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Registros recuperados: 29
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A multimetric-index approach using fisheries data to assess fish assemblage structure in relation to salinity gradient in a tropical West African estuary ArchiMer
Kantoussan, J.; Ecoutin, J. M.; Lae, R.; Thiaw, O. T.; Tito De Morais, L..
This study examines the effects of increasing salinity on fish assemblage structure in the Casamance Estuary, Senegal. using a series of indices. The study data were derived from commercial fishery surveys conducted between April and July 2005. Analysis of within-trophic-group diversity in the Casamance Estuary shows a significant drop in the diversity of apex predators in the upper. more saline reaches of the estuary. By contrast. primary consumers adapted well to salinity changes and exhibited higher taxonomic diversity in the upper reaches of the estuary than in the lower reaches. The findings also indicate decreases in average sizes of the landed species and the trophic levels among fish catches in the direction of the upper reaches. However, the catch...
Tipo: Text Palavras-chave: Biological indicators; Casamance Estuary; Ecosystem monitoring; Fishery statistics; Inverse hypersaline estuary; Senegal; Taxonomic diversity.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00451/56222/57945.pdf
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A note on an interesting association of the crab Platypodiella picta (A. Milne-Edwards 1869) and species of Zoantharia Naturalis
Hartog, J.C. den; Holthuis, L.B..
In the framework of the CANCAP-Project, a long-term oceanographic collecting program performed by the Rijksmuseum van Natuurlijke Historie, extensive shore collections were made from 1976 onwards on most of the Macaronesian Islands. During the collecting trips, a very ornamental crab, Platypodi ella picta (A.MILNE EDWARDS, 1869) was found on three occasions by the senior author. In addition the species was collected on the coast of Senegal. In all cases it was found associated with species of Zoantharia.
Tipo: Article / Letter to the editor Palavras-chave: Platypodi ella picta; Zoantharia; Crab; CANCAP; Rijksmuseum van Natuurlijke Historie; Macaronesian Islands; Senegal; 42.74.
Ano: 1984 URL: http://www.repository.naturalis.nl/record/460097
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A Participatory Modeling Process to Capture Indigenous Ways of Adaptability to Uncertainty: Outputs From an Experiment in West African Drylands Ecology and Society
d'Aquino, Patrick; CIRAD; daquino@cirad.fr; Bah, Alassane; UMISCO ESP UCAD Dakar; alassane.bah@gmail.com.
Over the centuries, local communities have shaped atypical rules to deal with the uncertainty of their environment. They have developed complex prototypes for flexible overlapping institutions and arrangements to adapt their rules and uses to their uncertain environment. Today, this indigenous way of flexibly institutionalizing access rules could provide blueprints for dealing with uncertainty issues resulting from global change as well as designing practical guidelines for implementing resilient management. However, transforming indigenous skills for developing institutional flexibility into operational management rules that are appropriate in the current environmental and socioeconomic context is a huge challenge. However, communities could easily...
Tipo: Peer-Reviewed Reports Palavras-chave: Environment; Indigenous knowledge; Management; Modeling; Participation; Sahel; Senegal; Uncertainty.
Ano: 2013
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Adapting Science to Adaptive Managers: Spidergrams, Belief Models, and Multi-agent Systems Modeling Ecology and Society
Lynam, Timothy; Tropical Resource Ecology Program, University of Zimbabwe; tlynam@science.uz.ac.zw; Bousquet, Francois; CIRAD Tera; bousquet@cirad.fr; Le Page, Christophe; CIRAD Tera; lepage@cirad.fr; d'Aquino, P.; CIRAD Tera; daquino@telecomplus.sn; Barreteau, Olivier; Cemagref Division Irrigation; barreteau@montpellier.cemagref.fr; Chinembiri, Frank C; Agritex;; Mombeshora, Bright; ;.
Two case studies are presented in which models were used as focal tools in problems associated with common-pool resource management in developing countries. In the first case study, based in Zimbabwe, Bayesian or Belief Networks were used in a project designed to enhance the adaptive management capacity of a community in a semiarid rangeland system. In the second case study, based in Senegal, multi-agent systems models were used in the context of role plays to communicate research findings to a community, as well as to explore policies for improved management of rangelands and arable lands over which herders and farmers were in conflict. The paper provides examples of the use of computer-based modeling with stakeholders who had limited experience with...
Tipo: Peer-Reviewed Reports Palavras-chave: Adaptive management; Bayesian belief networks; Developing country; Dynamic modeling; Multi-agent systems; Participatory modeling; Semiarid rangeland; Senegal; Spidergrams; Zimbabwe.
