Consulta: subjectFacets:"Tunisia"
Registros recuperados: 39
Data/hora: 07/06/2024 09:18:13

Relatório de viagem ao Senegal, Cabo Verde, Argélia e Tunísia.
Provedor de dados: 14
Autores: 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

First record of butyltin body burden and imposex status in Hexaplex trunculus (L.) along the Tunisian coast
Provedor de dados: 5
Autores: 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

Growth estimation of Merluccius merluccius off the northern coast of Tunisia
Provedor de dados: 5
Autores: 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

Étude du régime alimentaire de l’ichtyofaune du lac ichkeul (Tunisie)
Provedor de dados: 5
Autores: Shaiek, Moez; Romdhane, Mohamed Salah; Le Loc'H, Francois.
In order to define the structure of trophic network of Ichkeul Lake in Tunisia, diet of main teleost fish species was determined during two seasons, wet and dry. A total of 491 stomachs from 16 teleost species was analyzed. The analysis revealed spatial variability (East under marine influence and West with more continental effect) and temporal one (wet and dry seasons). Based on stomach contents, nine trophic groups were revealed, including eight monospecific groups. The main prey are mudflat snails (Hydrobia ventrosa, H. acuta), bivalves (Abra alba, Cerastoderma glaucum), amphipods and isopods, as well as seagrass (Potamogeton pectinatus, Ruppia cirrhosa) and water brackish algae (Ulva spp. and Chaetomorpha spp., Cladophora sp., Polysiphonia sp.).
Tipo: Text
Palavras-chave: Ichthyofauna; Tunisia; Ichkeul Lake; Stomach contents; Prey; Diet; Trophic group.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00294/40541/73188.pdf

Phylogeographic study of the dwarf oyster, Ostreola stentina, from Morocco, Portugal and Tunisia: evidence of a geographic disjunction with the closely related taxa, Ostrea aupouria and Ostreola equestris
Provedor de dados: 5
Autores: Lapegue, Sylvie; Ben Salah, Ines; Batista, Frederico; Heurtebise, Serge; Neifar, L; Boudry, Pierre.
Despite the economic importance of oysters due to the high aquaculture production of several species, the current knowledge of oyster phylogeny and systematics is still fragmentary. In Europe, Ostrea edulis, the European flat oyster, and Ostreola stentina, the Provence oyster or dwarf oyster, are both present along the European and African, Atlantic and Mediterranean, coasts. In order to document the relationship not only between O. stentina and O. edulis, but also with the other Ostrea and Ostreola species, we performed a sequence analysis of the 16S mitochondrial fragment (16S rDNA: the large subunit rRNA-coding gene) and the COI fragment (COI: cytochrome oxidase subunit I). Oysters were sampled from populations in Portugal (two populations), Tunisia...
Tipo: Text
Palavras-chave: Tunisia; Portugal; Marocco; Ostreola stentina; Ostreola equestris; Ostrea aupouria; Phylogeographic study.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1912.pdf

Donnees preliminaires sur les caracteres biometriques des anchois Engraulis encrasicolus (Linne, 1758) des cotes de Tunisie et du Lac Ichkeul
Provedor de dados: 5
Autores: 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

EFFECTS OF SALINE WATER ON TOMATO UNDER SUBSURFACE DRIP IRRIGATION: NUTRITIONAL AND FOLIAR ASPECTS
Provedor de dados: 126
Autores: 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

Caractéritiques biométriques des Gobiidés (poissons téléostéens) de la lagune de l'Ichkeul
Provedor de dados: 20
Autores: 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

Croissance relative, sex-ratio et exploitation de la crevette blanche metapenaeus monoceros (fabricius, 1798) du golfe de gabes (tunisie)
Provedor de dados: 20
Autores: 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

Analyse typologique de la flottille chalutière du golfe de Gabès, Sud-Est de Tunisie
Provedor de dados: 20
Autores: 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

Régime alimentaire de symphodus (Crenilabrus) ocellatus des côtes sud de la Tunisie
Provedor de dados: 20
Autores: Bouain, A.; Ouannes-Ghorbel, A.; Jarboui, O.; M’rabet, R.
Symphodus (Crenilabrus) ocellatus of the Tunisian southern Gabes coasts feeds on the small bentic invertebrates of shallow medowe bed. The preferential preys of this Labridae fish are crustaceans and mollusces. Trophic variations of this fish by seasons show its specific adaptive response to changes in environment.
Tipo: Journal Contribution
Palavras-chave: MED; Tunisia; South coast; Régime alimentaire; Crustacés; Mollusques; Côtes sud de la Tunisie Symphodus ocellatus Labridae Diets Food organisms Prey selection Shellfish Zoobenthos Shellfish Zoobenthos http://aims.fao.org/aos/agrovoc/c_7033 http://aims.fao.org/aos/agrovoc/c_15487.
Ano: 2003
URL: http://hdl.handle.net/1834/1074

