Oceanography > Issues > Archive > Volume 26, Number 4

2013, Oceanography 26(4):136–149, http://dx.doi.org/10.5670/oceanog.2013.81

Subarctic Cetaceans in the Southern Chukchi Sea: Evidence of Recovery or Response to a Changing Ecosystem

Authors | Abstract | Full Article | Citation | References


Janet Clarke | Leidos, Buckley, WA, USA

Kathleen Stafford | Applied Physics Laboratory, University of Washington, Seattle, WA, USA

Sue E. Moore | National Oceanic and Atmospheric Administration (NOAA), Fisheries Office of Science & Technology, Seattle, WA, USA

Brenda Rone | National Marine Mammal Laboratory, NOAA/National Marine Fisheries Service (NMFS), Seattle, WA, USA

Lisanne Aerts | LAMA Ecological, Anchorage, AK, US

Jessica Crance | National Marine Mammal Laboratory, NOAA/NMFS, Seattle, WA, USA



The southern Chukchi Sea is one of the most productive areas in the world ocean. Over the past decade, there have been dramatic changes in this region in sea ice cover and in Bering Strait inflow, and it is now in the path of transpolar shipping and destinational ship traffic, including vessels supporting Arctic offshore oil and gas development and tourism, all of which are anticipated to increase with decreasing seasonal sea ice cover. Little research on cetaceans has been conducted in the southern Chukchi Sea, and most information on the occurrence of subarctic species (humpback whale Megaptera novaeangliae, fin whale Balaenoptera physalus, minke whale B. acutorostrata, and killer whale Orcinus orca) comes from the ships' logs of commercial whalers in the mid to late twentieth century and from observers stationed along the Chukotka Peninsula. Information on cetacean seasonal occurrence east of the International Date Line (IDL) in US waters is particularly scarce. To address this information gap, we compiled visual sightings and acoustic detections of subarctic cetaceans in the southern Chukchi Sea during summer and early autumn from 2009 to 2012. Humpback whales were common on both sides of the IDL in August and September. Fin and minke whales were widely distributed east of the IDL from July to September, and killer whales were seen sporadically but were the most widely dispersed of the four species. Comparisons of our results with historical records indicate that the incidence of subarctic cetaceans may be increasing in the southern Chukchi Sea. An increase in occurrence may simply be a post-commercial whaling recovery of whale numbers and seasonal range by each species, or it may reflect responses to ongoing climate change. Understanding current stock identity, spatial and temporal distribution, habitat preference, relative abundance, and potential impacts of climate change on these species will require cetacean-focused research in this region of the Arctic.


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Clarke, J., K. Stafford, S.E. Moore, B. Rone, L. Aerts, and J. Crance. 2013. Subarctic cetaceans in the southern Chukchi Sea: Evidence of recovery or response to a changing ecosystem. Oceanography 26(4):136–149, http://dx.doi.org/10.5670/oceanog.2013.81.



