Fisheries in the Southern Border Zone of Takamanda - Impact ...

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24 Sunderland et al. Table 2. Summary of floristic data for plots in Takamanda Forest Reserve, Cameroon Site Plot # # of trees with species including Berlinia bracteosa, B. craibiana, Afzelia pachyloba, A. bipindensis, Microberlinia bisulcata, Erythrophloem ivorense, Gilbertiodendron brachystegioides, G. deweveri, Monopetalanthus letestui, M. microphyllus, and Brachystegia kennedyi. Along with Afrostyrax kamerunensis, the family Olacaceae dominates the middle-story of lowland forest with Strombosia grandiflora, S. pustulata, S. scheffleri, and Strombosiopsis tetandra being particularly abundant. The Ebenaceae are also a common component of the middle-story, particularly the genus Diospyros represented by D. crassiflora, D. preussii, D. sanzaminika, D. simulans, D. suaveolens, and D. zenkeri. The Celastraceae are also abundant with many species of Salacia present. Other abundant species are Angylocalyx zenkeri, Annickia chlorantha, Anonidium mannii, Polyalthia suaveolens, Calpocalyx dinklagei, Corynanthe pachyceras, Cyrtogonone argentea, Dacryodes igaganga, Dactyladenia mannii, Dialium bipindensis, Discoglypremna caloneura, Garcinia mannii, Grewia coriacea, Homalium dolichophyllum, Hypnodaphnis zenkeri, Isolona hexaloba, Monodora tenuifolia, Pausinystalia macroceras, Plagiostyles africana, Polayalthia suaveolens, Protomegabaria stapfiana, Scottelia mimfiensis, Sorindeia grandifolia, Tabernaemontana crassa, Tapura africana, Treculia obovoidea, Usteria guineensis, Xylopia staudtii, and the stilt-rooted Santiria trimera and Uapaca guineensis. Takamanda: the Biodiversity of an African Rainforest # of species Shannon©s Index (H©) Evenness (E) Common small trees in the understory include Antidesma laciniatum var. laciniatum, Baphia leptobotrys, B. nitida, Dorstenia tubinata, Lasianthera africana, Maesobotrya dusenii, Mareya micrantha, Mareyopsis longifolia, Massularia acuminata, Rinorea dentate, and Rothmannia lujae. Common herbs in the closed-canopy lowland forest are Costus englerianus, Dracaena camerooniana, D. phrynoides, Dorstenia mannii, D. barteri var. multiradiata, Mapania amplivaginata, Renealmia polypus, and Scadoxus cinnabarinus. The Commelinaceae is also well represented in the herbaceous layer, notably Aneilmia beninense, Palisota ambigua, P. barteri, P mannii, P. capitata, and Pollia condensata. Groups of the crimson rosettes of the parasitic Thonningia sanguinea are often seen on the forest floor. In the lowland forest, additional vegetation sub-types are distinguishable; that is, riverine forest and extensive areas of secondary forest. Two plots were established in the riverine forest, but only qualitative collections were conducted in the secondary forests. 4.2.1.1 Riverine forest Fisher©s Index Mean dbh (cm) Total BA Lowland ridge forest 6 491 103 3.95 0.85 39.7 30.0 34.7 Lowland ridge forest 7 498 98 3.82 0.83 36.0 32.8 42.1 Lowland rainforest 10 414 90 3.86 0.86 34.8 29.7 28.7 Lowland rainforest 11 428 113 4.01 0.85 50.1 25.4 21.7 Lowland (riverine) rainforest 12 426 93 3.81 0.84 36.1 30.9 32.0 Lowland (riverine) rainforest 13 477 118 4.03 0.84 50.2 29.3 32.1 Lowland rainforest 14 406 83 3.62 0.82 31.0 35.6 40.5 Lowland rainforest 15 438 91 3.89 0.87 33.7 31.1 33.2 Mid-altitude 8 527 64 3.29 0.79 19.1 24.4 24.6 Montane/savanna 9 523 74 3.59 0.84 23.5 21.3 18.6 The extensive drainage pattern of the Takamanda region has given rise to large areas of lowland forest heavily influenced by seasonal inundation and periodic flooding. This forest formation is relatively extensive within the
Vegetation Assessment Figure 2. Structure and composition of lowland forest habitat in Takamanda Forest Reserve, Cameroon, from biodiversity plots, showing relative density and relative basal area by (a) species, and (b) family. (a) Afrostyrax kamerunensis Strombosiopsis tetrandra Strombosia grandifolia Treculia obovoidea Irvingia gabonensis Klainedoxa gabonensis Cylicodricus gabunensis Tabernaemontana crassa Duboscia macrocarpa (b) Alstonia congensis Olacaceae Euphorbiaceae Leg-Mimosoideae Huaceae Irvingiaceae Leg-Caesalpinioideae Apocynaceae Annonaceae Leg-Papilionoideae Sterculiaceae Relative Density Relative BA 0 2 4 6 8 10 Relative Density Relative BA 0 2 4 6 8 10 12 14 25 SI/MAB Series #8, 2003
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76 The sites which have been survey
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84 LeBreton et al. 3 Methods A team
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144 Table 1. Type and number of fis
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148 Mdaihli et al. Mochokidae Barbu
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150 Monthly yield (t) 200 160 120 8
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No. of individuals (n = 315) 200 15
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No. of individuals (n = 1065) 1000
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Gnetum spp. Piper guineensis Site T
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Resource Impacts of seasonality Ava
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