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Biodiversity & Conservation

, Volume 10, Issue 1, pp 99–118 | Cite as

Bushmeat hunting and management: implications of duiker ecology and interspecific competition

  • Helen Newing
Article

Abstract

Duikers Cephalophus spp. are an important source of food and income throughout the forest regions of Central and West Africa, and current levels of hunting are probably unsustainable, at least near large settlements. The direct effects of hunting consist of two main aspects: overexploitation of target species, and incidental hunting of non-targeted or rare species because hunting is largely non-selective. There are many methodological and practical problems to a technical approach to overexploitation, and there are increasing calls for alternative measures such as zoning and enforcement of exclusive local resource rights. There is also increasing recognition of the need to ensure that hunting is more selective. This paper reviews current knowledge of duiker ecology and niche separation in order to assess likely indirect effects of these measures on different species. The main factor separating fundamental niches of sympatric species is body size, which limits dietary choice. Additional descriptive factors include anatomical features – particularly the jaw musculature and size of mouth and neck; activity patterns and habitat preferences within closed canopy forest. However, there is wide overlap of diets and broad tolerance of habitat disturbance by most species, and therefore niche overlap and interspecific competition may be high. In the Upper Guinean forest in West Africa, but not in Central Africa, differential use of closed canopy forest and secondary vegetation also appears to be an important factor in niche separation; three pairs of species seem to be separated primarily by this factor. Distributional variations in habitat use suggest that at least in the case of the yellow-backed duiker and the endangered Jentink's duiker, the separation is due to competition rather than to fundamental niche constraints. Selective hunting or zoning will thus have indirect effects on non-targeted species through changes in competitive dominance in different habitats.

