What's happened
Aldabra Atoll hosts about 183,000 adult and sub-adult Aldabra giant tortoises, the highest count on record, according to a five-year study (2018–2022). The population appears stable despite climate pressures and invasive species. Conservationists say continued vigilance and invasive mammal eradication are essential to sustain gains.
What's behind the headline?
- The story highlights a major conservation success, underscoring long-term protection measures. - It foregrounds climate risks (drought, sea-level rise) and invasive species as ongoing threats, signaling that gains could be eroded without continued intervention. - Readers should consider how wildlife monitoring informs broader biodiversity strategies and how local actions translate to global conservation narratives. - The piece invites attention to the fragility of ecosystems even when numbers surge, stressing actionable steps like invasive mammal eradication and habitat management.
How we got here
Conservation efforts on Aldabra Atoll began decades ago after heavy exploitation in the 19th century reduced numbers. The atoll was designated a nature reserve in 1981 and a UNESCO site in 1982. The latest survey models unobserved tortoises to provide a robust baseline to track future changes.
Our analysis
According to the New York Post and The Guardian, the five-year counts from 2018–2022 place the Aldabra giant tortoise population at roughly 183,000 adults and sub-adults, marking a record high. Both outlets emphasize the conservation history, including the 1981 nature reserve status and the 1982 UNESCO designation, and note future risks from climate change and invasive species. The Guardian also references genetic and age-related longevity studies from Saint Helena’s Jonathan, adding a broader longevity context to giant tortoise biology.
Go deeper
- How will ongoing invasive species eradiation affect population growth?
- What are the specific climate threats Aldabra faces in the next decade?
- Will monitoring data change conservation funding or policies?
More on these topics
-
Science Advances - Peer-reviewed journal
Science Advances is a peer-reviewed multidisciplinary open-access scientific journal established in early 2015 and published by the American Association for the Advancement of Science.
-
The Guardian - Newspaper
The Guardian is a British daily newspaper. It was founded in 1821 as The Manchester Guardian, and changed its name in 1959. Along with its sister papers The Observer and The Guardian Weekly, The Guardian is part of the Guardian Media Group, owned by the S
-
Indian Ocean - Ocean bounded by Africa, Asia, Australia, and Antarctica
The Indian Ocean is the third-largest of the world's five oceanic divisions, covering 70,560,000 km2 (27,240,000 sq mi) or approximately 20% of the water area of Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia to the east. To the south it is bounded by the Southern Ocean or Antarctica, depending on the definition in use. The Indian Ocean has large marginal or regional seas, including the Andaman Sea, the Arabian Sea, the Bay of Bengal, and the Laccadive Sea. Geologically, the Indian Ocean is the youngest of the oceans (being directly preceded by the Tethys Ocean, which fragmented into the Mediterranean Sea and the Indian Ocean only 20 million years ago), and it has distinct features such as narrow continental shelves. Its average depth is 3,741 m. It is the warmest ocean, with a significant impact on global climate due to its interaction with the atmosphere. Its waters are affected by the Indian Ocean Walker circulation, resulting in unique oceanic currents and upwelling patterns. The Indian Ocean is ecologically diverse, with important ecosystems such as coral reefs, mangroves, and seagrass beds. It hosts a significant portion of the world's tuna...
-
Ecology and Evolution - Journal
Ecology and Evolution is a biweekly open-access scientific journal covering all areas of ecology, evolution, and conservation. The Editors in Chief of this journal are Allen Moore, Andrew Beckerman, Jenn Firn, Chris Foote, and Gareth Jenkins.
-
Aldabra giant tortoise - Reptiles
The Aldabra giant tortoise is endemic to the islands of the Aldabra Atoll in the Seychelles. It is one of the largest tortoises in the world.
-
University of Exeter - Public university in Exeter, England
The University of Exeter is a public research university in Exeter, Devon, South West England, United Kingdom. It was founded and received its royal charter in 1955, although its predecessor institutions, St Luke's College, Exeter School of Science, Exete
-
Seychelles Islands Foundation - Manages and protects the World Heritage Sites of Aldabra and Vallee de Mai
Seychelles Islands Foundation manages and protects the World Heritage Sites of Aldabra and Vallee de Mai. The foundation was established as a public trust in 1979, with the President of Seychelles as patron.
-
Seychelles - Country in East Africa
Seychelles, officially the Republic of Seychelles, is an archipelagic island country in the Indian Ocean at the eastern edge of the Somali Sea. The country consists of 115 islands. Its capital and largest city, Victoria, lies 1,500 kilometres east of main