Abstract
Understanding the impact of hunting on wildlife is necessary to protect biodiversity in remote, endangered ecosystems, where rural communities depend on bushmeat as sources of food and income. Unsustainable hunting has led to a major decline in mammal population densities across Africa, especially for ungulates and primates. The objectives of this study were to (1) quantify the impact of hunting on lesula (Cercopithecus lomamiensis), a semiterrestrial and poorly known monkey in the Democratic Republic of the Congo, and (2) assess the species’ relative abundance in the context of its behavioral ecology and local hunting practices. We compared the relative abundance of lesula to prey species preferred by hunters using data collected from camera trap surveys (5,960 days) and primate vocalization surveys (n = 174) and assessed species-specific hunting pressure in the buffer zone using data collected from surveillance patrols (2,255 km), hunter follows (n = 16), and semistructured interviews (n = 21). We found that the abundance of terrestrial mammal and primate species was negatively impacted by hunting in the buffer zone, but the abundance of lesula appeared relatively similar throughout its range. Our results suggest that the relative tolerance of lesula in the buffer zone was associated with its ecological niche and the specific behavior of local hunters. Lesula is a threatened, endemic monkey of the Congo Basin rainforest, and this study provides data to enable its continuous monitoring and long-term population management. Some primate populations, such as lesula, may be able to persist under specific conditions despite being subject to high hunting pressure.
Abstract in French
Comprendre l'impact de la chasse sur la faune est nécessaire pour protéger la biodiversité dans les écosystèmes éloignés et menacés, où les communautés rurales dépendent de la viande de brousse comme source de nourriture et de revenus. La chasse non durable a entraîné une baisse importante des densités de population de mammifères à travers l'Afrique, en particulier pour les ongulés et les primates. Les objectifs de cette étude étaient (1) de quantifier l'impact de la chasse sur lesula (Cercopithecus lomamiensis), un singe semi-terrestre et mal connu en République Démocratique du Congo, et (2) d'évaluer l’abondance relative de cette population dans le contexte de son écologie comportementale et des pratiques de chasse locales. Nous avons comparé l'abondance relative de lesula aux espèces de gibiers préférées des chasseurs à l'aide de données recueillies à partir de pièges photographiques (5960 jours) et d'enquêtes sur la vocalisation des primates (n = 174) et avons évalué la pression de chasse dans la zone tampon à l'aide de données recueillies à partir de patrouilles de surveillance (2255 km), de suivis de chasseurs (n = 16) et d'entretiens semi-structurés (n = 21). Nous avons constaté que l'abondance des espèces de mammifères terrestres et singes étaient négativement affectée par la chasse dans la zone tampon mais que l'abondance de lesula semble être similaire dans toute son aire de distribution. Nos résultats suggèrent que la tolérance relative de lesula à la chasse dans la zone tampon était associée à sa niche écologique et au comportement spécifique des chasseurs locaux. Lesula est un singe menacé et endémique de la forêt tropicale du bassin du Congo, et cette étude fournit des données pour permettre la surveillance continue et la gestion à long terme de la population. Certaines populations de primates, telles que lesula, peuvent persister dans des conditions spécifiques malgré une forte pression de chasse. *The translated abstract was not copy-edited by Springer Nature.
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Data Availability
The datasets analysed during the current study are available from the corresponding author, Dr. Kate Detwiler, upon reasonable request.
References
Abernethy, K. A., Coad, L., Taylor, G., Lee, M. E., & Maisels, F. (2013). Extent and ecological consequences of hunting in Central African rainforests in the twenty-first century. In Philosophical Transactions of the Royal Society B: Biological Sciences (Vol. 368, Issue 1625). Royal Society of London. https://doi.org/10.1098/rstb.2012.0303
Alempijevic, D., Hart, J. A., Hart, T. B., & Detwiler, K. M. (2021). Using local knowledge and camera traps to investigate occurrence and habitat preference of an Endangered primate: the endemic dryas monkey in the Democratic Republic of the Congo. Oryx, 1–8. https://doi.org/10.1017/S0030605320000575
Alexander, R. D. (1974). The evolution of social behavior. Annual Review of Ecology and Systematics, 5, 325–383.
Arenson, J. L., Sargis, E. J., Hart, J. A., Hart, T. B., Detwiler, K. M., & Gilbert, C. C. (2020). Skeletal morphology of the lesula (Cercopithecus lomamiensis) and the evolution of guenon locomotor behavior. American Journal of Physical Anthropology. https://doi.org/10.1002/ajpa.24025
Astaras, C., Linder, J. M., Wrege, P., Orume, R. D., & Macdonald, D. W. (2017). Passive acoustic monitoring as a law enforcement tool for Afrotropical rainforests. Frontiers in Ecology and the Environment, 15(5), 233–234. https://doi.org/10.1002/fee.1495
Baker, L. R., & Olubode, O. S. (2007). Correlates with the distribution and abundance of endangered Sclater’s monkeys (Cercopithecus sclateri) in southern Nigeria. African Journal of Ecology, 46, 365–373.