Distribution spatiale de l'ichtyoplancton en été et en automne et conditions environnementales dans le golfe de Tunis
Provedor de dados: 20
Autores: 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

Période de ponte, sex-ratio et maturité sexuelle de &lt;Dentex Maroccanus&gt;  (Teleostei, Sparidae) des côtes Tunisiennes
Provedor de dados: 20
Autores: Chemmam Abdelkader, B.; Kraiem, M.M.; El Abed, A.
L’étude de la période de ponte, de l'âge et de la taille de première maturité sexuelle du Denté  &lt;Dentex maroccanus&gt; a été réalisée pour la première fois sur les côtes tunisiennes. La  période  de frai pour cette espèce se situe entre juillet  et octobre. L'étude de la sex-ratio par saison et par classe de taille montre en général une dominance des femelles par rapport aux mâles qui s’inverse en faveur de ces derniers pendant la période de frai (juin- août) et ceci  pour les grandes classes de taille (supérieures à 18 cm).  Le calcul du pourcentage des individus matures par classe de taille et par sexe, nous a permis de déterminer la taille de première maturité sexuelle. La valeur estimée de L50 (50% de matures) des deux sexes correspond à une...
Tipo: Journal Contribution
Palavras-chave: Sexual maturity Spawning seasons Sparidae Dentex Maturité sexuelle Période de fraie Dentex Côtes Tunisiennes Med; Tunisia; Coast.
Ano: 2002
URL: http://hdl.handle.net/1834/182

Characterization of &lt;i&gt;Artemia&lt;/i&gt; from different localities in Tunisia with regard to their use in local aquaculture
Provedor de dados: 27
Autores: Van Ballaer, E.; Versichele, D.; Vanhaecke, P.; Léger, P.; Ben Abdelkader, N.; Turki, S.; Sorgeloos, P.
&lt;i&gt;Artemia&lt;/i&gt; 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 &lt;i&gt;Artemia tunisiana&lt;/i&gt; occurs in Tunisia. Although quality improvements may be expected through improved harvesting, Tunisian &lt;i&gt;Artemia&lt;/i&gt; 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

Effet du type de pâturage sur la qualité de la viande des agneaux élevés en mode biologique
Provedor de dados: 21
Autores: 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

Organics Olympiad 2016: Global Indices of Leadership in Organic Agriculture
Provedor de dados: 21
Autores: Paull, John.
Organic production (including agriculture, wild culture, forestry and aquaculture) is a worldwide phenomenon that is practiced in at least 172 countries. The Organics Olympiad presents 14 indices of global organics leadership, each at three levels (Gold, Silver and Bronze). The Organics Olympiad of 2016 yields 29 countries as global organics leaders, and confirms that organics leadership is diversely distributed across countries, large and small, rich and poor, developed and less so, and cuts across linguistic, ethnic and cultural boundaries. Australia continues to lead the world in organic agriculture hectares. Australia also leads in the increase of organic hectares over the past four years (since the Organics Olympiad 2012) and in the number of WWOOF...
Tipo: Journal paper
Palavras-chave: Farming Systems; Food systems; Africa; Asia; Australia; China; Denmark; European Union; Finland; France; India; Italy; Latin America; Lithuania; Switzerland; Tunisia; United States; World; Knowledge management; Europe; Germany; Mexico.
Ano: 2016
URL: http://orgprints.org/30369/1/Paull2016.OlympiadJSDS.pdf

Caractéristique de l’agriculture biologique en Tunisie: Cas des produits agroalimentaires bio
Provedor de dados: 21
Autores: 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

Demand Analysis for Fish in Tunisia: An Empirical Approach
Provedor de dados: 31
Autores: 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

Technical efficiency of olive oil manufacturing and efficacy of modernization programme in Tunisia
Provedor de dados: 31
Autores: Kashiwagi,   Kenichi; Mtimet,   Nadhem; Zaibet,   Lokman; Nagaki,   Masakazu.
This study investigates firm level technical efficiency of production and its determinants in a sample of 137 olive oil manufacturing firms in Tunisia using a stochastic frontier production model applied to cross-section data. Results indicate that technical efficiency of production in the sample of olive oil manufacturing firms investigated ranges from a minimum of 47.1% to a maximum 99.5% with an average technical efficiency estimate of 86.5%. This implies olive oil manufacturing firms in Tunisia can increase their production on average by 13.5% through more efficient use of technology and production inputs. The fact that 93 firms represented more than 64.4% of the sample hit more than 80% of technical efficiency score implies the efficacy of...
Tipo: Journal Article
Palavras-chave: Olive oil manufacturing; Stochastic frontier production function; Technical efficiency; Modernization programme; Tunisia; Crop Production/Industries.
Ano: 2010
URL: http://purl.umn.edu/96195

