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Bardadi, Abdelkader, Zahira Souidi, Marianne Cohen, and Mohamed Amara. "Land Use/Land Cover Changes in the Tlemcen Region (Algeria) and Classification of Fragile Areas." Sustainability 13, no. 14 (2021): 7761. http://dx.doi.org/10.3390/su13147761.
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The Tlemcen region is characterized by very diverse and steep areas exposed to gravity hazards, especially in high and medium mountain areas. Tlemcen National Park was chosen for this study, the main objective of which is to map fragile areas in close relation to reduced vegetation cover due to land-use changes and forest fires. Multi-source data were used to monitor land use/land cover (LULC)patterns in the study area between 1987 and 2017. The methodology is based on an object-oriented classification of the Landsat images, using the K nearest neighbor method for mapping the major LULC classes at the national park level. The results show that LULC is constantly changing in the study area. In 1987, the landscape was made up of (16.5%) oak forests (holm oak, cork oak, zean oak) and Aleppo pine, which then deteriorated following repeated fires in the nineties to barely represent 7.22% of the surface in 1995, followed by a fast forest reclamation, with the forest area doubling in 10 years (13.46% of the area in 2005), and a near stabilization of the forest cover in 2017 with 14.68% of the area. These mutations are mainly due to fluctuations in anthropogenic action. Despite past declines and disturbances, the current forested area in the Tlemcen area represents significant forest capital classified as a national park to be protected and developed.
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Letreuch-Belarouci, Assia, Boumediene Medjahdi, Noureddine Letreuch-Belarouci, and Kheloufi Benabdeli. "Diversité floristique des suberaies du Parc National de Tlemcen (Algerie)." Acta Botanica Malacitana 34 (December 1, 2009): 77–89. http://dx.doi.org/10.24310/abm.v34i0.6913.
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RESUME. Diversité floristique des suberaies du Parc National de Tlemcen (Algérie). L’analyse de la diversité floristique des forêts de Hafir Zariffet a révélé l’existence de 211 taxons appartenant à 65 familles et 164 genres. Le nombre de taxons endémiques et/ou rares inventoriés comporte: 1 endémique algérien,7 algéro-marocains, 11 ibéro-algéro-marocains, 7 sont endémiques d’Afrique du Nord et 11 sont des endémiques d’Afrique du Nord et de la Péninsule ibérique. Le nombre des taxons rares s’élève à 26 dont 9 sont en même temps rares est menacés. Des efforts urgents de protection doivent êtres consentis pour préserver le chêne liège ainsi que les espèces endémiques qui lui sont inféodées.Mots clés. Subéraies, inventaire, diversité, Parc National de Tlemcen, Algérie.SUMMARY. Flora diversity of cork oak forest in the National Park of Tlemcen (Algeria). The analysis of the floristic diversity of forest massif “Hafir-Zariffet” in the Tlemcen National Park has revealed the existence of 211 taxa which belong to 65 families and 164 genera. The number of taxa endemic and/or rare includes: 1 endemic algerian, 7 algero-moroccan, 11 ibero-algero-moroccan, 7 are endemic in North Africa and 11 are endemic in Iberian Peninsula and North Africa. The number of rare taxa is 26, 9 are at the same time threatened. Urgent efforts are required to preserve the cork oak as well as endemic species confined to it.Key words. Cork oak forest, inventory, diversity, National Park of Tlemcen, Algeria.
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Medjahdi, Boumediene, Assia Ltreuch-Belarouci, and Rémy Prelli. "Actualisation du catalogue des pteridophytes du Nord Ouest Algerien (region de Tlemcen). An update of the cheklist of pteridophytes from Nordwest Algeria (Tlemcen region)." Acta Botanica Malacitana 38 (December 1, 2013): 33–39. http://dx.doi.org/10.24310/abm.v38i0.2638.
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Français. Un inventaire des ptéridophytes a été entrepris dans les forêts de la région de Tlemcen. L’inventaire de ces populations constitue une étape importante pour le développement des stratégies de conservation des ressources génétiques et de la diversité de ces populations sur l’ensemble de leur aire de distribution naturelle. Nous avons ainsi effectué le recensement et l’identification des fougères existantes dans la région de Tlemcen. Au total, plusieurs stations dont les caractéristiques écologiques diffèrent d’un site à un autre ont été prospectées, cela a permis l’identification de 26 taxons (dont 5 exceptionnellement rare). La création de réserves naturelles forestières renforcée par une protection réglementaire des espèces les plus menacées est nécessaire pour le maintien de ces communautés si particulières. English. An inventory of Pteridophyta was begun in the forests of the Tlemcen region. The inventory of these populations constitutes an important stage for the developement of the strategies of preservation of the genetic resources and the diversity of these populations on their whole area of natural distribution. We so made the inventory and the identification of the existing ferns in the region of Tlemcen. On the whole, several stations the ecological characteristics differ from a site in the other one were canvassed; they allowed the identification of 26 taxes (among which 5 exceptionally rare). The creation of forest nature reserves strengthened by a statutory protection of the most threatened species is necessary for the preservation of these particular communities.
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MAAZOUZ, Sarah, Yassmina BENDAkHA, Mohamed AIT HAMMOU, and Abdrrezzak BENFRIHA. "First Taxonomic study of the Lichens in the Tlemcen National Park (Case of Hafir Forest)." Genetics & Biodiversity Journal 6, no. 2 (2022): 201–11. http://dx.doi.org/10.46325/gabj.v6i2.279.
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The objective of this work is the inventory of lichens in the Hafir forest, it is part of a more general project aimed at studying the lichen flora of the Tlemcen region. The Hafir forest is one of the last Algerian mountainous cork oak forests belonging to the Bético Rifain complex. Our study area enjoys a Mediterranean climate, subhumid with cool winters. Based mainly on random sampling, giving particular importance to the different types of substrate, we were able to sample 73 species of lichens belonging to 16 families and 38 genera. Among these, the Parmeliaceae family is the most dominant with 19 species followed by the Lecanoraceae family which is represented by 14 species and the Physciaceae by 13 species. The physiognomic spectrum shows the presence of 06 lichen categories: foliaceous lichens, crustaceans, fruticose, gelatinous, scaly and leprous. While the classification by type of substrate shows the dominance of corticolous lichens with 48 species followed by saxicolous with 13 species, terricolous with 06 in number and lignicoles and muscicoles with 03 species each. We were able to identify 18 species protected by Algerian law among inventoried lichens. The Hafir forest is home to a very interesting lichen diversity that deserves to be protected, which requires immediate intervention to reduce the anthropogenic pressure exerted and which can pollute this natural environment.
 Keywords:Lichen - Biodiversity-Sampling- Inventory- Tlemcen
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Derbal, Nour El Houda, Linda Abi-Ayad, and Bahae-Ddine Ghezlaoui Bendi-Djelloul. "Biodiversity of the oak groves of the Tlemcen Mountains, Algeria. Phytoecological aspects." European Journal of Biological Research 11, no. 4 (2021): 434–45. https://doi.org/10.5281/zenodo.5527194.
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The objective of this study is to know the influence of environmental conditions on the distribution of oak species in the Tlemcen Mountains. We made a bioclimatic and floristic study on four stations located on the mountain ranges of the Tlemcen Mountains. This study was carried out, taking into account the ecological aspect oriented towards the presence of oak species within the four study stations. The main ecological gradients governing the ecological trends of oak forests in this area have been characterized. The ecological dynamics of oak taxa within the local floristic procession for each station was analyzed by Mintab 16 software according to factorial discrimination of correspondences (A.FC), which led us to highlight the most influential ecological gradients.
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Chahbar, Mohamed, Mounir Kherroubi, Fatiha Boutchiche, Souhila Boutrigue, and Semir Bechir Suheil Gaouar. "Morphometric characterization of the pine processionary, Thaumetopoea pityocampa in the Tlemcen area, Algeria." GABJ 5, no. 3 (2021): 164–70. http://dx.doi.org/10.46325/gabj.v5i3.156.
