Beluga whales are distributed throughout seasonally ice-covered arctic and subarctic waters of the Northern Hemisphere and are closely associated with open leads in ice-covered regions. Depending on season and region, beluga whales may occur in both offshore and coastal waters, with concentrations in Cook Inlet, Bristol Bay, Norton Sound, Kasegaluk Lagoon, and the Mackenzie Delta. It is assumed that most beluga whales from these summering areas over winter in the Bering Sea, excluding those found in the northern Gulf of Alaska. Seasonal distribution is affected by ice cover, tidal conditions, access to prey, temperature, and human interaction. During the winter, beluga whales occur in offshore waters associated with pack ice. In the spring, they migrate to warmer coastal estuaries, bays, and rivers for molting and calving. Annual migrations may cover thousands of kilometers. Belugas grow as long as 4.5 m and weigh up to 1500kg. Calves are born in the summer and remain with their mothers for about 24 months. They are slate gray to pinkish brown at birth but become completely white by the time they are adults.
- HOBBS, R. C., K. E. W. SHELDEN, D. J. RUGH, and S. A. NORMAN.
2008. 2008 status review and extinction risk assessment of Cook Inlet belugas (Delphinapterus leucas). AFSC Processed Rep. 2008-02, 116 p. Alaska Fish. Sci. Cent., NOAA, Natl. Mar. Fish. Serv., 7600 Sand Point Way NE, Seattle WA 98115. (.pdf, 3.62MB) Online.
- O'CORRY-CROWE, G., R. SUYDAM, J. ORR, L. LOWRY, K. FROST, D. LITOVKA, and R. HOBBS.
2007. Combination of satellite telemetry and molecular genetic analysis in the study of belugas whales in the western nearctic, p. 37. In P. Sheridan, J. W. Ferguson, and S. L. Dowling (editors), Report of the National Marine Fisheries Service Workshop on Advancing Electronic Tag Technologies and Their Use in Stock Assessments. U.S. Dep. Commer., NOAA Tech. Memo. NMFS-F/SPO-82.
- GOETZ, K. T., D. J. RUGH, A. J. READ, and R. C. HOBBS.
2007. Habitat use in a marine ecosystem: Beluga whales Delphinapterus leucas in Cook Inlet, Alaska. Mar. Ecol. Prog. Ser. 330:247–256.
- HOBBS, R. C., K. E. W. SHELDEN, D. J. VOS, K. T. GOETZ, and D. J. RUGH.
2006. Status review and extinction assessment of Cook Inlet belugas (Delphinapterus leucas). AFSC Processed Rep. 2006-16, 74 p. Alaska Fish. Sci. Cent., Natl. Mar. Fish. Serv., NOAA, 7600 Sand Point Way NE, Seattle WA 98115. (.pdf, 2.42 MB). Online.
- Search the AFSC database for additional Beluga Whale publications
- Cook Inlet Beluga Population: Failure to Thrive?
1.46MB Online.
- Using Advanced Techniques to Determine Age Categories of Belugas
2.4MB Online.
- Fall and Winter Movements of Beluga in Cook Inlet, Alaska
826KB Online.
- Search the AFSC database for additional Beluga Whale posters