scholarly journals Bibliographical note on the syntaxonomy of the vegetation of Tlemcen, Hafir, Moutas and its reserve (North-western Algeria)

2020 ◽  
Vol 27 (2) ◽  
pp. 345-358
Author(s):  
Naima Bouazza ◽  
Kaouider Cherifi ◽  
Brahim Babali ◽  
Mohammed Bouazza
Keyword(s):  
Plant Cover ◽  
Illegal Logging ◽  
Negative Consequences ◽  
Bibliographical Note ◽  
Tree Structures ◽  
Degradation Factor ◽  
Plant Taxon ◽  
Western Algeria ◽  
North Western ◽  
Evolution Of Vegetation

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)

Chemical composition, antibacterial and antioxidant activities of Juniperus oxycedrus essential oils from North Western Algeria

2018 ◽  
Vol 7 (2) ◽  
pp. 74-83
Author(s):  
Cherifa Zahaf ◽  
Djilali Achour ◽  
Meriem Mokhtar ◽  
Moussa Brada
Keyword(s):  
Essential Oils ◽  
Steam Distillation ◽  
Antioxidant Activities ◽  
Inhibition Zone ◽  
Inhibitory Effect ◽  
Juniperus Oxycedrus ◽  
Germacrene D ◽  
Western Algeria ◽  
North Western ◽  
Β Carotene

The aim of the current study was to identify the essential oils of Juniperus oxycedrus from North Western Algeria (Mostaganem) by gas chromatography coupled to mass spectrometer (GC-MS), and to evaluate their antibac-terial and antioxidant activities. Extraction was carried out by two processes, hydrodistillation (HD) and steam distillation (SD). Analysis by GC-MS led to the identification of 38 components using both methods. HD was found to be the best process for the extraction of Juniperus essential oil, and the ma-jor identified compounds were: germacrene-D (38.28%), followed by α.-pinene (17.66%), and δ-cadinene (5.91%). In the antibacterial test, SD oil had a higher inhibitory effect. The strain Staphylococcus aureus was the most sensitive with an inhibition zone of 15.25 mm and a minimum inhibitory concentration (MIC) of 0.25 mg/mL. The antioxidant activity of J. oxycedrus es-sential oils obtained by HD was more important than SD (IC50= 19.52 mg/mL and IC50= 38.62 mg/mL) with DPPH and β-carotene bleaching tests respec-tively. Essential oils of J. oxycedrus could therefore represent good candidates to be used as antioxidant and antibacterial agents.

scholarly journals Ammonoids from the Dalle des Iridet of the Mouydir and Ahnet (Central Sahara) and the Formation d'Hassi Sguilma of the Saoura Valley (Late Tournaisian–Early Viséan; Algeria)

Fossil Record ◽  
2010 ◽  
Vol 13 (1) ◽  
pp. 203-214 ◽  
Author(s):  
D. Korn ◽  
V. Ebbighausen ◽  
J. Bockwinkel
Keyword(s):  
New Species ◽  
Early Carboniferous ◽  
North African ◽  
The North ◽  
Two New Species ◽  
Western Algeria ◽  
Central Sahara ◽  
North Western

Four ammonoid species are described from the Early Carboniferous (Mississippian) Iridet Formation of the Ahnet and Mouydir (Central Sahara, Algeria); three of which are new: <i>Eurites temertassetensis</i> n. sp., <i>Trimorphoceras teguentourense</i> n. sp., and <i>Trimorphoceras azzelmattiense</i> n. sp. The species can be attributed to the North African <i>Ammonellipsites-Merocanites</i> Assemblage (<i>Fascipericyclus-Ammonellipsites</i> Genus Zone; Late Tournaisian to Early Viséan). Additionally, the two new species <i>Ammonellipsites sguilmensis</i> n. sp. and <i>Muensteroceras beniabbesense</i> n. sp. are described from the time equivalent Hassi Sguilma Formation of the Saoura Valley (north-western Algeria). <br><br> doi:<a href="http://dx.doi.org/10.1002/mmng.200900012" target="_blank">10.1002/mmng.200900012</a>

scholarly journals Generalist solitary ground-nesting bees dominate diversity survey in intensively managed agricultural land

2019 ◽  
pp. 1-12 ◽  
Author(s):  
Erica Juel Ahrenfeldt ◽  
Johannes Kollmann ◽  
Henning Bang Madsen ◽  
Hans Skov-Petersen ◽  
Lene Sigsgaard
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
Functional Diversity ◽  
Agricultural Land ◽  
Plant Cover ◽  
Flowering Plant ◽  
Negative Consequences ◽  
Insect Pollination ◽  
Wild Bees ◽  
Ground Nesting

