In a significant milestone, giant tortoises have returned to Floreana Island in the Galápagos archipelago after an absence of over 180 years. The reintroduction effort involved releasing 158 juvenile hybrids onto the island, once inhabited by an estimated 20,000 giant tortoises, through a captive breeding program that commenced in 2017. Factors such as whaling, a devastating fire, and human exploitation led to the extinction of the Floreana tortoise population in the 1840s.
James Gibbs, a conservation biologist with the Galápagos Conservancy, likened the event to witnessing his children’s first steps as the young tortoises eagerly explored their new surroundings upon release. These juveniles, expected to reach weights of up to 600 pounds in the next couple of decades, are part of a planned total of 700 individuals to be gradually reintroduced to Floreana. They bear genetic resemblance ranging from 40% to 80% to the extinct Floreana species, crucial for reintroducing the original genetic makeup to the island.
Driven by the goal of not just boosting numbers but also reviving a lost lineage, the initiative aims to contribute to the ecosystem’s restoration over time, given the tortoises’ potential century-long lifespans. The release process involved physically transferring the tortoises to designated release sites on the island’s varied terrains, where they now coexist with a diverse array of wildlife, including humans and non-native species that pose potential risks.
Equipped with GPS trackers for real-time monitoring, the tortoises are being closely observed to ensure their adaptation and settlement into their “new/old” habitat. The tracking technology allows researchers to track their movements and behavior, ensuring the tortoises’ well-being and integration into the island’s ecosystem.
