Increased sightings of subArctic cetaceans in the eastern Chukchi Sea, 2008–2016: population recovery, response to climate change, or increased survey effort?
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Cetacean occurrence in the Chukchi Sea is seasonal and primarily driven by annual sea ice retreat and prey occurrence in spring through fall. Humpback whales (Megaptera novaeangliae), fin whales (Balaenoptera physalus), and minke whales (Balaenoptera acutorostrata), although often found in polar waters elsewhere, are not common in the eastern Chukchi Sea, and here are referred to as “subArctic” species. Increasing numbers of these subArctic cetacean species were documented during aerial surveys in the eastern Chukchi Sea (67°–72°N, 157°–169°W) in July–October 2008–2016. The majority (78%) of these sightings occurred on the continental shelf in the south-central Chukchi Sea (67°–69°N, 166°–169°W) in August and September. During similar aerial surveys in 1982–1991, there was a complete lack of sightings of subArctic species. The disparity in sightings between the two time periods could be due to increased marine mammal survey effort in recent years during the months when subArctic cetacean species would be expected to occur, population recoveries from commercial whaling, climate change, or, most likely, a combination of all three.
KeywordsHumpback whale Megaptera novaeangliae Fin whale Balaenoptera physalus Minke whale Balaenoptera acutorostrata Alaska Aerial survey Climate change Chukchi Sea Arctic
The Aerial Surveys of Arctic Marine Mammals (ASAMM) project was funded by the U.S. Department of the Interior, Bureau of Ocean Energy Management (BOEM), Alaska Outer Continental Shelf Region, Anchorage, Alaska through Inter-agency Agreements M08PG20023, M11PG00033, and M16PG00013 with the Alaska Fisheries Science Center (AFSC) as part of the BOEM Alaska Environmental Studies Program. ASAMM was supported by Charles Monnett, Jeffrey Denton, and Carol Fairfield (BOEM CORs). At the AFSC Marine Mammal Laboratory, additional support was provided by Robyn Angliss, Stefan Ball, Phil Clapham, Mary Foote, Nancy Friday, Dave Rugh, Kim Shelden, Janice Waite, Joanne Wejak, and other administrative personnel. At the Joint Institute for the Study of the Atmosphere and Ocean, support was provided by Amy Kennedy, Julie Mocklin, and administrative personnel. Clearwater Air, Inc., the National Oceanic and Atmospheric’s Aircraft Operations Center, and their pilots and mechanics kept us airborne and safe. Real-time flight following via satellite link was provided by numerous individuals in the Department of the Interior. Programing support was provided by Mike Hay (XeraGIS). Numerous dedicated observers have enthusiastically participated in these surveys. Our sincerest thanks to all!
- Aerts LAM, Hetrick W, Sitkiewicz S, Schudel C, Snyder D, Gumtow R (2013) Marine mammal distribution and abundance in the northeastern Chukchi Sea during summer and early fall, 2008–2012. Final Report prepared by LAMA Ecological for ConocoPhillips Company, Shell Exploration and Production Company, and Statoil USA E&P, Inc. https://www.chukchiscience.com/portals/0/Public/Science/MarineMammals/2012_CSESP_MarineMammals_Final_Report.pdf. Accessed 23 Aug 2016
- Aguilar A (2002) Fin whale. In: Perrin WF, Wursig B, Thewissen JGM (eds) Encyclopedia of marine mammals. Academic Press, San Diego, pp 435–438Google Scholar
- Bakhmutov V, Whitledge T, Wood K, Ostrovskiy A (2009) Report on the execution of marine research in the Bering Strait, East Siberian and the Chukchi Sea by the Russian–American Expedition under the program of “RUSALCA” during the period from 23 August through 30 September, 2009, Bremerhaven, PANGAEA. http://epic.awi.de/31281. Accessed 27 Feb 2017
