Cameroon Journal of Experimental Biology最新文献

{"title":"Effect of Entada africana Guill. er Perr. (Mimosaceae) extracts on some symptoms of estrogen deficiency in ovariectomized Wistar rats","authors":"M. Mvondo, Harding Saah Namekong, Stéphane Minko Essono, C. F. Awounfack, D. Njamen","doi":"10.4314/cajeb.v13i1.1","DOIUrl":"https://doi.org/10.4314/cajeb.v13i1.1","url":null,"abstract":"No Abstract.","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"116 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2020-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87927077","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}

{"title":"Genetic diversity of edible smails'population ( Archachatina marginata and Achatina fulica) expoited in the coastal region of Cameroon","authors":"Gorothy Nkwendem Djouatsa, J. R. Kana, F. Meutchieye","doi":"10.4314/cajeb.v13i1.7","DOIUrl":"https://doi.org/10.4314/cajeb.v13i1.7","url":null,"abstract":"No Abstract.","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"70 1","pages":"49-55"},"PeriodicalIF":0.0,"publicationDate":"2020-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91018482","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}

{"title":"Acute and sub-chronic oral toxicity assessment of the leaf aqueous extract of Kalanchoe crenata (Crassulaceae)","authors":"A. Atsamo, E. Wado, E. P. Nguelefack-Mbuyo, P. Watcho, T. B. Nguelefack","doi":"10.4314/cajeb.v12i1.5","DOIUrl":"https://doi.org/10.4314/cajeb.v12i1.5","url":null,"abstract":"Previous studies demonstrated that the leaves of Kalanchoe crenata (Crassulaceae) possess analgesic, anti-inflammatory, anticonvulsant and cardiovascular activities but nothing is known about the toxicity of this plant material. The objective of the present study was to evaluate the acute and sub-chronic toxicities of the aqueous extract of the leaves of K. crenata (AEKC) prepared as a dry leaves decoction. Acute oral toxicity of the AEKC was evaluated in mice at doses 2, 4, 6, and 8 g/kg. Animals were observed for 3 hours post administration for signs and symptoms of intoxication. Survivors were followed up for 14 days after treatment. Wistar rats of both sexes were used for sub-chronic toxicity. They were orally treated with the AEKC at doses of 300, 600 and 1200 mg/kg/day for 4 consecutive weeks. They were further euthanized and blood was collected for biochemical and hematological analyses. A single acute administration of AEKC reduced the sensitivity to pain and the mobility of animals. These behavioral modifications disappeared 3 hours after administration. Only the dose of 8 g/kg caused the death of one female mouse out of 6, inferring a LD50 greater than 8 g/kg. The daily administration of AEKC did not induce mortality, behavioral modifications, significant variations of body weight, relative weights of the liver and kidney and plasma content of Alanine amino transferase (ALAT) and aspartate amino transferase (ASAT). Besides, no significant difference was observed on glomerular filtration rate and other parameters of renal excretion. Meanwhile, at the dose of 300 mg/kg/day, a significant increase in total bilirubin, free bilirubin and a significant decrease in conjugated bilirubin and plasma creatinine were registered. These results suggest that the aqueous extract of the leaves of K. crenata can be classified as a non-toxic substance. However, attention should be paid on the hepatic function.Keywords: Acute and sub-chronic toxicity, aqueous extract, Kalanchoe crenata, Crassulaceae","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75440684","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}

