Augustin Mewounko, Roger Darman Djoulde, Alain Christian Misse, Oumarou Yakouba, Simon Djakba Basga, Philémon Kaouvon, Charles Amele Njoumoui
Le riz est une céréale cultivée et consommée partout en Afrique. Au Cameroun, il est cultivé en système irrigué, pluvial et bas fond. Sa production par an estimée à 360 000 t, est très inférieure à la demande estimée à environ 800 000 t de paddy. L’Est – Cameroun présente des riches potentialités favorables à la riziculture pluviale, qui reste cependant faiblement pratiquée. Pour cette étude, l’objectif est d’identifier les causes qui freinent la pratique de la riziculture dans cette région potentiellement favorable. Des bassins de productions du riz ont été identifiés par la Délégation Régionale de l’Agriculture et de Développement Rural de l’Est (DRADERE) et la Station Polyvalente de Recherche Agricole de Bertoua (SPRAB) dans les départements de la Kadey, de Lom et Djerem et du Haut Nyong. Ainsi 200 producteurs ont été enquêtés dans 25 villages afin d’identifier les facteurs qui limitent la pratique de la riziculture dans cette région. Il ressort que le rendement moyen régional est de 1,7 t/ha, alors qu’ils sont de 2,2 t/ha dans la Kadey, 1,6 t/ha dans le Lom et Djerem et de 1,2 t/ha dans le Haut Nyong. Les contraintes telles que la baisse de fertilité des sols, les oiseaux ravageurs, la qualité de semence, le traitement post - récolte (TPR), la non maitrise de l’itinéraire technique (ITK), les maladies, les insectes ravageurs, le stress hydrique et la destruction par les hérissons ont été révélées dans tous les trois départements. Cependant, la baisse de fertilité des sols, les oiseaux ravageurs et le traitement post - récolte sont identifiées comme contraintes principales alors que la destruction des hérissons et le déficit hydrique sont des contraintes mineures. Pour réussir la riziculture à l’Est-Cameroun, il faudrait tenir compte de toutes ces contraintes de production qui peuvent compromettre le rendement. Abstract Rice is a cereal grown and consumed everywhere in Africa. In Cameroon, it is grown in irrigated, rainy and lowland system. Its production per year estimated at 360 000 t is much inferior to the estimated demand for about 800,000t of paddy. East - Cameroon has rich potential favorable to upland rice cultivation, which is however weakly practiced. For this study, the objective is to identify the causes that hinder the practice of rice growing in this potentially favorable region. Rice production pools have been identified by the Regional Delegation of Agriculture and Rural Development of Bertoua (RDARDB) and Bertoua Polyvalent Agricultural Research Station (BPARS) in the Kadey division, Lom and Djerem division and Haut Nyong division. Thus 200 producers have been administered questionnaire in 25 villages to identify the factors that limit the practice of rice growing in this region. This study shows that the regional means is 1,7 t/ha, meanwhile in the Kadey Division we have 2,2 t/ha, in the LOM and Djerem Division we have 1,6 t/ha and 1,2 t/ha in Haut Nyong Division. Several constraints have been revealed in the tree division
{"title":"Contraintes de production du riz pluvial dans la Région de l’Est – Cameroun","authors":"Augustin Mewounko, Roger Darman Djoulde, Alain Christian Misse, Oumarou Yakouba, Simon Djakba Basga, Philémon Kaouvon, Charles Amele Njoumoui","doi":"10.4314/cajeb.v16i1.7","DOIUrl":"https://doi.org/10.4314/cajeb.v16i1.7","url":null,"abstract":"Le riz est une céréale cultivée et consommée partout en Afrique. Au Cameroun, il est cultivé en système irrigué, pluvial et bas fond. Sa production par an estimée à 360 000 t, est très inférieure à la demande estimée à environ 800 000 t de paddy. L’Est – Cameroun présente des riches potentialités favorables à la riziculture pluviale, qui reste cependant faiblement pratiquée. Pour cette étude, l’objectif est d’identifier les causes qui freinent la pratique de la riziculture dans cette région potentiellement favorable. Des bassins de productions du riz ont été identifiés par la Délégation Régionale de l’Agriculture et de Développement Rural de l’Est (DRADERE) et la Station Polyvalente de Recherche Agricole de Bertoua (SPRAB) dans les départements de la Kadey, de Lom et Djerem et du Haut Nyong. Ainsi 200 producteurs ont été enquêtés dans 25 villages afin d’identifier les facteurs qui limitent la pratique de la riziculture dans cette région. Il ressort que le rendement moyen régional est de 1,7 t/ha, alors qu’ils sont de 2,2 t/ha dans la Kadey, 1,6 t/ha dans le Lom et Djerem et de 1,2 t/ha dans le Haut Nyong. Les contraintes telles que la baisse de fertilité des sols, les oiseaux ravageurs, la qualité de semence, le traitement post - récolte (TPR), la non maitrise de l’itinéraire technique (ITK), les maladies, les insectes ravageurs, le stress hydrique et la destruction par les hérissons ont été révélées dans tous les trois départements. Cependant, la baisse de fertilité des sols, les oiseaux ravageurs et le traitement post - récolte sont identifiées comme contraintes principales alors que la destruction des hérissons et le déficit hydrique sont des contraintes mineures. Pour réussir la riziculture à l’Est-Cameroun, il faudrait tenir compte de toutes ces contraintes de production qui peuvent compromettre le rendement. \u0000 Abstract \u0000Rice is a cereal grown and consumed everywhere in Africa. In Cameroon, it is grown in irrigated, rainy and lowland system. Its production per year estimated at 360 000 t is much inferior to the estimated demand for about 800,000t of paddy. East - Cameroon has rich potential favorable to upland rice cultivation, which