Raymonde Mboma - Academia.edu (original) (raw)
Papers by Raymonde Mboma
Oikos, 2010
When considering all trees irrespective of their species, natural tropical rain forests typically... more When considering all trees irrespective of their species, natural tropical rain forests typically exhibit spatial patterns that range from random to regular. The regularity is often interpreted as a footprint of tree competition. Using 23 permanent sample plots totalling 61 ha in the ...
Selon la nomenclature generale de l'ATlBT, le nom commercial d'origine gabonaise andoung ... more Selon la nomenclature generale de l'ATlBT, le nom commercial d'origine gabonaise andoung et son equivalent camerounais ekop designent des especes appartenant a une dizaine de genres de Leguminosae-Caesalpinioideae (Detienne 2001). Au Gabon, les andoungs sont classes par le Ministere en charge des forets dans le groupe P2 correspondant aux essences principales dites "bois d'oeuvre faciles a commercialiser". Paradoxalement, ces arbres ne sont pas toujours faciles a identifier. En effet, les essences sont morphologiquement tres' voisines et sont regulierement sujettes a confusion (Detienne 1991). Les arbres abattus correspondraient ainsi a des categories de menaces differentes selon les criteres de la liste rouge de l'DICN. Une etude menee au Gabon dans sept concessions forestieres montre que l'appellation "andoung" prete toujours a confusion malgre les objectifs de gestion forestiere fixes par l'Etat. Dans chacune des concessions, les an...
La gestion durable des ressources naturelles implique non seulement une bonne comprehension de la... more La gestion durable des ressources naturelles implique non seulement une bonne comprehension de la structure et du fonctionnement des ecosystemes, mais aussi une connaissance detaillee des especes qui les composent. L'identification precise des especes est en effet un gage de securite dans la preparation des potions medicinales comme dans l'alimentation humaine. L'identification des taxons – et des caracteristiques utiles pour leur gestion – constituent des pre-requis indispensables a leur conservation comme a leur exploitation durable, bien que cette connaissance reste loin d'etre acquise en foret tropicale. A travers quelques etudes de cas, nous mettons en evidence les problemes et les enjeux lies a ces pre-requis. De nouveaux outils, et de nouvelles approches, peuvent etre mobilises, impliquant tant les botanistes que les parties prenantes de la gestion forestiere. Le partage des connaissances sur ces milieux tres complexes que sont les forets tropicales, sous une ...
Biodiversitas Journal of Biological Diversity, 2021
Snakebites remain a major health issue in tropical and subtropical regions in the world. The limi... more Snakebites remain a major health issue in tropical and subtropical regions in the world. The limited access of antivenom sera in remote areas of many countries forces populations to rely on plant-based remedies to manage snakebite-induced injury. In this study, we conducted an ethnobotanical survey of medicinal plants used for the management of snakebites in the district of Bissok (Northern Gabon). After collecting and verifying the authenticity of the plants, we further performed their phytochemical analysis. The procedure used in this study involved a structured questionnaire and direct interviews of local populations. Overall, data collected on-site included local names, the part of the plant used, the preparation, and the route of administration. The presence of some phytochemical compounds was determined according to standard methods. Overall, a total of 29 species of plants belonging to 20 different families were reported to be used to treat snakebites. The plants used were herbs (44.80%), trees (24.10%), shrubs (20.70%), liana (10.30%), and rhizomes (6.90%). They were mainly used as poultice or crush, and to a lesser extent as decoction and maceration. Regarding the route of administration, interviewees reported mainly external use on the site of the bite. Concerning the chemical composition, we found that the antivenom plants were rich in chemical compounds known to have antivenom, antipyretic and antimicrobial properties, e.g. alkaloids, terpenoids, flavonoids, steroids, coumarins, phenols, tannins gallic Our results open avenues to develop venom enzyme inhibitory assays.