{"title":"Exploitation des fleurs de Ageratum conyzoides, Sida rhombifolia et Stylosanthes guianensis par Apis mellifera (Hymenoptera: Apidae) à Dang (Ngaoundéré, Cameroun)","authors":"Christian Wekere, Bernice Mireille Kingha Tekombo, Delphine Dongock Nguemo, Jackson Djakbe Dapsia, Esaie Faïbawa, F-N Tchuenguem Fohouo","doi":"10.4314/cajeb.v12i1.2","DOIUrl":"https://doi.org/10.4314/cajeb.v12i1.2","url":null,"abstract":"A Dang (Ngaoundere, Cameroun), d’avril a decembre 2015 et 2016, les fleurs de Ageratum conyzoides L., Sida rhombifolia L. et Stylosanthes guianensis (Aublet) Swartz ont ete observees en vue de l’etude de l’activite de butinage de Apis mellifera L. Les fleurs de chacune de ces especes vegetales ont ete prospectees deux jours par semaine, les mercredis et vendredis, entre 7h 00 et 18h 00, periode subdivisee en trois tranches horaires (7h 00-11h 00, 11h 00-15h 00 et 15h 00- 18h 00). Les resultats montrent que les butineuses de A. mellifera frequentaient intensement et regulierement chacune de ces especes vegetales pour la recolte du pollen. Cette abeille prelevait fortement le nectar chez S. rhombifolia et S. guianensis . Chez A. conyzoides cette activite etait faible. Le plus grand nombre de butineuses de A. mellifera simultanement en activite sur 1000 fleurs variait de 54 ( A. conyzoides ) a 125 ( S. rhombifolia ). Ageratum conyzoides , S. rhombifolia et S. guianensis sont des plantes apicoles fortement polliniferes pouvant etre cultivees et protegees pour augmenter la production du pollen comme produit de la ruche. Sida rhombifolia et S. guianensis sont des plantes apicoles fortement nectariferes pouvant etre cultivees et protegees pour accroitre la production du miel. Sur chacune de ces plantes, les ouvrieres de A. mellifera transportaient le pollen de fleur en fleur et peuvent ainsi etre considerees comme des pollinisateurs. Mots cles: Ageratum conyzoides , Sida rhombifolia , Stylosanthes guianensis , Apis mellifera , plante apicole, pollinisation English Abstract At Dang, from April to December 2015 and 2016, Apis mellifera L. workers foraging activity was studied on the flowers of three plants species, Ageratum conyzoides L., Sida rhombifolia L. and Stylosanthes guianensis (Aublet) Swartz. At Dang, the flowers of each plants species were observed two days per week, the Wednesdays and Fridays between 07h.00 and 18h.00, for recording the pollen and/or nectar foraging behaviour of A. mellifera workers. Results show that, A. mellifera harvested intensely and regularly the pollen of each plant species. In addition, S. rhombifolia and S. guianensis were also visited intensely and regularly for nectar; A. conyzoides was also visited for nectar but slightly. The greatest mean number of workers foraging simultaneously on the flower was 1 for each plant species, per 1000 varied from 54 (A. conyzoides) to 125 ( S. rhombifolia ). Apis mellifera workers visited the flowers of plants species others during foraging bouts. Consequently, A. conyzoides , S. rhombifolia and S. guianensis are highly polliniferous bee plants that can cultivated and protected to increase pollen production as a hive product. Sida rhombifolia and S. guianensis are highly nectariferous bee plants that can be cultivated and protected to increase the honey production. During foraging, A. mellifera workers carried pollen from flower to flower and improved pollination possibilities of ea","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78795333","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}

{"title":"Impact de l’activité de butinage de Apis mellifera Linné (Hymenoptera: Apidae) sur la pollinisation et les rendements de Ceratotheca sesamoides Endl. (Pedaliaceae) à Dang (Ngaoundéré, Cameroun)","authors":"F-N Tchuenguem Fohouo, Jackson Djakbe Dapsia, A. Ngakou, Christian Wekere, Stéphane Louabe, Esaie Faïbawa","doi":"10.4314/cajeb.v12i1.3","DOIUrl":"https://doi.org/10.4314/cajeb.v12i1.3","url":null,"abstract":"Les fleurs de Ceratotheca sesamoides ont ete observees en vue d’evaluer l’impact de l’activite de Apis mellifera sur la production fruitiere et grainiere a Ngaoundere dans un champ experimental a Dang dans la region de l’Adamaoua au Cameroun. Chaque annee, 540 boutons floraux ont ete etiquetes sur 120 plantes pour constituer quatre traitements : 120 fleurs laissees en libre pollinisation, 120 fleurs protegees des insectes, 200 fleurs protegees, puis visitees exclusivement par A. mellifera et 100 fleurs protegees puis destinees a l’ouverture et a la fermeture sans visite d’insecte ou de tout autre organisme. Le comportement de butinage des ouvrieres sur les fleurs, leur efficacite pollinisatrice, le taux de