is however weakly practiced. For this study, the objective is to identify the causes that hinder the practice of rice growing in this potentially favorable region. Rice production pools have been identified by the Regional Delegation of Agriculture and Rural Development of Bertoua (RDARDB) and Bertoua Polyvalent Agricultural Research Station (BPARS) in the Kadey division, Lom and Djerem division and Haut Nyong division. Thus 200 producers have been administered questionnaire in 25 villages to identify the factors that limit the practice of rice growing in this region. This study shows that the regional means is 1,7 t/ha, meanwhile in the Kadey Division we have 2,2 t/ha, in the LOM and Djerem Division we have 1,6 t/ha and 1,2 t/ha in Haut Nyong Division. Several constraints have been revealed in the tree division","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90204941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Raïssa S. Atchioutchoua, G. Kanmegne, Gaston R. Noumbo Tsopmbeng
Canarium schweinfurthii is one of the agro-forestry tree species with multiple uses in the subtropical countries which is still exploited wild. The purpose of this study was to get insights related to peasants' perceptions on the socio-economic importance and cultivation practice of the species in the Western Highlands of Cameroon. The methodology consisted of surveys among people spread over 7 villages. Two hundred (200) people who were involved in C. schweinfurthii exploitation were selected in the study area following a random approach and interviewed using a structured questionnaire. In addition to the identification of respondents, the information collected from interviewees focused on: 1) knowledge, uses, harvesting methods and the impact of the exploitation of the species on the well-being of people; 2) the trend of the population’s dynamics of the species and, 3) the know-how and practices in the cultivation of the plant. The results showed that almost all the interviewees (99%) knew the species that they exploit in six categories of use (food, medicine, handicraft, construction, timber industry and firewood supply), with a broad consensus (Cs = 0.98) for the use in food. The degree of consensus remained low for its use in medicine (Cs= -0.18), firewood supply (Cs= -0.21), timber industry (Cs= -0.65), construction (Cs= -0.77) and handicrafts (Cs= -0.84). According to 80% of respondents, income from the sale of the fruits significantly contributes to household welfare. The most cited harvesting method was fruits picking, which does not endanger the species. Only 37% of the interviewees perceived a regressive trend in the dynamics of the species' population over the last decade. For 71% of the respondents, the cultivation practice by farmers is rare or even non-existent. The main reasons for non-cultivation of the species are the uncertainty that the planted trees will bear fruits (80% of respondents) and the long duration of the vegetative growth phase (55% of respondents). 90% of respondents expressed their willingness to adopt the cultivation of the species if these constraints are circumvented. These findings showed that C. schweinfurthii would be an interesting candidate for participatory domestication in the Western Highland of Cameroon, for the intensification of agro-forestry systems. For this purpose, the establishment of an efficient protocol for asexual propagation of fruit-producing individuals is needed.
{"title":"Peasants' perceptions on the socioeconomic importance and cultivation practice of Canarium schweinfurthii Engl. (Black olive tree) in the Western Highlands of Cameroon","authors":"Raïssa S. Atchioutchoua, G. Kanmegne, Gaston R. Noumbo Tsopmbeng","doi":"10.4314/cajeb.v16i1.8","DOIUrl":"https://doi.org/10.4314/cajeb.v16i1.8","url":null,"abstract":"Canarium schweinfurthii is one of the agro-forestry tree species with multiple uses in the subtropical countries which is still exploited wild. The purpose of this study was to get insights related to peasants' perceptions on the socio-economic importance and cultivation practice of the species in the Western Highlands of Cameroon. The methodology consisted of surveys among people spread over 7 villages. Two hundred (200) people who were involved in C. schweinfurthii exploitation were selected in the study area following a random approach and interviewed using a structured questionnaire. In addition to the identification of respondents, the information collected from interviewees focused on: 1) knowledge, uses, harvesting methods and the impact of the exploitation of the species on the well-being of people; 2) the trend of the population’s dynamics of the species and, 3) the know-how and practices in the cultivation of the plant. The results showed that almost all the interviewees (99%) knew the species that they exploit in six categories of use (food, medicine, handicraft, construction, timber industry and firewood supply), with a broad consensus (Cs = 0.98) for the use in food. The degree of consensus remained low for its use in medicine (Cs= -0.18), firewood supply (Cs= -0.21), timber industry (Cs= -0.65), construction (Cs= -0.77) and handicrafts (Cs= -0.84). According to 80% of respondents, income from the sale of the fruits significantly contributes to household welfare. The most cited harvesting method was fruits picking, which does not endanger the species. Only 37% of the interviewees perceived a regressive trend in the dynamics of the species' population over the last decade. For 71% of the respondents, the cultivation practice by farmers is rare or even non-existent. The main reasons for non-cultivation of the species are the uncertainty that the planted trees will bear fruits (80% of respondents) and the long duration of the vegetative growth phase (55% of respondents). 