Bettridge, C. M., & Dunbar, R. I. M. (2013). Predation as a determinant of minimum group size in Baboons. Folia Primatologica, 83(3–6), 332–352. https://doi.org/10.1159/000339808
Broseth, H., & Chr Pedersen, H. (2000). Hunting effort and game vulnerability studies on a small scale: A new technique combining radio-telemetry, GPS and GIS. Journal of Applied Ecology, 37(1), 182–190.
Che, N. B., Nkemnyi, M. F., Atem, E. T., & Giliba, R. (2017). The correlation between bushmeat harvesting and wildlife abundance in the Tofala-Mone Forest Corridor, Cameroon. International Journal of Conservation Science, 8(3), 465–474.
CITES. (2000). Bushmeat as a trade and wildlife management issue. Conference of the Parties Gigiri, 11th meeting, Kenya. Doc 11.4. Retrieved November 29, 2020 from https://ecohealth.net/wpcontent/uploads/2016/10/ECH_Author_Info-3.pdf
Coad, L.M. (2008). Bushmeat hunting in Gabon: socioeconomics and hunter behaviour. Doctoral dissertation. University of Cambridge.
Coad, L., Fa, J. E., Abernethy, K., Van Vliet, N., Santamaria, C., Wilkie, D., El Bizri, H. R., Ingram, D. J., Cawthorn, D.-M., & Nasi, R. (2019). Towards a sustainable, participatory and inclusive wild meat sector. CIFOR. https://doi.org/10.17528/cifor/007046
Cronin, D. T., Riaco, C., Linder, J. M., Bergl, R. A., Gonder, M. K., O’Connor, M. P., & Hearn, G. W. (2016). Impact of gun-hunting on monkey species and implications for primate conservation on Bioko Island, Equatorial Guinea. Biological Conservation, 197, 180–189. https://doi.org/10.1016/j.biocon.2016.03.001
Dehn, M. M. (1990). Vigilance for Predators: Detection and Dilution Effects. Behavioral Ecology and Sociobiology, 26(5), 337–342. https://www.jstor.org/stable/4600415
Detwiler, K. M., Nkoranigwa, M., Detwiler, C. K., & Whittier, C. A. (2019). Auto-amputation following acute traumatic forelimb injury in a wild Cercopithecus monkey. African Primates, 13, 39–46.
Detwiler, K. M. & Hart, J. A. (2020). Cercopithecus lomamiensis. The IUCN Red List of Threatened Species 2020:e.T92401376A92401776. Retrieved July 22, 2020 from https://doi.org/10.2305/IUCN.UK.2020-2.RLTS.T92401376A92401776.en
Diarrassouba, A., Gnagbo, A., CélestinKouakou, Y., Campbell, G., Tiedoué, M. R., Tondossama, A., Kühl, H. S., & Koné, I. (2020). Differential response of seven duiker species to human activities in Taï National Park, Côte d’Ivoire. African Journal of Ecology, 58(1), 58–68. https://doi.org/10.1111/aje.12680
Estrada, A., Garber, P. A., Mittermeier, R. A., Wich, S., Gouveia, S., Dobrovolski, R., Nekaris, K. A. I., Nijman, V., Rylands, A. B., Maisels, F., Williamson, E. A., Bicca-Marques, J., Fuentes, A., Jerusalinsky, L., Johnson, S., de Melo, F. R., Oliveira, L., Schwitzer, C., Roos, C., … Setiawan, A. (2018). Primates in peril: The significance of Brazil, Madagascar, Indonesia and the Democratic Republic of the Congo for global primate conservation. PeerJ, 6.https://doi.org/10.7717/peerj.4869.
Gandiwa, E., Heitkönig, I. M. A., Lokhorst, A. M., Prins, H. H. T., & Leeuwis, C. (2013). Illegal hunting and law enforcement during a period of economic decline in Zimbabwe: A case study of northern Gonarezhou National Park and adjacent areas. Journal for Nature Conservation, 21(3), 133–142. https://doi.org/10.1016/j.jnc.2012.11.009
Glenn, M. E. (1997). Group Size and Group Composition of the Mona Monkey (Cercopithecus mona) on the Island of Grenada, West Indies. American Journal of Primatology, 43, 167–173.
Gonedelé Bi, S., Bitty, E. A., Yao, A. K., & McGraw, W. S. (2019). Foot Patrols Enhance Conservation Efforts in Threatened Forest Reserves of Coastal Côte d’Ivoire. Tropical Conservation Science, 12. https://doi.org/10.1177/1940082919872637
Graefen, M. (2017). Village based hunter behavior in the Eastern Democratic Republic of Congo [Master’s Thesis]. Forest and Nature Conservation Policy Group.
