![]() ![]() A group of nine (four females and five males) aye-ayes caught in different locations were released on the island in 1967. At least four groups of white-fronted lemurs and eight groups of black-and-white ruffed lemurs appeared live on the island in 1984. One aye-aye was sighted in 1975, two in 1981, a mother and her infant in 1983 and another two individuals in 1984. Supporting evidence from individual studiesĪ study in 1967-1985 in a coastal rainforest on Nosy Mangabe island in Madagascar found that populations of aye-ayes Daubentonia madagascariensis, white-fronted lemurs Eulemur albifrons and black-and-white ruffed lemurs Varecia variegata variegata that were reintroduced as groups, had persisted at least 18 years (aye-ayes) and 55 years (white-fronted lemurs, black-and-white ruffed lemurs) post-release. One controlled study in Indonesia found that all Sumatran orangutans survived for at least three months after reintroduction in groups, alongside other interventions.Two before-and-after studies in Gabon and the Republic of Congo found that the majority of western gorillas survived for at least nine months to four years, after reintroduction in groups, alongside other interventions.Four studies in Guinea, Liberia and the Republic of Congo found that the majority of chimpanzees survived for at least two to five years, after reintroduction in groups, alongside other interventions. One study in The Gambia found that a population of introduced chimpanzees increased 25 years after reintroduction in groups, alongside other interventions.One study in Madagascar found that introduced black-and-white ruffed lemurs Varecia variegata had similar diets to individuals in a wild population after reintroduction in groups, alongside other interventions.Seven studies in Belize, Brazil, French Guiana, Madagascar, and South Africa found that a majority of primates survived after between two and thirty months. Seven studies in Brazil, French Guiana, Madagascar, and South Africa found that a minority of primates survived for at least 15 weeks to seven years after reintroduction in groups, alongside other interventions.Two studies in Madagascar and India found that primate populations persisted 4-55 years after reintroduction in groups, alongside other interventions. ![]() ![]() Two studies in Brazil and Thailand found that populations of introduced primates declined after reintroduction in groups, alongside other interventions, while one study in Belize recorded an increase in populations. ![]()
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