Aagaard, K., A.T. Roach, and J.D. Schmacher. 1985. On the wind-driven variability of the flow through Bering Strait. Journal of Geophysical Research 90:7,213–7,221, http://dx.doi.org/10.1029/JC090iC04p07213.
Aerts, L.A.M., W. Hetrick, S. Sitkiewicz, C. Schudel, D. Snyder, and R. Gumtow. 2013a. Marine Mammal Distribution and Abundance in the Northeastern Chukchi Sea During Summer and Early Fall, 2008–2012. Report prepared by LAMA Ecological for ConocoPhillips Alaska, Inc., Shell Exploration and Production Company and Statoil USA E&P, Inc., 69 pp.
Aerts, L.A.M., A.E. McFarland, B.H. Watts, K.S. Lomac-MacNair, P.E. Seiser, S.S. Wisdom, A.V. Kirk, and C.A. Schudel. 2013b. Marine mammal distribution and abundance in an offshore sub-region of the northeastern Chukchi Sea during the open-water season. Continental Shelf Research 67:116–126, http://dx.doi.org/10.1016/j.csr.2013.04.020.
Aguilar, A. 2002. Fin whale. Pp. 435–438 in Encyclopedia of Marine Mammals. W.F. Perrin, B. Wursig, and J.G.M. Thewissen, eds, Academic Press, San Diego, CA.
Allen, B.M., and R.P. Angliss. 2012. Alaska Marine Mammal Stock Assessments, 2011. US Department of Commerce, NOAA Technical Memorandum NMFS-AFSC-234. Available online at: http://www.nmfs.noaa.gov/pr/pdfs/sars/ak2011.pdf (accessed December 9, 2013).
Barlow, J., J. Calambokidis, E.A. Falcone, C.S. Baker, A.M. Burdin, P.J. Clapham, J.K.B. Ford, C.M. Gabriele, R. LeDuc, D.K. Mattila, and others. 2011. Humpback whale abundance in the North Pacific estimated by photographic capture-recapture with bias correction from simulation studies. Marine Mammal Science 27:793–818, http://dx.doi.org/10.1111/j.1748-7692.2010.00444.x.
Berchok, C.L., P.J. Clapham, J. Crance, S.E. Moore, J. Napp, J. Overland, and P. Stabeno. 2011. Passive Acoustic Detection and Monitoring of Endangered Whales in the Arctic (Beaufort, Chukchi) & Ecosystem Observations in the Chukchi Sea: Biophysical Moorings and Climate Modeling. Annual Report prepared under contract M09PC00016 (AKC 083) to the Bureau of Ocean Energy Management, Regulation, and Enforcement, Anchorage, AK, 13 pp. Available online at: http://www.afsc.noaa.gov/nmml/PDF/CHAOZ-2010-Report.pdf (accessed December 9, 2013).
Berchok, C.L., P.J. Clapham, J. Crance, S.E. Moore, J. Napp, J. Overland, and P. Stabeno. 2012. Passive Acoustic Detection and Monitoring of Endangered Whales in the Arctic (Beaufort, Chukchi) & Ecosystem Observations in the Chukchi Sea: Biophysical Moorings and Climate Modeling. Annual Report prepared under contract M09PC00016 (AKC 083) to the Bureau of Ocean Energy Management, Anchorage, AK, 15 pp. Available online at: http://www.afsc.noaa.gov/nmml/PDF/CHAOZ-2011-Report.pdf (accessed December 9, 2013).
Berline, L., Y.H. Spitz, C.J. Ashjian, R.G. Campbell, W. Maslowski, and S.E. Moore. 2008. Euphausiid transport in the western Arctic Ocean. Marine Ecology Progress Series 360:163–178, http://dx.doi.org/10.3354/meps07387.
Bluhm, B., K.O. Coyle, B. Konar, and R. Highsmith. 2007. High gray whale relative abundances associated with an oceanographic front in the south-central Chukchi Sea. Deep Sea Research Part II 54:2,919–2,933, http://dx.doi.org/10.1016/j.dsr2.2007.08.015.
Bluhm, B.A., K. Iken, S.M. Hardy, B.I. Sirenko, and B.A. Holladay. 2009. Community structure of epibenthic megafauna in the Chukchi Sea. Aquatic Biology 7:269–293, http://dx.doi.org/10.3354/ab00198.
