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Registros recuperados: 37
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Agricultural and non-agricultural outputs and energy consumption in Tunisia: empirical evidences from cointegration and causality AgEcon
Chebbi, Houssem Eddine; Boujelbene, Y..
This short paper investigates the cointegration and causality link between energy consumption and agricultural, non-agricultural outputs (manufacturing sector and services sector) and overall gross domestic product in Tunisia for 1971-2003 period. Empirical results suggest that there is only unidirectional causality running from agricultural and non-agricultural sectors to energy consumption as well as from overall GDP growth to energy consumption. This unidirectional causality signifies a less energy dependent economy and suggests that it is sectoral growth that drives the energy consumption in Tunisia and not vice versa. Empirical results suggest also that Tunisian agricultural sector growth does not depend on energy, and high consumption of energy do...
Tipo: Conference Paper or Presentation Palavras-chave: Energy consumption; Output growth; Causality; Cointegration; Tunisia; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/44055
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Agricultural Sector and Economic Growth in Tunisia: Evidence from Co-integration and Error Correction Mechanism AgEcon
Chebbi, Houssem Eddine; Lachaal, Lassaad.
For the past two decades, Tunisia has been undertaken important structural reforms, which call in most cases for market and trade liberalization (agricultural structural adjustment program, GATT reforms, free trade area with the European Union). The private-led type of growth strategy with less government intervention has culminated these last years into a more rapid economic growth and openness. Within this context, this paper examines the agricultural sector role into the economic growth and its interactions with the other sectors using time-series co-integration techniques. We use annual data from 1961 to 2005 to estimate a VAR model that includes GDP indices of five sectors in Tunisian economy. Empirical results from this study indicate that in the...
Tipo: Conference Paper or Presentation Palavras-chave: Co-integration; Economic growth; Agricultural sector; Tunisia; International Development; C22; O13; Q18.
Ano: 2007 URL: http://purl.umn.edu/9416
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Agricultural Trade Liberalization and Poverty in Tunisia: Micro-simulation in a General Equilibrium Framework AgEcon
Chemingui, Mohamed Abdelbasset; Thabet, Chokri.
The study tries to answer the following questions: Will exposure to world agricultural prices generate more poverty or less? To what extent will households be affected by changes in agricultural trade polices? Do multilateral agricultural liberalization matter more than bilateral changes? Results of simulations using a computable general equilibrium (CGE) model linked to household survey data suggest that trade liberalization has only modest effects on the level of GDP, but it has a substantial effect in reducing poverty. Moreover, the combined effects of global and domestic liberalization are more pro-poor than the effect of domestic liberalization alone. As a net importer of agricultural commodities, Tunisia may be expected to experience terms-oftrade...
Tipo: Conference Paper or Presentation Palavras-chave: Tunisia; Agricultural trade liberalization; Poverty; International Relations/Trade.
Ano: 2008 URL: http://purl.umn.edu/44466
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Analyse typologique de la flottille chalutière du golfe de Gabès, Sud-Est de Tunisie OceanDocs
El Abed, A.; Jabeur, Ch.; Missaoui, H.; Gobert, R.; Jarboui, O..
Le golfe de Gabès est une pêcherie plurispécifique exploitée par plusieurs engins de pêche. Environ 75 % des chalutiers du pays opèrent dans cette zone. Les apports de la pêche au chalut (chalut de fond type crevettier et chalut de fond type méditerranéen) sont très diversifiés. Une analyse multivariée (Analyse en Composante Principale ACP suivie d'une classification ascendante hiérarchique) réalisée sur les captures des marées des chalutiers travaillant dans cette région a permis d'identifier onze (11) types d'activités: deux métiers pour les crustacés, deux métiers pour les céphalopodes, trois métiers pour la pêche des poissons, deux métiers regroupant la crevette, la seiche et les poissons et finalement deux métiers péchant les «divers»....
Tipo: Journal Contribution Palavras-chave: Typologie; Flottille; Golfe de Gabès; Tunisie; Chalutiers; ACP; Classification hiérarchique; Fleet; Tunisia; Trawlers; Pca; Cluster analysis. Fishing gear; Marine fisheries; Trawlers Fishery technology Fishing vessels.
Ano: 2000 URL: http://hdl.handle.net/1834/2072
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Assessment of sustainability in organic and conventional farms in Tunisia: The case of olive-growing farms in the region of Sfax AgEcon
Laajimi, Abderraouf; Ben Nasr, J.; Guesmi, Anis.
