Demographic History of the Gentoo Penguin (Pygoscelis papua) and the Adélie Penguin (Pygoscelis adeliae) on Admiralty Bay, King George Island, Antarctica

Abstract

Abstract. There is growing evidence that during the past 100 years the climate of the Antarctic Peninsula has changed from a relatively cold environment to an increasingly warmer one. The penguins that breed in the region are sensitive to oceanographic environmental and climatic conditions. They are considered the bellwether sentinels of the ocean because of their sensitivity to environmental changes. The present study aimed to determine the evolutionary history of the Gentoo Penguin (Pygoscelis papua) and Adelie Penguin (Pygoscelis adeliae) at Admiralty Bay, King George Island. A population genetics approach was used to examine the genetic variability of the two penguin species, searching to infer their demographics histories. The D-loop region from the mitochondrial DNA was sequenced in Adelie (n = 53) and Gentoo (n = 29) penguins. These species showed high genetic diversity, reflecting a large ancestral population size. The results also revealed that the Gentoo Penguin has had a stable population over ...