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 The pine processionary (Thaumetopoea pityocampa) is the most important defoliator of coniferous forest of the Mediterranean basin. The pine processionary also caused real public health problems. The urticat property is the origin of its health problems. It is still the subject of several studies to this day in order to develop friendly control strategies that respect the environment. The study carried out about the characterization of the pine processionary populations in two stations of pine forests located at the area of the Tlemcen. The caterpillars were collected in January 2016 in the Tlemcen region. Measurements were performed on L5 larvae and male and female nymphs. The statistical analyses were carried out using the SAS 9 software. The results obtained show that the females have an average length of 11.51 ± 1.07 mm and an average width of 7.87 ± 0.33 mm. Males have an average length and width of 11.51 ± 1.07 mm and 6.48 ± 0.29 mm, respectively. The length and width of the head capsule is 43.28 ± 6.63 mm and 4.50 ± 1.35 mm respectively. The GLM procedure of the SAS.9 software allowed us to observe that the Sebdou station is more attacked by this insect compared to the Ghazaouet station despite that there is a similarity between the biometric characters of the pine plants. Our statistical analyses have also shown that trees with the longest needles are the most resistant against insect attack.
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Bouzid, A., K. Bouzid, and K. Benabdeli. "Contribution the Failure Mode Analysis and Criticality Evaluation Method to the Rehabilitation of Cork Oak (Quercus suber) Forests in Forest Massif of Tlemcen (Algeria)." Jurnal Manajemen Hutan Tropika (Journal of Tropical Forest Management) 28, no. 2 (2022): 191–200. http://dx.doi.org/10.7226/jtfm.28.2.191.
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The controling of forest sustainability and preforest ecosystems in achieving stability of forest ecosystem require the identification of biophysical indicators, anthropological, and technological. The significant degradation of Quercus suber formations in forest massif of Tlemcen (Algeria) are imposed by both climatic factors, the fires, the overgrazing land, anthropogenic aggression as well as by ineffective management. The making of a reference matrix would make possibility the identification of probable hazards and risks. This study aimed to identify the understanding how the mode of operation of a system to identify failures and treat, and the create the intention of eliminating or minimizing the associated risks. This matrix will consist of relevant indicators which easy guide to estimate and following the understanding of the forest degradation process in Algeria. The FMECA method allowed identification of 20 main defective targets which be grouped into 3 categories namely: technical, ecological, organizational, and facilitate of remediation. Each error can be scored and action plans can be prioritized, allowing different with all forest sector players to better understand the degradation of this natural space in order to implement efficient and appropriate remediation plans.
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Bouazza, Naima, Kaouider Cherifi, Brahim Babali, and Mohammed Bouazza. "Bibliographical note on the syntaxonomy of the vegetation of Tlemcen, Hafir, Moutas and its reserve (North-western Algeria)." Bangladesh Journal of Plant Taxonomy 27, no. 2 (2020): 345–58. http://dx.doi.org/10.3329/bjpt.v27i2.50673.
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This study provides bibliographical note on the syntaxonomy of the vegetation of Tlemcen, Hafir, Moutas of North-western Algeria, including the associations and alliances of the different higher units found in the Hafir forest and the Moutas Reserve. In this work, we observed modifications of forest and pre-forest structures according to bioclimatic variations. However, in this region, the xericity of the climate is not the only factor destroying the plant cover, anthropization is also a degradation factor. While being aware of the negative consequences, man, through their abusive cultivation, illegal logging, overgrazing, urbanization, the depletion of natural resources;, inhibits the evolution of vegetation, participates in the replacement of a rich plant cover by another and more xerophytic plant cover with thorny and/or toxic feature. The landscape is dominated, for the most part, by open and degraded formations based on therophytes and chamaephytes, linked to Rosmarinetea and Cisto-Lavanduletea. The tree structures in Hafir and the Moutas reserve, still occupy only minimal areas subject to the destructive actions of man and his flock. These formations are still linked to the Quercetea ilicis. These ecosystems are marked by a regressive evolution (forest, pre-forest, scrub, scrubland and therophytization).
 Bangladesh J. Plant Taxon. 27(2): 345-358, 2020 (December)
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Fadila, Larabi, Berrichi Mohamed, and Paletto Alessandro. "Social Demand for Ecosystem Services Provided by Peri-Urban Forests: the Case Study of the Tlemcen Forest (Algeria)." Journal of Environmental Accounting and Management 9, no. 1 (2021): 19–29. http://dx.doi.org/10.5890/jeam.2021.03.003.
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Kada, BENCHERIF, and Mohamed BELLIFA. "The expected impact of climate change on forest species composition in the national park of Tlemcen-Algeria." Agriculture and Forestry Journal 1, no. 2 (2017): 79–88. https://doi.org/10.5281/zenodo.1134275.
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At the planetary level, climatic forecasts announce for the next 50 years, an increase of the dry period and a decrease in rainfall. The Mediterranean forest landscape, already altercated through human activity, will undergo once again, the effects of this climatic warming tendency. Facing this double pressure, forest structures of oak coppices and shrub-lands in the national park of Tlemcen (North-west of Algeria) seem enough weak so to ensure sustainable landscape protection. The risks resulting from anthropogenic action, as well as the favorable dynamics for zen oak and oxycedar juniper compared respectively with cork and holm oaks, would be the beginning of a specific substitution and of an ecological and structural modification. Without neglecting the protecting and defending measures, forestry based on the species ecology and their dynamism could be a solution if it is led in uneven-aged and mixed stands, structure that proved real advantages as for the protection of biodiversity and the resilience against fire and pathology risks.
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Kermouni Serradj, Ahmed Marwane, Safa Hadhoum Tebbal, Djamila Touenti, Ghizlane Benchaib, and Amina Bouri. "Genetic diversity evaluation of Tetraclinis articulata L. in Algeria." GABJ 6, no. 1 (2022): 57–71. http://dx.doi.org/10.46325/gabj.v6i1.198.
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Tetraclinis articulata is an endemic, medicinal and aromatic species of the cupressaceae family with an economic importance. The objective of our study is based on the morpho-metric characterization of a 210 individual sample from seven populations distributed in five regions in western Algeria: Tlemcen (Ain fezza (Yfri forest), Ain Ghraba (Ahfire forest), Beni Snous (Zarifate forest)), Ain Temouchent ( Madagh 2 forest) , Oran (the Virgin forest) , Relizane ( Zemmora forest) and finely Sidi Bel Abbes (Tenira forest) using eight morphological traits :Circumference of the tree (CRF),The tree height (TH),The tree crown (TCR), The length of primary branch (LgB1),The length of secondary branch (Lg B2),The length of the needles(LgNd) which were statistically studied using the R software. Phenotypic diversity was determined by the Shannon-Weaver diversity index (H') at different levels. The estimated H' showed a large phenotypic variability for different traits with a mean of 0.90. The results of the multiple correspondence analysis (MCA) and hierarchical clustering (HCA) showed a clear distinction between the populations. The extraction of essential oils was done for all populations; the yield of essential oils from the trees of the Beni Snouss population was higher than the other populations which is very important for future economic perspectives and we all so found that there is a negative correlation between the yield of essential oils and The length of the needles (LgNd) which can be used to identify the subjects with the best performance.
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Hasnaoui, Okkacha, Farah Bessaid, Mohamed Bourouaha, Brahim Babali, Sid Ahmed Aouadj, and Hadj Khatir. "Post-fire dynamics of the forest formations in the mounts of Tlemcen (Western of Algeria): Case of the Forest of Zarifet." Biodiversity Journal 14, no. 1 (2023): 185–94. http://dx.doi.org/10.31396/biodiv.jour.2023.14.1.185.194.