Ano: 2002
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Baitboat as a tuna aggregating device ArchiMer
Hallier, Jean-pierre; Delgado De Molina, A.
The original baitboat fishing technique using a permanent association between the fishing boat and the tuna school has been developed by the baitboat fleet of Dakar, Senegal and is also in use in the Canary Islands. This new fishing technique, the result of 20 years of improvements still on, has induced a dramatic increase of the catch yields which, in turn, has sustained the survival and even a recent development of the fleet. This technique is based on the aggregating behaviour of tropical tunas. However, it contains a dynamic component which is not found in tuna fishing on drifting or anchored fads. The specifications of the method, its refinement over the years and its main consequences for the fishery are described together with the school exchanges...
Tipo: Text Palavras-chave: Attracting techniques Bait fishing Pole-line fishing Tagging Tuna fisheries Article Geographic Terms: ASE; Atlantic; Canary Is. ASE; Mauritania ASE; Senegal.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00042/15304/12637.pdf
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Besoins en informations des grossistes pour une augmentation du volume des échanges en Afrique de l’Ouest. AgEcon
Reports (in French) on Stakeholders' Market Information Needs to Engage in Regional Trade. Mali
Tipo: Working or Discussion Paper Palavras-chave: Market information; Guinea; Mali; Senegal; Agriculture; Food security; Trade; Agricultural and Food Policy; Food Security and Poverty; International Relations/Trade; Marketing; Q17.
Ano: 2008 URL: http://purl.umn.edu/57264
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Cereal supplies in rural families of the Senegalese Groundnut Basin. Who is responsible for meeting family food needs ? AgEcon
Sakho-Jimbira, Maam Suwadu; Benoit-Cattin, Michel.
In the traditional operation of production-consumption groups in rural areas of Senegal, the group chief, or Borom njël, has a social duty to make sure family food needs are met. His ability to do this is supported by certain social rules governing these groups, and by a favourable environment. However, various changes have now adversely affected the environment. These changes prompted us to assess the Borom njel's current ability to go on playing his social rule as a food provider. From data collected in two villages of the Senegalese Groundnut Basin, using multivariate analysis, we identified three production-consumption group profiles according to how the Borom njel ensured main cereal supplies: (i) market purchase with migrants' remittances; (ii) home...
Tipo: Conference Paper or Presentation Palavras-chave: Senegal; Groundnut Basin; Cereal supplies; Consumption-production groups; Multinomial logit; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety.
Ano: 2007 URL: http://purl.umn.edu/7934
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Complexity in trophic structure and stability in a modelled West African estuary ArchiMer
Villanueva, Ching-maria; Diouf, P.s.; Albaret, J.-j.; Moreau, J..
Un modèle Ecopath de l'estuaire du Sine-Saloum (Sénégal) comportant au total 37 groupes fonctionnels a été appliqué dans la présente étude en vue de déterminer les faits essentiels de ce système aquatique. La grande biodiversité spécifique des poissons de l'écosystème peut y jouer un rôle en assurant son intégrité, spécialement en présence de facteurs de stress, bien qu'il ait été observé que ce n'est pas entièrement le cas. Les résultats montrent qu'un autre facteur de mitigation est le niveau des forces d'interaction entre les groupes fonctionnels. La stabilité est accrue par des relations plus faibles et des pyramides plus courtes et plus larges. Bien que différentes questions se posent concernant les facteurs conduisant à la stabilité d'un système, les...
Tipo: Text Palavras-chave: Stabilité des systèmes; Sénégal; Omnivorie; Estuaire; Ecosystème côtier; Ecopath; Biodiversité; Afrique de l'Ouest; West Africa; System Stability; Senegal; Omnivory; Estuary; Ecopath; Coastal Ecosystem; Biodiversity.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-2554.pdf
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Epidemiology of snakebites in Kédougou region (eastern Senegal): comparison of various methods for assessment of incidence and mortality J. Venom. Anim. Toxins incl. Trop. Dis.
Lam,Absa; Camara,Bouna; Kane,Oumar; Diouf,Amadou; Chippaux,Jean-Philippe.