Agricultural and non-agricultural outputs and energy consumption in Tunisia: empirical evidences from cointegration and causality
Provedor de dados: 31
Autores: 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

Measuring Irrigation Water Efficiency with a Stochastic Production Frontier: An Application for Citrus Producing Farms in Tunisia
Provedor de dados: 31
Autores: Dhehibi,   Boubaker; Lachaal,   Lassaad; Elloumi,   Mohamed; Messaoud,   Emna B.
The objective of this paper is to propose an alternative measure of irrigation water efficiency based on the concept of input- specific technical efficiency, which contracts with measures previously used in the literature. The proposed methodology is applied to a randomly selected sample of 144 citrus growing farms located in Nabeul (Tunisia). A stochastic production frontier approach, based on Battese and Coelli’s (1995) inefficiency effect model, is used to obtain farm-specific estimates of technical and irrigation water efficiency. In addition, a second-stage regression approach is used to identify the factors influencing irrigation water efficiency differentials across citrus growing farms. Results indicate that technical efficiency ranges from a...
Tipo: Conference Paper or Presentation
Palavras-chave: Citrus; Efficiency; Tunisia; Water; Agricultural and Food Policy; Community/Rural/Urban Development; Demand and Price Analysis; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; International Relations/Trade; Marketing; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies.
Ano: 2008
URL: http://purl.umn.edu/52166

CO2 emissions, energy consumption and economic growth in Tunisia
Provedor de dados: 31
Autores: 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

Agricultural Sector and Economic Growth in Tunisia: Evidence from Co-integration and Error Correction Mechanism
Provedor de dados: 31
Autores: 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

Investigating linkages between economic growth, energy consumption and pollutant emissions in Tunisia
Provedor de dados: 31
Autores: Chebbi,   Houssem Eddine.
The aim of this study is to understand long and short-run linkages between economic growth, energy consumption and carbon emission using Tunisian data over the period 1971-2004. Cointegration procedure is used to analyze the time series properties of the series and error-correction terms were considered to test for the direction of Granger causality. 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. The short-run analysis, provide support for causality running from CO2 emissions growth to output growth, both in the short-run and the long-run. The results...
Tipo: Conference Paper or Presentation
Palavras-chave: Pollutant emissions; Economic growth; Cointegration; Causality; Tunisia; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/50944

Measurement and Sources of Technical Inefficiency in the Tunisian Citrus Growing Sector
Provedor de dados: 31
Autores: Dhehibi,   Boubaker; Lachaal,   Lassaad; Elloumi,   Mohamed; Messaoud,   Emna B.
This paper investigates farm level technical inefficiency of production and its determinants in a sample of 150 citrus producing farms in Tunisia using a stochastic frontier production function approach applied to cross section data. Results indicate that technical efficiency of production in the sample of citrus producing farms investigated ranges from a minimum of 26.84% to a maximum of 97.98% with an average technical efficiency estimate of 86.23%. This suggests that citrus producers may increase their production by as much as 13.77% through more efficient use of production inputs. Further, the estimated coefficients in the technical inefficiency model indicate the positive effect on technical efficiency of the share of productive trees, the...
Tipo: Conference Paper or Presentation
Palavras-chave: Technical Efficiency; Stochastic frontier production function; Citrus farms; Tunisia; Productivity Analysis.
Ano: 2007
URL: http://purl.umn.edu/9391

Agricultural Trade Liberalization and Poverty in Tunisia: Micro-simulation in a General Equilibrium Framework
Provedor de dados: 31
Autores: 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

Stochastic Production Frontiers and Decomposition of Output Growth: The case of citrus-growing farms in Tunisia
Provedor de dados: 31
Autores: Dhehibi,   Boubaker; Elloumi,   Mohamed.
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 citrus growing farms using a stochastic frontier production function approach applied to panel data for the period 2003-2005. Knowledge of the relative contribution of factors productivity and input use to output growth and improvements in technical efficiency is crucial to provide a comprehensive view of the state of the citrus producing sector in the country and help farm managers and policy makers draw appropriate policy measures. The proposed methodology is based on the use of a flexible translog functional form. Results indicate that technical efficiency of production in citrus...
Tipo: Conference Paper or Presentation
Palavras-chave: Citrus sector; Tunisia; Productivity; Technical change; Technical efficiency.; Crop Production/Industries; Productivity Analysis; Q12; O30; O47.
Ano: 2009
URL: http://purl.umn.edu/49953