International Journal of Advanced Research, 2021
In traditional medicine, Annnickia chlorantha (Annonaceae)is used in many parts of Africa to trea... more In traditional medicine, Annnickia chlorantha (Annonaceae)is used in many parts of Africa to treat several pathologies. It is used for the management of stomach problems, for the treatment of jaundice, tuberculosis, urinary tract infections, malaria, hepatitis and ulcers forms, for gallstones or even diarrhea. The phytochemical analysis and determination of the antiradical activity of the methanolic extract of the trunk bark from Annickia chlorantha from Gabon was the subject of this study. Phytochemical screening revealed the abundance of alkaloids, polyphenols and catechics tannins.The total polyphenol content released by the Folin-Ciocalteu method was 309.17 ± 38.05 g of gallic acid equivalent per 100 mg of dry matterand the total flavonoids content performed with AlCl3 was 155.16 ± 21.06 g of quercetin equivalent per 100 mg of dry matter. The antiradical activity was limited to 81.58% ± 1.25 without disappearance of the ABTS•+ radical after 6 minutes of incubation. These re...
Les forets tropicales humides en general, et celles du Gabon en particulier, ont une richesse spe... more Les forets tropicales humides en general, et celles du Gabon en particulier, ont une richesse specifique d'arbres exceptionnelle. Comprendre comment cette diversite s'organise dans l'espace et dans le temps, c'est-a-dire comprendre pourquoi telle espece d'arbre va etre trouvee a tel endroit a tel moment, demeure un challenge pour la science. On a longtemps considere que la composition d'une foret etait le fruit d'un processus de succession immuable, conduisant d'une foret secondaire apres perturbation a une foret climacique ou mature, la foret mature etant le point de convergence obligatoire de la succession vegetale. Et une foret ayant atteint le stade climacique restait dans cet etat tant qu'elle n'etait pas a nouveau perturbee. Les resultats des etudes que nous avons menees dans la foret dense humide du Gabon font ressortir une autre vision : une foret est un milieu beaucoup plus dynamique, en perpetuels changements ; il n'existe pas de...
Sur une superficie de 267.667 km2 pour le territoire national du Gabon, la foret occupe pres de 2... more Sur une superficie de 267.667 km2 pour le territoire national du Gabon, la foret occupe pres de 23 millions d'hectares, soit environ 85 %. Cette foret qui fait partie du grand massif forestier du bassin du Congo (deuxieme grand massif forestier apres l'Amazonie) regorge d'une richesse botanique elevee avec de nombreuses especes endemiques. Pour contribuer a la gestion durable de ces forets, il importe de pouvoir predire leur evolution naturelle. Dans la plupart des forets non perturbees du Gabon, beaucoup d'especes presentent souvent une distribution diametrique en forme de cloche suggerant un deficit de regeneration. Les especes concernees par ce phenomene sont essentiellement heliophiles, a croissance rapide et qui sont egalement, pour la plupart d'entre elles, des especes commerciales. Cependant, les resultats de notre etude menee dans le Haut Abanga, au Gabon, montrent que toutes les especes heliophiles ne respectent pas cette regle. C'est le cas notammen...
International Journal of Advanced Research, 2021
An ethnobotanical study of medicinal plants was carried out among the Mitsogho people of thefour ... more An ethnobotanical study of medicinal plants was carried out among the Mitsogho people of thefour (4) villages located from Oyane 4 to Four-Place (Estuaire-Gabon). The objective of this study was firsttodraw up an inventory of plants used in their traditional medicine against infant diarrhea and then to describe the recipes applied by the local population. Sixteen (16) plants species belonging to sixteen (16) genus and eleven (11) families were identified. The most species cited were Sida rhombifolia (18%), Cyathula prostrata (12%), Desmodium adscendens (12%), andPsidium guineense (12%). Those with the lowest frequencies were among others Picralima nitida (6%) and Santiria trimera (6%). The most represented families are Malvaceae (25%), Apocynaceae (12.5%) and Fabaceae (12.5%). The plants inventoried are mainly woody (81%) trunk bark (56%) and leaves (37%) are the most used plant parts. Twenty-two (22) recipes have been described, of which 77% contain a single plant and 23% are mixture.
When considering all trees irrespective of their species, natural tropical rain forests typically... more When considering all trees irrespective of their species, natural tropical rain forests typically exhibit spatial patterns that range from random to regular. The regularity is often interpreted as a footprint of tree competition. Using 23 permanent sample plots totalling 61 ha in the ...
