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A structural analysis of rain forest at Korup and Douala–Edea, Cameroon

Published online by Cambridge University Press:  05 December 2011

D. McC. Newbery  and
J. S. Gartlan
D. McC. Newbery
Affiliation:
Department of Biological & Molecular Sciences, University of Stirling, Stirling FK9 4LA, Scotland, UK
J. S. Gartlan
Affiliation:
WWF Cameroon, B.P. 6776 Yaoundé, Cameroon
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Synopsis

Diameter frequency distributions (dfds) of 197 tree species in Korup National Park and 118 tree species in Douala–Edea Forest Reserve (based on c. 41 000 and 25 000 trees ≥ 30 cm gbh in 135 and 104 plots along four transects at each site, respectively) were individually classified into four groups of species according to their maximum diameters (≥99% trees <50, <70 and <90cm dbh, and > 1% ≥90cm dbh), and separated into two abundance classes (n≥50 and n = 20–49 (or 15–49). A fifth group, from those species in 3 and 4, was defined by a relative lack of small stems and given detailed attention. Dfds were evaluated for all species together on a transect and site basis, and compared for individual species across transects, and between sites for those group 5 species in common.

Analysis focussed on three large ectomycorrhizal species in groups 3 and 4, Microberlinia bisulcata, Tetraberlinia bifoliolata and T. moreliana (Caesalpiniaceae), which were restricted to, and dominated, the forest on the nutrient-poor soils of transect P at Korup. M. bisulcata, the most abundant, was markedly group 5 in character, with very few small trees, whilst the Tetraberlinia species had strong replacement potential. Although there were 27 species (42% of groups 3 & 4) at Korup and 19 (48%) at Douala–Edea in group 5, M. bisulcata was unique in its combination of large size, dfd, mycorrhizal habit, spatial distribution and soil association. The potential replacement of this species was contrasted also with a non-ectomycorrhizal caesalp with similar dfd that occurred on nutrient-richer soils, Erythrophleum ivorense.

Knowledge of the Caesalpiniaceae-rich la forêt biafriéene of Letouzey (which includes Korup and Douala–Edea) is reviewed, and the distribution, ecology and regeneration of the caesalps discussed. Structure and inferred dynamics of the forest at Korup are discussed with special regard to the ectomycorrhizal species.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 104: Essays on the Ecology of the Guinea-Congo Rain Forest , 1996 , pp. 177 - 224
Copyright
Copyright © Royal Society of Edinburgh 1996

