Assessing the Impact of Development Projects on Wildlife Abundance in Campo-Ma’an National Park, Southern Cameroon, from 2008 to 2020

Authors

  • Gareth Martinien Zo'obo Engolo

    1. Department of Industrial Quality-Hygiene-Safety-Environment Engineering, National Higher Polytechnic School of Douala, University of Douala, Douala P.O.Box 2701, Cameroon; 2. Laboratory of Methods, University of Douala, Douala P.O.Box 2701, Cameroon

  • Bassirou Yaouba

    1. Laboratory of Methods, University of Douala, Douala P.O.Box 2701, Cameroon; 2. Department of Rural Engineering, National Advanced School of Public Works, Yaounde P.O.Box 510, Cameroon

  • Severin Mbog Mbog

    1. Department of Industrial Quality-Hygiene-Safety-Environment Engineering, National Higher Polytechnic School of Douala, University of Douala, Douala P.O.Box 2701, Cameroon; 2. Laboratory of Methods, University of Douala, Douala P.O.Box 2701, Cameroon

  • Patrice Polmbaye Ngoko

    1. Department of Industrial Quality-Hygiene-Safety-Environment Engineering, National Higher Polytechnic School of Douala, University of Douala, Douala P.O.Box 2701, Cameroon; 2. Laboratory of Methods, University of Douala, Douala P.O.Box 2701, Cameroon

  • Charles Innocent Memvi Abessolo

    Campo-Ma'an National Park, Campo P.O.Box 19, Cameroon

  • Dieudonne Bitondo

    1. Department of Industrial Quality-Hygiene-Safety-Environment Engineering, National Higher Polytechnic School of Douala, University of Douala, Douala P.O.Box 2701, Cameroon; 2. Laboratory of Methods, University of Douala, Douala P.O.Box 2701, Cameroon

DOI:

https://doi.org/10.30564/jees.v7i9.10974
Received: 9 July 2025 | Revised: 18 August 2025 | Accepted: 25 August 2025 | Published Online: 24 September 2025

Abstract

The concentration of development projects near protected areas can undermine their conservation objectives. This study examines the impact of such projects on wildlife abundance in Campo-Ma'an National Park (CMNP). Information from the CMNP Conservation Department was analysed to investigate the link between development projects around the park and changes in wildlife populations, and analysis was conducted using statistical tools, including Excel 2020 and SPSS. Pearson's correlation coefficient was employed to assess the relationship between wildlife abundance indicators and the number of development projects surrounding the park. The findings reveal a significant decline in the abundance of key species, including elephants, great apes (such as gorillas and chimpanzees), and mandrills, over the past decade. Although a brief period of improvement was observed in the early 2010s, these gains were quickly reversed. Overall, the pattern shows that as development activities increased, wildlife numbers tended to decrease. These results underscore the urgent need for stricter regulation of development near the park and for comprehensive environmental and social impact assessments to be conducted before projects commencement. This process must receive greater attention from authorities and stakeholders to regulate activities around national parks and foster conservation efforts. Strengthening this oversight will help to maintain the park's ecological integrity and promote sustainable conservation.

Keywords:

Protected Area; Impact Assessment; Wildlife Abundance Indicators; Accumulation of Development Projects; Pearson Correlation

References

[1] Solly, B., El Hadji, B.D., Oumar, S., 2018. Monitoring Deforestation by High-Resolution Remote Sensing in the Department of Médina Yoro Foulah (Haute-Casamance, Senegal). Journal International des Sciences et Techniques de l’Eau et de l’Environnement. 3(2), 38–41. (in French)

[2] Food and Agriculture Organization (FAO), 2020. Global Forest Resources Assessment 2020. Food and Agriculture Organization (FAO): Rome, Italy. DOI: https://doi.org/10.4060/ca8753fr (in French)

[3] Munyemba, K.F., Bogaert, J., 2014. Anthropization and Spatiotemporal Dynamics of Land Use in the Lubumbashi Region Between 1956 and 2009. Revue Électronique de l’Université de Lubumbashi. 1, 3–23. (in French)

[4] Salomon, W., Sikuzani, Y.U., Kouakou, A.T.M., et al., 2021. Landscape Dynamics of the National Natural Park of the Pine Forest in Haiti (1973–2018). Tropicultura. 39(2), 2. DOI: https://doi.org/10.25518/2295-8010.1831 (in French)

[5] Salomon, W., Useni, Y., Tamia, A., et al., 2021. Monitoring of Anthropogenic Effects on Forest Ecosystems Within the Municipality of Vallières in the Republic of Haiti From 1984 to 2019. Trees, Forests and People. 6, 100135. DOI: https://doi.org/10.1016/j.tfp.2021.100135