Abstract Background Although considered a public health issue in Senegal, the actual incidence and mortality from snakebite are not known. In the present study, an epidemiological survey was carried out in Kédougou region, southeastern Senegal, where envenomations, particularly by Echisocellatus, are frequent and severe. Methods Three sources of data were used: records from health centers and reports by health professionals; traditional healers; and household surveys. Results The annual incidence and mortality provided by health centers were 24.4 envenomations and 0.24 deaths per 100,000 population, respectively. The annual incidence recorded by traditional healers was 250 bites per 100,000 inhabitants, but the number of deaths was unknown. Finally,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Epidemiology; Snakebite; Envenomation; Senegal; Incidence.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992016000100307
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Etude sur la transmission des fluctuations et le calcul des prix de parité à l’importation: cas pratique du riz et du maïs au Sénégal AgEcon
Ndiaye, Mouhamadou; Niang, Moussa.
Calculation of maize and rice parity prices in Senegal.
Tipo: Working or Discussion Paper Palavras-chave: Food security; Senegal; Markets; Parity prices; Agricultural and Food Policy; Community/Rural/Urban Development; Food Security and Poverty; International Development; Marketing; Q11; Q18.
Ano: 2010 URL: http://purl.umn.edu/62166
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Etude sur les besoins en information des operateurs (importateurs/exportateurs) et des moyens de dissémination. Senegal. AgEcon
Reports (in French) on Stakeholders' Market Information Needs to Engage in Regional Trade. Senegal
Tipo: Working or Discussion Paper Palavras-chave: Market information; Senegal; Agriculture; Food security; Trade; Agricultural and Food Policy; Food Security and Poverty; International Relations/Trade; Marketing; Q17.
Ano: 2008 URL: http://purl.umn.edu/57266
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Etudes environnementales OceanDocs
SOFRECO; TROPICA
Tipo: Report Palavras-chave: Senegal; Fishery organizations; PAPA SUD; Fishery management; Fishery regulations; Environments.
Ano: 2003 URL: http://hdl.handle.net/1834/768
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Horticultural Households Profit Optimization and the Efficiency of Labour Contract Choice AgEcon
Ndoye Niane, Aifa Fatimata; Burger, Kees; Bulte, Erwin H..
In agriculture, the coexistence of different forms of land tenancy or labour contract has been explained so far by several theories related to Marshallian inefficiency, incentives, risk sharing, and transaction costs, including supervision costs. These theories and the empirical evidences have greatly contributed to explain the reasons behind land tenancy or labour contract choice. This study follows up on this. Moreover, it intends to take a further step by focusing particularly on the production technologies at plot level, and by designing and testing a theoretical model based on household profit optimization. This model will take into account the supervision costs of labour (i) to compare optimum profit derived from plots based on household labour, a...
Tipo: Journal Article Palavras-chave: Land tenancy; Labour; Sharecropping; Wage; Contract; Supervision; Household; Profit optimization; Efficient; Irrigation equipment; Horticulture; Senegal; Agricultural Finance.
Ano: 2010 URL: http://purl.umn.edu/95776
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Household Resources Allocation, Gender, and Economic Performance: Empirical Evidence from Senegal, West Africa AgEcon
Ndoye Niane, Aifa Fatimata.
This paper has examined Pareto efficiency of household resources allocation and the appropriateness to use gender-specific models rather than unitary model while investigating economic performance of men and women managers of separate plots within horticultural households in Senegal, West Africa. This paper contributes to the gender and economics literature providing empirical evidence of intrahousehold resources allocation in a specific social, economic and cultural context in which polygamy occurs and where husband and wives manage separately their plots. The findings confirm the suitability of gender-specific models to shed light on the gender differential of performance. As the subject matter is efficiency, as well in econometric as in economic point...
Tipo: Conference Paper or Presentation Palavras-chave: Household Resources Allocation; Gender; Economic Performance; Horticulture; Senegal; Agricultural and Food Policy; Crop Production/Industries; Production Economics; Productivity Analysis; D2.
Ano: 2009 URL: http://purl.umn.edu/50902
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Local diversification of income sources versus migration: Complements or Substitutes? Evidence from rural families of the Senegalese Groundnut Basin AgEcon
Sakho-Jimbira, Maam Suwadu; Bignebat, Celine.
Much has been written to show the importance of diversification for rural African households because of the considerable share of non-farm revenues in total income (Reardon, 1997; Reardon et al., 1998). The literature points out push and pull factors explaining that risk and adverse shocks which characterize farm activities urge rural population to diversify into more profitable non-farm activities. But less attention has been paid to the distinction between two diversification patterns, namely local diversification and migration, and their relationship. Drawing on the theoretical and empirical literature, we identify the advantages and drawbacks of local diversification versus migration decision in terms of expected pay-offs for the family and the...