Borodin, R.G., V.M. Etylin, O.V. Etylina, D. Litovka, V.V. Mel’nikov, L.L. Solovenchuk, N.G. Shevchenko, E.V. Zdor, S.A. Blokhin, G.M. Zelensky, and L.I. Ainana. 2002. Cultural, traditional, and nutritional needs of the aboriginal population of Chukotka for gray whales and bowhead whales 2003–1007. Paper SC/54/AS5 presented to the International Whaling Commission Scientific Committee.
Carretta, J.V., K.A. Forney, E. Oleson, K. Martien, M.M. Muto, M.S. Lowry, J. Barlow, J. Baker, B. Hanson, D. Lynch, and others. 2011. US Pacific Marine Mammal Stock Assessments: 2010. US Department of Commerce, NOAA Technical Memorandum, NMFS-SWFSC-476, 356 pp. Available online at: http://www.nmfs.noaa.gov/pr/pdfs/sars/po2010.pdf (accessed December 9, 2013).
Castellote, M., C.W. Clark, and M.O. Lammers. 2012. Fin whale (Balaenoptera physalus) population identity in the western Mediterranean Sea. Marine Mammal Science 28:325–344, http://dx.doi.org/10.1111/j.1748-7692.2011.00491.x.
Citta, J.J., L.T. Quakenbush, J.C. George, R.J. Small, M.P. Heide-Jørgensen, H. Brower, B. Adams, and L. Brower. 2012. Winter movements of bowhead whales (Balaena mysticetus) in the Bering Sea. Arctic 65(1):13–34.
Clapham, P. 2002. Humpback whale. Pp. 589–592 in Encyclopedia of Marine Mammals. W.F. Perrin, B. Wursig, and J.G.M. Thewissen, eds, Academic Press, San Diego, CA.
Clarke, J.T., M.C. Ferguson, C.L Christman, S.L. Grassia, A.A. Brower, and L.J. Morse. 2011. Chukchi Offshore Monitoring in Drilling Area (COMIDA) Distribution and Relative Abundance of Marine Mammals: Aerial Surveys. Report prepared by the National Marine Mammal Laboratory (NMFS) for the BOEMRE, OCS Study BOEMRE 2011-06, 286 pp.
Clarke, J.T., C.L. Christman, A.A. Brower, and M.C. Ferguson. 2012. Distribution and Relative Abundance of Marine Mammals in the Alaskan Chukchi and Beaufort Seas, 2011. Annual Report, OCS Study BOEM 2012-009. National Marine Mammal Laboratory, Alaska Fisheries Science Center, NMFS, NOAA, Seattle, WA, 344 pp. Available online at: http://www.afsc.noaa.gov/nmml/PDF/COMIDA-2011-Report.pdf (accessed December 9, 2013).
Clarke, J.T., C.L. Christman, A.A. Brower, and M.C. Ferguson. 2013. Distribution and Relative Abundance of Marine Mammals in the northeastern Chukchi and western Beaufort Seas, 2012. Annual Report, OCS Study BOEM 2013-00117. National Marine Mammal Laboratory, Alaska Fisheries Science Center, NMFS, NOAA, Seattle, WA, 349 pp.
Clarke, J.T., S.E. Moore, and M.M. Johnson. 1993. Observations on beluga fall migration in the Alaskan Beaufort Sea, 1982–87, and northeastern Chukchi Sea, 1982–91. Report of the International Whaling Commission 43:387–396.
Delarue, J., S.K. Todd, S.M. VanParijs, and L. Di Iorio. 2009. Geographic variation in Northwest Atlantic fin whale (Balaenoptera physalus) song: Implications for stock structure assessment. Journal of the Acoustical Society of America 125:1,774–1,782, http://dx.doi.org/10.1121/1.3068454.
Delarue, J., B. Martin, and D. Hannay. 2012. Minke whale boing sound detections in the northeastern Chukchi Sea. Marine Mammal Science 29:E333–E341, http://dx.doi.org/10.1111/j.1748-7692.2012.00611.x.
Delarue, J., B. Martin, D. Hannay, and C. Berchok. 2013. Acoustic occurrence and affiliation of fin whales detected in the northeastern Chukchi Sea, July to October 2007–2010. Arctic 66(2):159–172.
Eisner, L., N. Hillgruber, E. Martinson, and J. Maselko. 2013. Pelagic fish and zooplankton species assemblages in relation to water mass characteristics in the northern Bering and southeast Chukchi Seas. Polar Biology 36:87–113, http://dx.doi.org/10.1007/s00300-012-1241-0.