fructification, le nombre moyen de graines par gousse et le pourcentage de graines normales ont ete evalues. Sur 22 especes d’insectes recensees, A. mellifera vient en premiere position avec 42,02% de 853 visites. Les butineuses recoltent fortement le nectar et le pollen. Le plus grand nombre moyen d’ouvrieres simultanement en activite sur 1000 fleurs est de 276. Le taux de fructification, le nombre moyen de graines par gousse et le pourcentage de graines normales ont ete significativement plus eleves dans les traitements aux fleurs en libre pollinisation que dans ceux aux fleurs protegees. Par le biais de son efficacite pollinisatrice, Apis mellifera a augmente le taux de fructification de 24,59%, le nombre de graines par gousse de 11,63% et le pourcentage de graines normales de 3,93%. L’installation des colonies de A. mellifera a proximite des plantations de C. sesamoides est recommandee pour accroitre la production fruitiere et grainiere et maintenir les populations d’abeilles.Mots cles: Apis mellifera, Ceratotheca sesamoides, pollinisation, rendement, DangEnglish AbstractTo evaluate the impact of Apis mellifera on pod and seed yields of Ceratotheca sesamoides, foraging and pollinating activities of this insect were studied at Dang. From August to September 2015 and 2016, a total of 540 flowers buds were labeled from 120 plants to set up four treatments that include: 120 unlimited floral access by all visitors, 120 bagged flowers to avoid all visits, 200 visits limited to A. mellifera, and 100 flowers to be opened and closed without insect or any other organism visits. The foraging behavior of workers on flowers, their pollination efficiency, the fructification rate, the mean number of seeds per pod and the percentage of normal seeds were evaluated. Results indicate that, among 22 insect species recorded on C. sesamoides flowers, A. mellifera was the most represented with 42.02% of 853 visits. This honey bee intensely harvested nectar and pollen. The greatest mean number of workers foraging simultaneously on 1000 flowers was 276. The fructification rate, the mean number of seeds per pod and the percentage of normal seeds of treatments with unprotected flowers were significantly higher than those of treatments with flowers protected from inse","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82748517","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}

{"title":"Potentiel fourrager d’Echinochloa crus-pavonis (Kunth) Schult utilisée en phytoépuration des eaux usées domestiques","authors":"Gabriel Nicodème Tsetagho, T. Fonkou, V. Nguetsop, Martin Lekeufack","doi":"10.4314/cajeb.v12i1.7","DOIUrl":"https://doi.org/10.4314/cajeb.v12i1.7","url":null,"abstract":"L’objectif de cette etude a ete d’evaluer les possibilites de valorisation de la forte biomasse d’ Echinochloa crus-pavonis produite en epuration des eaux usees domestiques. La composition chimique de cette plante a ete estimee. Des echantillons destines aux analyses ont ete preleves sur des specimens mis en culture dans des bassins d’epuration a chaque stade phenologique (feuillu, montaison, floraison). Le pourcentage de la Matiere Seche (MS) et des cendres ainsi que le pourcentage par matiere seche de la Matiere Organique (MO), la Digestibilite de la Matiere Organique (DMO), l’Energie Metabolisable (EM), les teneurs en lipides et en fibres (NDF, ADF, ADL, hemicellulose et cellulose) ont ete determines dans les echantillons par les methodes decrites par AOAC (Association of Official Agricultural Chemists). La teneur en proteines a ete determinee par la methode Kjeldhal. La composition chimique d’ E. crus-pavonis varie significativement avec le stade phenologique. La MS, MO, NDF et ADF ont significativement augmente entre les differents stades phenologiques (P 0,05) (respectivement de 10,37 %, 17,16 % et 4,92 % au stade feuillu a 5.90 %, 14,09 % et 3,43 % MS au stade floraison). Ces resultats obtenus indiquent qu’ E. cruspavonis utilisee dans le traitement des eaux usees presente des potentialites fourrageres et pourrait donc etre utilise pour la nutrition du betail, si d’autres tests sanitaires sont menes. Mots cles: Eaux usees, E. crus-pavonis , stades phenologiques, biomasse, composition chimique English Abstract The objective of this study was to evaluate the possibilities of valorization of the high Echinochloa crus-pavonis biomass produced in an experimental wastewater treatment plant. The chemical composition of this plant was estimated. Samples for analyses were collected from specimens planted in the wetland beds at each phenological stages (leafy, bolting and the flowering stages). The percentage of dry matter (DM) and ash as well as the percentage of dry organic matter (OM), organic matter digestibility (OMD), Metabolizable energy (ME), lipid and fibre contents (NDF, ADF, ADL, hemicellulose and cellulose) were determined in samples by the methods described by AOAC (Agricultural Official Analysis Chemists Association). Protein content was determined by Kjeldhal method. The chemical composition of E. Crus-Pavonis varies significantly with the phenological stages. DM, OM, NDF and ADF significantly increased between the phenological stages (P 0.05) (respectively 10.37% DM, 17.16% DM and 4.92% DM at leafy stage to 5.90% DM, 14.09% DM and 3.43% DM at flowering stage). These results indicate that E. crus-pavonis used in wastewater treatment has forage potential and could therefore be used for livestock nutrition if tested healthy. Keywords: Wastewater, E. crus-pavonis , phenological stages, biomass, chemical composition","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84144518","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}

{"title":"Innocuity and antioxidant activities of Pentadesma butyracea (1824) leaves for its use in hormone replacement therapy","authors":"Basile Tindano, B. Bayala, S. Guenné, Maya Doukoure, M. Kiendrebeogo, G. R. Belemtougri","doi":"10.4314/cajeb.v12i1.4","DOIUrl":"https://doi.org/10.4314/cajeb.v12i1.4","url":null,"abstract":"Pentadesma butyracea is a tall tree of Western Africa commonly called better tree. Leaves are used in the treatment of several diseases including genitourinary, pregnancy and metabolic disorders. The aim of this study was to assess toxicity and antioxidant activity of hydroethanolic extract of P. butyracea leaves. The major compounds of the extract were previously identified. Oral acute toxicity was achieved on NMRI mice during 72 h after single oral-administration whereas oral sub-acute toxicity was achieved on Wistar rats during 28-days. Antioxidant activity was assessed through DPPH, FRAP and lipid peroxidation inhibition. The major phytochemicals identified in the hydroethanolic extract of P. butyracea leaves were tannins, steroids and triterpenoids, anthocyanosids, anthraquinones, saponosids, mucilage and gums. The acute toxicity study showed that the extract did not cause neither sign of toxicity nor mortality until 3000 mg/kg. The subacute toxicity study showed that the extract did not cause signs of toxicity after 28-days consecutive oral administration. Nevertheless, platelets count. total cholesterol and AST level were significantly (p<0.05) reduced. Assessment of antioxidant activity revealed that the extract possessed a great potential of scavenging free radical, to inhibit lipid peroxidation and to reduce ferric power. The extract could have hepaprotective activity and may be benefit for cholesterol reduction.Keywords: Pentadesma butyraceae, toxicity, phytochemistry, antioxidant","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80872844","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}

{"title":"Allometric models to estimate the aboveground biomass of tropical highlands savannahs trees","authors":"Junior Baudoin Wouokoue Taffo, T. Fonkou, V. Nguetsop","doi":"10.4314/cajeb.v12i1.6","DOIUrl":"https://doi.org/10.4314/cajeb.v12i1.6","url":null,"abstract":"The development of tree allometric equations is crucial to accurate savannah carbon assessment. In Africa, the absence of multi-species allometric equations for savannah ecosystems has led to broad use of pan moist tropical equations develop for forest to estimate tree biomass. The aim of this study was to develop accurate multi-species allometric regressions for estimation the aboveground biomass