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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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A.A. Berzin (1984) Soviet studies on the distribution and numbers of gray whale in the Bering and Chukchi Seas from 1968 to 1982. In M.L. Jones , S.L. Swartz and S. Leatherwood (eds) The gray whale, Eschrichtius robustus. Orlando, FL: Academic Press, pp. 409419.

C.D. MacLeod (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).

B.R. Mate and J.T. Harvey (1984) Ocean movements of radio-tagged gray whales. In M.L. Jones , S.L. Swartz and S. Leatherwood (eds) The gray whale, Eschrichtius robustus. Orlando, FL: Academic Press, pp. 577589.

S.E. Moore and H.P. Huntington (2008) Arctic marine mammals and climate change: impacts and resilience. Ecological Applications 18, 157165.

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Marine Biodiversity Records
  • ISSN: -
  • EISSN: 1755-2672
  • URL: /core/journals/marine-biodiversity-records
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