Djaffa Mountains guereza (Colobus guereza gallarum) abundance in forests of the Ahmar Mountains, Ethiopia
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Published:2023-10-20
Issue:2
Volume:10
Page:13-23
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ISSN:2363-4715
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Container-title:Primate Biology
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language:en
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Short-container-title:Primate Biol.
Author:
Kufa Chala AdugnaORCID, Bekele Afework, Atickem Anagaw, Zinner DietmarORCID
Abstract
Abstract. The size and density of a population are essential parameters in primate ecology and conservation. Such information, however, is still scarce for many forest primate species. The Djaffa Mountains guereza (Colobus guereza gallarum) is an endemic Ethiopian taxon for which data about its distribution and population size are missing. Therefore, we aimed to estimate the abundance and population size of the Djaffa Mountains guereza in four forests in the Ahmar Mountains southeast of the Ethiopian Rift Valley. We conducted line-transect surveys in the forests. Within an area of 183 km2, we sampled 19 transects covering a distance of 75.9 km. We encountered 73 guereza clusters which most likely represent social groups. Since the detection distances and cluster sizes did not differ among the four forests, we applied a conventional distance sampling (CDS) model and estimated a population density of 20.6 clusters per square kilometer, i.e., 109.6 individuals per square kilometer or 20 061 individuals within the complete study area. This abundance is relatively high compared to other C. guereza taxa. However, given that the habitat and population of C. g. gallarum are already highly fragmented, further monitoring of the population and exploration of the possibilities of reconnecting its habitat should be priorities for the conservation of this taxon.
Publisher
Copernicus GmbH
Subject
Animal Science and Zoology
Reference80 articles.
1. Abdala, T., Eshetu, G., and Worku, A.: A participatory assessment of forest biodiversity resources and level of threat in Hararge Area, eastern Ethiopia, Int. J. Sci. Tech. Soc., 5, 67–73, https://doi.org/10.11648/j.ijsts.20170504.13, 2017. 2. Ahmed, S. A., Chala, D., Kufa, C. A., Atickem, A., Bekele, A., Svenning, J. C., and Zinner, D.: Distribution and extent of suitable habitat for geladas (Theropithecus gelada) in the Anthropocene. bioRxiv, 2023.2008.2010.552774, https://doi.org/10.1101/2023.08.10.552774, 2023. 3. Akaike, H.: Information theory as an extension of the maximum likelihood principle, in Proceedings of the Second International Symposium on Information Theory, edited by: Petrov, B. N. and Csaki, F., Akademiai Kiado, Budapest, Hungaria, 267–281, 1973. 4. Anderson, J., Rowcliffe, J. M., and Cowlishaw, G.: The Angola black-and-white colobus (Colobus angolensis palliatus) in Kenya: Historical range contraction and current conservation status, Am. J. Primatol., 69, 664–680, https://doi.org/10.1002/ajp.20377, 2007. 5. Araldi, A., Barelli, C., Hodges, K., and Rovero, F.: Density estimation of the endangered Udzungwa red colobus (Procolobus gordonorum) and other arboreal primates in the Udzungwa Mountains using systematic distance sampling, Int. J. Primatol., 35, 941–956, https://doi.org/10.1007/s10764-014-9772-6 , 2014.
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