Feder, H.M., A.S. Naidu, S.C. Jewett, J.M Hameedi, W.R. Johnson, and T.E. Whitledge. 1994. The northeastern Chukchi Sea: Benthos-environmental interactions. Marine Ecology Progress Series 111:171–190, http://dx.doi.org/10.3354/meps111171.
Ford, J.K.B. 2002. Killer whale. Pp. 669–676 in Encyclopedia of Marine Mammals. W.F. Perrin, B. Wursig, and J.G.M. Thewissen, eds, Academic Press, San Diego, CA.
Friday, N.A., J.M. Waite, A.N. Zerbini, and S.E. Moore. 2012. Cetacean distribution and abundance in relation to oceanographic domains on the eastern Bering Sea Shelf: 1999–2004. Deep-Sea Research Part II 65–70:260–272, http://dx.doi.org/10.1016/j.dsr2.2012.02.006.
Friday, N., P. Clapham, C. Berchok, J. Crance, A. Zerbini, B. Rone, A. Kennedy, P. Stabeno, and J. Napp. 2013. ARCWEST (Arctic Whale Ecology Study) 2013 Cruise Report. Report to the Bureau of Ocean Energy Management (BOEM).
George, J.C., L.M. Philo, K. Hazard, D. Withrow, G.M. Carroll, and R. Suydam. 1994. Frequency of killer whale (Orcinus orca) attacks and ship collisions based on scarring on bowhead whales (Balaena mysticetus) of the Bering-Chukchi-Beaufort seas stock. Arctic 47(3):246–255.
Grebmeier, J.M. 2012. Shifting patterns of life in the Pacific Arctic and Sub-Arctic Seas. Annual Review of Marine Science 4:63–78, http://dx.doi.org/10.1146/annurev-marine-120710-100926.
Haley, B., J. Beland, D.S. Ireland, R. Rodrigues, and D.M. Savarese. 2010. Chukchi Sea vessel-based monitoring program. Chapter 3 in Joint Monitoring Program in the Chukchi and Beaufort Seas, Open Water Seasons, 2006–2008. D.W. Funk, D.S. Ireland, R. Rodrigues, and W.R. Koski, eds, LGL Alaska Report P1050-2, Report from LGL Alaska Research Associates, Inc., LGL Ltd., Greeneridge Sciences, Inc., and JASCO Research, Ltd., for Shell Offshore, Inc., and Other Industry Contributors, and National Marine Fisheries Service, US Fish and Wildlife Service, 506 pp. plus appendices.
Hannay, D.E., J. Delarue, X. Mouy, B.S. Martin, D. Leary, J.N. Oswald, and J. Vallarta. 2013. Marine mammal acoustic detections in the northeastern Chukchi Sea, September 2007–July 2011. Continental Shelf Research 67:127–146, http://dx.doi.org/10.1016/j.csr.2013.07.009.
Hashagen, K.A., G.A. Green, and B. Adams. 2009. Observations of humpback whales, Megaptera novaeangliae, in the Beaufort Sea, Alaska. Northwestern Naturalist 90:160–162, http://dx.doi.org/10.1898/NWN08-40.1.
Higdon, J.W., D.D.W. Hauser, and S.H. Ferguson. 2012. Killer whales (Orcinus orca) in the Canadian Arctic: Distribution, prey items, group sizes, and seasonality. Marine Mammal Science 28(2):E93–E109, http://dx.doi.org/10.1111/j.1748-7692.2011.00489.x.
Ivashchenko, Y.V., R.L. Brownell Jr., and P.J. Clapham. 2013. Soviet whaling in the North Pacific: Revised catch totals. Journal of Cetacean Research and Management 13:59–71.
Ivashin, M.V., and L.M. Votrogov. 1982. Occurrence of baleen and killer whales off Chukotka. Report of the International Whaling Commission 32:499–501.
Ivashin, M.V., and L.M. Votrogov. 1981a. Minke whales, Balaenoptera acutorostrata davidsoni, inhabiting inshore waters of the Chukotka coast. Report of the International Whaling Commission 31:231.
Ivashin, M.V., and L.M. Votrogov. 1981b. Killer whales, Orcinus orca, inhabiting inshore waters of the Chukotka coast. Report of the International Whaling Commission 31:521.
Jeffries, M.O., J.E. Overland, and D.K. Perovich. 2013. The Arctic shifts to a new normal. Physics Today 66:35–40, http://dx.doi.org/10.1063/PT.3.2147.