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Addoun, M., A. Ayache, B. Hellal, and N. Ayad. "Diachronic analysis of soil occupancy using remote detection tools in Tlemcen Province southern (western Algeria)." Journal of Fundamental and Applied Sciences 13, no. 1 (2021): 75–88. http://dx.doi.org/10.4314/jfas.v13i1.5.
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The diachronic land use analysis, performed by processing the sensor data, is based on the 10-and 30-yearchange maps. The dynamics of the vegetation is followed by the application of the NDVI. The gradual and regressive changes in the components of land use reached the rates of 44.78% and -29.21% respectively. The most reduced surfaces are the forest massifs, the steppe area and to a lesser extent the waters of the saline surfaces (dayet). Cereal crops, urban and mineral areas, on the other hand, have increased in area to the detriment of the natural plant cover. The stability of the studied area recorded only a rate of 26.01%. This rate represented only ¼ of the area of the south of Tlemcen region.
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Benkhelifa, Asma, and Bahae-Eddine Bendi-Djelloul-Ghezlaoui. "Weakening Risks of the Quercus Faginea Subsp. Tlemcenensis (DC.) M. in Tlemcen Mountains (Algeria): Case of the Nature Reserve of Moutas." Annals of "Valahia" University of Târgovişte. Agriculture 17, no. 1 (2025): 6–15. https://doi.org/10.2478/agr-2025-0003.
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Abstract The zeen oak (Quercus faginea Lamk.) is a deciduous oak whose presence can range from meso-Mediterranean to the supra-Mediterranean level. It is considered an endemic taxon of the western Mediterranean forest. It would be represented in the Tlemcen Mountains and in particular in the Moutas reserve by a subspecies: Quercus faginea subsp. tlemcenensis (DC.) M. Among the ecological factors that contributes to its weakening and threaten it over the last twenty years. The water deficits recorded in the reserve and mainly due to the shift of ombrotypes from hyper-subhumid to upper semi-arid. However, the taxon shows a better ability to resist these deficits and precipitation breaks by initiating its resilience at the level of depressions benefiting from water compensation.
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Bouazzaoui, Ayyoub, Rachid Tarik Bouhraoua, and Mohammed Ghefar. "Factors affecting post-fire, vitality and recovery of cork oak trees in Yifri forest (NorthWest of Algeria)." Lebanese Science Journal 22, no. 2 (2022): 148–64. http://dx.doi.org/10.22453/lsj-022.2.148-164.
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The cork oak (Quercus suber L.) is a fire-adapted species due to the protection of dormant buds located under its cork bark. Post-fire resprouting in trees from these buds is an efficient means of plant adaptation. In this study, we examined the different types of the response of 644 trees, one year after a wildfire occurred in summer 2012 in the Tlemcen area. Furthermore, we determined the variables influencing the vitality likelihood of trees using multiple logistic regression. The dominant response is crown resprouting (67.7%), followed by tree death (23.9%) and basal resprouting (8.4%). The probability of tree vitality decreased with increasing fire intensity which associated with the importance of trunk injuries, decreasing bark thickness and tree height. This model is an interesting tool for diagnosing tree mortality or survival to assess the ecological and economic restoration actions for the forest.
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Ghalem, Amina, Inês Barbosa, Rachid Tarik Bouhraoua, Augusta Costa, and Raffaele Dello Ioio. "Comparing cork quality from Hafir-Zarieffet mountain forest (Tlemcen, Algeria) vs. Tagus basin Montado (Benavente, Portugal)." Cogent Biology 2, no. 1 (2016): 1236431. http://dx.doi.org/10.1080/23312025.2016.1236431.
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Bencherif, K. "Ecological response to the climate change of the main forest species in the region of Tlemcen-Algeria." International Journal of Forestry, Ecology and Environment 1, no. 1 (2020): 1–9. http://dx.doi.org/10.18801/ijfee.010120.01.
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Mohamed, Berrichi, Chabani Youcef, and Bouazzaoui Ayyoub. "Study of the effect of silvicultural treatments and exposure on the morphology of the leaf: case of the green oak of the region of Tlemcen (north-west of Algeria)." Agriculture and Forestry Journal 1, no. 1 (2017): 49–55. https://doi.org/10.5281/zenodo.810316.
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In the forest area of Tlemcen, green oak on its large expanse is abundantly represented in two forms: simple coppice and trees on stump. This study, try to verify the effect of the silvicultural treatments and exposure on leaf morphology. To this end, we tested this hypothesis on 240 mature leaves of these two populations collected from the four cardinal directions. The results show that the length of midrib is 4.85 cm in the case of high trees, 4.80 cm in the coppices. The surface of leaf-blade is 8.87 cm2 in the high trees and 8.35 cm2 in coppices. Angle of insertion of the secondary rib with the main rib is 122.86° in the case of high trees, 121.22° in the coppices. Variance analysis indicates that there is no effect of the silvicultural treatments and exposure on leaves morphological parameters.
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Bentekhici, Nadjla, Sid-Ahmed Bellal, and Ahmed Zegrar. "Contribution of remote sensing and GIS to mapping the fire risk of Mediterranean forest case of the forest massif of Tlemcen (North-West Algeria)." Natural Hazards 104, no. 1 (2020): 811–31. http://dx.doi.org/10.1007/s11069-020-04191-6.
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Dahmani, Rachid, Amine Habib Borsali, Abdessamad Merzouk, Mohamed Zouidi, and Anne-Marie Farnet Da Silva. "Dynamics of chemical and microbial properties of Algerian forest soils: Influence of natural and anthropogenic factors (Northwest of Tlemcen)." Forestry Studies 78, no. 1 (2023): 41–56. http://dx.doi.org/10.2478/fsmu-2023-0004.
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Abstract In Djebel Fellaoucene, mattorals and their regressive and progressive dynamics are affected by several factors, namely climate, geography, human activities, overgrazing and fires. This research aims to investigate whether these factors have an impact on the structural dynamics of the area’s forest soils and show a correlation between the soils’ chemical and microbial properties and these factors. In this regard, we have analysed chemical properties: organic matter, pH, conductivity, calcium carbonate (CaCO3), moisture and carbon as well as microbial properties: basal respiration, microbial biomass and metabolic quotient (qCO2), all from 80 soil samples collected from degraded mattorals on different altitudes and exposures. Principal Component Analysis (PCA) which has been made revealed that soil dynamics and correlations between chemical and microbial properties depend on the aforementioned factors; an increase in moisture, organic matter, carbon and conductivity as well as a decrease in the mass and bacterial respiration in the North-exposed sites under anthropogenic pressure and overgrazing by sheep and goats. Whereas opposite results were found in the South-exposed sites degraded by fires and undergrazing by cattle. Anthropogenic pressure and overgrazing in sites which have recently been burned lead to a decrease in microbial properties despite an increase in organic matter and moisture content. Qualifying and quantifying the impact of these degradation factors on forest soils allows us to establish effective restoration, conservation strategies and defend rangelands in arid areas.
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Kholkhal, Djamel, and Benamar Benmahioul. "Effects of substrate on the germination and seedling growth of Quercus suber L." Biodiversity Research and Conservation 64, no. 1 (2021): 7–14. http://dx.doi.org/10.2478/biorc-2021-0008.
