Match!
Stephen R. Okkonen
University of Alaska Fairbanks
36Publications
15H-index
692Citations
Publications 36
Newest
#1Stephen R. Okkonen (UAF: University of Alaska Fairbanks)H-Index: 15
#2Carin J. Ashjian (WHOI: Woods Hole Oceanographic Institution)H-Index: 28
Last.Philip Alatalo (WHOI: Woods Hole Oceanographic Institution)H-Index: 7
view all 4 authors...
Abstract Barrow Canyon, which incises the northeast corner of the Chukchi Sea shelf, is a major conduit through which Pacific-origin waters carrying nutrients, biota, freshwater, and heat enter the Arctic Ocean. As such, Barrow Canyon was adopted as a long-term monitoring site for the Distributed Biological Observatory (DBO) in 2010. However, annual hydrographic surveys across Barrow Canyon, conducted during late August 2005–2015 along a location near what is the Barrow Canyon DBO survey line an...
#1John J. Citta (Alaska Department of Fish and Game)H-Index: 10
#2Stephen R. Okkonen (UAF: University of Alaska Fairbanks)H-Index: 15
Last.Lois A. HarwoodH-Index: 13
view all 10 authors...
Abstract Each fall, bowhead whales in the Bering-Chukchi-Beaufort (BCB) population migrate westward from summering grounds in the Beaufort Sea through the Chukchi Sea to the northern coast of Chukotka, Russia. Routes whales use when crossing the Chukchi Sea vary by year; in some years, whales migrate directly to the northern coast of Chukotka while in other years, whales may pause migration and linger, presumably to feed, in the central Chukchi Sea. To investigate how whale movements may be rela...
#1Carin J. AshjianH-Index: 28
#2Robert G. CampbellH-Index: 25
Last.Stephen R. OkkonenH-Index: 15
view all 3 authors...
#1Kathleen M. Stafford (UW: University of Washington)H-Index: 26
#2John J. Citta (Alaska Department of Fish and Game)H-Index: 10
Last.Robert SuydamH-Index: 19
view all 4 authors...
Abstract Beluga whales ( Delphinapterus leucas ) are the most abundant cetacean in the Arctic. The Barrow Canyon region, Alaska, is a hotspot for Pacific Arctic belugas, likely because the oceanographic environment provides reliable foraging opportunities. Fronts are known to promote the concentration of planktonic prey; when Barrow-area winds are weak or from the west, a front associated with the Alaskan Coastal Current (ACC) intensifies. This front is weakened or disrupted when strong easterly...
#1Kathleen M. Stafford (UW: University of Washington)H-Index: 26
#2Megan C. FergusonH-Index: 12
Last.Robert S. SuydamH-Index: 9
view all 10 authors...
Abstract The seasonal and geographic patterns in the distribution, residency, and density of two populations (Chukchi and Beaufort) of beluga whales ( Delphinapterus leucas ) were examined using data from aerial surveys, passive acoustic recordings, and satellite telemetry to better understand this arctic species in the oceanographically complex and changing western Beaufort Sea. An aerial survey data-based model of beluga density highlights the Beaufort Sea slope as important habitat for beluga...
#1Stephen R. Okkonen (UAF: University of Alaska Fairbanks)H-Index: 15
#2Janet T. Clarke (Leidos)H-Index: 9
Last.Rachel A. Potter (UAF: University of Alaska Fairbanks)H-Index: 5
view all 3 authors...
Abstract Aerial surveys for bowhead whales have been conducted with a relatively consistent methodology over the Alaskan Beaufort Sea since 1989. Sightings of bowhead whales in the central Alaskan Beaufort Sea in September 1997 and September 2014 were unusual in that hundreds of whales were observed within a few kilometers of local barrier islands. We compare bowhead whale sightings, river discharge data, wind records, and satellite imagery to argue that the large numbers of bowhead whales obser...
#1Sue E. Moore (Office of Science and Technology)H-Index: 38
#2Phyllis J. Stabeno (PMEL: Pacific Marine Environmental Laboratory)H-Index: 45
Last.Stephen R. Okkonen (UAF: University of Alaska Fairbanks)H-Index: 15
view all 4 authors...
Abstract The Pacific Arctic marine ecosystem extends from the northern Bering Sea, across the Chukchi and into the East Siberian and Beaufort seas. Food webs in this ecosystem are short, a simplicity that belies the biophysical complexity underlying trophic linkages from primary production to humans. Existing advective and pelagic-benthic coupling models describe processes that connect certain aspects of marine food webs, but do not offer a comprehensive approach to understanding the Pacific Arc...
#1Jacqueline M. Grebmeier (UMCES: University of Maryland Center for Environmental Science)H-Index: 39
#2Bodil A. Bluhm (University of Tromsø)H-Index: 26
Last.Stephen R. Okkonen (UAF: University of Alaska Fairbanks)H-Index: 15
view all 17 authors...
Abstract The northern Bering and Chukchi Seas are areas in the Pacific Arctic characterized by high northward advection of Pacific Ocean water, with seasonal variability in sea ice cover, water mass characteristics, and benthic processes. In this review, we evaluate the biological and environmental factors that support communities of benthic prey on the continental shelves, with a focus on four macrofaunal biomass “hotspots.” For the purpose of this study, we define hotspots as macrofaunal benth...
#1John J. Citta (Alaska Department of Fish and Game)H-Index: 10
#2Lori T. Quakenbush (Alaska Department of Fish and Game)H-Index: 17
view all 12 authors...
The Bering–Chukchi–Beaufort (BCB) population of bowhead whales (Balaena mysticetus) ranges across the seasonally ice-covered waters of the Bering, Chukchi, and Beaufort seas. We used locations from 54 bowhead whales, obtained by satellite telemetry between 2006 and 2012, to define areas of concentrated use, termed “core-use areas”. We identified six primary core-use areas and describe the timing of use and physical characteristics (oceanography, sea ice, and winds) associated with these areas. I...
1234