Diversité floristique sous canopée en plantation forestière de Mangombe-Edea (Cameroun)

Floristic diversity under canopy in forest plantation of Mangombe-Edea (Cameroon). Trees plantation of Mangombe is situated in rain forest of low altitude. Six plots among which one of Mansonia altissima (A.Chev.) A.Chev., 2 of Lovoa trichilioides Harms, 3 of Terminalia ivorensis A.Chev. and one perturbed natural forest are concerned by this study. The work consisted to the evaluation of the floristic diversity under canopy in order to appreciate the influence of forest plantation on natural regeneration. A total of 26 families, 42 genders and 46 species were censured. Meliaceae and Apocynaceae are present in all the plots. In plot one of T. ivorensis, M. altissima and natural forest, the low value of equitability of Pielou traduces the dominance of flora by few species and the transitory situation of the ecosystem. On contrary the rest of plots present a good repartition of individuals among the species. One can notice a weak organization of the ecologic system in M. altissima plot, this corresponds to favourable conditions of environment for installation of many species represented by a few number of individuals. Shannon indices, relatively low in plot one of T. ivorensis characterize an ecosystem where one species is dominant. Globally, the regeneration under canopy is reconstituted progressively and remains less diversified than the nearest natural forest. Creation of genetic pool through selective entertainment under canopy will permit polycyclic management of plots for sustainable production of wood

AN OVERVIEW OF POLICY AND INSTITUTIONAL FRAMEWORKS IMPACTING THE USE OF NON TIMBER FOREST PRODUCTS IN CENTRAL AFRICA

Abstract This study describes an exploratory data gathering process aimed at constructing a rudimentary image of non timber forest products (NTFP

Distribution of minor allele frequency (MAF) for different <i>Macrobrachium</i> species: <i>M</i>. <i>dux</i>, <i>M</i>. <i>macrobrachion</i>, <i>M</i>. <i>sollaudii</i>, <i>M</i>. <i>vollenhovenii</i>, <i>M</i>. <i>chevalieri; M</i>. <i>felicinum</i>, and <i>M</i>. <i>sp</i>.

Distribution of minor allele frequency (MAF) for different Macrobrachium species: M. dux, M. macrobrachion, M. sollaudii, M. vollenhovenii, M. chevalieri; M. felicinum, and M. sp.</p

PCA (left plot) and DAPC (right plot) obtained from using the reduced set of ‘private SNPs’ (N = 72 SNPs, called ‘private SNPs80’ panel; see Methods).

PCA–principal component analysis; DAPC–discriminant analysis of the principal components. M_ch–M. chevalieri; M_dx–M. dux; M_fe–M. felicinum; M_ma–M. macrobrachion; M_so–M. sollaudii; M_sp–M. sp; M_vo–M. vollenhovenii.</p

Phylogenetic tree obtained using 72 private SNPs for <i>Macrobrachium</i> species: <i>M</i>. <i>dux</i>, <i>M</i>. <i>macrobrachion</i>, <i>M</i>. <i>sollaudii</i>, <i>M</i>. <i>vollenhovenii</i>, <i>M</i>. <i>chevalieri; M</i>. <i>felicinum</i>, <i>and M</i>. <i>sp</i>.

The phylogenetic tree for these Macrobrachium species using a larger set of SNPs (N = 1,814) is provided in [19].</p

PCA (left plot) and DAPC (right plot) obtained from using a full set of SNPs (N = 1,814).

PCA–principal component analysis; DAPC–discriminant analysis of principal components. M_ch–M. chevalieri;M_dx–M. dux;M_fe–M. felicinum; M_ma–M. macrobrachion; M_so–M. sollaudii; M_sp–M. sp; M_vo–M. vollenhovenii.</p

Pictures of seven <i>Macrobrachium</i> species in the coastal area of Cameroon identified based on morphological analysis using [10, 31] keys.

Pictures of seven Macrobrachium species in the coastal area of Cameroon identified based on morphological analysis using [10, 31] keys.</p

Summary statistics of the ’private SNPs’ (‘private SNPs80’; N = 72) identified in the study.

Summary statistics of the ’private SNPs’ (‘private SNPs80’; N = 72) identified in the study.</p

Cluster membership classification of <i>Macrobrachium</i> species and the Bayesian information criterion (BIC) plot obtained from the full set SNPs (N = 1,814) using the Adegenet package assuming four (K = 4) and five (K = 5) populations.

Each bar in the admixture plot (left) represents an individual: M.ch–M. chevalieri; M.dx–M. dux; M.so–M. sollaudii; M.fe–M. felicinum; M.sp–M. sp; M.ma–M. macrobrachion; M.vo–M. vollenhovenii.</p