This research has been carried out to study the sustainability of the Tunisian olive-growing farms and to compare the sustainability level of organic with conventional farms. A survey was conducted with 62 olive growers in the region of Sfax in Tunisia. First, a diagnosis of the situation of the farms was undertaken comparing between organic and conventional farms. Second, an empirical analysis was achieved to asses the sustainability of organic farms versus conventional farms following the French “IDEA” method developed by Vilain [1] 1. The “IDEA” indicators showed a greater ranking for the organic farms. The analysis indicated the sustainability of organic farming on the three scales adopted; ecological scale, through the soil fertility and reduction of...
Tipo: Conference Paper or Presentation Palavras-chave: Sustainability; Organic farming; Tunisia; Environmental Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/44463
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Caractéristique de l’agriculture biologique en Tunisie: Cas des produits agroalimentaires bio Organic Eprints
Jaouadi, Imen.
l'Istituto Mediterraneo di Certificazione (IMC) a organisé le 23 et 24 mars 2005 deux journées d'études et de sensibilisation en collaboration avec l'ONUDI (Organisation des Nations Unis pour le Développement Industriel) et le CTAA (Centre Technique de l'Agroalimentaire). Les thèmes choisis sont liés aux potentialités du marché agroalimentaire Tunisien vis-à-vis du marché européen et des marchés internationaux 23 e 24 marzo, a Tunisi due seminari sull' agricoltura biologica e la rintracciabilità nell'aziende agricole e agrolaimentari in collaborazione con l' UNIDO e il CTTA (Centre Technique de l'Agroalimentaire) dal titolo “Les produits agroalimentaires Biologiques et les marchés internationaux” e “La mise en place des systèmes de traçabilité dans...
Tipo: Conference paper, poster, etc. Palavras-chave: Tunisia.
Ano: 2005 URL: http://orgprints.org/4793/1/4793.pdf
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Caractéritiques biométriques des Gobiidés (poissons téléostéens) de la lagune de l'Ichkeul OceanDocs
Chaouachi, B.; Ben Hassine, O.K..
خصائص القياس الإحيائي لسمك القبّان ببحيرة إشكل : تضمّ بحيرة إشكل ثلاثة أنواع من فصيلة القبان، Gobius niger وPomatoschistus microps وZosterisessor ophiocephalus وقد ألتقطت هذه الأسماك بشباك صيد خاصّة. وأدّت دراسة الخصائص الشّكليّة إلى تمييز هاته الأنواع المقيمة ببحيرة إشكل. وقد مكّننا تحليل الخاصيّات المرفومترية من تحديد التغييرات النسبيّة لمختلف أجزاء السّمكة. كما مكّنتنا دراسة العلاقة بين الطول والوزن عند الذكر والأنثى من مقارنة النمو النسبي عند الجنسين.
Tipo: Journal Contribution Palavras-chave: Tunisia; Ichkeul L. Animal morphology Biometrics Growth Growth Animal morphology http://aims.fao.org/aos/agrovoc/c_3394 http://aims.fao.org/aos/agrovoc/c_421.
Ano: 2001 URL: http://hdl.handle.net/1834/3796
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Characterization of <i>Artemia</i> from different localities in Tunisia with regard to their use in local aquaculture OMA
Van Ballaer, E.; Versichele, D.; Vanhaecke, P.; Léger, P.; Ben Abdelkader, N.; Turki, S.; Sorgeloos, P..
<i>Artemia</i> cysts have been collected from different saltworks and natural salt lakes in Tunisia. The cyst material was processed and used for the following characterization analyses: cyst and naupliar biometrics, cyst hatching characteristics, fatty acid pattern of the nauplii, nutritional value of the nauplii for mysid shrimp, naupliar growth rate and temperature resistance, mode of reproduction, and characterization of sibling species. The cross-breeding tests and cyst biometrics reveal that only <i>Artemia tunisiana</i> occurs in Tunisia. Although quality improvements may be expected through improved harvesting, Tunisian <i>Artemia</i> have acceptable hatching characteristics and are a good food for mysid shrimp....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artemia; Tunisia.
Ano: 1987 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3207
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CO2 emissions, energy consumption and economic growth in Tunisia AgEcon
Chebbi, Houssem Eddine; Boujelbene, Y..