90% of respondents expressed their willingness to adopt the cultivation of the species if these constraints are circumvented. These findings showed that C. schweinfurthii would be an interesting candidate for participatory domestication in the Western Highland of Cameroon, for the intensification of agro-forestry systems. For this purpose, the establishment of an efficient protocol for asexual propagation of fruit-producing individuals is needed. ","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89960620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Eric Cantona Ndonmou, Junior Baudoin Taffo Wouokoue, Mubeteneh Christopher Tankou, Christian Hervé Siohdjie Sime, Marie Louise Tientcheu Avana
Grâce à de nombreux projets qui revalorisent le cacaoyer (Theobroma cacao) et le caféier (Coffea robusta et arabica) dans les savanes humides de l’Ouest-Cameroun, les systèmes agroforestiers (SAFs) à base de caféiers et de cacaoyers recolonisent les espaces et renforcent les capacités de ces savanes dans la conservation de la biodiversité. Cependant, cette contribution demeure peu valorisée dans ces régions et il est nécessaire de l’évaluer afin que ces systèmes soient désormais pris en compte par les Mécanismes de Développement Propres. Dans 7 villages (Bamengui, Ngwatta, Machoutpou, Medima, Maheutchou, Bandounga et Fomopea) répartis sur trois altitudes (400-800m, 800-1200m et 1200-1600m), 82 SAFs dont 43 SAFs cacaoyers, 23 SAFs caféiers et 16 SAFs mixtes ont été caractérisés. Les placettes de 60*40m et de 40*20 m étaient installées pour mesurer les arbres au DHP≥30 cm et pour les arbres au DHP<30 cm respectivement. Globalement, 84 espèces associées au Theobroma cacao et au Coffea spp. ont été identifiées, au rang desquelles Khaya senegalensis, Vittelaria paradoxa et Podocarpus mannii, inscrites sur la liste rouge de l’UICN. Les espèces les plus abondantes étaient Elaeis guineensis (35,2%), Dacryodes edulis (13,9%) et Persea americana (3,9%). Les familles les plus abondantes étaient les Arecaceae (35,2%) et les Burseraceae (14,6%). Les indices moyens de diversité étaient de 1,64±0,35bits pour Shannon, 0,49±0,15 pour Simpson et 0,42±0,10 pour Piélou traduisant la faible diversité de l’ensemble des SAFs. Ces systèmes avaient des densités moyennes de 1838,43±573,89 individus/ha. Les surfaces terrières moyennes étaient de 18±15,7 m²/ha et la surface moyenne du houppier était de 5697,36±2981,81 m²/ha, pour un taux d’ombrage moyen de 56,97%. Ces valeurs variaient en fonction des types de SAFs et d’altitude. Les SAFs cacaoyers, peu considérés par la recherche dans ces régions étaient plus diversifiés, même si cela n’enlève rien à la contribution des autres types de SAFs. Abstract Many projects that revalorize cocoa (Theobroma cacao) and coffee (Coffea robusta and arabica) in the humid savannahs of West Cameroon, the coffee and cocoa agroforestry systems (AFS) are recolonizing the spaces and strengthening the capacities of these savannahs in the conservation of biodiversity. However, this contribution remains undervalued in these regions and it was necessary to assess it so that these AFS are now taken into account by the Clean Development Mechanisms. In 7 villages (Bamengui, Ngwatta, Machoutpou, Medima, Maheutchou, Bandounga and Fomopea) spread over three altitudes (400-800m, 800-1200m and 1200-1600m), 82 AFS including 43 cocoa AFS, 23 coffee AFS and 16 mixed AFS have been characterized. The 60*40 m and 40*20 m plots were respectively installed to measure trees with DBH≥30 cm and for trees with DBH<30 cm. A total of 84 species associated with Theobroma cacao and Coffea spp. have been identified, including Khaya senegalensis, Vittelaria paradox
{"title":"Contribution des agroforêts cacaoyers et caféiers à la conservation de la biodiversité végétale des savanes humides de l’Ouest-Cameroun","authors":"Eric Cantona Ndonmou, Junior Baudoin Taffo Wouokoue, Mubeteneh Christopher Tankou, Christian Hervé Siohdjie Sime, Marie Louise Tientcheu Avana","doi":"10.4314/cajeb.v16i1.9","DOIUrl":"https://doi.org/10.4314/cajeb.v16i1.9","url":null,"abstract":"\u0000 \u0000 \u0000 \u0000Grâce à de nombreux projets qui revalorisent le cacaoyer (Theobroma cacao) et le caféier (Coffea robusta et arabica) dans les savanes humides de l’Ouest-Cameroun, les systèmes agroforestiers (SAFs) à base de caféiers et de cacaoyers recolonisent les espaces et renforcent les capacités de ces savanes dans la conservation de la biodiversité. Cependant, cette contribution demeure peu valorisée dans ces régions et il est nécessaire de l’évaluer afin que ces systèmes soient désormais pris en compte par les Mécanismes de Développement Propres. Dans 7 villages (Bamengui, Ngwatta, Machoutpou, Medima, Maheutchou, Bandounga et Fomopea) répartis sur trois altitudes (400-800m, 800-1200m et 1200-1600m), 82 SAFs dont 43 SAFs cacaoyers, 23 SAFs caféiers et 16 SAFs mixtes ont été caractérisés. Les placettes de 60*40m et de 40*20 m étaient installées pour mesurer les arbres au DHP≥30 cm et pour les arbres au DHP<30 cm respectivement. Globalement, 84 espèces associées au Theobroma cacao et au Coffea spp. ont été identifiées, au rang desquelles Khaya senegalensis, Vittelaria paradoxa et Podocarpus mannii, inscrites sur la liste rouge de l’UICN. Les espèces les plus abondantes étaient Elaeis guineensis (35,2%), Dacryodes edulis (13,9%) et Persea americana (3,9%). Les familles les plus abondantes étaient les Arecaceae (35,2%) et les Burseraceae (14,6%). Les indices moyens de diversité étaient de 1,64±0,35bits pour Shannon, 0,49±0,15 pour Simpson et 0,42±0,10 pour Piélou traduisant la faible diversité de l’ensemble des SAFs. Ces systèmes avaient des densités moyennes de 1838,43±573,89 individus/ha. Les surfaces terrières moyennes étaient de 18±15,7 m²/ha et la surface moyenne du houppier était de 5697,36±2981,81 m²/ha, pour un taux d’ombrage moyen de 56,97%. Ces valeurs variaient en fonction des types de SAFs et d’altitude. Les SAFs cacaoyers, peu considérés par la recherche dans ces régions étaient plus diversifiés, même si cela n’enlève rien à la contribution des autres types de SAFs. \u0000Abstract \u0000Many projects that revalorize cocoa (Theobroma cacao) and coffee (Coffea robusta and arabica) in the humid savannahs of West Cameroon, the coffee and cocoa agroforestry systems (AFS) are recolonizing the spaces and strengthening the capacities of these savannahs in the conservation of biodiversity. However, this contribution remains undervalued in these regions and it was necessary to assess it so that these AFS are now taken into account by the Clean Development Mechanisms. In 7 villages (Bamengui, Ngwatta, Machoutpou, Medima, Maheutchou, Bandounga and Fomopea) spread over three altitudes (400-800m, 800-1200m and 1200-1600m), 82 AFS including 43 cocoa AFS, 23 coffee AFS and 16 mixed AFS have been characterized. The 60*40 m and 40*20 m plots were respectively installed to measure trees with DBH≥30 cm and for trees with DBH<30 cm. A total of 84 species associated with Theobroma cacao and Coffea spp. have been identified, including Khaya senegalensis, Vittelaria paradox","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81112421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lacatuce Tene Kenne, Marie Caroline Solefack Momo, B. Tiokeng
La perte de la biodiversité végétale dans les Unités Forestières d’Aménagements (UFA) est liée aux activités forestières pratiquées dans ce milieu. Ces activités affectent la structure et la capacité de régénération de la forêt. La présente étude vise à analyser la structure et la régénération naturelle de la végétation de l’UFA 00-004 situé dans le Littoral-Cameroun. Les inventaires se sont déroulés dans trois Assiettes Annuelles de Coupes (AAC), dont deux exploitées (AAC 1-1 et AAC 1-2) et une non exploitée (AAC 1-4). Le comptage des ligneux à diamètre à hauteur de poitrine (DHP) ≥ 10 cm s’est effectué dans les quadrats de 200 m x 200 m. Pour la régénération naturelle, les inventaires des jeunes tiges dont le DHP est < 10 cm ont été effectués dans les sous-quadrats de 2 m de côté. Globalement, 203 espèces appartenant à 158 genres et 58 familles botaniques ont été recensées. Les peuplements exploités ont présenté des densités faibles (711,5 tiges/ha pour AAC 1-1 et 810 tiges/ha pour AAC 1-2) par rapport au peuplement non exploité (1114,75 tiges/ha). Les familles les plus importantes sont les Fabaceae, Meliaceae, Apocynaceae, Malvaceae et Olacaceae pour les trois peuplements. La structure diamétrique des ligneux à DHP ≥ 10 cm présente une forme en « J » inversé pour les trois peuplements. Les espèces exploitables ont présenté quatre types de structure : la structure en forme de cloche, de « J », erratique et en « J » inversé. Le taux de régénération des espèces est plus élevé dans les peuplements exploités (43,21 % pour l’AAC 1-1 et 39,10 % pour l’AAC 1-2) comparé à celui du peuplement non exploité. Il serait nécessaire que l’administration en charge de la gestion des forêts encourage après exploitation une régénération naturelle assistée en collaboration avec les populations riveraines pour garantir une réelle reconstitution des ressources végétales après exploitation. En effet, ces populations locales, s’appuyant sur leur connaissance de la terre et sur les traditions ancestrales ou locales aident les arbres et la végétation indigène à se rétablir naturellement en éliminant les menaces à leur croissance et à leur survie Abstract The loss of plant biodiversity in Forest Management Units (FMUs) is due to the forestry activities carried out in this environment. These activities affect the structure and regeneration capacity of the forest. This study aims to analyse the structure and natural regeneration of the vegetation of FMU 00-004 in the Littoral region of Cameroon. The surveys were conducted in three Annual Allowable Cuts (AAC) of FMU 00-004, two of which are logged (AAC 1-1 and AAC 1-2) and one of which is unlogged (AAC 1-4). The woody species with a diameter ≥ 10 cm were counted in 200 m x 200 m quadrats. For natural regeneration, inventories of young stems with a diameter < 10 cm were carried out in sub-quadrats of 2 m sides. In total, 203 species belonging to 158 genera and 58 families were recorded. The logged stands had low densities
森林管理单位(fsu)植物生物多样性的丧失与该地区的林业活动有关。这些活动影响森林的结构和再生能力。本研究旨在分析位于喀麦隆海岸的ufa 00-004植被的结构和自然更新。库存在三个年度切割板(aafc)中进行，其中两个已运营(aafc 1-1和aafc 1-2)和一个未运营(aafc 1-4)。在200 m × 200 m的象限内计数胸高直径(DHP)≥10 cm的木本。为了自然再生，在边长2 m的亚象限内对DHP < 10 cm的嫩茎进行清查。共鉴定出58科158属203种。采伐林分密度较低(AAC 1-1为711.5茎/公顷，AAC 1-2为810茎/公顷)，未采伐林分密度为1114.75茎/公顷。三种林分中最重要的科是豆科、Meliaceae、夹竹桃科、Malvaceae和Olacaceae。在DHP≥10 cm时，三种林分木本的直径结构均为倒J形。可开发的物种有四种类型的结构:钟形结构、“J”结构、不稳定结构和反向“J”结构。与未开发林分相比，已开发林分的物种更新率较高(aac 1-1为43.21%，aac 1-2为39.10%)。负责森林管理的行政当局应与邻近社区合作，促进采伐后的自然再生，以确保采伐后植物资源的真正恢复。。事实上,这些当地人,他们依靠知识和地球上最古老传统地方或帮助本土树木和植被自然恢复,消除了自己成长和生存的威胁,文摘in The loss of biodiversity plant)的森林管理单位(FMUs) is due to The environment林业活动carried out in this。这些活动影响到森林的结构和再生能力。本研究旨在分析喀麦隆沿海地区FMU 00-004植被的结构和自然再生。对FMU 00-004的3次年度允许切割(AAC)进行了调查，其中2次已记录(AAC 1-1和AAC 1-2)， 1次未记录(AAC 1-4)。= =地理= =根据美国人口普查，该地区的总面积为，其中土地和(0.964平方公里)水。= =地理= =根据美国人口普查，这个县的面积为，其中土地面积为，其中土地面积为。= =地理= =根据美国人口普查局的数据，该县的总面积为，其中土地和(1.)水。原木支架的密度较低(AAC 1-1为711.5根/公顷，AAC 1-2为810根/公顷)，而未原木支架的密度为1114.75根/公顷。= =地理= =根据美国人口普查，这个县的总面积是，其中土地和(5.064平方公里)水。= =地理根据美国人口普查，这个县的总面积是土地和水。收获品种有四种结构:钟形、j形、不稳定型和倒立j形。该物种的再生率较高(AAC 1-1为43.21%，AAC 1-2为39.10%)。负责森林管理的行政当局必须与当地人民合作，促进采伐后的辅助自然再生，以确保采伐后植物资源的实际恢复。事实上，这些当地居民依靠他们对土地和祖传或当地传统的了解，通过消除对其生长和生存的威胁，帮助树木和原生植被自然恢复。