Gregory, T., Lunde, D., Zamora-Meza, H. T., & Carrasco-Rueda, F. (2015). Records of Coendou ichillus (Rodentia, Erethizontidae) from the Lower Urubamba Region of Peru. ZooKeys, 2015(509), 109–121. https://doi.org/10.3897/zookeys.509.9821
Griffiths, B. M., Bowler, M., Kolowski, J., Stabach, J., Benson, E. L., & Gilmore, M. P. (2022). Revisiting Optimal Foraging Theory (OFT) in a Changing Amazon: Implications for Conservation and Management. Human Ecology. https://doi.org/10.1007/s10745-022-00320-w
Hart, J., & Hart, T. (2011). Breaking the bushmeat cycle in Congo: A good news story. Swara, 2011(1), 16–19.
Hart, J. A., Detwiler, K. M., Gilbert, C. C., Burrell, A. S., Fuller, J. L., Emetshu, M., Hart, T. B., Vosper, A., Sargis, E. J., & Tosi, A. J. (2012). Lesula: A New Species of Cercopithecus Monkey Endemic to the Democratic Republic of Congo and Implications for Conservation of Congo’s Central Basin. PLoS ONE, 7(9). https://doi.org/10.1371/journal.pone.0044271
Hart, T. B. (2016). Lomami National Park: A new protected area in D. R. Congo. Searching for Bonobo in Congo. Retrieved on June 20, 2020 from https://www.bonoboincongo.com/2016/07/13/lomami-national-park-a-new-protected-area-in-d-r-congo/
Herrmann, N. C., Stroud, J. T., & Losos, J. B. (2021). The Evolution of ‘Ecological Release’ into the 21st Century. In Trends in Ecology and Evolution (Vol. 36, Issue 3, pp. 206–215). Elsevier Ltd. https://doi.org/10.1016/j.tree.2020.10.019
Holt, R. D., & Bonsall, M. B. (2017). Annual Review of Ecology. Evolution, and Systematics Apparent Competition. https://doi.org/10.1146/annurev-ecolsys-110316
Kingdon, J. (2020). The Kingdon pocket guide to African mammals (2nd ed.). Princeton University Press.
Kümpel, N. F. (2006). Incentives for sustainable hunting of bushmeat in Río Muni. Zoological Society of London.
Kümpel, N. F., Milner-Gulland, E. J., Cowlishaw, G., & Rowcliffe, J. M. (2010). Incentives for hunting: The role of bushmeat in the household economy in rural Equatorial Guinea. Human Ecology, 38(2), 251–264. https://doi.org/10.1007/s10745-010-9316-4
Kümpel, N. F., Milner-Gulland, E. J., Rowcliffe, J. M., & Cowlishaw, G. (2008). Impact of gun-hunting on diurnal primates in continental Equatorial Guinea. International Journal of Primatology, 29(4), 1065–1082. https://doi.org/10.1007/s10764-008-9254-9
Linder, J. M., & Oates, J. F. (2011). Differential impact of bushmeat hunting on monkey species and implications for primate conservation in Korup National Park, Cameroon. Biological Conservation, 144(2), 738–745. https://doi.org/10.1016/j.biocon.2010.10.023
Magnuson, L. (2005). Conservation of African monkeys. International Journal of Primatology, 26(3), 511–513. https://doi.org/10.1007/s10764-005-4362-2
Mbete, R. A., Banga-Mboko, H., Racey, P., Mfoukou-Ntsakala, A., Nganga, I., Vermeulen, C., Doucet, J. L., Hornick, J. L., & Leroy, P. (2011). Household bushmeat consumption in Brazzaville, the Republic of the Congo. Tropical Conservation Science, 4(2), 187–202. https://doi.org/10.1177/194008291100400207
Mcphee, S. G. (2015). A camera trap study of the cryptic, terrestrial guenon Cercopithecus lomamiensis in Central Democratic Republic of the Congo [Master’s Thesis]. Florida Atlantic University.
Mockrin, M. H. (2009). Duiker demography and dispersal under hunting in Northern Congo. African Journal of Ecology, 48, 239–247.
Mogomotsi, P. K., Mogomotsi, G. E. J., Dipogiso, K., Phonchi-Tshekiso, N. D., Stone, L. S., & Badimo, D. (2020). An Analysis of Communities’ Attitudes Toward Wildlife and Implications for Wildlife Sustainability. Tropical Conservation Science, 13.https://doi.org/10.1177/1940082920915603
Ouattara, K., Lemasson, A., & Zuberbühler, K. (2009). Anti-predator strategies of free-ranging Campbell’s monkeys. Behaviour, 146(12), 1687–1708. https://doi.org/10.1163/000579509X12469533725585
Peres, C. A., & Dolman, P. M. (2000). Density compensation in neotropic primate communities: Evidence from 56 hunted and nonhunted Amazonian forests of varying productivity. Oecologia, 122, 175–189.
