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Academic literature on the topic 'Écologie des savanes Côte d'Ivoire'
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Journal articles on the topic "Écologie des savanes Côte d'Ivoire"
Thomas, Annick Le, Laurent Aké Assi, and Laurent Ake Assi. "Flore de la Côte-d'Ivoire: Catalogue systématique, biogéographie et écologie." Taxon 51, no. 4 (2002): 831. http://dx.doi.org/10.2307/1555056.
Full textAcapovi, Geneviève L., Y. Yao, E. N'Goran, Mamadou Lamine Dia, and Marc Desquesnes. "Abondance relative des tabanidés dans la région des savanes de Côte d'Ivoire." Revue d’élevage et de médecine vétérinaire des pays tropicaux 54, no. 2 (2001): 109. http://dx.doi.org/10.19182/remvt.9788.
Full textBarima, Yao Sadaiou Sabas, Nicolas Barbier, Issouf Bamba, Dossahoua Traoré, Jean Lejoly, and Jan Bogaert. "Dynamique paysagère en milieu de transition forêt-savane ivoirienne." BOIS & FORETS DES TROPIQUES 299, no. 299 (2009): 15. http://dx.doi.org/10.19182/bft2009.299.a20419.
Full textAssi, Laurent Ake. "Les palmiers (Arecaceae): taxonomie, chorologie, écologie et les diverses utilisations traditionelles en Côte d'Ivoire." Giornale botanico italiano 129, no. 1 (1995): 481. http://dx.doi.org/10.1080/11263509509436165.
Full textCisse, Abdoulaye, Mevanly Ouattara, Estelle Anny N’guessan, and Joël Emmanuel N’Gouan Abrou. "Diversité végétale et usages des plantes dans une zone de savane soudanienne : Cas de la localité de Ferkessédougou (Nord, Côte d'Ivoire)." International Journal of Biological and Chemical Sciences 14, no. 8 (2020): 2807–25. http://dx.doi.org/10.4314/ijbcs.v14i8.13.
Full textKone, Hervé Cédessia Kéassemon, Nicaise Tetchi Akedrin, Vama Etienne Tia, Fatou Bayoko, and Lacina Fanlégué Coulibaly. "Qualités morpho-physiologiques et évaluation du comportement germinatif des graines du théier des savanes (Lippia multiflora Moldenke)." International Journal of Biological and Chemical Sciences 14, no. 6 (2020): 1988–98. http://dx.doi.org/10.4314/ijbcs.v14i6.5.
Full textKouonon, Léonie Clémence, Kouamé Guillaume Koffi, Koffi Adjoumani, Anouman Désirée Sandrine Mobio, and Koudougnon Alice Estère Goba. "Caractérisation phénotypique du néré (Parkia biglobosa (Jacq.) R. Br. ex G. Don, Fabaceae) dans trois types de savane de Côte d’Ivoire." International Journal of Biological and Chemical Sciences 14, no. 2 (2020): 555–69. http://dx.doi.org/10.4314/ijbcs.v14i2.20.
Full textCésar, Jean, Jérémy Bouyer, Laurent Granjon, Massouroudini Akoudjin, Laure Guerrini, and Dominique Louppe. "Les relictes forestières de la falaise de Banfora : un peuplement original au voisinage de Bobo-Dioulasso, Burkina Faso." BOIS & FORETS DES TROPIQUES 305, no. 305 (2010): 43. http://dx.doi.org/10.19182/bft2010.305.a20437.
Full textDissertations / Theses on the topic "Écologie des savanes Côte d'Ivoire"
N'Dri, Aya Brigitte. "Interaction termite-feu et dynamique de la végétation en savane (Lamto, Côte d'Ivoire)." Paris 6, 2011. http://www.theses.fr/2011PA066368.
Full textChérel, Guillaume. "Détection et abstraction de l'émergence dans des simulations de systèmes complexes : application à la savane de Côte d'Ivoire." Paris 6, 2013. http://www.theses.fr/2013PA066065.
Full textThe notion of emergence is at the core of complex systems science and concern philosophers and scientists. It is about those macroscopic properties, states, phenomena that we cannot explain, deduce or predict from the complete knowledge of their microscopic constituents. The context of this work is the conception of tools for the analysis of complex systems simulation. A literature review presents a panel of the definitions and conceptual problems of emergence. In particular, emergence is seen as the construction of a high level description of a complex system. The chapters of this thesis punctuate the path of constructing such a language. They talk about detecting emergence, visualising the traces of a complex system simulation, and studying the high level causal interactions. This last aspect was realised with a simulation study of a savanna model calibrated with data collected in the Lamto savanna in Côte d'Ivoire
Chevallier, Pierre. "Complexité hydrologique du petit bassin versant : exemple en savane humide, Booro-Borotou (Côte-d'Ivoire)." Montpellier 2, 1988. http://www.theses.fr/1988MON20221.