Kryukova, N.V., E.P. Kruchenkova, and D.I. Ivanov. 2012. Killer whales (Orcinus orca) hunting for walruses (Odobenus rosmarus divergens) near Retkyn Spit, Chukotka. Biology Bulletin 39(9):768–778, http://dx.doi.org/10.1134/S106235901209004X.
Laidre, K.L., and M.P. Heide-Jorgensen. 2012. Spring partitioning of Disko Bay, West Greenland, by Arctic and subarctic baleen whales. ICES Journal of Marine Science 69(7):1,226–1,233, http://dx.doi.org/10.1093/icesjms/fss095.
Ljungblad, D.K., and S.E. Moore. 1983. Killer whale (Orcinus orca) chasing gray whales (Eschrichtius robustus) in the northern Bering Sea. Arctic 36:361–364.
Lowry, L.F., R.R. Nelson, and K.J. Frost. 1987. Observations of killer whales, (Orcinus orca), in western Alaska: Sighting, strandings and predation on other marine mammals. Canadian Field-Naturalist 101:6–12.
Maslanik, J., J. Stroeve, C. Fowler, and W. Emery. 2011. Distribution and trends in Arctic sea ice age through spring 2011. Geophysical Research Letters 38, L13502, http://dx.doi.org/10.1029/2011GL047735.
Mel’nikov, V. 2000. Humpback whales Megaptera novaeangliae off Chukchi Peninsula. Oceanology 40:895–900.
Mel’nikov, V.V., and I.A. Zagrebin. 2005. Killer whale predation in coastal waters of the Chukotka Peninsula. Marine Mammal Science 21(3):550–556, http://dx.doi.org/10.1111/j.1748-7692.2005.tb01248.x.
Mel’nikov, V.V., M.A. Zelensky, and L.A. Aynana. 1999. Humpback whales (Megaptera novaeangliae) in waters off the Chukotka Peninsula. Paper SC/51/CAWS23 presented to the International Whaling Commission Scientific Committee.
Mel’nikov, V.V., I.A. Zagrebin, M.A. Zelensky, and L. Ainana. 2001. The minke whale (Balaenoptera acutorostrata) in offshore waters of the Chukotka Peninsula. Paper SC/52/OS2 presented to the International Whaling Commission Scientific Committee.
Miller, R.V., D.J. Rugh, and J.H. Johnson. 1986. The distribution of bowhead whales, Balaena mysticetus, in the Chukchi Sea. Marine Mammal Science 2(3):214–222.
Milne, R. 2013. Arctic shipping set for record as sea ice melts. Financial Times July 21, 2013, http://www.ft.com/cms/s/0/c947b810-f06a-11e2-929c-00144feabdc0.html.
Mizroch, S.A., D. Rice, D. Zwiefelhofer, J. Waite, and W. Perryman. 2009. Distribution and movements of fin whales in the North Pacific Ocean. Mammal Review 39(3):193–227, http://dx.doi.org/10.1111/j.1365-2907.2009.00147.x.
Moore, S.E., and J.T. Clarke. 1992. Distribution, Abundance and Behavior of Endangered Whales in the Alaskan Chukchi and Western Beaufort Seas, 1991: With a Review 1982–91. OCS Study MMS 92-0029, 126 pp. plus appendices.
Moore, S.E., J.T. Clarke, and M.M. Johnson. 1993. Beluga distribution and movements offshore northern Alaska in spring and summer, 1980–84. Report of the International Whaling Commission 43:375–386.
Moore, S.E., E. Logerwell, L. Eisner, E. Farley, L. Harwood, K. Kuletz, J. Lovvorn, J. Murphy, and L. Quakenbush. In press. Marine fishes, birds and mammals as sentinels of ecosystem variability and reorganization in the Pacific Arctic Region. Chapter 11 in The Pacific Arctic Region: Ecosystem Status and Trends in a Rapidly Changing Environment. J.M. Grebmeier and W. Maslowski, eds, Springer, New York, NY.
Moore, S.E., J.M. Waite, L.L. Mazzuca, and R.C. Hobbs. 2000. Mysticete whale abundance and observations of prey associations on the central Bering Sea shelf. Journal of Cetacean Research and Management 2(3):227–234.
Moore, S.E., J.M. Waite, N.A. Friday, and T. Honkalehto. 2002. Cetacean distribution and relative abundance on the central-eastern and southeastern Bering Sea shelf with reference to oceanographic domains. Progress in Oceanography 55:249–261, http://dx.doi.org/10.1016/S0079-6611(02)00082-4.
Moore, S.E., J.M. Grebmeier, and J.R. Davies. 2003. Gray whale distribution relative to forage habitat in the northern Bering Sea: Current conditions and retrospective summary. Canadian Journal of Zoology 81:734–742, http://dx.doi.org/10.1139/z03-043.
Nasu, K. 1974. Movement of baleen whales in relation to hydrographic conditions in the northern part of the North Pacific Ocean and the Bering Sea. Pp. 345–361 in Oceanography of the Bering Sea with Emphasis on Renewable Resources. D.W. Hood and E.J. Kelley, eds, Institute of Marine Science, University of Alaska, Fairbanks, AK.