[6] Soutullo, A., Machado-Gaye, A.L., Juri, E., 2022. Managing Cumulative Impacts and Protected Areas in Antarctica: What Can We Learn From the Rest of the World? Polar Research. 41, 1–5. DOI: https://doi.org/10.33265/polar.v41.8432

[7] Mitani, J.C., Abwe, E., Campbell, G., et al., 2023. Future Coexistence With Great Apes Will Require Major Changes to Policy and Practice. Nature Human Behaviour. 8, 632–643. DOI: https://doi.org/10.1038/s41562-024-01830-x

[8] Sıkdokur, E., Naderi, M., Çeltik, E., et al., 2024. Human-Brown Bear Conflicts in Türkiye Are Driven by Increased Human Presence Around Protected Areas. Ecological Informatics. 81, 102643. DOI: https://doi.org/10.1016/j.ecoinf.2024.102643

[9] Elzinga, C.L., Salzer, D.W., Willoughby, J.W., 2002. Monitoring Plant and Animal Populations. Pacific Conservation Biology. 8(3), 219. DOI: https://doi.org/10.1071/pc020219

[10] Constant, R., Sani, S., Ntoupka, M., et al., 2013. Attempt to Analyze the Peasant Conception of the Evolution, Management and Usefulness of the Mozogo-Gokoro National Park (Cameroon) With a View to Its Development. International Journal of Biological and Chemical Sciences. 7(6), 2490–2503. DOI: https://doi.org/10.4314/ijbcs.v7i6.24 (in French)

[11] Decoville, A., Feltgen, V., 2016. Indicators Relating to the Actions of Natural Parks. Luxembourg Institute of Socio-Economic Research (LISER): Esch-sur-Alzette, Luxembourg. DOI: https://doi.org/10.13140/RG.2.2.22125.79846 (in French)

[12] Jiao, W., Liu, X., He, S., 2022. Establishing an Ecological Monitoring System for National Parks in China: A Theoretical Framework. Ecological Indicators. 143, 109414. DOI: https://doi.org/10.1016/j.ecolind.2022.109414

[13] Dennis, E.B., Brereton, T.M., Morgan, B.J.T., et al., 2019. Trends and Indicators for Quantifying Moth Abundance and Occupancy in Scotland. Journal of Insect Conservation. 23, 369–380. DOI: https://doi.org/10.1007/s10841-019-00135-z

[14] Young, H.S., Mccauley, D.J., Galetti, M., et al., 2016. Patterns, Causes, and Consequences of Anthropocene Defaunation. Annual Review of Ecology, Evolution, and Systematics. 47, 333–358. DOI: https://doi.org/10.1146/annurev-ecolsys-112414-054142

[15] Jones, K.R., Venter, O., Fuller, R.A., et al., 2018. One-Third of Global Protected Land Is Under Intense Human Pressure. Science. 360, 6390. DOI: https://doi.org/10.1126/science.aap9565

[16] Newbold, T., Hudson, L.N., Hill, S.L.L., et al., 2015. Global Effects of Land Use on Local Terrestrial Biodiversity. Nature. 520, 45–50. DOI: https://doi.org/10.1038/nature14324

[17] Ndjeudja, R.J., 2023. Camvert Is a Bad Model for Development Projects That Cameroon Must Stop. Available from: https://www.greenpeace.org/africa/fr/publications-fr/13301/camvert-ou-le-mauvais-modele-de-projets-de-developpement-que-le-cameroun-doit-stopper/ (cited 18 September 2023). (in French)

[18] Greenpeace Africa, 2023. Greenpeace Africa Urges Halcyon Agri to Stop the Destruction of Community Livelihoods and Biodiversity in Cameroon. Available from: https://www.greenpeace.org/africa/fr/communiques-de-presse/693/greenpeace-africa-exhorte-halcyon-agri-a-stopper-la-destruction-des-moyens-de-subsistance-des-communautes-et-la-biodiversite-au-cameroun/ (cited 18 September 2023). (in French)

[19] Memvi, A.C.I., 2023. 2022 Annual Activity Report Programme 056. Campo-Ma’an National Park Conservation Service: Campo, Cameroon. (in French)

[20] Preatoni, D.G., Tattoni, C., Bisi, F., et al., 2012. Open Source Evaluation of Kilometric Indexes of Abundance. Ecological Informatics. 7(1), 35–40. DOI: https://doi.org/10.1016/j.ecoinf.2011.07.002

[21] Gedda, M., 2015.French Translation of the PRISMA Guidelines for Writing and Reading Systematic Reviews and Meta-Analyses. Kinésithérapie, la Revue. 15(157), 39–44. DOI: https://doi.org/10.1016/j.kine.2014.11.004 (in French)

[22] Ministry of Forests and Wildlife [MINFOF], 2020. Decree No. 0053/MINFOF of 1 April 2020 Establishing the Terms and Conditions for Classifying Animal Species Into Protection Categories. Ministry of Forests and Wildlife: Yaounde, Cameroon. (in French)