{"title":"Structure et régénération des peuplements ligneux dans l’Unité Forestière d’Aménagement (UFA) 00-004 dans le Littoral-Cameroun","authors":"Lacatuce Tene Kenne, Marie Caroline Solefack Momo, B. Tiokeng","doi":"10.4314/cajeb.v16i1.4","DOIUrl":"https://doi.org/10.4314/cajeb.v16i1.4","url":null,"abstract":"La perte de la biodiversité végétale dans les Unités Forestières d’Aménagements (UFA) est liée aux activités forestières pratiquées dans ce milieu. Ces activités affectent la structure et la capacité de régénération de la forêt. La présente étude vise à analyser la structure et la régénération naturelle de la végétation de l’UFA 00-004 situé dans le Littoral-Cameroun. Les inventaires se sont déroulés dans trois Assiettes Annuelles de Coupes (AAC), dont deux exploitées (AAC 1-1 et AAC 1-2) et une non exploitée (AAC 1-4). Le comptage des ligneux à diamètre à hauteur de poitrine (DHP) ≥ 10 cm s’est effectué dans les quadrats de 200 m x 200 m. Pour la régénération naturelle, les inventaires des jeunes tiges dont le DHP est < 10 cm ont été effectués dans les sous-quadrats de 2 m de côté. Globalement, 203 espèces appartenant à 158 genres et 58 familles botaniques ont été recensées. Les peuplements exploités ont présenté des densités faibles (711,5 tiges/ha pour AAC 1-1 et 810 tiges/ha pour AAC 1-2) par rapport au peuplement non exploité (1114,75 tiges/ha). Les familles les plus importantes sont les Fabaceae, Meliaceae, Apocynaceae, Malvaceae et Olacaceae pour les trois peuplements. La structure diamétrique des ligneux à DHP ≥ 10 cm présente une forme en « J » inversé pour les trois peuplements. Les espèces exploitables ont présenté quatre types de structure : la structure en forme de cloche, de « J », erratique et en « J » inversé. Le taux de régénération des espèces est plus élevé dans les peuplements exploités (43,21 % pour l’AAC 1-1 et 39,10 % pour l’AAC 1-2) comparé à celui du peuplement non exploité. Il serait nécessaire que l’administration en charge de la gestion des forêts encourage après exploitation une régénération naturelle assistée en collaboration avec les populations riveraines pour garantir une réelle reconstitution des ressources végétales après exploitation. En effet, ces populations locales, s’appuyant sur leur connaissance de la terre et sur les traditions ancestrales ou locales aident les arbres et la végétation indigène à se rétablir naturellement en éliminant les menaces à leur croissance et à leur survie \u0000 Abstract \u0000The loss of plant biodiversity in Forest Management Units (FMUs) is due to the forestry activities carried out in this environment. These activities affect the structure and regeneration capacity of the forest. This study aims to analyse the structure and natural regeneration of the vegetation of FMU 00-004 in the Littoral region of Cameroon. The surveys were conducted in three Annual Allowable Cuts (AAC) of FMU 00-004, two of which are logged (AAC 1-1 and AAC 1-2) and one of which is unlogged (AAC 1-4). The woody species with a diameter ≥ 10 cm were counted in 200 m x 200 m quadrats. For natural regeneration, inventories of young stems with a diameter < 10 cm were carried out in sub-quadrats of 2 m sides. In total, 203 species belonging to 158 genera and 58 families were recorded. The logged stands had low densities","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72818461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Eugène Phounzong-Tafre, Gabriel Kanmegne, Roger Doumdi-Braogue, Jarvin Ovaric Kouete, Alain Ngotio Tchinda, Jean Nguemezi-Aghofack
Fruits are products of high economic value with a very important nutritional contribution due to their richness in vitamins, minerals, fibers and bioactive compounds. However, their consumption remains insufficient because of high post-harvest losses. This is why this study was conducted with the aim of reducing post-harvest losses of bananas. Fruit treatment consisted of soaking in Triton X-100 for 10 min, then in calcium chloride solutions at different concentrations for 30 min. The effects of treatments on shelf life and ripening parameters (ripening rate and index, firmness, pH, titratable acidity, pigment and ascorbic acid contents, and activity of chlorophyllase and pectin-methylesterase) were determined. The results show that the longest storage times (25 to 27 days) were recorded in bananas treated with Triton X-100 at 2 or 4% CaCl2. The 6 % and 8% CaCl2 treatments as well as the control bananas showed the lowest storage time. The low index and slow ripening kinetics were found in bananas treated with 2 and 4% calcium chloride. The chlorophyll content gradually decreased during the storage and this in a similar way for all the treatments. No significant variation in carotenoid content was observed over time. Firmness and pH decreased significantly, while titratable acidity and ascorbic acid content increased over time. The activity of chlorophyllase and that of pectin-methylesterase increased over time. From all the above, it appears that the combined treatments with Triton X-100 and 2 or 4% calcium chloride solution significantly extended the green life duration of the bananas and slowed the physiological processes associated to ripening.