Oikos, 2010
When considering all trees irrespective of their species, natural tropical rain forests typically... more When considering all trees irrespective of their species, natural tropical rain forests typically exhibit spatial patterns that range from random to regular. The regularity is often interpreted as a footprint of tree competition. Using 23 permanent sample plots totalling 61 ha in the ...
Selon la nomenclature generale de l'ATlBT, le nom commercial d'origine gabonaise andoung ... more Selon la nomenclature generale de l'ATlBT, le nom commercial d'origine gabonaise andoung et son equivalent camerounais ekop designent des especes appartenant a une dizaine de genres de Leguminosae-Caesalpinioideae (Detienne 2001). Au Gabon, les andoungs sont classes par le Ministere en charge des forets dans le groupe P2 correspondant aux essences principales dites "bois d'oeuvre faciles a commercialiser". Paradoxalement, ces arbres ne sont pas toujours faciles a identifier. En effet, les essences sont morphologiquement tres' voisines et sont regulierement sujettes a confusion (Detienne 1991). Les arbres abattus correspondraient ainsi a des categories de menaces differentes selon les criteres de la liste rouge de l'DICN. Une etude menee au Gabon dans sept concessions forestieres montre que l'appellation "andoung" prete toujours a confusion malgre les objectifs de gestion forestiere fixes par l'Etat. Dans chacune des concessions, les an...
La gestion durable des ressources naturelles implique non seulement une bonne comprehension de la... more La gestion durable des ressources naturelles implique non seulement une bonne comprehension de la structure et du fonctionnement des ecosystemes, mais aussi une connaissance detaillee des especes qui les composent. L'identification precise des especes est en effet un gage de securite dans la preparation des potions medicinales comme dans l'alimentation humaine. L'identification des taxons – et des caracteristiques utiles pour leur gestion – constituent des pre-requis indispensables a leur conservation comme a leur exploitation durable, bien que cette connaissance reste loin d'etre acquise en foret tropicale. A travers quelques etudes de cas, nous mettons en evidence les problemes et les enjeux lies a ces pre-requis. De nouveaux outils, et de nouvelles approches, peuvent etre mobilises, impliquant tant les botanistes que les parties prenantes de la gestion forestiere. Le partage des connaissances sur ces milieux tres complexes que sont les forets tropicales, sous une ...
Biodiversitas Journal of Biological Diversity, 2021
Snakebites remain a major health issue in tropical and subtropical regions in the world. The limi... more Snakebites remain a major health issue in tropical and subtropical regions in the world. The limited access of antivenom sera in remote areas of many countries forces populations to rely on plant-based remedies to manage snakebite-induced injury. In this study, we conducted an ethnobotanical survey of medicinal plants used for the management of snakebites in the district of Bissok (Northern Gabon). After collecting and verifying the authenticity of the plants, we further performed their phytochemical analysis. The procedure used in this study involved a structured questionnaire and direct interviews of local populations. Overall, data collected on-site included local names, the part of the plant used, the preparation, and the route of administration. The presence of some phytochemical compounds was determined according to standard methods. Overall, a total of 29 species of plants belonging to 20 different families were reported to be used to treat snakebites. The plants used were herbs (44.80%), trees (24.10%), shrubs (20.70%), liana (10.30%), and rhizomes (6.90%). They were mainly used as poultice or crush, and to a lesser extent as decoction and maceration. Regarding the route of administration, interviewees reported mainly external use on the site of the bite. Concerning the chemical composition, we found that the antivenom plants were rich in chemical compounds known to have antivenom, antipyretic and antimicrobial properties, e.g. alkaloids, terpenoids, flavonoids, steroids, coumarins, phenols, tannins gallic Our results open avenues to develop venom enzyme inhibitory assays.
