Recent genetic research reveals that the iconic Gentoo Penguin is actually comprised of four distinct species, including one that was previously unknown to science. Alarmingly, three of these species are increasingly threatened by climate change.
Geographical distribution of the four distinct species of Gentoo Penguins in the Southern Ocean. Image credit: Noll et al., doi: 10.1038/s42003-026-10081-7.
Among seabirds, the Gentoo Penguin Complex (Pygocelis papua) showcases a significant example of adaptive divergence, with unique morphological, ecological, and genetic characteristics among lineages in the Southern Ocean.
Recent studies indicate the presence of four to six distinct evolutionary lineages, each inhabiting environments with minimal ecological overlap. This suggests that local conditions may significantly influence their adaptive divergence.
“The taxonomy of the gentoo penguin has long been contentious,” stated Professor Lauri Bowie of the University of California, Berkeley. “For over a century, the debate over the number of species and subspecies has persisted.”
“This paper aims to resolve that issue using a cutting-edge integrative approach.”
Professor Bowie and colleagues have presented compelling genetic proof that what was once believed to be a single, widely dispersed species of gentoo penguin is actually four separate species.
“North of the polar front, where temperatures are warmer, there exists an eastern lineage: Pygocelis teniata, found on Crozet Island, Marion Island, and Macquarie Island. The northern lineage, Pygocelis papua, is limited to the Falkland/Malvinas Islands and Martillo Islands in South America,” the researchers explained.
“Just above the polar front is a newly identified southeastern lineage, Pygothelis kerguelensis, which evolved on Kerguelen Island and possibly nearby Heard Island.”
“Below the polar front, the most populous group is Pygocelis Elswati, found along the Antarctic Peninsula, the coast of Antarctica, and South Georgia Island.”
Pygothelis kerguelensis was previously overlooked due to its similarities to other gentoo species, with only subtle differences in size and vocalizations. Its distinctive white underside and black back provide effective camouflage against predators while hunting in marine environments.
However, genetic analysis has deemed it a cryptic species, substantially unique from its counterparts.
“In Antarctica, various species, not just gentoo penguins, are at risk due to climate change,” stated Professor Juliana Viana from Andres Bello National University. “Gentoo penguins face the most significant threats in the subantarctic region—a collection of widely distributed islands governed by several nations, including Chile, South Africa, France, the Netherlands, Australia, and New Zealand.”
“It is crucial for conservation agencies in all involved countries to recognize and protect these three unique gentoo penguin species.”
The team’s study was published in the journal Communication Biology.
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D. Knoll et al.. Integrative evidence reveals adaptive divergence and speciation in gentoo penguins. Commun. Biol. published online on April 23, 2026. doi: 10.1038/s42003-026-10081-7
Source: www.sci.news