{"title":"Effet combiné du Triton X-100 et du chlorure de calcium sur le processus de murissement de la banane et quelques composants physiologiques impliqués","authors":"Eugène Phounzong-Tafre, Gabriel Kanmegne, Roger Doumdi-Braogue, Jarvin Ovaric Kouete, Alain Ngotio Tchinda, Jean Nguemezi-Aghofack","doi":"10.4314/cajeb.v16i1.1","DOIUrl":"https://doi.org/10.4314/cajeb.v16i1.1","url":null,"abstract":"Fruits are products of high economic value with a very important nutritional contribution due to their richness in vitamins, minerals, fibers and bioactive compounds. However, their consumption remains insufficient because of high post-harvest losses. This is why this study was conducted with the aim of reducing post-harvest losses of bananas. Fruit treatment consisted of soaking in Triton X-100 for 10 min, then in calcium chloride solutions at different concentrations for 30 min. The effects of treatments on shelf life and ripening parameters (ripening rate and index, firmness, pH, titratable acidity, pigment and ascorbic acid contents, and activity of chlorophyllase and pectin-methylesterase) were determined. The results show that the longest storage times (25 to 27 days) were recorded in bananas treated with Triton X-100 at 2 or 4% CaCl2. The 6 % and 8% CaCl2 treatments as well as the control bananas showed the lowest storage time. The low index and slow ripening kinetics were found in bananas treated with 2 and 4% calcium chloride. The chlorophyll content gradually decreased during the storage and this in a similar way for all the treatments. No significant variation in carotenoid content was observed over time. Firmness and pH decreased significantly, while titratable acidity and ascorbic acid content increased over time. The activity of chlorophyllase and that of pectin-methylesterase increased over time. From all the above, it appears that the combined treatments with Triton X-100 and 2 or 4% calcium chloride solution significantly extended the green life duration of the bananas and slowed the physiological processes associated to ripening.","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87486094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ifeoma Veronica Alaje, A. M. Adebisi, Okama Joyce Amadi, Adewal Musibau Alaje, Funmi Folshade Adegoke, Jubril Olawale Olalekan
Poor germination and seedling establishment as well as unavailability of seeds are major problems in sustainable production of Irvingia wombolu. Hence the need to find the right colour fruit maturity, storage time and pre-sowing water treatment on emergence and seedling vigour parameters of bitter wild mango seeds with the aim of improving this multipurpose fruit tree species. Five maturity colour which include green, yellow, yellowish green, greenish brown and dark brown were subjected to 4 water soaking regimes (0, 12, 24 and 36 h) and 4 room temperature storage duration (0, 2, 4 and 6 weeks). Completely randomized design factorial with three replications was used. Data on seed emergence capacity, seedling length, seed vigour index (SVI), stem diameter and number of leaves were subjected to analysis of variance. Results shows that significant differences (P<0.05-P<0.01) were observed in the five quality traits observed due to differences in fruit colour, soaking time and storage time. The three- way interaction between fruit colour, soaking time and storage time were significant ((P<0.05-P<0.01) for all the characters. Dark brown fruit recorded the best in terms of emergence, seedling vigour index, stem diameter and leaf while yellow colour fruit had the best in terms of plant height. Zero-hour soaking had the highest in seedling emergence, seedling vigour index and leaf number while 12 h soaking gave the best effect in terms of plant height and stem diameter. Dark brown and yellow colour fruit of I. wombolu are recommended and short duration of soaking for 0-12 h will enhance the plant height and stem diameter.
{"title":"Fruit maturity, storage time and pre-sowing water treatment effect on emergence and seedling vigour parameters of bitter wild mango (Irvingia wombolu Vermoesen) seeds in the nursery","authors":"Ifeoma Veronica Alaje, A. M. Adebisi, Okama Joyce Amadi, Adewal Musibau Alaje, Funmi Folshade Adegoke, Jubril Olawale Olalekan","doi":"10.4314/cajeb.v16i1.2","DOIUrl":"https://doi.org/10.4314/cajeb.v16i1.2","url":null,"abstract":"Poor germination and seedling establishment as well as unavailability of seeds are major problems in sustainable production of Irvingia wombolu. Hence the need to find the right colour fruit maturity, storage time and pre-sowing water treatment on emergence and seedling vigour parameters of bitter wild mango seeds with the aim of improving this multipurpose fruit tree species. Five maturity colour which include green, yellow, yellowish green, greenish brown and dark brown were subjected to 4 water soaking regimes (0, 12, 24 and 36 h) and 4 room temperature storage duration (0, 2, 4 and 6 weeks). Completely randomized design factorial with three replications was used. Data on seed emergence capacity, seedling length, seed vigour index (SVI), stem diameter and number of leaves were subjected to analysis of variance. Results shows that significant differences (P<0.05-P<0.01) were observed in the five quality traits observed due to differences in fruit colour, soaking time and storage time. The three- way interaction between fruit colour, soaking time and storage time were significant ((P<0.05-P<0.01) for all the characters. Dark brown fruit recorded the best in terms of emergence, seedling vigour index, stem diameter and leaf while yellow colour fruit had the best in terms of plant height. Zero-hour soaking had the highest in seedling emergence, seedling vigour index and leaf number while 12 h soaking gave the best effect in terms of plant height and stem diameter. Dark brown and yellow colour fruit of I. wombolu are recommended and short duration of soaking for 0-12 h will enhance the plant height and stem diameter.","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90634051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Charles Amele Ndjoumoui, Mathieu Tchideme, Edwin Dinayen Somnjom
The ever-increasing urbanisation and deforestation in the metropolises of the Eastern region has led to the loss of a great diversity of fruit and even forest species. In view of this difficulty, a study was carried out on diversity of fruit species and production contraints in home gardens in the metropolises of Eastern region of Cameroon. The methodological approach involved snowball sampling through the administration of a semi-structured questionnaire to 189 home gardens in the districts of Mandjou, Bertoua II and Batouri. The results showed a diversity of 15 fruit species corresponding to an abundance of 4126 individuals. The mandarin tree is the most cultivated species (1153 trees). Young trees (<10) are in the majority in Bertoua (55,3%) and Mandjou (60,5%). Seeds are mainly sourced from local markets (73%) and trees maintenance is almost non-existent (86,4%). The most important production contraint is low production (41,6%). This study highlighted the diversity of fruit species and production contraints in home gardens in the East Cameroon region. Key words : Diversity, fruit species, production contraints, home gardens.