Full textZaidi, Zahia. "Recherches sur les modalités de l'interdépendance nutritionnelle entre vers de terre et microflore dans la savane guinéenne de Lamto (Côte d'Ivoire) : esquisse d'un système interactif." Paris 11, 1985. http://www.theses.fr/1985PA112229.
Full textThe geophagous species predominate within the Lumbricidae communities in the tropical savanna of Lamto (Ivory Coast). Their activity is momentous : 1000 T of earth pass through their digestive duct/ha/year, which is equivalent to a layer of 8. 6 cm. 30 T of castings are rejected at the surface, which shapes out a void amidst the sail equivalent to 35 m³/ha. In order to delineate the role of Millsonia anomala (Megascolecidae, Oligochaeta) in the soil compartment, samples brought to pF 2. 5 (14 %) were enriched in composts (1 %) bath aerobes and anaerobes of leaves and roots of Loudetia simplex. In vitro breeding showed the effect on the worms feeding of those different organic substrates. Whereas roots are a poor nutriment, leaves allow a thriwing growth, with notable differences according to the degree of compost maturation. Intake, indeed, increases when the nutritive quality of the latter decreases. Consequently, one supposes a conclusive role of the water-soluble fraction. To verify this hypothesis, sail was enriched, in another breeding series, with various doses of water-soluble extracts of Loudetia leaves. This assay confirms what had been laid out. The castings produced proved to be richer in water-soluble substances than the ingested sail, when this one is but little endowed. At the same time, their respiratory activity was more intense. The reverse is true when hydrosolubles are plentiful in the sail taken in. One construes that the worms draw their subsistence from the sail organic matter water-soluble fraction, which they work up jointly to the microbes. However, one observes all the stages between slackening and activation of the microflora, according to the conditions of the nutritional competition. Relations between wormsand microbes appear to be complex. Worms act upon the microflora, mainly by way of the mucus secreted, when the latter acts upon the worm by means of the water-soluble compounds born of its metabolic activity. Microbial activity, measured at the time of the moving on of the sail within the worms digestive duct, asserts the results obtained by means of the breedings. It reflects moreover the intervention of the sorptive capacity of the ingested mineral colloid, bath towards substrates and enzymes as well as microorganisms. Summing up, this investigation brings forth clues towards a better apprehension of the worms/microbes mutual system and yields ways and means to a modelisation of worm, organic matter and microbes interactions. These interdependency relations bear partly upon the tropical savanas fertility. Their study, therefore, delivers a key to a rational exploitation of that ecosystem's agricultural resources
Koffi, Kouamé Fulgence. "Impact du feu sur la démographie des Graminées de savane (Lamto, Côte d’Ivoire)." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS161.
Full textThe thesis aims to fill a lake of knowledge on the demography of perennial grasses in a humid savanna (Lamto). The impact of 4 fire treatments (early fire, mid-season fire, late fire and no fire) on the demography of the dominant perennial grasses was studied between 2015 and 2018 on sub-plots of 5 × 5 m and 5 × 10 m. Matrix models with 5 classes of circumference were used. Different responses of the species were observed. The circumference of the tussocks, varies between 3 cm and 156 cm. Fragmentation, retrogression, and fecundity increase with circumference as mortality and tussock growth decrease. Late fire causes more death, retrogression and fragmentation while mid-season fire promotes more growth and less retrogression. All species showed a growth rate λ <1 in late fire and no fire each year. The mid-season fire is advantageous to the growth of H. diplandra (λ = 1.02). The growth of A. canaliculatus was favored by early and mid-season fires (λ = 1.15 and λ = 1.04 respectively). Finally, A. canaliculatus and H. diplandra have the same ages and live longer under early fire (87 to 103 years). In the no fire, A. canaliculatus can reach 126 years. Overall, perennial grass species differ in their demographic parameters and their response to different fire regimes. The circumference of the tussocks is a determining parameter in the study of the demography of these grasses. The mid-season fire seems to be the most favorable for maintaining the diversity of the grasses at Lamto
Barima, Yao Sadaiou Sabas. "Dynamique, fragmentation et diversité végétale des paysages forestiers en milieux de transition forêt-savane dans le Département de Tanda, Côte d'Ivoire." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210234.
