The introduction of goats to Seychelles islands created a long-term conservation problem, with one of the earliest eradication efforts recorded on Aride Island in 1920. The study titled ‘Introduced mammals on Western Indian Ocean islands’ documents how introduced mammals became targets of conservation programmes across the Western Indian Ocean. Goats were among the species considered most damaging because they could heavily alter island vegetation. On Aride, the response came decades after the animals had been introduced, making the island’s goat removal one of the earliest recorded mammal eradications in the region.
Why were goats removed from the Seychelles island after 50 years of introduction
The problem was part of a much wider pattern across the Western Indian Ocean. According to the study, Gérard Rocamora and colleagues recorded 74 eradication attempts involving introduced mammals on 45 islands in the region. Almost all of those operations took place in the Seychelles, Mauritius and its dependencies, or the Îles Éparses.The researchers found that goats were among the larger introduced herbivores targeted by conservationists. Their presence was particularly difficult for small islands because vegetation there had evolved without many of the grazing mammals found on larger continents.The study identifies Aride Island in the Seychelles as the site of the earliest recorded mammal eradication in the Western Indian Ocean region. Goats were eradicated there by shooting before 1920, according to the historical records compiled by the researchers.That early operation was significant because it showed that removing an introduced animal could become a conservation priority when its presence threatened the natural character of an island.
Image Credit: William Crochot / Wikimedia Commons
Aride Island became an early test of conservation
Aride was not the only Seychelles island where goats became a problem. The study records later attempts to remove feral goats from several other islands, showing how the issue developed into a broader conservation challenge.The researchers documented goat eradication attempts on 5 islands covering areas of up to 11,115 hectares. This was considerably different from dealing with small populations of animals around human settlements. Conservation teams had to search landscapes where introduced animals could move freely and survive without direct human care.The history also illustrates why island conservation can require a different approach from mainland wildlife management. Once an introduced species becomes established, simply reducing its numbers may not be enough. Animals can survive in small numbers and reproduce again, allowing a population to recover.For this reason, later eradication projects often involved much more organised searches and repeated monitoring.
What happened as eradication programmes expanded
The study shows that eradication work in the Seychelles gradually became more extensive. While the Aride goat operation occurred before 1920, three quarters of all the eradication attempts documented in the research took place after 2000.This increase reflected a growing effort to restore island ecosystems by removing introduced mammals rather than simply controlling their numbers. The researchers recorded eradication attempts involving 9 introduced mammal species, including goats, hares, rabbits, cats, rats and mice.Goats stood apart because of their size and their ability to consume substantial amounts of vegetation. They were targeted on islands where conservationists considered their presence incompatible with native ecosystems.The scale of the work varied considerably. Some operations involved tiny islands, while others covered thousands of hectares. The study therefore presents the history of eradication as a gradual shift from isolated efforts to a much broader conservation strategy.
The Seychelles recorded repeated goat removal programms
The history did not end with the early removal of goats from Aride. The study records further goat eradication efforts on the Aldabra islands of Polymnie and Ile Esprit, where the animals had disappeared by the 1970s after control measures.Aldabra later became the location of one of the Seychelles’ most ambitious goat eradication programmes, although the study distinguishes this from the earlier cases where goats died out after control. It records eradication attempts on several islands within the atoll, illustrating how difficult complete removal could become when goats were already established across a large area.The researchers also note that eradication records need to distinguish between a population being deliberately eliminated and animals simply dying out following control. This distinction matters when comparing the success of conservation programmes.
What does the study reveal about island restoration
The history of goats in the Seychelles demonstrates how an introduction that may initially appear minor can become a conservation issue lasting for generations. The animals were not native to the islands, yet once established, they became part of the landscape and required deliberate action to remove them.The study’s wider dataset shows that this was not an isolated problem. Across the Western Indian Ocean, conservationists attempted to remove introduced mammals from dozens of islands. The purpose was generally to protect native biodiversity by eliminating animals that had not evolved as part of those ecosystems.For the Seychelles, goats became one of the clearest examples of why island restoration can involve removing species rather than adding them. Aride’s goat eradication before 1920 was an early example of this approach, followed decades later by increasingly ambitious operations elsewhere. More than a century after the earliest recorded goat eradication, the case remains an example of how protecting an island’s native ecosystem can sometimes mean removing an animal that humans once brought there.