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Abstract The seedling quality is one of the most important factors for the success of reforestation programs. In this sense, this work aimed to evaluate the effects of substrate on the germination of cork oak acorns from El Aouana forest, located in the Jijel region of north-eastern Algeria, and on the performance of seedlings, particularly their growth. The experiment was performed in the nursery of the Tlemcen Forest Conservation. For this purpose, five substrates were used: S1 (sand), S2 (topsoil), S3 (potting soil), S4 (1/2 sand + 1/2 topsoil) and S5 (1/3 sand + 1/3 topsoil + 1/3 potting soil). Germination and survival rates, and seedling morphological traits: average height of seedlings, average root collar diameter, stem height/root collar diameter ratio (H/D), average number of leaves per plant, leaf length, leaf width and leaf area, were evaluated. Results obtained after 16 months of monitoring in the nursery showed high germination rates of 91.4%, with an average survival rate of 89.5%, and significant differences were recorded between the substrates tested. In terms of growth, the best results were obtained with the potting soil substrate (S3) for all parameters. The lowest yields were recorded in seedlings grown on sand alone (S1).
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El Bouhissi, Mayssara, Habib Allah Benhamou, Abdelkader Bekkouche, Yassine Boulenouar, Zouaoui Khacheb, and Abdelwahab Chedad. "New distribution and breeding location of the Stock Dove Columba oenas in Algeria." Ornis Hungarica 32, no. 1 (2024): 209–21. http://dx.doi.org/10.2478/orhu-2024-0015.
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Abstract Algeria hosts seven species of the Columbidae family, including pigeons and doves, the majority of which have been the subject of numerous studies, but none have been conducted on the Stock Dove (Columba oenas). Data on this species are still scarce, and its distribution is limited only to Kabylie in northern Algeria. Species occurrence data were collected from September 2022 to August 2023 using the point count method. However, the species was recently recorded in several new localities (20 stations) in West Algeria, at Sidi Bel Abbès and Tlemcen. All our observations were made in a semi-arid bioclimatic area at an altitude ranging between 750 and 1,216 m. Nesting sites were located on woodland and forest edges, not far from water sources, and feeding sites were located in open, natural, or agricultural environments where cereal seeds, grasses, flower buds, and young green shoots were consumed. It could also cohabit with other species of pigeons and doves.
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Selka, Imene, Abderahemane Medjdoub Mokhtari, Kheira Anissa Tabet Aoul, Djamal Bengusmia, Kacemi Malika, and Khadidja El-Bahdja Djebbar. "Assessing the Impact of Land Use and Land Cover Changes on Surface Temperature Dynamics Using Google Earth Engine: A Case Study of Tlemcen Municipality, Northwestern Algeria (1989–2019)." ISPRS International Journal of Geo-Information 13, no. 7 (2024): 237. http://dx.doi.org/10.3390/ijgi13070237.
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Changes in land use and land cover (LULC) have a significant impact on urban planning and environmental dynamics, especially in regions experiencing rapid urbanization. In this context, by leveraging the Google Earth Engine (GEE), this study evaluates the effects of land use and land cover modifications on surface temperature in a semi-arid zone of northwestern Algeria between 1989 and 2019. Through the analysis of Landsat images on GEE, indices such as normalized difference vegetation index (NDVI), normalized difference built-up index (NDBI), and normalized difference latent heat index (NDLI) were extracted, and the random forest and split window algorithms were used for supervised classification and surface temperature estimation. The multi-index approach combining the Normalized Difference Tillage Index (NDTI), NDBI, and NDVI resulted in kappa coefficients ranging from 0.96 to 0.98. The spatial and temporal analysis of surface temperature revealed an increase of 4 to 6 degrees across the four classes (urban, barren land, vegetation, and forest). The Google Earth Engine approach facilitated detailed spatial and temporal analysis, aiding in understanding surface temperature evolution at various scales. This ability to conduct large-scale and long-term analysis is essential for understanding trends and impacts of land use changes at regional and global levels.
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Boufatah, Sidi Mohammed, Ikram Mkedder, and Semir Bechir Suheil Gaouar. "Contribution to the morphometric characterization and physico-chemical analysis of meat of porcupines (Hystrix cristata ) in Tlemcen region." GABJ 6, no. 1 (2022): 1–15. http://dx.doi.org/10.46325/gabj.v6i1.190.
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In Algeria, the work undertaken on the ecology of wild rodents mainly focuses on gerbils and merions, and Cténdactylideae. As for hystricide, to our knowledge studies are non-existent although porcupine (Hystrix cristata). Although being a protected species, the porcupine is considered an agricultural pest, with tasty meat, and therefore largely poached. This study took place over a two-year cycle from 2017 to 2019. Field investigations began in region of Tlemcen. A survey was carried out to collect information; we used 25 questions about farmer and hunter like age, jobs, profession ...) also a question about the use of porcupine in this area and how the farmer and hunter deal with this animal. Sampling was carried out on individuals of both sexes, male and female. A total of 22 individuals were sampled, including 12 males and 10 females. The description of the qualitative characteristics was made using a visual examination. Two qualitative variables were studied. The description of the quantitative characteristics was carried out using a tape measure in which each animal was subjected to 15 body measurements. For the physico-chemical analysis, 100 g of fresh meat from two healthy individuals was used. Descriptive analysis revealed that females are larger than males; the black color of the skin (59.09%) is the most dominant compared to the dark brown (36.36%) and light brown (4.54%) color. Principal component analysis (PCA) has shown that all quantitative variables are positively correlated with each other. The principal component analysis of individuals by region shows that the majority of individuals from the interior plains have high values (Maghnia and Remchi) and the majority of individuals from forest areas have the lowest values (Ghazawat, Mafrouche and Ain fezza) . Principal component analysis of individuals by sex shows that females contain high values compared to males. Principal component analysis of individuals by skin color shows no difference between individuals. The ascending hierarchical classification (CAH) confirmed the results of the CPA which allowed us to distinguish 4 classes. The results of physico-chemical analysis of the fresh meat of 2 individuals (male and female) of the Ghanmi breed, for 100g of fresh meat reveal that the protein content is 21.5-20 g, the lipid content is quite important in the female compared to the male (3g in the female and 1.35 g in the male). In contrast, the carbohydrate content and per 100 g of meat was zero
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Zine, Mohamed, Fouzi Harrou, Mohammed Terbeche, Mohammed Bellahcene, Abdelkader Dairi, and Ying Sun. "E-Learning Readiness Assessment Using Machine Learning Methods." Sustainability 15, no. 11 (2023): 8924. http://dx.doi.org/10.3390/su15118924.
Full textAbstract:
Assessing e-learning readiness is crucial for educational institutions to identify areas in their e-learning systems needing improvement and to develop strategies to enhance students’ readiness. This paper presents an effective approach for assessing e-learning readiness by combining the ADKAR model and machine learning-based feature importance identification methods. The motivation behind using machine learning approaches lies in their ability to capture nonlinearity in data and flexibility as data-driven models. This study surveyed faculty members and students in the Economics faculty at Tlemcen University, Algeria, to gather data based on the ADKAR model’s five dimensions: awareness, desire, knowledge, ability, and reinforcement. Correlation analysis revealed a significant relationship between all dimensions. Specifically, the pairwise correlation coefficients between readiness and awareness, desire, knowledge, ability, and reinforcement are 0.5233, 0.5983, 0.6374, 0.6645, and 0.3693, respectively. Two machine learning algorithms, random forest (RF) and decision tree (DT), were used to identify the most important ADKAR factors influencing e-learning readiness. In the results, ability and knowledge were consistently identified as the most significant factors, with scores of ability (0.565, 0.514) and knowledge (0.170, 0.251) using RF and DT algorithms, respectively. Additionally, SHapley Additive exPlanations (SHAP) values were used to explore further the impact of each variable on the final prediction, highlighting ability as the most influential factor. These findings suggest that universities should focus on enhancing students’ abilities and providing them with the necessary knowledge to increase their readiness for e-learning. This study provides valuable insights into the factors influencing university students’ e-learning readiness.
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Lazreg, F., L. Belabid, J. Sanchez, E. Gallego, J. A. Garrido-Cardenas, and A. Elhaitoum. "First Report of Fusarium redolens as a Causal Agent of Aleppo Pine Damping-Off in Algeria." Plant Disease 97, no. 7 (2013): 997. http://dx.doi.org/10.1094/pdis-12-12-1169-pdn.
