The Roosevelt – Rondon expedition marmoset (Mico marcai) : unveiling the conservation status of a data deficient species

Silva, FE ORCID:, EL Bizri, HR, Goncalves, JR, Lemos, LP, Araujo, RC, Lima, IJ, Tavares, AS, Santana, MI, Franco, CLB and Boubli, JP ORCID: 2020, 'The Roosevelt – Rondon expedition marmoset (Mico marcai) : unveiling the conservation status of a data deficient species' , Oryx, 54 (4) , pp. 539-545.

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The Roosevelt-Rondon Expedition marmoset, Mico marcai, was collected in 1914 and to date, all information on this species comes from three skins brought back by the Expedition and two additional skins collected in the 1990s. It is no surprise then that M.marcai has been classified as Data Deficient (DD). Given that Mico marcai’s suspected range sits on the path of the advancing Brazilian “Arc-of-Deforestation”, it is urgent that relevant data be collected to assess this taxon. Here we present the first comprehensive field data on the distribution, population size and threats on M. marcai with the goal of removing the species from the DD category. From 2012 to 2015, we surveyed for the species in 11 localities, in and around the Marmelos-Aripuanã interfluve, and estimated density using distance sampling on 10 transects. We also used spatial predictive modelling to project the amount of habitat that will be lost within its range in 18 years under different deforestation scenarios. We found marmosets in 14 localities and calculated its Extent of Occurrence to be 31,073 km2. We walked 271 km and detected 30 marmoset groups, allowing us to estimate their density to be 8.31 individuals/km2 and a total population of 258,217.71 individuals. By a “Business as usual” scenario, 20,181 km2 of habitat will be lost in three marmoset generations (~18 years), compromising 33% of the species’ range. Accordingly, M. marcai should be classified as globally Vulnerable under category A3c. Following our study, we propose the Amazonian marmosets, genus Mico, should undergo similar re-assessment as their ranges all fall in the path of the Arc-of-Deforestation.

Keywords: Amazonian marmosets, Conservation Status, Data Deficient, Habitat Loss, Southern Amazonia

Item Type: Article
Schools: Schools > School of Environment and Life Sciences > Ecosystems and Environment Research Centre
Journal or Publication Title: Oryx
Publisher: Cambridge University Press
ISSN: 0030-6053
Related URLs:
Funders: Conselho Nacional de Pesquisas, CNPq Brazil, Conservation Leadership Program CLP, Idea Wild, Conservation INternational, Primate Conservation Inc, International Primatological Society, Mamiraua Sustainable Development Institute
Depositing User: Prof JP Boubli
Date Deposited: 12 Mar 2018 09:53
Last Modified: 15 Feb 2022 22:56

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