of trees in the Western Highlands savannahs of Cameroon. Data of aboveground woody biomass were obtained from destructive sampling of 103 trees belonging to 7 species across a range of diameter (5–38 cm). The dry aboveground biomass varied from 6.19 kg for the smallest tree to 669.45 kg for the largest tree. Proportional relationships between aboveground biomass and diameter breast height (DBH) are constructed derived from eight regression models (linear, growth, compound, exponential, quadratic, cubic, power and logarithmic). The best models were selected using coefficients of determination (R²) and relative error. The best local multi-species models using only diameter as input variable were quadratic and cubic regressions with respectively R² of 0.914 and 0.917. The quadratic model overestimates the biomass with a bias of 0.04 % while the cubic model underestimates it with a 0.012 % bias. In this study, the two multi-species allometric equation developed for savannahs can be used to produce accurate estimates of biomass and carbon stocks from diameter measurement in forest inventory data.Keywords: Aboveground biomass, Allometric equations, DBH, Highlands, savannahs","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90384019","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}

{"title":"Evolution paléohydrologique du marais Paurosa au centre du Gabon au cours des deux derniers millénaires : Contribution des diatomées","authors":"Meliphe Francis Kom, V. Nguetsop, L. Bremond, T. Fonkou, Bernadette Noumsi, D. Sebag, R. Oslisly, M. Tsalefac","doi":"10.4314/cajeb.v12i1.8","DOIUrl":"https://doi.org/10.4314/cajeb.v12i1.8","url":null,"abstract":"Cet article presente les resultats d’analyses de la variation des assemblages de diatomees le long de la carotte prelevee dans le marais Paurosa (0°12’47,4’’S; 11°35’19,3’’ E) qui se trouve dans une mosaique foret-savane au Nord du Parc National de la Lope au Gabon. Les donnees obtenues ont permis de reconstruire l’histoire paleohydrologique de ce marais depuis 2000 ans. La microflore des diatomees bien diversifiee montre d’importants changements pendant cette tranche de temps. A la base de la carotte (2000-1700 ans cal. BP), la dominance des assemblages a Pinnularia viridiformis, benthiques, indique une phase de bas niveau palustre avec probablement des eaux claires. L’episode qui s’ensuit entre 1700-700 ans cal BP montre une evolution vers des conditions plus humides marquees par l’abondance de diatomees tychoplanctoniques acidophiles et oligotrophes. Entre 700 et 500 ans BP, les assemblages de diatomees montrent une baisse du niveau d’eau marquee par l’abondance de benthiques oligotrophes alcaliphiles. L’episode 4 (500-200 ans cal BP) est comparable a l’episode 2 et indique aussi des conditions plus humides. Les conditions actuelles se mettent en place sur les 200 dernieres annees, avec un developpement de diatomees benthiques et epiphytes, typiques des mares inondees durant la saison des pluies. Les variations d’humidite de ce marais au cours de ces deux millenaires peuvent s’expliquer par des modifications de la saisonnalite et des quantites de precipitations regionales mais aussi par les conditions hydrologiques locales.Mots cles: Gabon, Marais, Savane, Diatomees, Habitat, Trophie, PaleohydrologieEnglish AbstractThis paper presents the results of the analysis of changes in diatoms assemblages along the core derived from the Paurosa Marsh (0° 12'47.4 ' 'S; 11 35'19.3 ' 'E), which is located in a forest-savanna mosaic at the northern of Lope National Park, Gabon. The data obtained led to the reconstruction of the paleaeohydrological history of this marsh for the past 2000 years. The well-diversified diatom microflora shows significant changes during this period. At the base of the core (2000-1700 cal yr BP), the predominance of benthic diatoms dominated by Pinnularia viridiformis indicates a phase of low water level with probably a clear water column. The episode that follows between 1700-700 cal yr BP shows an evolution towards wetter conditions marked by high abundances of acidophilous tychoplanktonic and oligotrophic species. Between 700 and 500 cal yr BP, the diatoms assemblages show a decrease of water level marked by high abundances of benthic alcaliphilous and oligotrophic species. Episode 4 (500 to 200 cal yr BP) is comparable to episode 2, thus indicates more humid conditions than before. The modern conditions were established since the last 200 years, with the development of benthic and epiphytic diatoms, typical of ponds flooded during the rainy season. The humidity variations of this marsh during these two millennia can be explain","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78354953","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}