Full textAbstract:
Aleppo pine (Pinus halepensis Mill.) is a common native coniferous tree in the natural forests of the Mediterranean region. In 2008 and 2009, a survey of Aleppo pine seedling diseases was performed in three forest nurseries from Relizane, Sidi Bel Abbes, and Tlemcen departments in northwestern Algeria. Aleppo pine seedlings showed symptoms of pre- and post-emergence damping-off, resulting in severe crop losses. The problem was widespread with a disease incidence of 64 to 77%. Fusarium redolens Wollenw. was isolated from Relizane and Sidi Bel Abbes forest nurseries. Disinfested root and root collar segments, approximately 5 mm in length, were cultured on potato dextrose agar (PDA) and incubated at 25°C. Morphological identification was done according to Fusarium keys (2). PDA colonies consisted of flat mycelium with sparse white aerial hyphae. Macroconidia with three to five septa, 24 to 43.8 μm long, widest upper third, hooked apical cell, and foot shaped basal cell were observed. Microconidia with zero to one septa, 6.8 to 10.4 μm long, oval to cylindrical, and produced on monophialides were also observed. Chlamydospores were produced abundantly in terminal and intercalary chains, in 3- to 4-week-old cultures. To confirm the identity of the fungus, the internal transcribed spacer (ITS) of F5RS3, F91SR, F55RS1, F8RS3, and F09SS1 isolates of F. redolens were amplified and sequenced using ITS 1 and ITS 4 primers (3). GenBank Accession Nos. are JX051323 to 26, and JX114783, respectively. Those sequences bore 99% (JF311916) and 100% (U34565) similarity with sequences of F. redolens in GenBank. A Fusarium pathogenicity assay was used to complete Koch's postulates. Inoculum was produced by adding a 5 mm diam. agar disc from a 7-day-old CMA petri dish culture to a previously sterilized 500 ml flask (237.5 g of sand, 12.5 g of cornmeal, and 80 ml of deionized H2O). Isolates were allowed to colonize the medium for 9 days, and flasks were shaken every day. The inoculum was mixed with sterile soil at a rate of 3:1 (v:v). Infested soil was then transferred to 500 ml pots, and 10 Aleppo pine seeds were planted. A completely randomized design was used with three replicates. After 1 month, all tested isolates caused typical damping-off symptoms on seedlings. The percentage of the inoculated plants that became infected was 53 to 91%. To our knowledge, this is the first report of F. redolens being pathogenic on Aleppo pine in northwestern Algeria and throughout the world. In Algeria, F. redolens has been reported on tomato (Solanum lycopersicum L.) (1), suggesting that it is adapted to the conditions of this area and could become a major threat to regional plant production. The annual economic impact of this disease was estimated at approximately US$50,000 per forest nursery. References: (1) N. Hamini-Kadar et al. New Dis. Rep. 22:3, 2010. (2) J. F. Leslie and B. A. Summerell. The Fusarium Laboratory Manual. Blackwell Publishing, Ames, Iowa, 2006. (3) T. J. White et al. Pages 315-322 in: PCR Protocols: A Guide to Methods and Applications. Academic Press, San Diego, 1990.
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Lazreg, F., L. Belabid, J. Sanchez, E. Gallego, J. A. Garrido-Cardenas, and A. Elhaitoum. "First Report of Fusarium chlamydosporum Causing Damping-Off Disease on Aleppo Pine in Algeria." Plant Disease 97, no. 11 (2013): 1506. http://dx.doi.org/10.1094/pdis-02-13-0208-pdn.
Full textAbstract:
The Aleppo pine (Pinus halepensis Mill.) is a conifer native to the Mediterranean region. In 2008 and 2009, a survey of Aleppo pine seedling diseases was performed in three forest nurseries from the Relizane, Sidi Bel Abbes, and Tlemcen departments in northwestern Algeria. One- to two-month-old Aleppo pine seedlings showed symptoms of damping-off in pre- and post-emergence (typical seedling collar rot). The problem was widespread with a disease incidence of 64 to 77% and an annual impact of US$50,000. Disinfested root and root collar segments (from four composite samples per location), approximately 5 mm in length, were cultured on PDA and incubated at 25°C and day/night light. Two (from 21) isolates were identified morphologically (2) as the anamorph Fusarium chlamydosporum Wollenw. & Reinking and isolated from collar rots of Relizane forest nursery seedlings. Colony development on PDA media was fast; 32 mm diameter colonies developed after 3 days. Colonies were white. Mycelia were floccose, fairly dense, off-white, and turned a lilac color in older portions of the colony. Macroconidia were thick-walled and moderately curved with unequal dorsiventral curvature (the lower wall is almost straight), short, curved and pointed apical cell, usually notched, but occasionally foot shaped basal cell, 3- to 5-septate, and 2 × 8 to 21 μm. Microconidia were abundant, 0-septate, and 2 × 6 to 9 μm. Chlamydospores were abundant, formed rapidly in single chains or clusters, and 8 to 15 μm diameter. To confirm the identity of this fungus, the internal transcribed spacer of F12RR and F4SR isolates of F. chlamydosporum were amplified and sequenced using ITS1 and ITS4 primers (4). Sequences were deposited in GenBank under accessions JX114795 and JX114789, respectively. Those sequences bore 99% similarity with reference sequence AY213655 (2) and 100% with HQ671187, also found 99 to 100% similarity with F. equiseti (Corda) Sacc. but with different conidia. Pathogenicity tests were performed to fulfill Koch's postulates. Inoculum was produced by adding a 5 mm diam. plug from a 7-day-old CMA petri dish culture to a previously sterilized 500 ml flask (237.5 g sand, 12.5 g cornmeal, 80 ml SDW), shaken over 9 days, and mixed with sterile soil at 1:3 (v:v). Infested soil was then transferred to 500 ml pots, and 10 seeds were planted. A completely randomized design was used with three replicates per isolate and three control pots. After 1 month, two tested isolates caused typical damping-off symptoms on seedlings. The percentage of the plants that became infected was 65 to 77%. To our knowledge (1,3), this is the first report of F. chlamydosporum on Aleppo pine in northwestern Algeria. It is also the first report of this fungal species affecting the Aleppo pine throughout the world, and on conifers in Africa and the Mediterranean region (1,3). References: (1) D. F. Farr and A. Y. Rossman. Fungal Databases, Syst. Mycol. Microbiol. Lab. ARS, USDA, Beltsville, MD. Retrieved from http://nt.ars-grin.gov/fungaldatabases/ , February 20, 2013. (2) J. F. Leslie and B. A. Summerell. The Fusarium Laboratory Manual. Blackwell Publishing, Ames, IA, 2006. (3) D. W. Minter. Cybertruffle's Robigalia, Observations of Fungi and their Associated Organisms. Retrieved from http://www.cybertruffle.org.uk/robigalia/eng/ , February 20, 2013. (4) T. J. White et al. Page 315 in: PCR Protocols: A Guide to Methods and Applications. Academic Press, San Diego, 1990.
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Lazreg, F., L. Belabid, J. Sanchez, E. Gallego, J. A. Garrido-Cardenas, and A. Elhaitoum. "First Report of Globisporangium ultimum Causing Pythium Damping-Off on Aleppo Pine in Algeria, Africa, and the Mediterranean Region." Plant Disease 97, no. 8 (2013): 1111. http://dx.doi.org/10.1094/pdis-07-12-0625-pdn.