- Berchok CL, Crance JL, Garland EC, Mocklin JA, Stabeno PJ, Napp JM, Rone BK, Spear AH, Wang M, Clark CW (2015) Chukchi Offshore Monitoring In Drilling Area (COMIDA): Factors affecting the distribution and relative abundance of endangered whales and other marine mammals in the Chukchi Sea. Final report of the Chukchi Sea Acoustics, Oceanography, and Zooplankton Study, OCS Study BOEM 2015-034. National Marine Mammal Laboratory, Alaska Fisheries Science Center, NMFS, NOAA. http://www.afsc.noaa.gov/nmml/PDF/CHAOZ_final_report.pdf. Accessed 23 Aug 2016
- Clapham P (2002) Humpback whale. In: Perrin WF, Wursig B, Thewissen JGM (eds) Encyclopedia of marine mammals. Academic Press, San Diego, pp 589–592Google Scholar
- Clapham PJ, Brownell RL Jr (1996) Potential for interspecific competition in baleen whales. Rep Int Whal Comm 46:361–367Google Scholar
- Clarke JC, Brower AA, Ferguson MC, Willoughby AL (2017) Distribution and relative abundance of marine mammals in the eastern Chukchi and western Beaufort seas, 2015, Annual Report. OCS Study BOEM 2017-019. National Marine Mammal Laboratory, Alaska Fisheries Science Center, NMFS, NOAA, pp 426Google Scholar
- Delarue J, Martin B, Hannay D, Berchok C (2013) Acoustic occurrence and affiliation of fin whales detected in the northeastern Chukchi Sea, July to October 2007–2010. Arct 66:159–172Google Scholar
- Grebmeier JM (2012) Shifting patterns of life in the Pacific Arctic and Sub-Arctic Seas. Annu Rev Mar Sci 4:63–78. https://doi.org/10.1146/annurev-marine-120710-100926 CrossRefGoogle Scholar
- Hain JHW, Ellis SL, Kenney RD, Slay CK (1999) Sightability of right whales in coastal waters of the southern United States with implications for the aerial monitoring program. In: Mcdonald L, Laake JL, Robertson DG, Amstup SC, Garner GW (eds) Marine mammal survey and assessment methods. AA Balkema, Rotterdam, pp 191–207Google Scholar
- LGL Alaska Research Associates Inc, JASCO Applied Sciences Inc, and Greeneridge Sciences Inc (2014) Joint monitoring program in the Chukchi and Beaufort Seas, 2012. LGL Alaska Final Report P1272-2 for Shell Offshore, Inc. ION Geophysical, Inc., and Other Industry Contributors, National Marine Fisheries Service, and US Fish and Wildlife Service, pp 320. http://www.nmfs.noaa.gov/pr/permits/incidental/oilgas/ion_shell_2012iha_jmp_final_comprpt.pdf. Accessed 23 Aug 2016
- Lowry LF, Sheffield G, George JC (2004) Bowhead whale feeding in the Alaskan Beaufort Sea, based on stomach content analyses. J Cetacean Res Manage 6:215–223Google Scholar
- Melnikov VV, Zelensky MA, Aynana LA (1999) Humpback whales (Megaptera novaeangliae) in waters off the Chukotka Peninsula. Paper SC/51/CAWS23 presented to the International Whaling Commission Scientific CommitteeGoogle Scholar
- Melnikov VV, Zagrebin IA, Zelensky MA, Ainana L (2001) The minke whale (Balaenoptera acutorostrata) in offshore waters of the Chukotka Peninsula. Paper SC/52/OS2 presented to the International Whaling Commission Scientific CommitteeGoogle Scholar
- Moore SE, Clarke JT (1992) Distribution, abundance and behavior of endangered whales in the Alaskan Chukchi and western Beaufort seas, 1991: with a review 1982-91, Final Report. OCS Study MMS 92-0029. SAIC Maritime Services Division, pp 237Google Scholar
- Muto MM, Helker VT, Angliss RP, et al (2016) Alaska marine mammal stock assessments, 2015. US Dep Commer, NOAA Tech Memo NMFSAFSC-323, p 300. https://doi.org/10.7289/V5/TM-AFSC-323
- 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. In: Hood DW, Kelley EJ (eds) Oceanography of the Bering Sea with emphasis on renewable resources. University of Alaska, Fairbanks, pp 345–361Google Scholar
- Perrin WF, Brownell RL Jr (2002) Minke whale. In: Perrin WF, Wursig B, Thewissen JGM (eds) Encyclopedia of marine mammals. Academic Press, San Diego, pp 750–754Google Scholar
- Witteveen BH, Wynne KM (2016) Trophic niche partitioning and diet composition of sympatric fin (Balaenoptera physalus) and humpback whales (Megaptera novaeangliae) in the Gulf of Alaska revealed through stable isotope analysis. Mar Mamm Sci 32:1319–1339. https://doi.org/10.1111/mms.12333 CrossRefGoogle Scholar