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  Estimating abundance and growth rates in a wild mountain gorilla population (advance online)

Granjon, A.-C., Robbins, M. M., Arinaitwe, J., Cranfield, M. R., Eckardt, W., Mburanumwe, I., et al. (2020). Estimating abundance and growth rates in a wild mountain gorilla population (advance online). Animal Conservation. doi:10.1111/acv.12559.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-7D42-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-A5C3-4
Genre: Journal Article

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Granjon_Estimating_AnimCons_2020.pdf (Publisher version), 543KB
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© 2020 The Authors. Animal Conservation published by John Wiley & Sons Ltd on behalf of Zoological Society of London This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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 Creators:
Granjon, A.-C.1, 2, Author              
Robbins, M. M.3, Author              
Arinaitwe, J., Author
Cranfield, M. R., Author
Eckardt, W., Author
Mburanumwe, I., Author
Musana, A., Author
Robbins, A. M.3, Author              
Roy, J., Author
Sollmann, R., Author
Vigilant, L.4, Author              
Hickey, J. R., Author
Affiliations:
1The Leipzig School of Human Origins (IMPRS), Max Planck Institute for Evolutionary Anthropology, Max Planck Society, ou_1497688              
2Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society, Deutscher Platz 6, 04103 Leipzig, DE, ou_1497674              
3Gorillas, Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society, ou_2149637              
4Molecular Genetics Laboratory, Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society, ou_2149639              

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Free keywords: capture–mark–recapture, Gorilla beringei beringei, monitoring, non-invasive genetic sampling, population growth, population survey
 Abstract: Abstract Monitoring population size and growth over time is vital for the conservation of endangered species. Mountain gorillas Gorilla beringei beringei remain in two small populations that span the borders of the Democratic Republic of Congo, Rwanda and Uganda. Each population contains two subpopulations that receive differing levels of protection: the monitored groups are visited daily by park staff and researchers and can be counted by sight, whereas the number and growth rate of unmonitored gorillas must be estimated indirectly. Here, we re-analyze published data from a survey in 2010 combined with new results from a survey conducted during two sampling occasions in 2015 and 2016 to estimate mountain gorilla abundance and growth in the Virunga Massif between 2010 and 2016. Using genetic analysis of non-invasively collected samples and two capture?mark?recapture estimates, we estimated that the 186 detected genotypes represented 221 (95% credible interval: 204?243) to 251 (205?340) unmonitored gorillas in 2016. Together with the 418 monitored gorillas, the overall population of the Virunga Massif thus reached 639 (622?661) to 669 (623?758) individuals. We estimated the growth of the entire Virunga Massif population at about 3% per year, but determined that the growth of the monitored gorillas (4.4%) mainly drove that increase. In contrast, the trend of the unmonitored subpopulation could not be determined with confidence because both models provided 95% CI that encompassed zero: 0.5% per year (?0.7% to +1.7%) and 1.1% (?2.7% to +4.4%). While the overall growth rate represents a rare success story for primate conservation, our results highlight the need for greater protection of unmonitored gorillas.

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Language(s): eng - English
 Dates: 2020-01-13
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1111/acv.12559
 Degree: -

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Title: Animal Conservation
Source Genre: Journal
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Publ. Info: John Wiley & Sons, Ltd (10.1111)
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ISBN: 1367-9430