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Mohamed Neji Mohamed Moncef Serbaji Olivier Hardy Mohamed Chaieb 《Arid Land Research and Management》2018,32(3):291-315
Knowledge about vegetation patterns along disturbance gradients is essential for conservation and management of coastal habitats in arid regions. This study focuses on the floristic diversity and the factors controlling the vegetation structure in the Gulf of Gabès (Tunisia). For this purpose, the floristic diversity of 120 relevés belonging to three coastal sites with different disturbance levels (40 relevés per site) was analyzed in relation with 10 environmental and anthropogenic factors. Therophytes constitute 54% of the 237 plants species belonging to 44 families identified in the present study. The species richness and floristic diversity indices exhibited a similar trend and peaked in the slightly disturbed site (H′?=?3.38; S?=?176). The similarity between sites was relatively low and reached its maximum between the little and the highly disturbed sites. Two-way indicator species analysis and detrended correspondence analysis applied on the floristic data resulted in groups mainly determined by disturbance level by explicitly segregating the three sites. Canonical correspondence analysis (CCA) indicated that the spatial pattern of species composition was mainly influenced by anthropogenic variables. Partial CCA revealed that the effect of anthropogenic variables on floristic composition was thrice higher than the effect of environmental variables (57.5% vs. 18.4%, respectively). Overall, this study provides a broad understanding of the floristic diversity and vascular plant richness in the Gulf of Gabès. The obtained results reflected a disturbance–diversity pattern and thus revealed the obvious importance of maintaining the intermediate disturbance for biodiversity conservation and monitoring. 相似文献
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Riadh Badraoui Nouha Bouayed Abdelmoula Moncef Fki 《Pesticide biochemistry and physiology》2007,88(2):149-155
Tetradifon is a potent organochlorine acaricide with an estrogen-like structure. The wide spread use of this chemical is likely to pollute the environment. Only few studies have been reported for the evaluation of its short- and long-term toxic effects including genotoxicity and carcinogenicity and there have been conflicting results in in vitro and in vivo test systems. In this work, we have evaluated Tetradifon for its ability to induce genotoxic damages in female Wistar rats. A single cumulative dose of 2430 mg/kg BW was administrated orally for 12 female rats of 190 g BW during 12 weeks. Twelve additional rats, no treated, have served as control. Animals were sacrificed after 6 and 12 weeks of treatment. Genetic toxicity studies were conducted in rats bone marrow, by chromosomal aberrations (CAs) and sister-chromatid exchanges (SCEs) assays. The oxidative stress status of treated animals has been also evaluated by assessment of lipid peroxidation by measuring thiobarbituric acid reactive substances (TBARS). Some serum parameters: vitamins (A and E), triglyceride (TG) and total antioxidants status (TAS) were determined. Our results showed a significant increase in tissue TBARS concentrations in the two treated groups suggesting that Tetradifon induce an oxidative stress. Elsewhere, rats treated with Tetradifon exhibited a statistical decrease in serum level of vitamin E and a significant depletion of serum total antioxidant status. Whereas, in comparison to control rats, treated animal cells did not show a significant increase in either the frequency of SCEs or CAs. These results indicate that Tetradifon did not present direct genotoxic effect in female Wistar rats. But we suggest that its inducting of an oxidative stress may lead to indirect mutagenecity that should be evaluated by other series of in vivo genotoxicity assays as micronucleus test or comet assay. 相似文献
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Hedia Nasri Henry van den Brand Taha Najjar Moncef Bouzouaia 《Journal of animal physiology and animal nutrition》2020,104(1):257-268
Prolonged hatching egg storage (>7 days) influences internal egg quality and embryo survival during both storage and subsequent incubation. Moreover, effects of storage of hatching eggs interact with the breeder age. The aim of this review was to investigate how this interaction between storage duration and breeder age affects egg, embryo, hatchling and chicken characteristics. Prolonged storage resulted in a reduction in egg quality in both young and old breeders. This reduction was more pronounced in young flocks than in older flocks. For example, albumen pH increased more after 8 days of storage in younger flocks than in older flocks. Additionally, the embryonic morphological stage appears to increase as well with storage duration, but this increase is again more pronounced in younger flocks than in older flocks. Short storage (<7 days) seems to increase hatchability of eggs from young breeders, probably as a result of albumen