Full textAbstract:
Globisporangium ultimum (Trow) Uzuhashi, Tojo & Kakish. (syn. Pythium ultimum Trow, syn. P. ultimum Trow var. ultimum) is a known oomycetal species from Pythium s.l. causing damping-off and/or root rot on a great variety of plants throughout the world, including some pine species (Pinus L.) and conifers (2,3). Aleppo pine (Pinus halepensis Mill.) is a common native forest tree in the Mediterranean region. Pre- and post-emergence damping-off disease symptoms were observed during 2008 and 2009 in four forest nurseries from northwestern Algeria (Relizane, Sidi Belabes, and Tlemcen departments). This disease occurred under cool conditions, and Aleppo pines were significantly affected, reducing seedling emergence. Disinfected segments, about 5 mm in length, from decayed root and collar, were cultured on CMA at 25°C. This oomycetal species was identified based on the species description in Pythium keys (3,4). For the molecular identification, PCR was used to amplify the ITS region of Pythium isolates. It was amplified with the flanking primers ITS1 and ITS4, and these products were directly sequenced. Sequence data were compared to known sequences deposited in the NCBI non redundant database to confirm morphological identification. A BLAST search identified U3CR, U7CR, U1RT, U2CR, U4CR, U14CR, U7RT, and U17RT isolates (GenBank Accession Nos. JX191921, 22, 27, 29, 31, and 33 to 35, respectively) as G. ultimum based on 100% similarity with corresponding sequence of the reference isolate no. UZ056 MAFF240024 (AB468781) (3). Phytopathogenicity testing was conducted in a petri dish and pot experiment. In the petri dish experiment, a 3 mm diameter plug was transferred from a 7-day-old CMA colony to the center of a CMA petri dish, with three replicates per isolate, and three control plates were inoculated with sterile agar plugs. After 72 h, 10 Aleppo pine seeds were placed equally spaced to 1 cm from the edge of each plug. After 7 days at 22°C in the dark, germination inhibition (46.1 to 87.6%) and root growth inhibition (62.3 to 92.2%) were calculated. In the control plates, germination failure (13.4%) and root length (27.7 cm) were observed. For the pot experiment, inocula were produced by adding a 5 mm diameter plug from a 7-day-old CMA culture to a previously sterilized 500 ml flask containing 237.5 g sand, 12.5 g cornmeal, and 80 ml SDW. Nine-day-old inoculum was mixed with sterile soil at a rate of 1:3 (v:v). Inoculum was transferred to 500 ml pot, and 10 Aleppo pine seeds were planted, with three replicates per isolate, and three control pots were used. After 2 weeks, all of the isolates tested caused typical symptoms of Aleppo pine Pythium damping-off, the percentage of inoculated plants that became infected was 36.6 to 83.3%. In the control pots, no infected plants were observed. To our knowledge, this is the first report of G. ultimum causing damping-off on Aleppo pine in Algeria, Africa, and the Mediterranean Region. Before, Aleppo pine damping-off caused by G. ultimum was reported in Australia (1). References: (1) R. P. Cook and A. J. Dubé. Host-pathogen index of plant diseases in South Australia. SADA, Melbourne, Australia, 1989. (2) D. F. Farr and A. Y. Rossman. Fungal Databases, Systematic Mycology and Microbiology Laboratory. ARS, USDA, Bestville, MD. Retrieved from http://nt.ars-grin.gov/fungaldatabases/ , June 24, 2012. (3) S. Uzuhashi et al. Mycoscience 51:337, 2010. (4) A. J. van der Plaats-Niterink. Stud. Mycol. 21:1, 1981.
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Lazreg, F., L. Belabid, J. Sanchez, E. Gallego, J. A. Garrido-Cardenas, and A. Elhaitoum. "First Report of Fusarium acuminatum Causing Damping-Off Disease on Aleppo Pine in Algeria." Plant Disease 97, no. 4 (2013): 557. http://dx.doi.org/10.1094/pdis-06-12-0608-pdn.
Full textAbstract:
The Aleppo pine (Pinus halepensis Mill.) is a conifer native to the Mediterranean region. In autumn and spring of 2008 to 2009, a survey of Aleppo pine seedling diseases was carried out in three forest nurseries from the Relizane, Sidi Bel Abbes, and Tlemcen departments in northwestern Algeria. Aleppo pine seedlings were potted from the soil. In all three nurseries, 1- to 2-month old seedlings showed symptoms of damping-off disease in pre- and post-emergence (collar rot) with a disease incidence of 64, 77, and 72%, respectively. Disinfected collar segments, about 5 mm in length, were plated on PDA and petri dishes incubated at 25°C. A Fusarium sp. was consistently isolated from tissues and all isolates were morphologically identified as Fusarium acuminatum Ellis & Everh. (teleomorph: Gibberella acuminata Wollenw.) according to Fusarium keys (2). Colony growth was 43 mm after 3 days on PDA; the aerial mycelium was white, developing a brownish tinge in the center on PDA; macroconidia were formed in orange sporodochia, broadly falcate, strongly septate, 3 to 5 septa, the apical cell with an incurved elongation, distinct foot shape, 3 to 4 × 20 to 50 μm; microconidia were usually absent for isolates other than F12SS1, reniform, septate, 5 to 6 × 6 to 10 μm, in monophialides; chlamydospores were formed in chains, 6 to 13 μm. For the molecular identification, ITS regions of Fusarium isolates were amplified with the primers ITS1 and ITS4, and products were directly sequenced in both strands using the same primers ITS 1 and ITS4. Sequences were compared to known sequences deposited in the NCBI non redundant database to confirm morphological identification. An NCBI BLAST search identified isolates F12SS1, F14SS3, F30SS3, and F25SR as F. acuminatum based on 100% similarity with corresponding sequences. GenBank Accession Nos. were JX114788, JX114785, JX114782, and JX114790, respectively. Pathogenicity tests were performed to fulfill Koch's postulates. Inocula were produced by adding a 5-mm diameter plug from a 7-day-old CMA petri dish culture to a previously sterilized 500-ml flask (237.5 g sand, 12.5 g cornmeal, 80 ml SDW), shaken over 9 days, and mixed with sterile soil at 1:3 (v:v). The inocula were transferred to a 500-ml pot, and 10 Aleppo pine seeds were planted with three replicates. After 1 month, all tested isolates caused typical symptoms on seedlings and the proportion of infected seedlings per each isolate was 50, 53.33, 56.66, 60, and 63.33%, respectively. There are many reports of F. acuminatum associated to conifer seedlings in nurseries (1,3) and most of them are conflicting because in some reports this species is considered non-pathogenic or only a seed contaminant and others consider it as a pathogen. To our knowledge, F. acuminatum is a first report on the Aleppo pine in northwestern Algeria, northern Africa. It is also the first report of this fungal species affecting the Aleppo pine throughout the world, and on conifers in Africa and the Mediterranean region. References: (1) D. F. Farr and A. Y. Rossman. Fungal Databases, Systematic Mycology and Microbiology Laboratory. ARS, USDA., Bestville, Maryland, USA. Retrieved from http://nt.ars-grin.gov/fungaldatabases/ , June 18, 2012. (2) J. F. Leslie and B. A. Summerell. The Fusarium Laboratory Manual. Blackwell Publishing, Ames, Iowa, USA, 2006. (3) D. W. Minter. Cybertruffle's Robigalia, Observations of Fungi and their Associated Organisms. Retrieved from http://www.cybertruffle.org.uk/robigalia/eng/ , June 18, 2012.
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Lazreg, F., L. Belabid, J. Sanchez, E. Gallego, J. A. Garrido-Cardenas, and A. Elhaitoum. "First Report of Fusarium equiseti Causing Damping-Off Disease on Aleppo Pine in Algeria." Plant Disease 98, no. 9 (2014): 1268. http://dx.doi.org/10.1094/pdis-02-13-0194-pdn.