{"title":"Diversité des espèces fruitières et contraintes de production des jardins de case des métropoles de la Région de l’Est Cameroun","authors":"Charles Amele Ndjoumoui, Mathieu Tchideme, Edwin Dinayen Somnjom","doi":"10.4314/cajeb.v15i1.4","DOIUrl":"https://doi.org/10.4314/cajeb.v15i1.4","url":null,"abstract":"The ever-increasing urbanisation and deforestation in the metropolises of the Eastern region has led to the loss of a great diversity of fruit and even forest species. In view of this difficulty, a study was carried out on diversity of fruit species and production contraints in home gardens in the metropolises of Eastern region of Cameroon. The methodological approach involved snowball sampling through the administration of a semi-structured questionnaire to 189 home gardens in the districts of Mandjou, Bertoua II and Batouri. The results showed a diversity of 15 fruit species corresponding to an abundance of 4126 individuals. The mandarin tree is the most cultivated species (1153 trees). Young trees (<10) are in the majority in Bertoua (55,3%) and Mandjou (60,5%). Seeds are mainly sourced from local markets (73%) and trees maintenance is almost non-existent (86,4%). The most important production contraint is low production (41,6%). This study highlighted the diversity of fruit species and production contraints in home gardens in the East Cameroon region. \u0000Key words : Diversity, fruit species, production contraints, home gardens.","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78095731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. B. Bilong Bilong, M. Oyono, S. Fosso, L. Lehman
During multiparasitism, the interspecific association among parasite species occur at the single host, population and community levels. Their detection and understanding are crucial to prevent and manage infectious diseases. In order to find out potential interspecific interactions among parasite species at a host population level, a cross-sectional study was carried out from September 2017 to July 2018 on schoolchildren aged from 4 to 15 years old; primary schools were randomly selected in the Nyong-et-Mfoumou Division. Stool samples and blood smears were analysed to detect parasitic forms of protozoa and helminths. Parasite interspecific associations were explored by ecological indices of association: Dice (D), Forbes (F) and tetrachoric coefficient (φ). The parasitological analysis revealed the presence of 13 parasite species belonging to 11 families, 9 orders, 7 classes and 5 phyla. A cooperation or positive association was found between E. coli and E. histolytica/dispar, A. lumbricoides and T. trichiura, E. coli and P. falciparum, E. histolytica/dispar and P. falciparum, E. coli and A. lumbricoides, and E. coli and T. trichiura. They co-occurred together more frequently than expected by chance. The conflict or negative association was noticed between G. intestinalis and both A. lumbricoides and T. trichiura, and between A. lumbricoides and P. falciparum. The independence was found between G. intestinalis and both E. histolytica/dispar and E. coli, and between M. perstans and En. nana, G. intestinalis, E. coli and E. histolytica/dispar. Further studies are needed to identify the real interaction mechanisms between parasite species and to evaluate the consequences of multiparasitism for both parasite species and the host.
{"title":"Ecological characterization of interspecific relationships between human parasites: conflict, cooperation or independence?","authors":"C. B. Bilong Bilong, M. Oyono, S. Fosso, L. Lehman","doi":"10.4314/cajeb.v15i1.2","DOIUrl":"https://doi.org/10.4314/cajeb.v15i1.2","url":null,"abstract":" During multiparasitism, the interspecific association among parasite species occur at the single host, population and community levels. Their detection and understanding are crucial to prevent and manage infectious diseases. In order to find out potential interspecific interactions among parasite species at a host population level, a cross-sectional study was carried out from September 2017 to July 2018 on schoolchildren aged from 4 to 15 years old; primary schools were randomly selected in the Nyong-et-Mfoumou Division. Stool samples and blood smears were analysed to detect parasitic forms of protozoa and helminths. Parasite interspecific associations were explored by ecological indices of association: Dice (D), Forbes (F) and tetrachoric coefficient (φ). The parasitological analysis revealed the presence of 13 parasite species belonging to 11 families, 9 orders, 7 classes and 5 phyla. A cooperation or positive association was found between E. coli and E. histolytica/dispar, A. lumbricoides and T. trichiura, E. coli and P. falciparum, E. histolytica/dispar and P. falciparum, E. coli and A. lumbricoides, and E. coli and T. trichiura. They co-occurred together more frequently than expected by chance. The conflict or negative association was noticed between G. intestinalis and both A. lumbricoides and T. trichiura, and between A. lumbricoides and P. falciparum. The independence was found between G. intestinalis and both E. histolytica/dispar and E. coli, and between M. perstans and En. nana, G. intestinalis, E. coli and E. histolytica/dispar. Further studies are needed to identify the real interaction mechanisms between parasite species and to evaluate the consequences of multiparasitism for both parasite species and the host. \u0000 ","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86230959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jonathan Moucharou Ngnignigniwou, Junior Baudoin Wouokoue Taffo, V. Nguetsop
This study was conducted to characterize the floristic, structural and ecological diversity of the Mawouon Forest in the Noun division (Western Highlands Cameroon). In total, 14 plots of 30 m x 100 m (3000 m²) were laid out. Within each, all individuals with a diameter ≥ 10 cm at 1.30 m in height were measured. A total of 2324 individuals belonging to 102 species, 78 genera and 35 families have been identified. The richest family was the Fabaceae (15 species) followed by Euphorbiaceae (12 species) and Moraceae (10 species). The most abundant family was the Rubiaceae (26.97%) followed by Euphorbiaceae (17.16%) and Cecropiaceae (12.65%). The Shannon diversity index was 4.51 bits and the Pielou evenness index was 0.67. Alchornea laxiflora with 89.21% of Important Value index was most importance species followed by Myrianthus arboreus (89.03%) and Polyscias fulva (79.12%). The diameter structure shows a predominance of young individuals. The abundance of megaphanerophytes and mesophanerophytes reflects the adaptive plant strategies that correspond to the competitive strategy. The relative abundance of Guinean-Congolese domain species translates a great maturity of this forest that seems little or not disturbed by human activity.