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References

Alexander, I. J. 1989a. Mycorrhizas in tropical forests. In Proctor, J. (Ed.), Mineral nutrients in tropical forests and savanna ecosystems, pp. 169–88. Oxford: Blackwell Scientific Publications.Google Scholar
Alexander, I. J. 1989b. Systematics and ecology of ectomycorrhizal legumes. In Stirton, C. H. & Zarucchi, J. L. (Eds) Advances in legume biology, pp. 607–24.Google Scholar
Aubréville, A. 1938. La forêt coloniale: Les forêts de l'Afrique Occidentale Française. Paris: Société d'Editions Géographiques, Maritimes et Coloniales.Google Scholar
Aubréville, A. 1968. Les Caesalpinioidées de la flora Camerouno-Congolaise. Adansonia série 2 8, 147–75.Google Scholar
Aubréville, A. 1970. Légumineuses (Césalpinioidées). Paris: Muséum National D'Histoire Naturelle.Google Scholar
Connell, J. H. & Lowman, M. D. 1989. Low-diversity tropical rain forests: some possible mechanisms for their existence. American Naturalist 134, 88–119.Google Scholar
Devred, R. 1958. La végétation forestière du Congo belge et du Ruanda-Urundi. Bulletin de la Société Royale Forestière de Belgique 65, 409–68.Google Scholar
Gartlan, J. S. 1986. The biological and historical importance of the Korup forest. In Gartlan, J. S. & Macleod, H. (Eds) Workshop on Korup National Park, pp. 28–35. Mundemba, Cameroon: WWF/IUCN Project 3206.Google Scholar
Gartlan, J. S. 1992. Cameroon. In Sayer, J. A., Harcourt, C. S. & Collins, N. M. (Eds) The conservation atlas of tropical forests: Africa, pp. 110–18. IUCN.Google Scholar
Gartlan, J. S., Newbery, D. McC., Thomas, D. W. & Waterman, P. G. 1986. The influence of topography and soil phosphorus on the vegetation of Korup Forest Reserve, Cameroon. Vegetatio 65, 131–48.CrossRefGoogle Scholar
Gérard, P. 1960. Etude écologique de la forêt dense à Gilbertiodendron dewevrei dans la région de l'Uele. Publications de l'Institut National pour l'Etude Agronomique du Congo; Série scientifique, No. 87, 1–159.Google Scholar
Germain, R. & Evrard, C. 1956. Etude écologique et phytosociologique de la forêt à Brachystegia laurentii. Publications de l'Institut National pour l'Etude Agronomique du Congo Beige, No. 67, 1–105.Google Scholar
Gloriod, G. 1974. La forêt de l'Est du Gabon. Revue Bois et Forêt des Tropiques, No. 155, 35–57.Google Scholar
Hall, J. B. 1977. Forest-types in Nigeria: an analysis of pre-exploitation forest enumeration data. Journal of Ecology 65, 187–99.CrossRefGoogle Scholar
Hall, J. B. 1981. Ecological islands in south-eastern Nigeria. African Journal of Ecology 19, 55–72.Google Scholar
Hamilton, A. 1976. The significance of patterns of distribution shown by forest plants and animals in tropical Africa for the reconstruction of Upper Pleistocene paleoenvironments: a review. In Bakker, E. M. Z. (Ed.) Paleoecology of Africa, pp. 63–97. Cape Town: Balkema.Google Scholar
Hamilton, A. 1989. African forests. In Leith, H. & Werger, M. J. A. (Eds) Tropical rain forest ecosystems: biogeographical and ecosystem studies, pp. 155–82. Amsterdam: Elsevier.CrossRefGoogle Scholar
Hamilton, A. 1992. History of forests and climate. In Sayer, J., Harcourt, C. S. & Collins, N. M. (Eds) The conservation atlas of tropical forests: Africa, pp. 17–25. IUCN.Google Scholar
Hart, T. B., Hart, J. A. & Murphy, P. G. 1989. Monodominant and species-rich forests of the humid tropics: causes for their co-occurrence. American Naturalist 133, 613–33.Google Scholar
Högberg, P. 1986. Soil nutrient availability, root symbioses and tree species composition in tropical Africa: a review. Journal of Tropical Ecology 2, 359–72.Google Scholar
Hutchinson, J. & Dalziel, J. M. 1958. Flora of West Tropical Africa (2nd edn). Volume I. London: Crown Agents.Google Scholar
Hutchinson, J. & Dalziel, J. M. 1963. Flora of Tropical West Africa (2nd edn). Volume II. London: Crown Agents.Google Scholar
Jentsch, . 1911. Der Urwald Kameruns. In Warburg, O. & Wohltmann, F. (Eds) Beihefte zum Tropenpflanzen, pp. 1–199. Berlin: Kolonial Wirtschaftliches Komitee.Google Scholar
Jones, E. W. 1955. Ecological studies on the rain forest of southern Nigeria IV The plateau forest of the Okumu Forest Reserve. Journal of Ecology 43, 564–94.CrossRefGoogle Scholar
Jones, E. W. 1956. Ecological studies on the rain forest of southern Nigeria IV (continued) The plateau forest of the Okomu Forest Reserve. Journal of Ecology 44, 83–117.Google Scholar