liquefaction with consequently better oxygen availability for the embryo. However, long storage (>7 days) resulted in a decline in hatchability, which was stronger in older breeders than in younger breeders. Prolonged storage duration resulted in lower chicken quality in both young and old breeders, but interaction between storage duration and breeder age on multiple chicken quality parameters is not clear. Based on this review, it can be concluded that (a) Short storage can improve hatchability of eggs from young breeders, but not from older breeders. (b) Negative impact of long storage appears to be lower with young breeders than with old breeders. (c) Adapted storage conditions related to the age of breeders might be an option to reduce negative effects of prolonged storage on hatching egg quality and chicken quality. 相似文献
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Issam Nouairi Moncef Mrabet Mokded Rabhi Haythem Mhadhbi 《Archives of Agronomy and Soil Science》2013,59(12):1707-1718
In this work, we have compared the physiological responses of alfalfa plants inoculated with either Sinorhizobium meliloti strain S412 (Cu-tolerant) or S112 (Cu-sensitive) in the presence or absence of 0.5 mM of CuSO4. The addition of copper (Cu) introduced a decrease of nodule number and their dry weight (DW) in both symbioses. The interaction established with the Cu-sensitive strain is more affected by Cu than that with the tolerant one. In fact, plants inoculated with the sensitive strain revealed a decrease of shoot and root DW, larger than that found in plants inoculated with the tolerant strain. However, under copper supply, Medicago sativa with the Cu-tolerant strain did not show any significant changes in both shoot and root biomass production. Under Cu excess, high levels of Cu were detected in different parts of the plant in the two symbioses and a high translocation of Cu to aerial parts was shown with the strain S412. Plants with S412 were able to accumulate large quantities of calcium (Ca) in their roots and nodules. While Ca content decreased drastically in shoot at 0.5 mM of Cu treatment. Moreover, nodulation with S412 allowed plants to maintain high levels of magnesium (Mg) in all tissues and high iron (Fe) levels in nodules. Results suggest that this symbiotic pair could be used in phytostabilization of Cu-contaminated soils. 相似文献
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SSR-based genetic diversity assessment among Tunisian winter barley and relationship with morphological traits 总被引：10，自引：1，他引：10
For studying genetic diversity caused byselection for adaptation and end-use, 17microsatellites (SSR), representative ofthe barley genome, were used in 26 barley(Hordeum vulgare L.) accessions andcultivars in Tunisia. Theaccessions/cultivars originate fromdifferent geographic regions and are ofdifferent end-use. For the 15 polymorphicSSR, the mean number of alleles per locuswas 3.6 and the average polymorphisminformation content was 0.45. Clusteranalysis based on SSR data and onmorphological data clearly differentiatethe genotypes according to their type(local landraces vs. varieties), row-numberand end-use. The correlation between bothdiversity measures was highly significant(r = 0.25, p<10-5) and thecorrespondence between the clustering basedon SSR and morphological data wasrelatively good. Our results show the largegenetic diversity of the Tunisian barleycultivars and the association of thisdiversity with adaptation traits. 相似文献
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Mohamed Ghrab Rim Zitouna Mohamed Moncef Masmoudi Netij Ben Mechlia 《International Journal of Fruit Science》2016,16(3):323-334
Productivity of peach cultivars with different ripening seasons was studied under the growers’ conventional conditions of Tunisia. Experiments were performed in northern Tunisia (36° 41? N, 10° 15? E). Performances of Flordastar, Royal Glory, and Carnival as respectively early, mid-season, and late ripening cultivars were evaluated under the grower’s conventional irrigation programs. Fruit growth, yield, water supply, and water productivity were determined through four years. For the three cultivars, Flordastar, Royal Glory, and Carnival, fruit maturity was achieved at 650, 1100, and 2200 GDD, respectively. Average yields were 17.4, 29.8, and 41.1 t ha–1 and mean values of water productivity were 1.9, 3.1, and 3.6 kg fresh yield m–3 for early, mid-season, and late cultivars, respectively. Results of agronomic performances evaluation at the farm scale provided a reference on the behavior of early, mid-season, and late cultivars of peach in irrigated orchards in semi-arid conditions. 相似文献
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Nesseim Thierry Daniel Tamsir Benteboula Moncef Dieng Abdoulaye Mergeai Guy Marechal Françoise Hornick Jean-Luc 《Tropical animal health and production》2019,51(6):1383-1391
Tropical Animal Health and Production - This study was conducted to determine intake and growth performance of broiler chicks fed with Jatropha curcas kernel meal physico-chemically and... 相似文献