Scientists studying gentoo penguins made a surprising discovery after examining their DNA. A new study found that what was previously classified as one group of gentoo penguins actually consists of four distinct species.
Researchers analysed the genomes of 64 penguins from 10 breeding colonies across their geographical range.
The genetic evidence revealed thousands of differences between the populations, helping scientists understand how they evolved separately.
Gentoo penguins live across Antarctica, South America and remote islands, making them particularly challenging to study. Their isolated habitats had also made it difficult to determine whether different populations were species or subspecies.
Using whole genome sequencing, researchers examined the genetic makeup of penguins from colonies spread across the genus’ range. They found clear genetic differences between four populations.
Scientists estimate that the groups began diverging around 300,000 to 500,000 years ago.
The study found that the different gentoo species have developed genetic traits suited to their individual environments.
The southern gentoo penguin, found around the Antarctic Peninsula and South Georgia, has more genes associated with fat and lipid storage and heat production. These characteristics can help survival in colder conditions.
The northern gentoo penguin, found around South America, has more genes linked to cardiac contraction and muscle activity. Researchers suggest these adaptations may help the birds remain underwater while hunting.
The discovery is significant for both science and conservation. Genetic research is giving scientists a clearer understanding of penguin diversity and showing how different populations have adapted to their surroundings.
That knowledge could become increasingly important as climate change affects penguin habitats. Island species with small populations can be particularly vulnerable to rising sea levels and changing ecosystems, because they may have nowhere else to go.
For scientists, identifying four gentoo species provides a stronger foundation for studying and protecting them.