{"title":"Woody species diversity and ecological characteristics of the Mawouon forest, in the Western Highlands of Cameroon","authors":"Jonathan Moucharou Ngnignigniwou, Junior Baudoin Wouokoue Taffo, V. Nguetsop","doi":"10.4314/cajeb.v15i1.5","DOIUrl":"https://doi.org/10.4314/cajeb.v15i1.5","url":null,"abstract":"This study was conducted to characterize the floristic, structural and ecological diversity of the Mawouon Forest in the Noun division (Western Highlands Cameroon). In total, 14 plots of 30 m x 100 m (3000 m²) were laid out. Within each, all individuals with a diameter ≥ 10 cm at 1.30 m in height were measured. A total of 2324 individuals belonging to 102 species, 78 genera and 35 families have been identified. The richest family was the Fabaceae (15 species) followed by Euphorbiaceae (12 species) and Moraceae (10 species). The most abundant family was the Rubiaceae (26.97%) followed by Euphorbiaceae (17.16%) and Cecropiaceae (12.65%). The Shannon diversity index was 4.51 bits and the Pielou evenness index was 0.67. Alchornea laxiflora with 89.21% of Important Value index was most importance species followed by Myrianthus arboreus (89.03%) and Polyscias fulva (79.12%). The diameter structure shows a predominance of young individuals. The abundance of megaphanerophytes and mesophanerophytes reflects the adaptive plant strategies that correspond to the competitive strategy. The relative abundance of Guinean-Congolese domain species translates a great maturity of this forest that seems little or not disturbed by human activity.","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"127 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77609828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The incidence of healthy pregnant women carrying CTX-M-type extended-spectrum beta-lactamase (ESBL)-producing E. coli and their transmission to neonates is increasing worldwide. ESBL-E coli and especially the carriage of CTX-M-type causes early or late onset of neonatal sepsis, resulting in increased morbidity and mortality rates. Although maternal carriage and maternal-neonatal transmissions of ESBL-E have been reported in several countries, the prevalence of CTX-M-type ESBL-producing E. coli in pregnant women and its transmission to newborns at birth in Cameroon has not been reported yet. We describe here the carriage of CTX-M-type ESBL-producing E. coli pregnant women in neonatal ward of the Yaoundé gyneco-obstetric and pediatric hospital and their transmission to newborns. Among the 102 pregnant women and their newborns present in the ward, 88 (86.3%) and 75 (73.5%) E. coli strains were detected in rectal colonization, respectively. Antibiotic susceptibility testing of E. coli isolated from the mothers indicated a higher resistance rate to antibiotics of the β-lactams and sulfamide families, while the resistances to other antibiotic families (aminosides, quinolones and fluoroquinolones) were low. Comparatively, only cefotaxime (100%) showed a higher resistance rate to E. coli isolated from newborns. This may suggest a different source of contamination between mothers and newborns. Moreover, the rate of carriage of CTX-M-type ESBL-producing E. coli in pregnant mother and their newborns were 30.7 % and 14.7 %, respectively. This suggests that newborns had other colonization sources than the mothers. Indeed, multiple regression analysis indicated that newborns were exposed to CTX-M-type ESBL-producing E. coli from mothers and that from the hospital environment (eg. caregivers). Overall, the current investigation may provide insight on establishing an efficient therapeutic strategy against materno-neonatal and nosocomial transmission of CTX-M-type ESBL-producing E. coli.
{"title":"Antibiotic resistance pattern of extended-spectrum-beta lactamases-producing Escherichia coli isolated from pregnant women and their new born","authors":"Carol Suzie Titsamp Lacmago, Simon Ngamli Fewou","doi":"10.4314/cajeb.v15i1.1","DOIUrl":"https://doi.org/10.4314/cajeb.v15i1.1","url":null,"abstract":"The incidence of healthy pregnant women carrying CTX-M-type extended-spectrum beta-lactamase (ESBL)-producing E. coli and their transmission to neonates is increasing worldwide. ESBL-E coli and especially the carriage of CTX-M-type causes early or late onset of neonatal sepsis, resulting in increased morbidity and mortality rates. Although maternal carriage and maternal-neonatal transmissions of ESBL-E have been reported in several countries, the prevalence of CTX-M-type ESBL-producing E. coli in pregnant women and its transmission to newborns at birth in Cameroon has not been reported yet. We describe here the carriage of CTX-M-type ESBL-producing E. coli pregnant women in neonatal ward of the Yaoundé gyneco-obstetric and pediatric hospital and their transmission to newborns. Among the 102 pregnant women and their newborns present in the ward, 88 (86.3%) and 75 (73.5%) E. coli strains were detected in rectal colonization, respectively. Antibiotic susceptibility testing of E. coli isolated from the mothers indicated a higher resistance rate to antibiotics of the β-lactams and sulfamide families, while the resistances to other antibiotic families (aminosides, quinolones and fluoroquinolones) were low. Comparatively, only cefotaxime (100%) showed a higher resistance rate to E. coli isolated from newborns. This may suggest a different source of contamination between mothers and newborns. Moreover, the rate of carriage of CTX-M-type ESBL-producing E. coli in pregnant mother and their newborns were 30.7 % and 14.7 %, respectively. This suggests that newborns had other colonization sources than the mothers. Indeed, multiple regression analysis indicated that newborns were exposed to CTX-M-type ESBL-producing E. coli from mothers and that from the hospital environment (eg. caregivers). Overall, the current investigation may provide insight on establishing an efficient therapeutic strategy against materno-neonatal and nosocomial transmission of CTX-M-type ESBL-producing E. coli.","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81574933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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