In Western Europe agricultural management was intensified in the period 1950–2010 with negative consequences for ecosystem services, such as pollination, especially in countries with a large proportion of agriculture. Farmland represents 66% of the Danish landscape, but little is known about wild bees despite that 75% of the country’s wild and cultivated plant species depend on insect pollination. Strawberry (Fragaria × ananassa) gains considerable benefits from insect pollination and abundance, species richness and functional diversity, are all important elements. We surveyed the diversity of wild bees during strawberry flowering by sampling bees with pan-traps along permanent margins bordering strawberry fields on six organic and six conventional farms in eastern Denmark and compared the results of the survey with that of sampling site farming practice and field margin forage availability. The majority of bees sampled were polylectic solitary ground-nesting bees known to forage on species of the rose family. This indicates that these bee species are potential pollinators of strawberries, and the low number of specialized bees suggests that the bee community was affected by the simplified landscapes. Temporal trends in abundance, species richness, and body size of the bees, suggest that the functional diversity of pollinator assemblages available differed for early- and late-flowering strawberries. Fewer plants species and a lower plant cover were found in the margins of sprayed fields. Abundance and diversity of the wild bees were neither correlated with the use of herbicides and insecticides, nor with plant species richness or flowering plant cover.

scholarly journals Chemical Variability of the Essential Oil Isolated from Aerial Parts of Tetraclinis Articulata from North-Western Algeria

2015 ◽  
Vol 10 (8) ◽  
pp. 1934578X1501000 ◽  
Author(s):  
Maghnia Boussaïd ◽  
Chahrazed Bekhechi ◽  
Fawzia Beddou ◽  
Daoudi Chabane Sari ◽  
Ange Bighelli ◽  
...  
Keyword(s):  
Essential Oil ◽  
Bornyl Acetate ◽  
Pca Analysis ◽  
Aerial Parts ◽  
Group I ◽  
Tetraclinis Articulata ◽  
Chemical Variability ◽  
Germacrene D ◽  
Western Algeria ◽  
North Western

The objective was to investigate the yield and chemical composition of 50 essential oil samples isolated from leaves and flowers of Tetraclinis articulata harvested in eight locations (coastal township and highlands) of Tlemcen Province (North-Western Algeria). Essential oil yields varied drastically from sample to sample (0.03 to 0.86%, w/w). No direct correlation was observed between the yield and the altitude of the harvest areas. The oils consisted mainly of monoterpenes: α-pinene (9.2–56.5%), bornyl acetate (1.2–45.1%), camphor (0.5–40.3%), borneol (0.2–12.9%), limonene (3.6–12.5%), and myrcene (1.6–9.7%). Sesquiterpenes were represented by germacrene D (up to 14.2%) and (E)-β-caryophyllene (up to 13.3%). PCA analysis of the data allowed the distinction of two groups within the samples. The composition of group I (9 samples) was dominated by camphor, (Mean = 30.9%) followed by α-pinene (M = 19.1%) and bornyl acetate (M = 11.4%). Group II was divided into two sub-groups. Samples of sub-group IIA (8 samples) contained mainly α-pinene (M = 45.4%). Samples of the largest group IIB (33 samples) were characterized by similar contents of α-pinene (M = 28.2%) and bornyl acetate (M = 24.5%) and the occurrence of camphor to a lesser extent (M = 10.0%).

RATE OF MIGRATION OF NATURAL RADIONUCLIDES IN SOIL-PLANT COVER OF THE NORTH-WESTERN PRECASPIAN REGION

2017 ◽  
Vol 73 (6) ◽  
Author(s):  
Shamil Salikhov ◽  
Tatiana Asvarova ◽  
Gasan Gasanov ◽  
Aishat Abdulayeva ◽  
Kamil Hajiyev ◽  
...  
Keyword(s):  
Natural Radionuclides ◽  
Plant Cover ◽  
The North ◽  
North Western

Investigating the Blusa: The Cultural and Sartorial Biography of an Algerian Dress

Costume ◽  
2014 ◽  
Vol 48 (1) ◽  
pp. 60-81
Author(s):  
Leyla Belkaïd
Keyword(s):  
Urban Women ◽  
Colonial Period ◽  
Full Length ◽  
Cultural Assimilation ◽  
Object Based ◽  
Western Algeria ◽  
French Colonial ◽  
Different Cultures ◽  
The Relationship ◽  
North Western

This essay describes the evolution of the garment known as a blusa, worn by urban women in north-western Algeria. The blusa, a full-length dress with short sleeves, was conceived and developed in the cities of Tlemcen and Oran. It incorporates locally meaningful traditions as well as fashion styles in conjunction with different cultures. Its transformation illustrates how Algerian women resisted cultural assimilation through dress while creatively appropriating western European textiles, techniques and aesthetics in their clothing, during the French colonial period (1830–1962) and its aftermath. The exploration of the contemporary blusa variations reveals how the relationship between clothing and identity is still highly complex in Algerian cities. To date, the invention, the rituals, the design, and the production of the blusa dress has been little studied. This paper reconstitutes an historical puzzle based on recent object-based research and anthropological investigations. It seeks to interpret the blusa as an interface between tradition and modernity.

Evolution of vegetation under intensive grazing: Two examples in North-western Italian mountains

1989 ◽  
Vol 27 (1-4) ◽  
pp. 347-359
Author(s):  
M. Acutis ◽  
G. Pascal ◽  
A. Reyneri ◽  
C. Siniscalco
Keyword(s):  
North Western ◽  
Evolution Of Vegetation
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