National Marine Mammal Laboratory (NMML), Alaska Fisheries Science Center, and the Pacific Marine Environmental Laboratory. 2010. CHAOZ (CHukchi Acoustic, Oceanographic, and Zooplankton) Study 2010 Cruise Report. 25 pp. Available online at: http://www.afsc.noaa.gov/nmml/PDF/CHAOZ-2010-Cruise.pdf.
Nemoto, T. 1959. Food of baleen whales with reference to whale movements. Scientific Report of the Whales Research Institute 14:149–290.
Nikulin, I.P. 1946. Distribution of cetaceans in seas surrounding the Chukchi Peninsula. Trudy Instituta Okeanology 22:255–257.
Ohsumi, S., and Y. Masaki. 1975. Japanese whale marking in the North Pacific, 1963–1972. Bulletin of the Far Seas Fisheries Research Laboratory 13:171–219.
Overland, J.E., and M. Wang. 2013. When will the summer Arctic be nearly sea ice free? Geophysical Research Letters 40: 2,097–2,101, http://dx.doi.org/10.1002/grl.50316.
Perrin, W.F., and R.L. Brownell Jr. 2002. Minke whale. Pp. 750–754 in Encyclopedia of Marine Mammals. W.F. Perrin, B. Wursig, and J.G.M. Thewissen, eds, Academic Press, San Diego, CA.
Quakenbush, L.T., J.J. Citta, J.C. George, R.J. Small, and M.P. Heide-Jørgensen. 2010. Fall and winter movements of bowhead whales (Balaena mysticetus) in the Chukchi Sea and within a potential petroleum development area. Arctic 63(3):289–307.
Rone, B.K., C.L. Berchok, J.L. Crance, and P.J. Clapham. 2012. Using air-deployed passive sonobuoys to detect and locate critically endangered North Pacific right whales. Marine Mammal Science 28(4):E528–E538, http://dx.doi.org/10.1111/j.1748-7692.2012.00573.x.
Sleptsov, M.M. 1961. Fluctuations in the numbers of whales of the Chukchi Sea in various years. Translated by the US Naval Oceanographic Office in 1970. [O kolebanii chislennosti kitov v Chukotskom More v raznyye gody]. Trudy Instituta Morfologiya Zhivotnykh Akademiya Nauk SSSR 34:54–64.
Stafford, K.M., S.E. Moore, P.J. Stabeno, D.V. Holliday, J.M. Napp, and D.K. Mellinger. 2010. Biophysical ocean observation in the southeastern Bering Sea. Geophysical Research Letters 37, L02606, http://dx.doi.org/10.1029/2009GL040724.
Stroeve, J., M. Serreze, S. Drobot, S. Gearhead, M. Holland, J. Maslanik, W. Meier, and T.S. Scambo. 2008. Arctic sea ice extent plummets in 2007. Eos, Transactions American Geophysical Union 89:13–14, http://dx.doi.org/10.1029/2008EO020001.
Suydam, R.S., L.F. Lowry, K.J. Frost, G.M. O’Corry-Crowe, and D. Pikok Jr. 2001. Satellite tracking of eastern Chukchi Sea beluga whales in the Arctic Ocean. Arctic 54(3):237–243.
Suydam, R.S., J.C. George, B. Person, C. Hanns, R. Stimmelmayr, L. Pierce, and G. Sheffield. 2012. Subsistence harvest of bowhead whales (Balaena mysticetus) by Alaskan Eskimos during 2011. Paper SC/64/BRG2 presented to the International Whaling Commission Scientific Committee.
Tomilin, A.G. 1957. Mammals of the USSR and Adjacent Countries. Vol. IX: Cetaceans. Izdatel’stvo Akademi Nauk SSSR. Translated from Russian in 1967 by the Israel Program for Scientific Translations.
US Committee on the Marine Transportation System. 2013. US Arctic Marine Transportation System: Overview and Priorities for Action. 115 pp.
Votrogov, L.M., and M.V. Ivashin. 1980. Sightings of fin and humpback whales in the Bering and Chukchi Seas. Report of the International Whaling Commission 30:247–248.
Weingartner, T., K. Aagaard, R. Woodgate, S. Danielson, Y. Sasaki, and D. Cavalieri. 2005. Circulation on the north central Chukchi Sea Shelf. Deep-Sea Research Part II 52:3,150–3,174, http://dx.doi.org/10.1016/j.dsr2.2005.10.015.
Wiley, D., C. Ware, A. Bocconcelli, D. Cholewiak, A Friedlander, M. Thompson, and M. Weinrich. 2011. Underwater components of humpback whale bubble-net feeding behavior. Behavior 148(5):575–602.
Woodgate, R.A., K. Aagaard, and T.J. Weingartner. 2005. Monthly temperature, salinity, and transport variability of the Bering Strait through flow. Geophysical Research Letters 32, L04601, http://dx.doi.org/10.1029/2004GL021880.
Woodgate, R.A., T.J. Weingartner, and R. Lindsay. 2012. Observed increases in Bering Strait oceanic fluxes from the Pacific to the Arctic from 2001 to 2011 and their impacts on the Arctic Ocean water column. Geophysical Research Letters 39, L24603, http://dx.doi.org/10.1029/2012GL054092.