Revue des bio ressources

CONTRIBUTION A L’ETUDE DES MODES D’USAGE DES PARCOURS DE LA REGION DE GHARDAÏA (SAHARA SEPTENTRIONAL ALGERIEN)

2026-01-13T09:16:10+01:00

The aim of this study is to determine how grazing land is used and managed, based on field surveys in
two representative areas of the Ghardaïa region, which is renowned for its livestock farming in the full sense of
the term. As a result of the exploratory investigations, which reached 20% of all livestock farmers, and the
approach of support structures, we were able to draw the following conclusions: i/- The nomadic system has
evolved as breeders have settled down; ii/- Transhumance of livestock, particularly small ruminants, near
watering holes is not the ideal solution, as it leads to the degradation of grazing land as a result of longer grazing
periods; iii/- the dromedary excels in adapting to harsh conditions and adopts the practice of roaming in search of
grass when conditions are restrictive; iv/- the extension of agricultural areas to the detriment of grazing land; v/-
damage to the pastoral ecosystem through the excessive uprooting of perennial species destined for speculative
use. Finally, in the absence of adequate rangeland management, the alarm bells are ringing; action is needed to
preserve and promote these areas, which are so important both for the needs of the animals and for the ecological
balance of the pastures

ETUDE PARASITOLOGIQUE DES FIENTES DU PIGEON RAMIER Columba palumbus Linnaueus 1758 DE LA REGION DE LARBAA ET OULED YAÏCH (MITIDJA, ALGERIE

2026-01-13T09:49:23+01:00

The present study focuses on endoparasites that infect the wood pigeon (Columba palumbus), captured in two stations in the region of Mitidja: Larbaâ and Ouled Yaïch, during winter and spring. The parasitological analysis, carried out using different techniques, allowed to identify 12 species of endoparasites. Eimeria sp was the most common (42%), followed by Ascaridia sp (33.33%), Endolimax sp and Tetrameres sp (29.17% each) and Strongyloides sp (20.83%). The other species were less represented. In addition, two unusual parasites were detected: Pseudolimax sp and Ancylostoma sp. This study highlights the potential risk to human health and the environment posed by the dejection of the ramie pigeon, in particular because of its frequent proximity to populated areas

IMPACT OF DROUGHT STRESS ON TOTAL PHENOLS, BUTANOLSOLUBLE POLYPHENOLS, AND VANILLIN IN THREE FABA BEAN (VICIA FABA L.) CULTIVARS

2026-01-13T09:56:04+01:00

The phenolic makeup of legumes plays a key role in their nutritional quality, antioxidant capacity, and how they
respond to environmental stress. This study investigated how drought stress influences total phenols (TP), butanol- soluble
polyphenols, and vanillin- reactive compounds in three faba bean (Vicia faba L.) cultivars: Reinablanca, Aquadulce L., and
Alfred. Plants experienced both traditional (T) and selected (S) post- harvest treatments to examine how genotype and
drought stress affect phenolic metabolism. TP levels ranged from 46. 53 mg/g DM in Reinablanca T to 92. 68 mg/g DM in
Alfred S, with Alfred consistently showing the highest levels under drought conditions. Butanol-soluble polyphenols
followed a similar trend, reaching 109.35. 35 mg/g DM in Alfred S, which indicates a strong link between TP and
polymerized phenolics. In contrast, vanillin content dropped under the selected treatment across all cultivars, with
Reinablanca T having the highest level at 41.40 mg/g DM. This suggests a metabolic trade- off where stress- driven
phenolic production may limit precursors for flavor- related compounds. The different cultivars responded uniquely: Alfred
showed the highest potential for bioactive properties, Reinablanca maintained higher vanillin levels under traditional
treatments, and Aquadulce L. exhibited intermediate traits but had higher butanol- soluble phenolics during drought stress.
These findings show that drought stress boosts antioxidant phenolics while decreasing flavor- related vanillin, reflecting an
adaptive shift in metabolism. Overall, Alfred stands out as a promising cultivar for functional foods or nutraceuticals owing
to its strong antioxidant properties, while Reinablanca might be better suited for products focused on sensory qualities. This
research offers valuable insights into how stress affects phenolic metabolism in legumes and guides strategies for selecting
cultivars and managing post- harvest treatments to improve both nutritional and sensory qualities