The aim of this country specific study is to understand long and short-run linkages between economic growth, energy consumption and CO2 emission using Tunisian data over the period 1971-2004. Statistical findings indicate that economic growth, energy consumption and CO2 emission are related in the long-run and provide some evidence of inefficient use of energy in Tunisia, since environmental pressure tends to rise faster than economic growth. In the short run, results support the argument that economic growth exerts a positive “causal” influence on energy consumption growth. In addition, results from impulse response do not confirm the hypothesis that an increase in pollution level induces economic expansion. Although Tunisia has no commitment to reduce...
Tipo: Conference Paper or Presentation Palavras-chave: CO2 emissions; Energy Consumption; Economic Growth; Tunisia; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/44016
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Croissance relative, sex-ratio et exploitation de la crevette blanche metapenaeus monoceros (fabricius, 1798) du golfe de gabes (tunisie) OceanDocs
Jarboui, O.; Ben Abdallah, O.; Missaoui, H.; Ben Hadj Hamida, N..
Les crevettes, particulièrement Penaeus kerathurus, sont considérées parmi les espèces de crustacés les plus exploitées au niveau des côtes tunisiennes, essentiellement dans le golfe de Gabès. Depuis l’année 1993, une nouvelle espèce de crevette d’origine lesseptienne est apparue dans le golfe et s’est bien adaptée avec ses conditions climatiques et environnementales : c’est la crevette blanche Metapenaeus monoceros. L’objectif principal de cette étude consiste à suivre l’exploitation de cette espèce dans la région du golfe de Gabès, à étudier sa croissance relative et à déterminer la composition des captures selon le sexe. D’après les résultats obtenus nous avons pu constater que, durant la dernière décennie, la production de cette espèce dans le golfe de...
Tipo: Journal Contribution Palavras-chave: Crevettes; Espèces exotiques; Exploitation; Croissance; Shrimps MED; Tunisia; Gabes Gulf Metapenaeus monoceros Growth Introduced species Marine crustaceans Sex ratio Growth Sex ratio http://aims.fao.org/aos/agrovoc/c_3394 http://aims.fao.org/aos/agrovoc/c_7014.
Ano: 2003 URL: http://hdl.handle.net/1834/1076
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Decomposition of output growth in the Tunisian olive-growing sector: A frontier production function approach AgEcon
Dhehibi, Boubaker; Lachaal, Lassaad; Karray, B.; Chebil, Ali.
The aim of this paper is to investigate the relative contribution of technical efficiency, technological change and increased input use to the output growth of the Tunisian olive oil growing farms using a stochastic frontier production function approach applied to panel data for the period 1995- 1997. The proposed methodology is based on the use of a flexible translog functional form. Results indicate that technical efficiency of production in the sample of olive producing farms investigated ranges from a minimum of 24.8% to a maximum of 84.6% with an average technical efficiency estimate of 48.5%. This suggests that olive producers may increase their production by as much as 51.5% through more efficient use of production inputs. Further, the production is...
Tipo: Conference Paper or Presentation Palavras-chave: Olive oil sector; Tunisia; Productivity; Crop Production/Industries; Demand and Price Analysis.
Ano: 2006 URL: http://purl.umn.edu/10037
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Demand Analysis for Fish in Tunisia: An Empirical Approach AgEcon
Dhehibi, Boubaker; Lachaal, Lassaad; Chebil, Ali.
The aim of this paper is to analyze and determine the factors influencing fish demand in Tunisia during the 1975-2000 period. A Box-Cox transformation is used to select the appropriate functional form between linear and double-log models. Results indicate that the double-log form fits better the data and is used for the empirical analysis. Calculated elasticities from static model show that fish demand is price-inelastic and that fish can be considered as a normal good. However, the dynamic analysis using Houthakker-Taylor model suggests that fish consumption in Tunisia depends on consumers psychological-buying habits. Finally, the values of the short and the long-run elasticities indicate that per capita consumption of fish in Tunisia is growing, but at a...
Tipo: Conference Paper or Presentation Palavras-chave: Fish demand; Box-Cox transformation; Double-log model; Tunisia; Demand and Price Analysis; D12; C22.
Ano: 2005 URL: http://purl.umn.edu/24715
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Distribution spatiale de l'ichtyoplancton en été et en automne et conditions environnementales dans le golfe de Tunis OceanDocs
Romdhane, M.S.; El Abed, A.; Zarrad, R.; M’rabet, R.; Missaoui, H..
