Censuses of penguin, Blue-eyed Shag Phalacrocorax atriceps and Southern Giant Petrel Macronectes giganteu populations on the Antarctic Peninsula, 2001-2007

Here, we report census results for Adélie Penguin Pygoscelis adeliae, Gentoo Penguin P. papua, Chinstrap Penguin P. antarctica, Blue-eyed Shag Phalacrocorax atriceps, and Southern Giant Petrel Macronectes giganteus collected as part of the Antarctic Site Inventory project during 2001-2007. We report on new breeding populations of Gentoo Penguins in the Yalour Islands, Galindez Island and Cape Tuxen (Antarctic Peninsula), which reflect the southernmost known breeding colonies of this species. We also document range expansion and population increases for Gentoo Penguins throughout the Antarctic Peninsula. Further, we report on the continuing population decline of Adélie Penguins in the Antarctic Peninsula, and present records of all three pygoscelid penguins breeding at Booth Island, the fifth known site where these species nest contiguously on the Antarctic Peninsula.