Factors affecting farmers’ willingness to adopt salt-tolerant forage crops in south-eastern Tunisia
Provedor de dados: 31
Autores: 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

Input, Output Technical Efficiencies and Total Factor Productivity of Cereal Production in Tunisia
Provedor de dados: 31
Autores: Dhehibi,   Boubaker; Bahri,   Haithem; Annabi,   Mohamed.
In this paper, farm level technical efficiency of production and its determinants are investigated in a sample of 51 cereal producing farms located in the main cereal production region in Tunisia using a stochastic frontier production model.   Empirical findings show that labor input factor appears with a minimal effect on the production. The hypothesis of constant returns to scale is rejected at the 5% level of significance, and returns to scale were found to be decreasing. Moreover, the estimated coefficients in the technical inefficiency model are also as expected. The estimated coefficients of the instruction level of farmer and the rotation, technical variable, are negatives and statistically significant at 5% level, which indicates their positive...
Tipo: Presentation
Palavras-chave: Technical efficiency; Timmer index; Kopp index; TFP; Cereal farms; Tunisia; Agricultural and Food Policy; Farm Management; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods; C43; O47; Q12.
Ano: 2012
URL: http://purl.umn.edu/122866

Measuring irrigation water use efficiency using stochastic production frontier: An application on citrus producing farms in Tunisia
Provedor de dados: 31
Autores: Dhehibi,   Boubaker; Lachaal,   Lassaad; Elloumi,   Mohamed; Messaoud,   Emna B.
This paper proposes an alternative measure of irrigation water efficiency based on the concept of input-specific technical efficiency. It uses a stochastic production frontier approach, based on Battese and Coelli’s (1995) inefficiency effect model, to obtain farm-specific estimates of technical and irrigation water efficiency, and a second-stage regression approach to identify the factors that influence irrigation water efficiency differentials. This methodology was applied to a sample of 144 citrus farms in Nabeul, Tunisia. Technical efficiency varies widely, suggesting that these citrus farmers could increase their production by as much 33% by using inputs more efficiently. Mean irrigation water efficiency is similarly variable, and on average below...
Tipo: Journal Article
Palavras-chave: Water efficiency; Stochastic frontier production function; Citrus farms; Tunisia; Resource /Energy Economics and Policy.
Ano: 2007
URL: http://purl.umn.edu/57013

Decomposition of output growth in the Tunisian olive-growing sector: A frontier production function approach
Provedor de dados: 31
Autores: 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

Tunisian agriculture: Are small farms doomed to disappear?
Provedor de dados: 31
Autores: Jouili,   Mustapha.
In Tunisia, small and medium-sized family farms dominate agriculture. From the early 80s, with the introduction of the Structural Adjustment Program (SAP), the conditions of production and reproduction of small farms have radically changed. In addition to the unfavorable trend of the prices, these farms are increasingly excluded from credit, land and support services. The ultimate consequence is a tendency in real incomes to decline, particularly sharp for small farms in the arid regions of the country. Faced with this degradation, small farms have developed mechanisms of adaptation or regulation allowing them to survive and, even in certain cases, to ensure more than a simple reproduction. But, it seems that the limits of these mechanisms of resistance...
Tipo: Conference Paper or Presentation
Palavras-chave: Agriculture; Agricultural policy; Small farms; Tunisia; Agricultural and Food Policy; Consumer/Household Economics; Q10; Q12; Q18.
Ano: 2009
URL: http://purl.umn.edu/52816

Productive Efficiency in Water Usage: An Analysis of Differences among Citrus Producing Farms Sizes in Tunisia
Provedor de dados: 31
Autores: Dhehibi,   Boubaker.
The objective of this paper is to measure productive efficiency of irrigation water efficiency based on the concept of technical efficiency and compared among different sizes farms in Tunisia. The proposed methodology is applied to a randomly selected sample of 144 citrus growing farms and differentiated by size (small, medium and large farms). A stochastic production frontier approach, based on Battese and Coelli’s (1995) inefficiency effect model, is used to obtain farm-specific estimates of technical and irrigation water efficiency. The last step of the analysis consists on the identification of the factors influencing irrigation water efficiency differentials across citrus growing farms. Empirical results show that estimated mean technical efficiency...
Tipo: Conference Paper or Presentation
Palavras-chave: Water Efficiency; Stochastic frontier production function; Small; Medium and large citrus farms; Tunisia; Crop Production/Industries.
Ano: 2011
URL: http://purl.umn.edu/114441

