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common marmosets
Invasion by nonindigenous species has been recognized as the second most important threat to global biodiversity because it can increase the risks of extinction of native animals due to introduction of new diseases, predation, and competition for food and shelter.

Mico Estrela
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The common marmosets, not originally from this area, are considered an invasive species to the Rio de Janeiro State. Two species were introduced to Rio de Janeiro: the common marmoset (Callithrix jacchus) from northeastern Brasil and the black-tuffed marmoset (Callithrix penicillata) from Brasilian Cerrado.

The marmosets found, in the occurence range of Golden Lion Tamarin, favorable conditions for surviving and reproducing. It is very important to know the biology, demography, and behavior of the marmosets in its new habitat to determine the impact they cause for, not only the Golden Lion Tamarins, but also for all the others species of fauna and flora.
Mico Estrela
click to enlarge

Researches have been conducted since 1998. Results have showed that there is competion beetwen tamarins and marmosets. The Callithrix Management Committee recomended and IBAMA approved the management of these invasive species. AMLD will test the esterilization of reproductive males and females of Callithrix spp. AMLD will also remove 100 marmosets to several institutions authorized by IBAMA. To avoid new introductions, AMLD will develop a public awareness campaign and a management training course devoted to public agents working on law enforcement.
Criação Grevy•Conti Comunicação+Design - Adaptação e Desenvolvimento Mauricio Fernandes