bushmeat Cephalophus duiker frugivores hunting 

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References

  1. Bowen-Jones E andPendry S (1999) The threat to primates and other mammals from the bushmeat trade in Africa, and how this threat could be diminished. Oryx 33(3): 233–246Google Scholar
  2. Cantrell RS,Cosner C andFagan WF (1998) Competitive reversals inside ecological reserves: the role of external habitat degradation. Journal of Mathematical Biology 37(6): 491–533Google Scholar
  3. Davies AG (1987) The Gola Forest Reserves, Sierra Leone: Wildlife Conservation and Forest Management. IUCN/Cambridge University Press, CambridgeGoogle Scholar
  4. Davies AG andBirkenhager B (1990) Jentink' duiker in Sierra Leone: evidence from the Freetown Peninsula. Oryx 24(3): 143–146Google Scholar
  5. Davies AG, Heydon M, Leader-Williams N, MacKinnon J and Newing H (in press) Large terrestrial mammals and logging. In: Fimbel R, Grajal A and Robinson J (eds) Wildlife-Logging Interactions in Tropical Forests, Ch. 6. Columbia University Press, New YorkGoogle Scholar
  6. Delaney MJ (1982) Mammal Ecology. Blackie & Son, GlasgowGoogle Scholar
  7. Dubost G (1978)Un apercu sur l'écologie du chevrotain africain Hyemoschus aquaticus Ogilbyi, artiodactyle tragulidé. Mammalia 42(1): 1–62Google Scholar
  8. Dubost G (1980),L'écologie et la vie sociale du céphalophe bleu (Cephalophus monticola), petit ruminant forestier africain. Zeitschrift für Tierpsychologie 54: 205–266Google Scholar
  9. Dubost G (1984) Comparison of the diets of frugivorous ruminants of Gabon. Journal of Mammalogy 65(2): 298–316Google Scholar
  10. Feer F (1988) Strategies écologiques de deux éspèces de bovidés sympatriques de la forêt sempervirente africaine (Cephalophus callipygus et C. dorsalis): Influence du rythme d'activité. DSc thesis, Université Pierre et Marie Curie, ParisGoogle Scholar
  11. Feer F (1989a)Occupation de l'éspace par deux bovidés sympatriques de la forêt dense africaine (Cephalophus callipygus et C. dorsalis): Influence du rythme d'activité. Revue d'Ecologie (Terre et Vie) 44: 225–248Google Scholar
  12. Feer F (1989b)Comparaison des regimes alimentaires de Cephalophus callipygus et C. dorsalis, bovidés sympatriques de la forêt sempervirente africaine. Mammalia 53(4): 563–604Google Scholar
  13. Feer F (1993) The potential for sustainable hunting and rearing of game in tropical forests. In: Hladik CM,Hladik A,Linares OF,Pagezy H,Semple A andHadley M (eds) Tropical Forests, People and Food: Biocultural Interactions and Applications to Development, Ch. 59. MAB Series Vol. 13, UNESCO, ParisGoogle Scholar
  14. Fleming TH (1979)Do tropical frugivores compete for food? American Zoologist 19: 1157–1172Google Scholar
  15. Gautier-Hion A andGautier A (1994) Cephalophus ogilbyi crusalbum Grubb 1978, described from coastal Gabon, is quite common in the Foret des Abeilles, central Gabon. Revue d'Ecologie (Terre et Vie) 49: 177–180Google Scholar
  16. Gautier-Hion A,Duplantier J-M,Quris R,Feer F,Sourd C,Decoux J-P,Dubost G,Emmons L,Erard C,Hecketsweiler P,Moungazi A,Roussilhon C andThiollay J-M (1985) Fruit characters as a basis of fruit choice and seed dispersal in a tropical forest vertebrate community. Oecologia 65: 324–337Google Scholar
  17. Gle D (1993) Méthodes d'estimation des densités de populations animales appliquées aux céphalophes du Parc National de Taï. DEA thesis, Université National de Côte d'Ivoire, AbidjanGoogle Scholar
  18. Hart J (1985) Comparative dietary ecology of a community of frugivorous forest ungulates in Zaïre. D. Phil, Dept of Fisheries and Wildlife, MichiganGoogle Scholar
  19. Hofmann RR (1973) The Ruminant Stomach. East African Monographs in Biology 2Google Scholar
  20. Illius AW andGordon IJ (1992) Modelling the nutritional ecology of ungulate herbivores-evolution of body size and competitive interactions. Oecologia 89(3): 428–434Google Scholar
  21. Johns A (1983) Tropical forest primates and logging-can they coexist? Oryx 17(3): 114–118Google Scholar
  22. Johns A (1988) Effects of 'selective' timber extraction on rain forest structure and composition and some consequences for frugivores and folivores. Biotropica 20(1): 31–37Google Scholar
  23. Jori F,Lopez Bejar M andHouben P (1998) The biology and use of the African brush-tailed porcupine (Atherurus africanus, Gray, 1842) as a food animal. A review. Biodiversity and Conservation 7(11): 1417–1426Google Scholar
  24. Juste J,Fa JE,Perez del Val J andCastroviejo J (1995) Market dynamics of bushmeat species in Equatorial Guinea. Journal of Applied Ecology 32: 454–467Google Scholar
  25. Kuhn H (1968) Der Jentink-Ducker. Natur und Museum 98(1): 17–23Google Scholar
  26. Lahm SA (1991) Impact of human activity on antelope populations in Gabon. ASG Gnusletter IUCN 10(1): 7–8Google Scholar
  27. Lahm S (1993) Utilisation of forest resources and local variation of wildlife populations in northeastern Gabon. In: Hladik CM,Hladik A,Linares OF,Pagezy H,Semple A andHadley M (eds) Tropical Forests, People and Food: Biocultural Interactions and Applications to Development. MAB Series Vol. 13, UNESCO, ParisGoogle Scholar
  28. Malbrant R andQuijoux P (1958)Présence du Céphalophe a dos jaune Cephalophus sylvicultor (Afzelius) au Tchad. Mammalia 22: 591–592Google Scholar
  29. Muchaal PK andNgandjui G (1999) Impact of village hunting on wildlife populations in the western Dja Reserve, Cameroon. Conservation Biology 13(2): 385–396Google Scholar
  30. Newing HS (1994) Behavioural ecology of duikers (Cephalophus spp.) in forest and secondary growth, Taï, Côte d'Ivoire. PhD thesis, Stirling University, ScotlandGoogle Scholar
  31. Noss AJ (1998a) The Impacts of Cable Snare Hunting onWildlife Populations in the Forests of the Central African Republic. Conservation Biology 12(2): 390–398Google Scholar
  32. Noss AJ (1998b) The impacts of BaAka net hunting on rainforest wildlife. Biological Conservation 86: 161–167Google Scholar
  33. Noss AJ (1999) Censusing rainforest game species with communal net hunts. African Journal of Ecology 37: 1–11Google Scholar
  34. Wilkie DS (1987) Impact of Swidden Agriculture and subsistence hunting on diversity and abundance of exploited fauna in the Ituri forest of northeastern Zaïre. D. Phil, Dept of Forestry Management, MassachussettsGoogle Scholar
  35. Wilkie DS andCarpenter JF (1999) Bushmeat hunting in the Congo Basin: an assessment of impacts and options for mitigation. Biodiversity and Conservation 8(7): 927–955Google Scholar
  36. Wilkie DS andFinn JT (1990) Slash-burn cultivation and mammal abundance in the Ituri forest, Zaïre. Biotropica 22(1): 90–99Google Scholar
  37. Wilson VJ (1987) Action Plan for Duiker Conservation. IUCN, GlandGoogle Scholar

Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Helen Newing
    • 1
  1. 1.Durrell Institute of Conservation Ecology (DICE)University of Kent at CanterburyCanterburyUK

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