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Gray whale (Eschrichtius robustus) in the Mediterranean Sea: anomalous event or early sign of climate-driven distribution change?

  • Aviad P. Scheinin (a1), Dan Kerem (a1), Colin D. MacLeod (a2), Manel Gazo (a3) (a4), Carla A. Chicote (a3) and Manuel Castellote (a5)...

On 8 May 2010, a gray whale was sighted off the Israeli Mediterranean shore and twenty-two days later, the same individual was sighted in Spanish Mediterranean waters. Since gray whales were last recorded in the North Atlantic in the 1700s, these sightings prompted much speculation about this whale's population origin. Here, we consider three hypotheses for the origin of this individual: (1) it represents a vagrant individual from the larger extant population of gray whales found in the eastern North Pacific; (2) it represents a vagrant individual from the smaller extant population found in the western North Pacific; or (3) it represents an individual from the previously thought extinct North Atlantic population. We believe that the first is the most likely, based on current population sizes, on known summer distributions, on the extent of cetacean monitoring in the North Atlantic and on the results of a performed route analysis. While it is difficult to draw conclusions from such singular events, the occurrence of this individual in the Mediterranean coincides with a shrinking of Arctic Sea ice due to climate change and suggests that climate change may allow gray whales to re-colonize the North Atlantic as ice and temperature barriers to mixing between northern North Atlantic and North Pacific biomes are reduced. Such mixing, if it were to become widespread, would have implications for many aspects of the marine conservation and ecology of these two regions.

Corresponding author
Correspondence should be addressed to: A.P. Scheinin, Israel Marine Mammal Research and Assistance Center (IMMRAC), The Leon Recanati Institute for Maritime Studies and Department for Maritime Civilizations, The University of Haifa, Mount Carmel, Haifa 31905, Israel email:
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Berzin, A.A. (1984) Soviet studies on the distribution and numbers of gray whale in the Bering and Chukchi Seas from 1968 to 1982. In Jones, M.L., Swartz, S.L. and Leatherwood, S. (eds) The gray whale, Eschrichtius robustus. Orlando, FL: Academic Press, pp. 409419.
Bradford, A.L., Weller, D.W., Ivashchenko, Y.V., Burdin, A.M. and Brownell, Jr R.L. (2008) Seasonal and annual variation in body condition of western gray whales off northeastern Sakhalin Island, Russia. International Whaling Commission Scientific Committee. Paper SC/60/BRG16, 12 pp.
Darling, J.D. (1984) Gray whales off Vancouver Island, British Columbia. In Jones, M.L.Swartz, S.L. and Leatherwood, S. (eds) The gray whale, Eschrichtius robustus. Orlando, FL: Academic Press, pp. 265280.
Dunham, J.S. and Duffus, D.A. (2001) Foraging patterns of gray whales in central Clayoquot Sound, BC, Canada. Marine Ecology Progress Series 223, 299310.
ETOP02 (2006) Global 2' Elevations data set (U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Geophysical Data Center, version 2. 2-minute Gridded Global Relief Data. (accessed 24 May 2010).
Hayes, K.R. and Sliwa, C. (2003) Identifying potential marine pests—a deductive approach applied to Australia. Marine Pollution Bulletin 46, 9198.
Laidre, K.L., Stirling, I., Lowry, L.F., Wiig, Ø., Heide-Jørgensen, M.P. and Ferguson, S.H. (2008) Quantifying the sensitivity of Arctic marine mammals to climate-induced habitat change. Ecological Applications 18 (Supplement), S97S125.
Lindquist, O. (2000) The North Atlantic gray whale Eschrichtius robustus: an historical outline based on Icelandic, Danish–Icelandic, English and Swedish sources dating from ca 1000 AD to 1792. PhD thesis. Universities of St Andrews and Stirling, Scotland.
MacLeod, C.D. (2010) Global climate change, range changes and potential implications for the conservation of marine cetaceans: a review and synthesis. Endangered Species Research (DOI 10.3354/esr00197).
Mate, B.R. and Harvey, J.T. (1984) Ocean movements of radio-tagged gray whales. In Jones, M.L., Swartz, S.L. and Leatherwood, S. (eds) The gray whale, Eschrichtius robustus. Orlando, FL: Academic Press, pp. 577589.
Mead, J.G. and Mitchell, E.D. (1984) Atlantic gray whales. In Jones, M.L., Swartz, S.L. and Leatherwood, S. (eds) The gray whale, Eschrichtius robustus. Orlando, FL: Academic Press, pp. 3353.
Moore, S.E., Grebmeier, J.M. and Davies, J.R. (2002) Gray whale distribution relative to forage habitat in the northern Bering Sea: current conditions and retrospective summary. Canadian Journal of Zoology 81, 734742.
Moore, S.E., Wynne, K.M., Kinney, J.C. and Grebmeier, J.M. (2007) Gray whale occurrence and forage southeast of Kodiak Island, Alaska. Marine Mammal Science 23, 419428.
Moore, S.E. and Huntington, H.P. (2008) Arctic marine mammals and climate change: impacts and resilience. Ecological Applications 18, 157165.
Nerini, M. (1984) A review of gray whale feeding ecology. In Jones, M.L., Swartz, S.L. and Leatherwood, S. (eds) The gray whale, Eschrichtius robustus. Orlando, FL: Academic Press, pp. 423450.
Odell, D.K. (1983) An Atlantic gray whale from Florida. Fifth Biennial Conference on the Biology of Marine Mammals, 27 November–1 December. Boston, MA: New England Aquarium, pp. 7273.
Rugh, D.J. and Fraker, M.A. (1981) Gray whale (Eschrichtius robustus) sightings in Eastern Beaufort Sea. Arctic 34, 186187.
Ruiz, G.M., Carlton, J.T., Grosholz, E.D. and Hines, A.H. (1997) Global invasions of marine and estuarine habitats by non-indigenous species: mechanisms, extent, and consequences. American Zoologist 37, 621632.
Stachowicz, J.J., Terwin, J.R., Whitlatch, R.B. and Osman, R.W. (2002) Linking climate change and biological invasions: ocean warming facilitates nonindigenous species invasions. Proceedings of the National Academy of Sciences of the United States of America 99, 1549715500.
Stevick, P.T., Neves, M.C., Johansen, F., Engel, M.H., Allen, J., Milton, C.C.Marcondes, M.C.C. and Carlson, C. (2010) A quarter of a world away: female humpback whale moves 10000 km between breeding areas. Biology Letters, doi:10.1098/rsbl.2010.0717.
Swartz, S.L., Taylor, B.L. and Rugh, D.J. (2006) Gray whale Eschrichtius robustus population and stock identity. Mammal Review 36, 6684.
Vertyankin, V.V., Vladimirov, V.A., Tyurneva, O.Y., Yakovlev, Y.M.Andreev, A.V. and Burkanov, V.N. (2007) Sightings of gray whales (Eschrichtius robustus) offshore eastern Kamchatka and in the northern Sea of Okhotsk, 2006. International Whaling Commission. Paper SC/59/WP6, 8 pp.
Weller, D.W., Burdin, A.M., Würsig, B., Taylor, B.L. and Brownell, Jr R.L. (2002) The western gray whale: a review of past exploitation, current status and potential threats. Journal of Cetacean Research and Management 4, 712.
Zhu, Q. (2002) Historical records of western Pacific stock of gray whale Eschrichtius robustus in Chinese coastal waters from 1933 to 2002. International Whaling Commission Scientific Committee. Paper SC/02/WGW13, 4 pp.
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Marine Biodiversity Records
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