International Journal of Advanced Research, 2021
In traditional medicine, Annnickia chlorantha (Annonaceae)is used in many parts of Africa to trea... more In traditional medicine, Annnickia chlorantha (Annonaceae)is used in many parts of Africa to treat several pathologies. It is used for the management of stomach problems, for the treatment of jaundice, tuberculosis, urinary tract infections, malaria, hepatitis and ulcers forms, for gallstones or even diarrhea. The phytochemical analysis and determination of the antiradical activity of the methanolic extract of the trunk bark from Annickia chlorantha from Gabon was the subject of this study. Phytochemical screening revealed the abundance of alkaloids, polyphenols and catechics tannins.The total polyphenol content released by the Folin-Ciocalteu method was 309.17 ± 38.05 g of gallic acid equivalent per 100 mg of dry matterand the total flavonoids content performed with AlCl3 was 155.16 ± 21.06 g of quercetin equivalent per 100 mg of dry matter. The antiradical activity was limited to 81.58% ± 1.25 without disappearance of the ABTS•+ radical after 6 minutes of incubation. These re...
Les forets tropicales humides en general, et celles du Gabon en particulier, ont une richesse spe... more Les forets tropicales humides en general, et celles du Gabon en particulier, ont une richesse specifique d'arbres exceptionnelle. Comprendre comment cette diversite s'organise dans l'espace et dans le temps, c'est-a-dire comprendre pourquoi telle espece d'arbre va etre trouvee a tel endroit a tel moment, demeure un challenge pour la science. On a longtemps considere que la composition d'une foret etait le fruit d'un processus de succession immuable, conduisant d'une foret secondaire apres perturbation a une foret climacique ou mature, la foret mature etant le point de convergence obligatoire de la succession vegetale. Et une foret ayant atteint le stade climacique restait dans cet etat tant qu'elle n'etait pas a nouveau perturbee. Les resultats des etudes que nous avons menees dans la foret dense humide du Gabon font ressortir une autre vision : une foret est un milieu beaucoup plus dynamique, en perpetuels changements ; il n'existe pas de...
Sur une superficie de 267.667 km2 pour le territoire national du Gabon, la foret occupe pres de 2... more Sur une superficie de 267.667 km2 pour le territoire national du Gabon, la foret occupe pres de 23 millions d'hectares, soit environ 85 %. Cette foret qui fait partie du grand massif forestier du bassin du Congo (deuxieme grand massif forestier apres l'Amazonie) regorge d'une richesse botanique elevee avec de nombreuses especes endemiques. Pour contribuer a la gestion durable de ces forets, il importe de pouvoir predire leur evolution naturelle. Dans la plupart des forets non perturbees du Gabon, beaucoup d'especes presentent souvent une distribution diametrique en forme de cloche suggerant un deficit de regeneration. Les especes concernees par ce phenomene sont essentiellement heliophiles, a croissance rapide et qui sont egalement, pour la plupart d'entre elles, des especes commerciales. Cependant, les resultats de notre etude menee dans le Haut Abanga, au Gabon, montrent que toutes les especes heliophiles ne respectent pas cette regle. C'est le cas notammen...
International Journal of Advanced Research, 2021
An ethnobotanical study of medicinal plants was carried out among the Mitsogho people of thefour ... more An ethnobotanical study of medicinal plants was carried out among the Mitsogho people of thefour (4) villages located from Oyane 4 to Four-Place (Estuaire-Gabon). The objective of this study was firsttodraw up an inventory of plants used in their traditional medicine against infant diarrhea and then to describe the recipes applied by the local population. Sixteen (16) plants species belonging to sixteen (16) genus and eleven (11) families were identified. The most species cited were Sida rhombifolia (18%), Cyathula prostrata (12%), Desmodium adscendens (12%), andPsidium guineense (12%). Those with the lowest frequencies were among others Picralima nitida (6%) and Santiria trimera (6%). The most represented families are Malvaceae (25%), Apocynaceae (12.5%) and Fabaceae (12.5%). The plants inventoried are mainly woody (81%) trunk bark (56%) and leaves (37%) are the most used plant parts. Twenty-two (22) recipes have been described, of which 77% contain a single plant and 23% are mixture.
When considering all trees irrespective of their species, natural tropical rain forests typically... more When considering all trees irrespective of their species, natural tropical rain forests typically exhibit spatial patterns that range from random to regular. The regularity is often interpreted as a footprint of tree competition. Using 23 permanent sample plots totalling 61 ha in the ...