Full textAbstract:
The Aleppo pine (Pinus halepensis Mill.) is a conifer native to the Mediterranean region. In 2008 and 2009, a survey of Aleppo pine seedling diseases was performed in three forest nurseries from Relizane, Sidi Bel Abbes, and Tlemcen provinces in northwestern Algeria. Aleppo pine seedlings showed symptoms of pre- and post-emergence damping-off disease, with an incidence of 64 to 77%. Four composite samples were taken from each location. Disinfested root and root collar segments, approximately 5 mm in length, were cultured on potato dextrose agar (PDA) and incubated at 25°C, and hyphal tips were transferred to PDA. Fusarium equiseti (Corda) Sacc. (teleomorph: Gibberella intricans Wollenw.) was identified from roots of two seedlings from the Sidi Bel Abbes nursery. Morphological identification was done according to Fusarium keys (2). PDA colonies with abundant, loosely floccose, whitish aerial mycelium and beige pigmentation were observed. Macroconidia with usually 5 to 6 septa, 31 to 45 μm long. A pronounced dorsiventral curvature, tapered and elongated apical cell, and prominent foot shape were observed. Microconidia were absent. Chlamydospores were produced in hyphae, most often intercalary, solitary, in pairs, frequently forming chains or clusters, globose (7 to 13 μm). To confirm the identity of this fungus, the internal transcribed spacer of F3RS1 and F19RS1 isolates of F. equiseti were amplified and sequenced using ITS1 and ITS4 primers (4), GenBank accession nos. JX114784 and JX114791, respectively. Those sequences bore 100% (HQ671182) similarity with sequences of F. equiseti in GenBank. Pathogenicity tests were performed to fulfill Koch's postulates. Inoculum was produced by adding a 5-mm-diameter plug from a 7-day-old CMA petri dish culture to a previously sterilized 500 ml flask (237.5 g sand, 12.5 g cornmeal, 80 ml sterile distilled water), shaken over 9 days at 25°C, and mixed with sterile sandy clay soil at 1:3 (v:v). Infested soil was then transferred to 500 ml pots, and 10 Aleppo pine seeds were planted per pot. A completely randomized design was used with three replicates per isolate and three control pots with a similar non-infested soil. After 1 month at 25°C the two tested isolates caused typical damping-off symptoms (collar rot) on seedlings and were re-isolated from recently infected tissues. The percentages of the inoculated plants that became infected were 59 to 65% among isolates (0% in control pots). To our knowledge, infection by F. equiseti is a first report on Aleppo pine in northwestern Algeria, Northern Africa, and globally, and on conifers in the Mediterranean region (1,3). In Algeria, F. equiseti is associated with black pepper (Piper nigrum L.) (3). These findings highlight the moderate impact of F. equiseti on the production of Aleppo seedling stock for reforestation activities in northwestern Algeria. References: (1) D. F. Farr and A. Y. Rossman. Fungal Databases, Systematic Mycology and Microbiology Laboratory. ARS, USDA, Beltsville, MD. Retrieved from http://nt.ars-grin.gov/fungaldatabases/ , February 20, 2013. (2) J. F. Leslie and B. A. Summerell. The Fusarium Laboratory Manual. Blackwell Publishing, Ames, IA, 2006. (3) D. W. Minter. Cybertruffle's Robigalia, Observations of Fungi and their Associated Organisms. Retrieved from http://www.cybertruffle.org.uk/robigalia/eng/ , February 20, 2013. (4) T. J. White et al. Page 315 in: PCR Protocols: A Guide to Methods and Applications. Academic Press, San Diego, 1990.
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Pleguezuelos, Juan M., Elisa Mora, Philip de Pous, et al. "Elusive but widespread? The potential distribution and genetic variation of Hyalosaurus koellikeri (Günther, 1873) in the Maghreb." Amphibia-Reptilia 32, no. 3 (2011): 385–97. http://dx.doi.org/10.1163/017353711x587732.
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AbstractThe genetic variability and the potential distribution under past (Last Glacial Maximum; LGM (MIROC and CCSM simulations)) and present conditions were studied for the anguid Hyalosaurus koellikeri, using analyses of two mitochondrial (ND1 and ND2) and one nuclear (PRLR) gene and species distribution modelling (SDM) including 19 geographical coordinates, covering most of its distribution range. Unexpectedly, the genetic results show that H. koellikeri presents a very low level of variability both in the mitochondrial and nuclear genes studied. The present predicted distribution of H. koellikeri revealed a large potential distribution in both north and eastwards directions, with suitable areas predicted in places where the species has never been reported before, as for instance the Rif Mountains in Morocco, as well as into most parts of northern Algeria and Tunisia. The LGM distribution is even larger compared to the present, with a continuous predicted distribution from Morocco to Tunisia, and even into Libya under the MIROC simulation. The results of the genetic and SDM analyses suggest that the now isolated populations from Debdou and Tlemcen have probably been in contact during the LGM, but its absence from both present and past predicted suitable areas is still a mystery. Hyalosaurus koellikeri depends mainly on closed deciduous forests (typically Cedrus atlantica and Quercus sp.) and open deciduous shrubland with high amounts of annual rainfall. The results of this study and the absence of recent sightings of the species outside the core distribution might indicate a regression of the species. Hence, a reevaluation of the conservation status of the species seems warranted.
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Dobrosielska, Alicja. "Sundythen – Olsztyn’s „pagus civitas”." Masuro-Warmian Bulletin 290, no. 4 (2015): 579–604. http://dx.doi.org/10.51974/kmw-142842.
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This text presents the history of Sundythen from Prussian times to the eighteenth century, indicated the place where probably was a missing village. The name of the village, which is confirmed by sources that Sundythen, Sanditten, Senditten, the other functioning in the literature and folk tales such as Sandyty, Sądy�ty whether Sędyty not exist in written sources or cartographic and should be considered slang. In documents written Sundythen appear for the first time in 1353. in the privilege of the city of Olsztyn. The village functio�ned much earlier, as its name indicates, and the content of Olsztyn location privilege. Sundythen be initially located in the urban forest in the vicinity of settlements and settlement. Not far from the early medieval set�tlement were discovered medieval ceramics, which may indicate existing in this place medieval settlements (XIV–XV.). None, however, by far, of any archaeological evidence the functioning of settlements in modern ti�mes, which can, however, bring on the basis of historical conditions. Written sources are silent about the fate of the village and its inhabitants after 1353. Until the nineteenth century. Only the maps of the sixteenth and seventeenth century. Prove that the village functioned in the modern period. Its destruction caused the death of all residents in the eighteenth century. Plague, as noted in the report Olsztyn magistrate from 1854. In the nineteenth century. Remaining after Sundythen ruins and annotations in municipal documents, the name is confirmed m. In. in the terms of roads (Senditter Wege), which once led to the village. The village is preserved in local memory, her name moved to the forest and settlement, which has been preserved in folk tales, writ�ten mostly in the twentieth century.
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Alaeva, I. P., and A. Yu Rassadnikov. "Archaeozoology of the Zvyagino-4 settlement of the Alakul Culture in the context of different cultural deposits." VESTNIK ARHEOLOGII, ANTROPOLOGII I ETNOGRAFII, no. 2(69) (June 15, 2025): 42–57. https://doi.org/10.20874/2071-0437-2025-69-2-4.