Tipo: Conference Paper or Presentation Palavras-chave: Migration; Diversification; Mutual insurance; Groundnut basin; Senegal; Consumer/Household Economics; O15; O55; D70; Q12.
Ano: 2007 URL: http://purl.umn.edu/7918
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Observations sur le captage et la croissance de l'huitre creuse ouest-africaine, Crassostrea gasar , en Casamance, Senegal ArchiMer
Gilles, S.
The study was carried out at two sites, the island of Carabane, near the ocean, and the village of Djivent, 60 km by water-way from the mouth of the Casamance River. On the first site, the rise of water temperature commands the spat fall from March to October with a maximum peak in July. Because of a heavy biological competition, oysters can only survive within the intertidal zone. On the second site from August to November, which corresponds with the end of the rainy season, the decrease of salinity induces spawning and settlement of young oysters. Because of the heavy salinity variations there is a weak biological competition and young oyster can easily survive in permanent immersion as within the intertidal zone. On both sites, the growth is linear but...
Tipo: Text Palavras-chave: ASE; Senegal; Casamance Crassostrea gasar Bivalvia Seed collection Spat Growth Oyster culture.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-919.pdf
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Platypodiella georgei spec. nov. (Brachyura: Xanthidae), a new crab from the island of St. Helena, South Atlantic Ocean, with notes on the genus Platypodiella Guinot, 1967 Naturalis
Hartog, J.C. den; Türkay, M..
A new species of Platypodiella Guinot, 1967, from the island of St. Helena, P. georgei spec, nov., is described. This species was found associated with encrusting species of Palythoa Lamouroux, 1816 (Zoantharia). Ample evidence is presented that both the eastern Atlantic P. picta (A. Milne-Edwards, 1869) and the western Atlantic P. spectabilis (Herbst, 1794) also live habitually associated with encrusting species of Palythoa, rarely with other zoantharians. For each of the two East-Pacific members of the genus, P. rotundata (Stimpson, 1860) and P. gemmata (Rathbun, 1902), there is at least one rather detailed published record suggesting that these species too associate with Palythoa. Thus, this habit would seem to go for all five members of the genus. Data...
Tipo: Article / Letter to the editor Palavras-chave: Crustacea; Brachyura; Xanthidae; Platypodiella; Association; Zoantharia; Palythoa; Atlantic Ocean; St. Helena; Cape Verde Islands; Senegal; Eastern Caribbean; 42.74.
Ano: 1991 URL: http://www.repository.naturalis.nl/record/318097
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Recensement des besoins d’information des opérateurs économiques pour une augmentation du volume des échanges entre la Guinée, le Mali, le Niger et le Sénégal AgEcon
Reports (in French) on Stakeholders' Market Information Needs to Engage in Regional Trade. Guinea
Tipo: Working or Discussion Paper Palavras-chave: Market information; Guinea; Mali; Senegal; Agriculture; Food security; Trade; Agricultural and Food Policy; Food Security and Poverty; Marketing; Q17.
Ano: 2008 URL: http://purl.umn.edu/57263
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Relatório de viagem ao Senegal, Cabo Verde, Argélia e Tunísia. Infoteca-e
SIMÕES, A. J.; MIRANDA, E. E..
O objetivo da viagem foi visitar e acompanhar os programas de pesquisa agropecuária. do Senegal, Cabo Verde, Argélia e Tunísia.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: Cabo verde; Argélia; Relatório de viagem; Senegal; Tunisia.
Ano: 1982 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133408
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Répartition des foraminifères benthiques actuels sur le plateau continental sénégalais au sud de Dakar ArchiMer
Redois, F; Debenay, Jp.
Two hundred and twenty four benthic foraminiferal species were recognized in the total assemblages of fifty samples collected from the Senegalese continental shelf south of Dakar (down to a depth of 200 m). A factor analysis based on nineteen dominant species shows three main factors. The first two seem to be associated with temperature and its seasonal variations; they are depth-related and determine two main faunal changes. The third factor is substrate-related. The main depth-related species are: i) Cribrononion gerthi, Quinqueloculina akneriana, Quinqueloculina lamarckiana, Cribrolinoides curtus, Elphidium fichtellianum and Textularia sagittula in th coastal zone; ii) Discorbinella bertheloti, Cancris aff. C. sagrum, Textularia truncata, Nonion fabum,...
Tipo: Text Palavras-chave: Foraminifère actuel; Plateau continental; Atlantique; Sénégal; Recent foraminifer; Continental shelf; Atlantic; Senegal.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00325/43622/43920.pdf
Registros recuperados: 29
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