Full textNos résultats ont montré que l’équilibre écologique des forêts de la zone d’étude était fortement perturbé. L’agriculture itinérante sur brûlis, l’exploitation forestière et les feux de végétation ont été identifiés comme étant les principaux agents de ces dynamiques. La matrice du paysage, qui était initialement constituée d’une couverture continue de forêt dense, a été substituée par une mosaïque de savanes, de champs et de forêts exploitées, présentant des niveaux variables de dégradations anthropiques. L’utilisation de données multi-spectrales a permis de quantifier ces dégradations. Premièrement, sur base de l’information spectrale, nous avons distingué deux sous-types de forêts, différents entre eux en termes de densité, de composition, de stratégie dominante et de niveau de dégradation. Deuxièmement, une corrélation significative a été obtenue entre la dégradation et le degré de fragmentation des forêts, quantifiable à partir d’indices structuraux basés sur le nombre de taches, la proportion de forêts et le périmètre des taches forestières dans le paysage. La fragmentation semble avoir produit deux effets distincts sur la composition forestière ;elle détermine la taille et l’isolation des fragments aussi bien que les lisières forestières. Les dynamiques temporelles de la structure et de la composition du paysage forestier dans notre région d’étude a montré que la déforestation était plus sensible dans la partie Sud de la zone d’étude, en dépit du climat favorable, alors que dans la partie Nord, proche des savanes Guinéennes, la simulation des dynamiques à partir de la chaine de Markov a montré une tendance à la reprise forestière.
En définitive, notre étude a mis en évidence que la zone de transition forêt-savane étudiée était fortement dynamique. Dans une région où aucune réserve forestière n’existe réellement et où le front forestier régresse ou se dégrade rapidement, notre approche permet de poser les bases d’une politique rationnelle de protection des forêts, en établissant des seuils structuraux minimaux des fragments nécessaires à la préservation du biotope originel.
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Doctorat en Sciences
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Bruzon, Véronique. "Les savanes du nord de la Côte d'Ivoire, mésologie et dynamique : l'herbe, le feu et le pâturage." Paris 7, 1990. http://www.theses.fr/1990PA070024.
Full textLocated between 9 and 11e latitude north, the savannas of the northern ivory coast correspond to the sudanese area. The climatic gradient varies from west (1500mm) to east (1100mm). In the natural environment, there is a correlation between plant life and ecological conditions. As soon as man begins to exploit the environment, the resulting plant density is a product of different factors (agriculture, animal breeding, and hunting). Savannas are defined as grasslands, more or less sparsely scattered with trees and annually swept by fire. Most of the time, the savannas in this northern region are partially covered by bush or woodland. The net result is that three factors enter into the long term evolution of the savanna - the absence or presence of fire, the effect of animals, and that of agriculture. A three-year study deals with year-by-year variations in the density of ground cover. The herbaceous biomass depends mainly on the level of rainfall and its distribution in time and space, and, secondly, on soil characteristics (texture, nitrogen content). Two major factors affect this savanna: the duration of the dry season (3 to 7 months) and the annual passage of fire. With this factor, the herbaceous biomass variation is considerable because its density falls to 0. Yearly fires are essential for the perpetuation of plant life, both grass and trees. The herbaceous cover, consisting mostly of perennial grasses, constitute almost the entire food supply for the herds ---
Achi, Yaba Louise. "Le polyparasitisme gastro-intestinal des ruminants domestiques dans la région des savanes de la cote d'ivoire." Toulouse, INPT, 2004. http://www.theses.fr/2004INPT007A.
Full textDezetter, Alain. "Modélisation globale de la relation pluie débit : application en zone de savanes soudanaises (Nord-Ouest de la Côte-d'Ivoire)." Montpellier 2, 1991. http://www.theses.fr/1991MON20173.
Full textLe, Gall Philippe. "Spécificité trophique des Orthoptères acridomorpha d'une savane préforestière tropicale (Lamto, Rép. De Côte d'Ivoire) : contribution à l'étude de la niche écologique." Paris 11, 1986. http://www.theses.fr/1986PA112065.
Full textThe diet of 39 grasshoppers species from the tropical savanna (Located in Ivory Coast) is described thanks to the analysis of feculae contents. For some of them, as well as for the species studied (Humelen and Gillon, 1968), we calculate the breadth and the overlap of the trophic niches. For 7 representative species of the defined strategies, the daily consumption and the Coefficient of Digestive Utilization is measured. A review of literature will assess our knowledge as far as biochemical relations between grasshoppers and plants are concerned. Then, the different technics permitting to visualize osidases after proteins electrophoresis will be presented. The structure of Acridoidea community where diets were studied is described. The relations between spatial and trophic niche will be analyzed. A marking experiment will describe the sedentarity behaviour of Stenocrobylus festivus, a stenophagous species. The defensive strategies of grasshoppers towards their predators will be presented