{"title":"Caractéristiques morpho biométriques des populations de lapin (Oryctolagus cuniculus) au Burkina Faso","authors":"Bakari Traore, Chérubin Hien Ollo, Boureima Diarra, Alain Désiré Nikiema, Valérie Bougouma Yameogo, Andrien A.M.G. Belem","doi":"10.4314/cajeb.v12i1.1","DOIUrl":"https://doi.org/10.4314/cajeb.v12i1.1","url":null,"abstract":"Au Burkina Faso, les populations de lapins sont peu connues. En vue d’evaluer la variabilite phenotypique de ces populations de lapins, une etude a ete realisee dans les quatre zones agro ecologiques du pays (nord sahelienne, sud sahelienne, nord soudanienne et sud soudanienne). L’etude a porte sur un total de 450 lapins âges d’au moins six mois repartis dans 152 elevages. Les resultats suivants ont ete obtenus : le poids vif moyen des lapins adultes est de 1961,92 ± 304,43g pour les mâles et de 2012,98 ± 375,94g pour les femelles. Les lapins de la zone sud soudanienne ont un poids plus eleve (1984,42 ± 339,56g pour les mâles et 2024,63 ± 399,32g pour les femelles) que les autres. La longueur totale moyenne (tete, corps et queue) est de 49,92 ± 4,19cm pour les mâles et de 50,39 ± 4,75cm pour les femelles. Les lapins de la zone sud soudanienne ont la plus grande longueur (51,72 ± 4,17cm pour les mâles et 52,37 ± 4,39cm pour les femelles). Aucune difference significative n’a ete observee au seuil de 5%. Deux types genetiques de lapins sont rencontres, les lapins albinos et les lapins non albinos. Le pelage peut prendre la coloration agouti, unicolore, argentee, panache de type tachete ou plaque et multicolore. Les motifs de la robe peuvent etre unis, panachures, tachetes ou mouchetes. La quasi-totalite des lapins etudies ont des poils ordinaires, normaux, moyens et doux. Tous les lapins etudies ont une queue repliee vers le dos, une tete bombee, des oreilles dressees et une visibilite des irrigations sanguines de l’oreille. Les yeux sont rouges ou noirs. La peau et les griffes sont pigmentees ou depigmentees. Ces resultats montrent l’existence d’une variabilite phenotypique entre les populations des lapins au Burkina Faso.Mots cles: lapin, phenotype, caracteristiques, population, Burkina FasoEnglish AbstractIn Burkina Faso rabbit populations are poorly known. In order to evaluate the morphobiometric variability of these rabbit populations, a study was carried out in the four agro-ecological zones of the country (northern Sahelian, southern Sahelian, northern Sudan and southern Sudan). A total of 450 rabbits were selected from 152 farms for the study. The following results were obtained: mean live weight of adult rabbits was 1961.92 ± 304.43 g for males and of 2012.98 ± 375.94 g for females. Rabbits in the southern Sudanian zone have a higher weight (1984.42 ± 339.56 g for males and 2024.63 ± 399.32 g for females) than the others. The average total length is 49.92 ± 4.19 cm for males and 50.39 ± 4.75 cm for females. Rabbits in the southern Sudanian zone have the longest length (51.72 ± 4.17 cm for males and 52.37 ± 4.39 cm for females). Two types of rabbits are encountered, albino rabbits and non-albino rabbits. The coat can be agouti, single colored, silvered, variegated spotted or plated and multicolored. The patterns of the dress can be united, variegated, spotted or speckled. Almost all the rabbits studied have ordinary, normal, medium and soft ","PeriodicalId":9401,"journal":{"name":"Cameroon Journal of Experimental Biology","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76075298","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}