Perry, G. H., & Verdu, P. (2017). Genomic perspectives on the history and evolutionary ecology of tropical rainforest occupation by humans. Quaternary International, 448, 150–157. https://doi.org/10.1016/j.quaint.2016.04.038
Pyke, G. H., Pulliam, H. R., & Charnov, E. L. (1977). Optimal foraging: A selective review of theory and tests. The Quarterly Review of Biology, 52(2), 137–154.
Rist, J., Milner-Gulland, E. J., Cowlishaw, G., & Rowcliffe, J. M. (2009). The Importance of Hunting and Habitat in Determining the Abundance of Tropical Forest Species in Equatorial Guinea. Biotropica, 41(6), 700–710. https://doi.org/10.1111/j.1744-7429.2009.00527.x
Rist, J., Rowcliffe, M., Cowlishaw, G., & Milner-Gulland, E. J. (2008). Evaluating measures of hunting effort in a bushmeat system. Biological Conservation, 141(8), 2086–2099. https://doi.org/10.1016/j.biocon.2008.06.005
Rowcliffe, J. M., de Merode, E., & Cowlishaw, G. (2004). Do wildlife laws work? Species protection and the application of a prey choice model to poaching decisions. Proceedings of the Royal Society b: Biological Sciences, 271, 2631–2636. https://doi.org/10.1098/rspb.2004.2915
Tagg, N., Kuenbou, J. K., Laméris, D. W., Meigang, F. M. K., Kekeunou, S., Epanda, M. A., Dupain, J., Mbohli, D., Redmond, I., & Willie, J. (2020). Long-term trends in wildlife community structure and functional diversity in a village hunting zone in southeast Cameroon. Biodiversity and Conservation, 29(2), 571–590. https://doi.org/10.1007/s10531-019-01899-1
Tutin, C. E. G. & White, L. (1999). The recent evolutionary past of primate communities, likely environmental impacts during the past three millennia. In Fleagle, J. G., Janson, C. H., & Reed, K. E. (Eds.) Primate Communities (pp 220–236). Cambridge University Press.
Van Schaik, C. P. (1983). Why are diurnal primates living in groups? Behaviour, 87, 120–144.
Waltert, M., Lien, Faber, K., & Mühlenberg, M. (2002). Further declines of threatened primates in the Korup Project Area, south-west Cameroon. Oryx, 36(3), 257–265. https://doi.org/10.1017/S0030605302000479
Wimberger, K., LaRocque, R., Rudran, R., Deogratias, T., & Kaplin, B. (2021). Cercopithecus mitis. © All the World's Primates. In N. Rowe, M. Myers (eds.) Retrieved March 17, 2021 from www.alltheworldsprimates.org
Wrangham, R. W., Gittleman, J. L., & Chapman, C. A. (1993). Constraints on group size in primates and carnivores: Population density and day-range as assays of exploitation competition. Behavioral Ecology and Sociobiology, 32(3), 199–209. https://doi.org/10.1007/BF00173778
Ziegler, S., Fa, J. E., Wohlfart, C., Streit, B., Jacob, S., & Wegmann, M. (2016). Mapping Bushmeat Hunting Pressure in Central Africa. Biotropica, 48(3), 405–412. https://doi.org/10.1111/btp.12286
Acknowledgements
We dedicate this manuscript to Pablo Ayali (1981-2018) for his commitment to the Lesula monkey project and the conservation of the Lomami National Park. This research is authorized by the collaboration agreement between ICCN and FZS. Our sincere thanks go to all village level authorities and hunters who were willing to participate in the study. We thank the FAU Primatology Lab members: Daniel Alempijevic, Aaron Mencia, and all members of the camera trap team (FAU undergraduate students and volunteers). We are also grateful for all the field assistants and field researchers throughout the years. We thank Dr. Michael J. Lawes for helpful comments on an earlier draft. We thank Professor Jo Setchell and two anonymous reviewers for their comments and feedback on the manuscript.
Field work was funded by Lukuru Wildlife Research Foundation, Frankfurt Zoological Society, Primate Conservation Inc., Idea Wild, FAU Anthropology Department, and Indiegogo Crowdfunding.
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Fournier, C.S., Graefen, M., McPhee, S. et al. Impact of Hunting on the Lesula Monkey (Cercopithecus lomamiensis) in the Lomami River Basin, Democratic Republic of the Congo. Int J Primatol 44, 282–306 (2023). https://doi.org/10.1007/s10764-022-00337-4
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DOI: https://doi.org/10.1007/s10764-022-00337-4