[23] Choumbou, B., 2020. Population Dynamics of Large and Medium-Sized Mammals in the Permanent Forest Area of the Campo Ma'an Technical Operational Unit – Technical Report. Campo-Ma’an National Park Conservation Service: Campo, Cameroon (in French)

[24] Etoga, G., Foguekem, D., 2008. Study of the Potential for Wildlife in Campo Ma'an National Park: The Status of Large Mammals and Anthropogenic Threats – Technical Report. Campo-Ma’an National Park Conservation Service: Campo, Cameroon. (in French)

[25] Etoga, G., Fondja, H.C., 2011. Assessment of wildlife potential in Campo Ma'an National Park: Status of Large Mammals and Anthropogenic Threats. Campo-Ma’an National Park Conservation Service: Campo, Cameroon. (in French)

[26] Ministry of the Environment and Forestry [MINEF], 2002. Campo-Ma'an Biodiversity Conservation and Development Project: Half-Yearly Report: July–December 2001 – Technical report. Ministry of the Environment and Forestry: Yaounde, Cameroon. (in French)

[27] Ministry of the Environment and Forestry [MINEF], Tropical International, S.N.V., 2002. Master Plan for the Development of the Campo-Ma'an Technical Operational Unit: Campo-Ma'an Biodiversity Management and Conservation Project – Technical Report. Ministry of the Environment and Forestry: Yaounde, Cameroon. (in French)

[28] Ministry of Forests and Wildlife [MINFOF], 2014. Development Plan for Campo-Ma'an National Park and its Peripheral Zone for the period 2015–2019 – Technical Report. Ministry of Forests and Wildlife: Yaounde, Cameroon. (in French)

[29] Dongmo, Z.N., Goran, K.P.N., Fondja, C., et al., 2015. Assessment of the Dynamics of Large and Medium-sized Mammal Populations in the Permanent Forest Area of the Campo Ma'an Technical Operational Unit – Technical Report. Campo-Ma’an National Park Conservation Service: Campo, Cameroon. (in French)

[30] Ly, A., Marsman, M., Wagenmakers, E.J., 2018. Analytic Posteriors for Pearson’s Correlation Coefficient. Statistica Neerlandica. 72(1), 4–13. DOI: https://doi.org/10.1111/stan.12111

[31] Bassirou, Y., Martial, N.G., Theodore, L.D., et al., 2024. Effects of Climate Change on Cotton Production and Level of Adaptation by Producers and the Cameroon Cotton Development Company. International Journal of Climate Change: Impacts and Responses. 16(2), 27–64. DOI: https://doi.org/10.18848/1835-7156/CGP/v16i02/27-64

[32] Bitondo, D., 2017. Report: Review of Environmental and Social Impact Assessments (ESIAs) and Environmental and Social Management Plans (ESMPs) for Infrastructure, Extractive and Agro-Industrial Projects in the Campo Ma'an Technical Operational Unit. Ministry for the Environment, Nature Conservation and Sustainable Development: Yaounde, Cameroon. (in French)

[33] Campbell, G., 2024. Status of Apes: Impacts of Industrial Development Projects on Apes. In: Foundation, A. (ed.). Disease, Health and Ape Conservation. Cambridge University Press: Cambridge, UK. pp. 200–231. DOI: https://doi.org/10.1017/9781009071727.008

[34] Ashagrie, M., Jilo, K., Zelelew, S.A., 2024. Effects of Human Disturbance on the Distribution and Abundance of Large Mammals in Abijata-Shalla Lakes National Park, Ethiopia. Journal for Nature Conservation. 82, 126755. DOI: https://doi.org/10.1016/j.jnc.2024.126755

[35] Zisadza, J., Mrewa, A.T., Khosa, A., et al., 2025. Illegal Hunting and Bushmeat Trade Around Save Valley Conservancy. Environmental Management. 1–14. DOI: https://doi.org/10.1007/s00267-025-02136-y

[36] Castillo-Huitrón, N.M., Naranjo, E.J., Enríquez, P., et al., 2024. Feelings, Conflicts, and Use: Wildlife-Human Interactions in El Triunfo Biosphere Reserve, Mexico. Human Dimensions of Wildlife. 29(4), 416–431. DOI: https://doi.org/10.1080/10871209.2023.2263471

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How to Cite

Gareth Martinien Zo’obo Engolo, Bassirou Yaouba, Severin Mbog Mbog, Patrice Polmbaye Ngoko, Charles Innocent Memvi Abessolo, & Dieudonne Bitondo. (2025). Assessing the Impact of Development Projects on Wildlife Abundance in Campo-Ma’an National Park, Southern Cameroon, from 2008 to 2020. Journal of Environmental & Earth Sciences, 7(9), 106–123. https://doi.org/10.30564/jees.v7i9.10974

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