ANALYSIS OF ALEPPO PINE VITALITY AT CHETTABA USING NDVI

2026-01-13T10:04:56+01:00

The study was carried out in the Chettaba state forest, located in the Constantine region (north-east Algeria), to analyze the dendrometry structure and ecological dynamics of Aleppo pine (Pinus halepensis Mill.) stands in a semiarid Mediterranean context. Three representative stations were selected to characterize structural and physiological variations in the stands, based on field measurements and spectral data from the Normalized Difference Vegetation Index (NDVI) collected in 2024. The dendrometry results show a density of 312-725 stems/ha and a basal area of 22.46-41.32 m²/ha. This progression reflects the accumulation of woody biomass and structural differentiation, with differentiation increasing with increasing competition. Low-density stands are distinguished by higher average diameters (D = 29.85 cm), reflecting mature, well-balanced individuals, while denser stands feature more slender stems and marked competition for light. The height/diameter (H/D) ratio, ranging from 31 to 39, indicates satisfactory mechanical stability and good structural balance. NDVI analysis reveals apparent seasonal variability, with a peak in vegetative vigor in June (mean NDVI = 0.248), followed by a decline in August and October (NDVI ≈ 0.19), linked to summer water stress and leaf senescence. Statistical tests (Friedman and Nemenyi) confirm highly significant differences between periods of active growth and phases of vegetative rest. The convergence of dendrometry and spectral analyses reveals a positive correlation between stand vigor and NDVI, underscoring that medium-density stands (around 400 stems/ha) exhibit the highest productivity and ecological resilience. These results demonstrate the relevance of integrating field measurements and satellite indicators for monitoring forest vitality and the sustainable management of semi-arid Mediterranean ecosystems

ASSESSING GREEN SPACE FRAGMENTATION AND ACCESS IN CONSTANTINE (ALGERIA)

2026-01-13T10:09:26+01:00

Urban green spaces are essential for biodiversity, ecosystem services, and human well-being in rapidly growing
cities. This study examines how green spaces are spread out, fragmented, connected, and accessible in Constantine, a
Mediterranean town with a historic center and expanding suburbs. Using GIS-based spatial analysis and resident surveys,
green spaces were categorized into ecological cores (35%), linear and scattered elements (20%), and peripheral natural areas
(45%). The analysis found 120 separate patches, low corridor density, and distances between patches of 500-800 m in
central regions compared to 1.5 km in the outskirts. About 65% of residents can reach a green space within 10 minutes, but
around 40% are unhappy with the quality, especially in peripheral neighborhoods. Fragmentation and limited connection
reduce ecosystem services, and spatial inequalities limit social benefits. These results emphasize the need for integrated
planning of urban green infrastructure, including protecting core areas, improving small and private patches, and creating
ecological corridors to improve both environmental and social benefits. This study offers a transferable framework for
designing sustainable urban green networks in Mediterranean and similar urban settings.

ASSESSING GREEN SPACE FRAGMENTATION AND ACCESS IN CONSTANTINE (ALGERIA)

2026-01-13T10:14:25+01:00

Lichens are fungi mainly Ascomycetes that live in association with a population of green algae or cyanobacteria. They are considered as biological indicators to analyse the fate and health of forest ecosystems. The present work consists of inventing epiphytic lichens in the Chrea forest, and using them as bio-indicators for the estimation of air quality. After the choice of the five study stations according to their phorophyte and their altitude, a lichenic survey is carried out. After the choice of the five study stations according to their phorophyte and their altitude, a lichenic survey is carried out. The estimation of the air quality is determined according to the method of KIRSCHBAUM and WIRTH. Lichen diversity showed the presence of 16 species with an abundance of 52 lichens. As for the estimation of the air quality, the calculation of the index reveals the dominance of two high and medium classes

DEMOGRAPHIC STRUCTURE AND STAND DYNAMICS OF THE EL HAMIMET FOREST MODELED BY THE WEIBULL DISTRIBUTION

2026-01-13T10:22:04+01:00

This study involved dendrometry analysis and modelling of the demographic structure of stands in the El Hamimet forest (Oum El Bouaghi, Algeria), dominated by Aleppo pine (Pinus halepensis Mill.) and green cypress (Cupressus sempervirens L.). Four representative plots were studied in order to assess the variability of dendrometry and structural parameters. The average diameters observed ranged from 13.4 to 22.8 cm, and the average heights ranged from
3.2 to 4.5 m, reflecting marked heterogeneity between young and mature stands. The average basal area ranged from 15.2 to 27.6 m²/ha, with a density of 820-1,150 stems/ha, reflecting varying conditions of competition and growth. By fitting the diameter and height distributions to a three-parameter Weibull distribution, we characterized the demographic structure in detail. The values of the shape parameter (k) ranged from 1.46 (P2) to 2.70 (P4), indicating structures ranging from young, regenerating stands to mature, homogeneous stands. The scale parameter (λ), ranging from 3.22 to 4.53, reflects the dispersion of heights and diameters across development stages. These results show that plots P1 and P4 have stable structures with a predominance of mature trees, whereas P2 and P3 exhibit active regeneration dynamics. All of these observations highlight the structural complexity and functional diversity of the El Hamimet forest. The use of Weibull’s law proved particularly effective for interpreting the distributions of heights and diameters, enabling assessment of the dynamics of stand growth and succession. These results provide an essential basis for guiding silvicultural practices toward sustainable, resilient management of Mediterranean forest ecosystems