Pendant l’été et l’automne de l’année 2002, deux campagnes d’étude de l’ichtyoplancton ont été effectuées dans le golfe de Tunis. La température moyenne des eaux de surface a été de 25,51°c en été et 21,85°c en automne. Les œufs et les larves ont été plus abondants en été qu’en automne (360 œufs /10m² et 244 larves /10m² en été et 115 œufs /10m² et 174 larves /10m² en automne). Les paramètres environnementaux : température, salinité oxygène dissous, pH, chlorophylle a et abondance du mésozooplancton ne semblent pas avoir une influence directe sur la distribution spatiale de l’ichtyoplancton. Cependant, la bathymétrie semble avoir une influence sur cette distribution.
Tipo: Journal Contribution Palavras-chave: Mésozooplancton; Golfe de Tunis; Plankton; Zooplankton MED; Tunisia; Tunis Gulf Abundance Distribution Environmental factors Ichthyoplankton Zooplankton Distribution Environmental factors Zooplankton http://aims.fao.org/aos/agrovoc/c_35773 http://aims.fao.org/aos/agrovoc/c_2594 http://aims.fao.org/aos/agrovoc/c_15490.
Ano: 2003 URL: http://hdl.handle.net/1834/1075
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Donnees preliminaires sur les caracteres biometriques des anchois Engraulis encrasicolus (Linne, 1758) des cotes de Tunisie et du Lac Ichkeul ArchiMer
Quignard, J.p; Hamdouni, T; Zaouali, J.
Researchers have studied the number of rays in the dorsal and anal fins, the number of branchiospines and of vertebrae of the anchovies of the Tunisian coast. Regarding the number of vertebrae, the anchovies of the North West belong to the 'West Mediterranean' group and those of the North East and South East to the 'East Mediterranean' group, according to Fage's classification. The anchovies found in Lake Ishkeul are well individualised morphologically and biologically speaking and could be classified in the large group of the anchovies living in Mediterranean brackish waters; the number of their vertebrae is slightly inferior to that of the groups living in the neighbouring sea waters.
Tipo: Text Palavras-chave: Tunisia; Mediterranean sea; Geographical distribution; Anchovy; Vertebrae; Branchiospine; Biometry; Engraulis.
Ano: 1973 URL: http://archimer.ifremer.fr/doc/1973/publication-2162.pdf
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Effects of food prices and consumer income on nutrient availability: An application of the demand for dairy products in Tunisia AgEcon
Dhehibi, Boubaker; Laajimi, Abderraouf.
Number of Tunisian food demand studies have measured the influence of traditional variables, such as income and prices, and in some cases some socio-demographic variables. However, given increasing concerns about health, other important factors, such as the nutritious quality and the nutrient content of food, have also been shown to determine consumer choices. This paper analyses the effect of these factors on the demand for dairy products. The nutritious quality of dairy products is measured by an index that relates nutrient content of each product with the standards suggested by the National Academy of Science. A demand system is estimated and nutrient demand elasticities with respect to prices and expenditure are obtained. Results differ from...
Tipo: Journal Article Palavras-chave: Dairy products demand; Health awareness; Nutrients; Price/quality index; Tunisia; Agricultural and Food Policy; D12; I12.
Ano: 2009 URL: http://purl.umn.edu/57279
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EFFECTS OF SALINE WATER ON TOMATO UNDER SUBSURFACE DRIP IRRIGATION: NUTRITIONAL AND FOLIAR ASPECTS J. Soil Sci. Plant Nutr.
Kahlaoui,B; Hachicha,M; Rejeb,S; Rejeb,M.N; Hanchi,B; Misle,E.
A field experiment on the effects of drip irrigation (DI) and subsurface drip irrigation (SDI) with saline water (6.57 dS m-1) on three tomato cultivars (Lycopersicon esculentum Mill., cvs. Rio Tinto, Rio Grande and Nemador) was carried out with the purpose to quantify physiological responses. The aim was to improve irrigation water management under saline conditions of Tunisia. The trial was established in a silt-clayey soil with three regimes of irrigation: 100 %, 85 % and 70 % of crop water requirement. Results evidenced a significant difference between the two irrigation systems for the three cultivars. Growth parameters such as leaf area, chlorophyll content and mineral composition of leaves, petioles, stems and roots were affected significantly by...
Tipo: Journal article Palavras-chave: Salt tolerance; Tomato; Localized irrigation; Deficit irrigation; Tunisia.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000100007
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Effet du type de pâturage sur la qualité de la viande des agneaux élevés en mode biologique Organic Eprints
Hamdi, Hnia; Majdoub-Mathlouthi, Linda; Znaïdi, Ibrahim El-Akram; Aissa, Asma; Kraiem, Khemaes.
