierarchical clustering analysis approach. Dive structures identify various seasonal behaviors and indicate year-round foraging. Shallower and more frequent diving during winter in the Bering Sea indicate foraging may be energetically cheaper, but less rewarding than deeper diving during summer in the Beaufort Sea and Arctic Archipelago, which frequently exceeded the aerobic dive limit previously calculated for this population. Structure, frequency and association with environmental variables supports the use of other dives in recovery, transiting, and navigating through sea ice. The current study provides the first comprehensive description of the year-round dive structures of any beluga population, providing baseline information to allow improved characterization and to monitor how this population may respond to environmental change and increasing anthropogenic stressors.

scholarly journals Comparing observations and parameterizations of ice‐ocean drag through an annual cycle across the Beaufort Sea

2021 ◽  
Author(s):  
Samuel Brenner ◽  
Luc Rainville ◽  
Jim Thomson ◽  
Sylvia Cole ◽  
Craig Lee
Keyword(s):  
Annual Cycle ◽  
Beaufort Sea

Variability in the annual cycle of vertical particulate organic carbon export on Arctic shelves: Contrasting the Laptev Sea, Northern Baffin Bay and the Beaufort Sea

2009 ◽  
Vol 29 (17) ◽  
pp. 2157-2165 ◽  
Author(s):  
Catherine Lalande ◽  
Alexandre Forest ◽  
David G. Barber ◽  
Yves Gratton ◽  
Louis Fortier
Keyword(s):  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
Annual Cycle ◽  
Beaufort Sea ◽  
Laptev Sea ◽  
Carbon Export ◽  
Baffin Bay ◽  
The Laptev Sea

Vertical segregation of age-0 and age-1+ polar cod (Boreogadus saida) over the annual cycle in the Canadian Beaufort Sea

Polar Biology ◽  
2015 ◽  
Vol 39 (6) ◽  
pp. 1023-1037 ◽  
Author(s):  
Maxime Geoffroy ◽  
Andrew Majewski ◽  
Mathieu LeBlanc ◽  
Stéphane Gauthier ◽  
Wojciech Walkusz ◽  
...  
Keyword(s):  
Annual Cycle ◽  
Beaufort Sea ◽  
Polar Cod ◽  
Boreogadus Saida ◽  
Polar Cod Boreogadus Saida ◽  
Vertical Segregation

Annual cycle of courtship behavior in the male turkey.

1968 ◽  
Vol 66 (3, Pt.1) ◽  
pp. 743-746 ◽  
Author(s):  
Wolfgang M. Schleidt
Keyword(s):  
Annual Cycle ◽  
Courtship Behavior
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