The winter migration of Adelie penguins breeding in the Ross Sea sector ofAntarctica

Satellite telemetry was used to monitor the migratory movements of a single Adelic penguin (Pygoscelis adeliae) from Cape Hallett (72.31 degreesS, 170 .21 degreesE) following the 1997/1998 breeding season. Locations were obtai ned using the ARGOS satellite system and compared with the migratory paths taken by two penguins from the Northern Colony at Cape Bird, Ross Island (7 7.22 degreesS, 166.48 degreesE) following the 1990/1991 breeding season. Al though the sample sizes are small, if representative they would indicate th at: (1) Adelie penguins breeding in the Ross Sea follow a common migratory path, (2) Adelie penguins breeding in the Ross Sea may travel to a common o ver-winter feeding ground west and north of the Balleny Islands, and (3) Ad elie penguins breeding at 77 degreesS on Ross Island travel nearly twice th e distance during their over-winter migration as do those penguins breeding at Cape Hallett and colonies further north. While the Cape Hallett penguin was tracked successfully for 172 days, a record for Adelie penguins, the p roblem of long-term attachment of transmitters to penguins remains.