Kaji, M. 1985. Study of the floristic composition and the structure of tropical rain forests in south western Cameroon. [Part I]. In Koshimizu, K. (Ed.) Search for useful plants in tropical rain forest in Cameroon, and chemical studies on biologically active substances of the plants, pp. 12–42. Kyoto, Japan: Kyoto University.Google Scholar
Kaji, M. 1990. Study on the floristic composition and the structure of tropical rain forest in south western Cameroon. [Part II]. In Koshimizu, K. (Ed.) Search for useful plants in tropical rain forest in Cameroon, and chemical studies on biologically active substances of the plants, pp. 16–40. Kyoto, Japan: Kyoto University.Google Scholar
Keay, R. W. J. 1989. Trees of Nigeria. Oxford: Clarendon Press.Google Scholar
Lebrun, J. 1936. La forêt équatoriale congolaise. Bulletin Agricole du Congo Beige 27, 163–92.Google Scholar
Lemee, G. 1961. Effects des charactères du sol sur la localisation de la végétation en zones équatoriale et tropicale humide. In Sols et végétation des régions tropicales, pp. 25–39. Abidjan 1959: UNESCO.Google Scholar
Letouzey, R. 1957. La forôt à Lophira alata de la zone littorale camerounaise. Revue Bois et Fôret des Tropiques, No. 53, 9–20.Google Scholar
Letouzey, R. 1968. Étude phytogéographique du Cameroun. Paris: P. LeChevalier.Google Scholar
Letouzey, R. 1975. Premières observations concernant au Cameroun la fôret sur cordons littoraux sablonneux. Adansonia Series 2 14, 529–42.Google Scholar
Letouzey, R. 1983. Quelque exemples camerounais de liason possible entre phénomènes géologiques et végétation. Bothalia 14, 739–44.Google Scholar
Letouzey, R. 1985. Notice de la carte phytogéographique du Cameroun Au 1:500 000. Toulouse: Institut de la Carte Internationale de la Végétation.Google Scholar
Maley, J. 1987. Fragmentation de la forêt dense humide africaine et extensions des biotopes montagnards au Quaternaire recent: Nouvelles données polliniques et chronologique; implications paleoclimatiques et biogéographiques. In Coetzee, J. A. (Ed.) Paleoecology of Africa, pp. 307–34. Rotterdam: Balkema.Google Scholar
Maley, J. 1989. Late quarternary climatic changes in the African rain forest: forest refugia and the major role of sea surface temperature variations. In Leinen, M. & Sarnthein, M. (Eds) Paleoclimatology and paleometerology: modern and past global atmospheric transport, pp. 585–616. The Netherlands: Kluwer Academic Publishers.Google Scholar
Maley, J. 1991. The African rain forest vegetation and paleoenvironments during late Quaternary. In Climatic change, pp. 79–98. Netherlands: Kluwer.Google Scholar
Mildbraed, J. 1930. Probeflächen-Aufnahmen aus dem Kamerumer Regenwald. Notizol Bot. Gard. 10, 951–76.Google Scholar
Newbery, D. McC, Gartlan, J. S., McKey, D. B., & Waterman, P. G. 1986. The influence of drainage and soil phosphorus on the vegetation of Douala-Edea Forest Reserve, Cameroun. Vegetatio 65, 149–62.CrossRefGoogle Scholar
Newbery, D. M., Alexander, I. J., Thomas, D. W. & Gartlan, J. S. 1988. Ectomycorrhizal rain-forest legumes and soil phosphorus in Korup National Park, Cameroon. New Phytologist 109, 433–50.Google Scholar
Pierlot, R. 1966. Structure et composition de forêts denses d'Afrique Centrale, spécialement celles du Kivu. Brussels: Académie Royale des Sciences d'Outre-Mer.Google Scholar
Richards, P. W. 1952. The tropical rainforest. Cambridge: Cambridge University Press.Google Scholar
Richards, P. W. 1963. Ecological notes on West African vegetation II Lowland forest of the Southern Bakundu Forest Reserve. Journal of Ecology 51, 123–49.Google Scholar
Saint-Aubin, G. de 1961. Aperçu sur la forêt du Gabon. Revue Bois et Forêts des Tropiques, No. 78, 3–17.Google Scholar
Schnell, R. 1976. La flore et la végétation de l'Afrique tropicale Parts I & II. Paris: Gauthier-Villiers.Google Scholar
Swaine, M. D. & Hall, J. B. 1988. The mosaic theory of forest regeneration and the determination of forest composition in Ghana. Journal of Tropical Ecology 4, 253–69.Google Scholar
Villiers, J.-F. 1989. Rene Letouzey (1918–1989). Bulletin de Muséum Nationale de l'Histoire Naturelle, 4e série 11, 325–32.Google Scholar
Voorhoeve, A. G. 1964. Some notes on the tropical rainforest of Yoma-Gola National Forest near Bomi Hills, Liberia. Commonwealth Forestry Review 43, 17–24.Google Scholar
Voorhoeve, A. G. 1965. Liberian high forest trees. Wageningen: Centre for Agricultural Publications and Documentation.Google Scholar
White, F. 1983. The vegetation of Africa. Paris: UNESCO.Google Scholar