Productivity and Economic Growth in Tunisian Agriculture: An Empirical Evidence
Provedor de dados: 31
Autores: Dhehibi,   Boubaker; Lachaal,   Lassaad.
This paper analyse the patterns of productivity and economic growth in the Tunisian agriculture during the 1961–2000. Results indicated that agriculture output growth where high in both the 1961–1970 and the 1971–1980 periods but decreased during the 1991–2000 period. Average output growth exceeded 6% during the 1981–1990 period, the average output growth during 1991–2000 had fallen to 4%. Over the whole period, capital was the most important contributor to output growth and labour is considered as the least significant contributor to economic growth. Total factor productivity contribution to output growth decreased from 4.64% in 1961–1970 to 2.86% in 1971–1980. In contrast, this contribution increased in 1981-1990 to close the 4.38%. In the last period,...
Tipo: Conference Paper or Presentation
Palavras-chave: Production function; Translog; Agriculture; TFP; Tunisia; International Development; Productivity Analysis; C8; O13; O14.
Ano: 2006
URL: http://purl.umn.edu/25707

Effects of food prices and consumer income on nutrient availability: An application of the demand for dairy products in Tunisia
Provedor de dados: 31
Autores: 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

Productive Efficiency in Water Usage: An Analysis of Differences among Citrus Producing Farms Sizes in Tunisia
Provedor de dados: 31
Autores: Dhehibi,   Boubaker.
The objective of this paper is to measure productive efficiency of irrigation water efficiency based on the concept of technical efficiency and compared among different sizes farms. The proposed methodology is applied to a randomly selected sample of 144 citrus growing farms located in Nabeul (Tunisia) and differentiated by size (small, medium and large farms). A stochastic production frontier approach, based on Battese and Coelli’s (1995) inefficiency effect model, is used to obtain farm-specific estimates of technical and irrigation water efficiency. The last step of the analysis consists on the identification of the factors influencing irrigation water efficiency differentials across citrus growing farms on the basis on a second-stage regression...
Tipo: Conference Paper or Presentation
Palavras-chave: Water Efficiency; Stochastic frontier production function; Small; Medium and large citrus farms; Tunisia; Crop Production/Industries.
Ano: 2010
URL: http://purl.umn.edu/97328

Assessment of sustainability in organic and conventional farms in Tunisia: The case of olive-growing farms in the region of Sfax
Provedor de dados: 31
Autores: 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

Macroeconomics and Agriculture in Tunisia
Provedor de dados: 31
Autores: Ben Kaabia,   Monia; Gil,   Jose Maria; Chebbi,   Houssem Eddine.
This paper aims to analyse the impact of changes in the monetary policy and the exchange rate on agricultural supply, prices and exports. The methodology used is based on the multivariate cointegration approach. Ten variables are considered: interest and exchange rates, money supply, inflation, agricultural output and input prices, agricultural supply and exports, income and the rate of commercial openness. Sample period covers annual data from 1967 to 2002. Due to the short-sample period, two subsystems are considered. First, long-run relationships are identified in each subsystem. Second, both subsystems are merged in order to calculate the short-run dynamics. Results indicate that changes in macroeconomic variables have an effect on the agricultural...
Tipo: Conference Paper or Presentation
Palavras-chave: Macroeconomic policy; Agro-food sector; Tunisia; Impulse-response functions; Political Economy; C32; N57; O31.
Ano: 2005
URL: http://purl.umn.edu/24597

Fitness cost in field Anopheles labranchiae populations associated with resistance to the insecticide deltamethrin
Provedor de dados: 92
Autores: Tabbabi,Ahmed; Daaboub,Jabeur.
Abstract We evaluated in the present study the effect of deltamethrin resistance on the fitness cost of the filed populations of Anopheles labranchiae. A susceptible population was used as reference to do different comparisons. We selected the most resistant larvae population collected from northern Tunisia. Eggs were used for study of life history traits including developmental time, larvae mortality, fertility, hatchability and adult sex-ratio. Our results showed that deltamethrin resistance affected negatively (p &lt; 0.05) the developmental time with the median range of 70 h, mortality with the rate of 7 folds in resistant population and hatchability which are lower than in susceptible population. Whereas, no significant differences were detected in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deltamethrin; Insecticide resistance; Fitness cost; Anopheles labranchiae; Malaria vector; Tunisia.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262018000200107