La réglementation de l’élevage ovin en mode biologique (MB) limite l’incorporation du concentré à un maximum de 40% avec un accès obligatoire au parcours. En Tunisie, la viande d’agneau de race Barbarine élevé sur parcours est reconnue par une meilleure qualité nutritionnelle (MajdoubMathlouthi et al., 2010). Néanmoins, la qualité du parcours est très dépendante de la pluviométrie, et il parait bien impératif de trouver d’autres types de pâturage pour réussir l’élevage en MB. L’objectif de cette étude était d’évaluer la qualité de la viande d’agneaux élevés sur deux types de pâturage: le parcours naturel et une prairie d’orge en vert.
Tipo: Conference paper, poster, etc. Palavras-chave: Feeding and growth; Sheep and goats; Tunisia.
Ano: 2012 URL: http://orgprints.org/35028/1/Effet%20du%20type%20de%20p%C3%A2turage%20sur%20la%20qualit%C3%A9%20de%20la%20viande%20des%20agneaux%20%C3%A9lev%C3%A9s%20en%20mode%20biologique.pdf
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Factors affecting farmers’ willingness to adopt salt-tolerant forage crops in south-eastern Tunisia AgEcon
Chebil, Ali; Nasr, Hafedh; Zaibet, Lokman.
This paper analyzed the factors that affect farmers’ willingness to adopt salt-tolerant forage for livestock, using a Tobit model. The data used for the empirical analysis was obtained from a survey of 97 farmers in southeastern Tunisia. The results of this study show that variables related to age, education level, the salinity level of water and membership in a farmers’ association do not significantly influence the degree to which salt-tolerant forage production is adopted. It did, however, find a positive relationship between off-farm income availability and adoption. In addition, the flock size variable, expressed in Standard Livestock Units, has a significant and positive relationship with adoption. This indicates farmers’ need to cover their forage...
Tipo: Journal Article Palavras-chave: Farmers’ willingness to adopt; Salt-tolerant forage; Tobit model; Tunisia; Crop Production/Industries.
Ano: 2009 URL: http://purl.umn.edu/56952
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First record of butyltin body burden and imposex status in Hexaplex trunculus (L.) along the Tunisian coast ArchiMer
Lahbib, Youssef; Abidli, Sami; Chiffoleau, Jean-francois; Averty, Bernard; El Menif, Najoua Trigui.
We have assessed for the first time the current status of tributyltin (TBT) contamination in Hexaplex trunculus along Tunisian coastal waters. Two sampling campaigns have been performed in July 2004 and July 2007 at seven different sites. The snails were analyzed for imposex status, i.e. Imposex incidence, Relative Penis Length Index (RPLI) and Vas Deferens Sequence Index (VDSI), followed by the quantification of butyltins in their tissues. Imposex was detected in six populations from the 2004 samples and in five populations from the 2007 samples. The imposex incidence ranged from 0 (no imposex) to 100%, the RPLI from 0 to 56.7 and the VDSI from 0 to 4.4. TBT was also detected in six populations in 2004 and five populations in 2007. The concentrations...
Tipo: Text Palavras-chave: Tunisia; Imposex; Hexaplex trunculus; TBT; Tributyltin.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6499.pdf
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Growth estimation of Merluccius merluccius off the northern coast of Tunisia ArchiMer
Khoufi, Widien; Dufour, Jean-louis; Jaziri, Hela; Elfehri, Safouene; Elleboode, Romain; Bellamy, Elise; Ben Meriem, Sadok; Romdhane, Mohamed Salah; Mahe, Kelig.
Growth parameters of any species are fundamental for biological or dynamic studies. The quality of the estimation for these parameters directly impacts on species stock assessment and, as a consequence, on fisheries management. In order to improve fishery and species stock management, growth analysis, especially by sex, is recommended. In this study, otoliths were used to estimate growth parameters of Merluccius merluccius Rafinesque, 1810. Hake is well-known as being a species in which otolith interpretation is extremely difficult. To estimate growth parameters, the first daily increment was validated as the tool for age determination. Otolith interpretation was done according to the last results of ICES cooperative research report. In total, a sample of...
Tipo: Text Palavras-chave: Merlucciidae; Merluccius merluccius; Tunisia; Western Mediterranean; Age estimation; Growth model; Otolith.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00191/30238/28662.pdf
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