VASCULARISATION ARTERIELLE DE LA MAIN : ETUDE ANGIOSCANNER, VARIATIONS ANATOMIQUES ET APPLICATIONS CHIRURGICALES

2026-01-13T10:28:41+01:00

The vascularized hand, provided by the superficial and deep palmar arches, shows significant anatomical variability that can influence flap planning in reconstructive surgery. CT angiography has emerged as a reliable tool for preoperative vascular assessment. This retrospective descriptive study, conducted between 2015 and 2024, included 94 adult patients treated for hand reconstruction at Annaba University Hospital. Each patient underwent a preoperative CT angiography. Vascular anatomical data, types of arterial dominance, and surgical outcomes of the flaps used were analyzed. A complete superficial palmar arch was found in 87% of cases and a complete deep arch in 75%. Ulnar dominance (type U10.R0 or U7.R3) represented 91% of vascular profiles. CT angiography allowed for comprehensive evaluation in 97% of cases, with intraoperative concordance in 92%. The flaps used (Cross-finger, Moeberg and O’Brien, and Faucher’s “kite” flap) were selected according to the angiographic findings, providing satisfactory functional coverage in all cases. CT angiography represents a highly valuable preoperative tool for vascular mapping of the hand. It enables individualised surgical planning, enhances flap safety, and optimises outcomes in post-traumatic reconstructive surgery.

SARCOME D'EWING EPIDURAL : DIAGNOSTIC, PRISE EN CHARGE ET RESULTATS CHIRURGICAUX AU SERVICE DE NEUROCHIRURGIE DU CHU D'ANNABA

2026-01-13T10:34:32+01:00

Ewing's sarcoma is a rare malignant tumor in children and adolescents, most often osseous. Its spinal
epidural location is scarce (<1%) and constitutes a neurological emergency. This study aims to describe the
clinical, radiological, and evolutionary characteristics of this particular entity, and to discuss its management in
light of international data. We conducted a retrospective study involving 5 patients aged 8 to 32, who were
followed at Ibn Rochd University Hospital in Annaba between 2009 and 2023. Demographic, clinical, imaging,
histological, and therapeutic data were analyzed. All patients underwent decompression surgery, followed by
chemotherapy according to the VDC/IE protocol. Survival was assessed descriptively. Three patients were female
(60%) and two were male (40%). All presented with spinal cord compression. RI allowed for rapid detection, and
diagnostic confirmation was obtained through histology in 100% of cases patients presented with metastases at
diagnosis. The progression Summary was marked by partial or complete neurological recovery in 4 patients. At a
median follow-up of 18 months, the overall survival was 80%. A local recurrence was observed. The difference
according to sex was not significant (p =0.67). Epidural Ewing's sarcoma remains a rare but formidable form
requiring urgent multidisciplinary management. Our series, although limited, confirms the effectiveness of a
combined surgery-chemotherapy treatment. Early diagnosis remains crucial for functional prognosis. The
establishment of multicentric registries is necessary to better understand this entity and improve its management in
resource-limited countries

CAMEL GELATIN PRODUCTION IN ALGERIA: FROM BIOLOGICAL POTENTIAL TO INSTITUTIONAL AND ECONOMIC CONSTRAINTS

2026-01-13T10:39:22+01:00

Gelatin is a strategic material for food, pharmaceutical, cosmetics, and biotechnology industries. Despite substantial camel resources, Algeria remains dependent on gelatin imports, causing significant hard currency drainage. This study analyzes the potential for valorizing camel slaughter by-products for gelatin extraction and identifies constraints hindering establishment of a sustainable national production project. Official data from the Ministry of Trade and Export Promotion revealed that Algeria's gelatin imports in 2021 reached 1.26 million $ (6,057 tons), while exports represented only 1% of trade. Primary demand concentrated in food industries (>1,000 tons annually), pharmaceutical sectors (60 tons), and electronics. Camel meat production in 2021 generated approximately 22,500 tons of bones annually, theoretically enabling production of 5,175 tons of gelatin at 22% extraction rate, alongside 794 tons of hides nationally. Critical constraints preventing project implementation include absence of proper collection and preservation protocols, lack of cold chain infrastructure, inadequate sanitary quality controls, and minimal coordination among value chain stakeholders. A comprehensive national strategy integrating industrial security and bioeconomy principles is required, with coordinated involvement of Agriculture, Industry, and Higher Education ministries, supported by pilot projects to transform biological potential into sustainable economic development in arid regions.