Gentoo Penguins Split into Four Species, Challenging Climate Change 'Winner' Status
Research published in Communications Biology by Juliana A. Vianna, Jane Younger, and a team of 20 scientists advocates for the reclassification of gentoo penguins into four distinct species. This conclusion arises from genomic analysis of 64 penguins across ten colonies. The identified species include the northern gentoo (Pygoscelis papua) found in the Falkland and Martillo Islands, the eastern gentoo (Pygoscelis taeniata) inhabiting Crozet, Marion, and Macquarie Islands, the newly classified Pygoscelis kerguelensis from the Kerguelen Islands, and the southernmost Pygoscelis ellsworthi located in coastal Antarctica, the Antarctic Peninsula, and South Georgia Island. The findings emphasize unique genetic adaptations and pressing conservation challenges amid threats like avian influenza, population decline, and climate change. The next phase involves evaluations by avian taxonomic committees.
Key facts
- Study published in Communications Biology in late April 2026 by 23 researchers including Juliana A. Vianna and Jane Younger.
- Genomes of 64 gentoo penguins from ten breeding colonies were sequenced.
- Four distinct species identified: Pygoscelis papua, Pygoscelis taeniata, Pygoscelis kerguelensis (newly described), and Pygoscelis ellsworthi.
- Northern gentoo lives on Falkland and Martillo Islands; eastern gentoo on Crozet, Marion, and Macquarie islands; southeastern lineage on Kerguelen Islands; southernmost on coastal Antarctica, Antarctic Peninsula, and South Georgia Island.
- Body sizes decrease closer to the South Pole; each species has unique genetic adaptations.
- Southern gentoo has genes for temperature regulation, fat storage, and light perception.
- Eastern gentoo has genes for energy conservation during long dives.
- Northern gentoo has genetic changes centered on digestion and foraging.
- Falkland Islands gentoos hit by avian influenza in 2024.
- Macquarie Island population is declining.
- Sub-Antarctic lineages projected to lose habitat due to climate change.
- Previous single-species classification masked regional declines.
- Next step: assessment by major avian taxonomic committees.
- Heather Lynch of Stony Brook University commented on the study.
- Earlier 2020 paper by Younger argued for four species.
Entities
Institutions
- Andrés Bello National University
- University of Tasmania
- Communications Biology
- University of California, Berkeley
- Stony Brook University
- Smithsonian
Locations
- Chile
- Australia
- Falkland Islands
- Martillo Islands
- South America
- Crozet Islands
- Marion Islands
- Macquarie Islands
- Kerguelen Islands
- Indian Ocean
- Antarctica
- Antarctic Peninsula
- South Georgia Island
- Western Antarctic Peninsula