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This work is dedicated to the discussion of results of the study of archeozoological collection from the set-tlement of Zvyagino-4 (18th–17th centuries BC) of the Alakul Culture in the forest-steppe part of the Southern Trans-Urals. The paper presents the results of a basic archaeozoological study and provides the characteristics of the herd of domestic animals. A contextual analysis of animal bones from different layers of the site has been carried out. The complex of bones identifiable to the species is represented almost entirely by domestic ungu-lates. Cattle bones constitute 49 % of the assemblage, small cattle bones — 41 %, horse bones are in third place in terms of number — 6.7 %. The analysis of bone age markers reveals the presence of all age groups of live-stock within the settlement — from embryos/newborns to very old individuals. This may indicate both a full cycle of livestock breeding and comprehensive livestock management. For cattle, the main peak of slaughter was re-corded approximately within the age of 2.5–3 years, and for small cattle — within 1–2 years, which, of course, can be interpreted as a reflection of intensive meat exploitation of livestock, regardless of the sex of the animals. The quantitative ratio of animal species from different strata of the settlement did not provide significant variations, which indicates a common origin of the bones, and is associated with the kitchen waste of the Alakul population. At the same time, the comparative analysis of bones from different contexts revealed a significant difference in modification changes and bone fragmentation: a high degree of fragmentation of the material and the largest number of bones with thermal treatment have been recorded within the ashpit contents. The contextual analysis of the osteological collection of the Zvyagino-4 settlement suggests that the bone material from the ashpit layer underwent a special selection associated with grinding and overburning procedure.
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Zahra, Hadj Allal Fatima, Merzouk Abdessamad, and Aboura Rédda et Stambouli Hassiba. "PHYTOECOLOGY OF RIPISYLVES IN THE TLEMCEN REGION OF ALGERIA." PLANT ARCHIVES 21, No 1 (2021). http://dx.doi.org/10.51470/plantarchives.2021.v21.no1.145.
Full textAbstract:
Plant formations that develop on the edges of streams or bodies of water located in the border area between water and land. They are made up of specific stands due to the presence of water over more or less long periods, formations characteristic of the Oueds in our region. Riparian forests play an important ecological role. In particular, they offer specific natural habitats. They form biological corridors, increase the ecological connectivity of landscapes and therefore play a major role in maintaining biodiversity (forest and river biodiversity in particular), at regional scales. Finally, true filters, they protect the quality of the water and part of the wetlands of the watershed, the banks and the riparian soils.
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Nadia Zekri and Nesrine Bellahreche. "ASSESSMENT OF THE STATE OF SOME ANTI-EROSION INSTALLATIONS IN THE DAIRA OF HONAINE (WILAYA OF TLEMCEN – ALGERIA)." International Journal of Innovative Technologies in Social Science, no. 1(45) (January 16, 2025). https://doi.org/10.31435/ijitss.1(45).2025.3125.
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Water erosion is responsible for the degradation of more than half of the world's soils. In northern Algeria, it is widespread, particularly in the western region, which requires mechanical and biological developments to control it. The objective of this work is to evaluate the state and effectiveness of some anti-erosion developments, carried out in a coastal region: that of the Daira de Honaine (wilaya of Tlemcen). The methodology adopted was based on direct field observations, photo taking and data collection at the Forest Conservation in the wilaya of Tlemcen and the district of Remchi. The results obtained showed that most of the anti-erosion installations, carried out in 5 stations in the study region, are in very good condition. This demonstrates the perseverance of foresters, particularly in the creation of gabion thresholds and ridges, as well as the will of farmers in the good management and conservation of agricultural lands.
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Sarra, Bouayed Ibtissam, Hassani Faiçal, and Ghalem Sarra. "FLORISTIC DIVERSITY OF WITHANIA FRUTESCENS (SOLANACEAE) IN THE STATIONS OF ZENÂTA AIRPORT AND SEBAA CHIOUKH IN THE REGION OF TLEMCEN (WESTERN ALGERIA)." PLANT ARCHIVES 21, No 1 (2021). http://dx.doi.org/10.51470/plantarchives.2021.v21.no1.162.
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Vegetation cover is one of the main components of natural environments. Vegetation plays a fundamental role in the structure and functioning of ecosystems, of which it constitutes an expression of biological potential. The forest ecosystem of western Algeria, and more precisely that of the Tlemcen region, which is part of the Mediterranean domain, has suffered for several years a continuous regression, clearly visible and sometimes irreversible, and most often due to a combined action of climatic, ecological and anthropogenic factors. Faced with the gravity of this ecological situation in the region, the need for an action plan to preserve biodiversity is imperative in order to measure and quantify the degradation of biological resources. But such a plan can only see the light of day if the knowledge and management of the flora by the ecologists is mastered, with the major concern for the dynamics of the vegetation, because the vegetation of the Tlemcen region presents a good example. Study of plant diversity and an interesting synthesis of the natural dynamics of ecosystems, from the coast to the steppes.
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Benhachem, Fatima Zahra, and Djamila Harrache. "Chemical Speciation and Potential Mobility of Heavy Metals in Forest Soil Near Road Traffic in Hafir, Algeria." Journal of Health and Pollution 11, no. 30 (2021). http://dx.doi.org/10.5696/2156-9614-11.30.210614.
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Background. Different fractions of metals, of varying origin and reactivity, are present in sediments of forest soil. Forest ecosystems are privileged sites for the deposition of persistent organic pollutants carried by the atmosphere. Objectives. The present study describes the current state of metallic contamination around the Hafir forest, located southwest of Tlemcen, Algeria, based on analysis of total sediment mineralization and the speciation of each metal to examine the effects of emissions due to road traffic. Methods. The distribution and migration of ten heavy metals were studied, including cadmium (Cd), nickel (Ni), cobalt (Co), chromium (Cr), manganese (Mn), lead (Pb), copper (Cu), zinc (Zn), iron (Fe), and silver (Ag), and four major elements: potassium (K), sodium (Na), magnesium (Mg), and calcium (Ca) in the superficial horizon of forest soil (0–20 cm) at different road distances (0–1700 m), in two sampling campaigns in the dry and wet seasons around the Hafir forest, Algeria. Results. Bioavailability appears to be relatively low due to the small amount of metals present in the carbonate fraction and the alkaline pH. The impact of road traffic was observed in the variability of the concentrations of several trace elements in forest soil, such as Co, Mn, Ni, Zn, Pb, Ag, Cd. They were generally observed at very high levels along the roadside due to dry atmospheric deposition. Conclusions. The high levels of metals in the carbonate, reducible and residual phases indicate a direct influence on the environment stemming from road traffic near the forest as well as contamination from rainfall in the area. Competing Interests. The authors declare no competing financial interests.
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Amina, Damerdji. "Diversity of Malacofauna on Marrubium Vulgare L (Lamiaceae) and Juniperus Oxycedrus L(Cupressaceae) in the Mount of Tlemcen (Oranie, Algeria)." Agricultural Research & Technology: Open Access Journal 26, no. 4 (2022). http://dx.doi.org/10.19080/artoaj.2022.26.556345.
Full textAbstract:
The region of Tlemcen is located in the North-West of Algeria, whose climatic impact is reflected in the degradation of the forest into matorral, an open formation made up of plant species such as: Cistaceae, Lamiaceae (horehound, stoeckade lavender) and the juniper. We propose to carry out an approach of the diversity of the malacofauna found on 2 plant species namely Marrubium vulgare (Lamiaceae) and Juniperus oxycedrus (Cupressaceae). The malacological richness is estimated at 9 for oxycedar juniper and 7 for horehound. It is divided into 3 families: Milacidae, Helicidae and Subulinidae. Two species of Milacidae are found on the oxycedar. The 3rd family comprises a single species, being Rumina decollata. Concerning the family of Helicidae, the most diversified has 2 sub-families: those of Helicinae and Helicellinae. The 1st sub-family has 6 species on oxycedar and 5 species on horehound. The 2nd subfamily includes only one species, namely Helicella terveri on horehound. The seasonal distribution according to the specific richness of Gastropods is shown. We are looking for the malacological species specific to each of the two plant species and the species that are common to them. Finally, the vertical distribution of gastropods is given.
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Appiagyei, Bright Danso, Latifa Belhoucine-Guezouli, Enoch Bessah, and Boutkhil Morsli. "Simulating land use and land cover change in a semi-arid region from 1989 to 2039: the case of Hafir-Zariffet forest, Tlemcen, Algeria." GeoJournal, March 18, 2023. http://dx.doi.org/10.1007/s10708-023-10853-2.
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