Résumé: ABSTRACT The purpose of this study is twofold first, to identify the pollen that most likely can induce allergic symptoms second, a review of epidemiological records was undertaken from 2013 to 2017 with the aim of determining the prevalence of allergy in the Seraidi region “bouzizi-djnen el bey” in the Annaba Algeria region. The linking between the flowering schedule of the characteristic species of the region (Seraidi) and the results of the analysis has made it possible to identify the species likely to be at the origin of the recorded manifestations of allergy. These are the pollens of certain trees (the oak which occupies the first position, Erica, Pine, Olive tree), the pollens of certain spontaneous herbaceous plants (of the family Compositae, Urticaceae (Parietal)), and pollen from certain grasses (of the family Poaceae (Fecal)). The results of the epidemiological surveys carried out showed that the average allergy due to pollen was 198 in May for conjunctivitis and 100 in April for rhinitis and asthma. Overall, the maximum symptom frequency values recorded in March-April, May and August-November correspond to the maximum flowering of characteristic species. Seasonal variations in symptoms reveal the probable role of pollens in their induction.

Résumé: Abstract. Monitoring soil quality in irrigated areas is essential for assessing the sustainability of production systems. In this respect, the spatial variability of the properties of irrigated soils is a mean to know the evolution of the latter. This study aims to determine the spatial variability of soil organic matter, salinity, pH and active limestone using a geostatistical approach. The present study was carried out in the region of Zelfana located in the Algerian central Sahara, the samples were collected from a depth of 0 to 30 cm and analysed for organic matter, salinity, pH and active limestone. The analytical results show that the soil is very poor in organic matter, very salty, alkaline to very alkaline and moderately calcareous. The geostatistical analysis revealed various patterns and levels of spatial distribution of the studied properties. The results showed a weak spatial dependence for organic matter, moderate for pH and salinity and strong for active limestone. The variographic analysis showed that the nugget effect is weak for organic matter and pH, moderate for salinity, while active limestone does not show a nugget effect. The range varies from 75 meters for salinity to 299 meters for organic matter, confirming the validity of the adopted sampling and allowing the optimization of future sampling plans. The Arcgis autoKriging function was used to select the best theoretical variogram model from those most commonly used in geostatistics (Gaussian, spherical, exponential and circular). This model was used to produce the spatial variability maps using ordinary kriging. Spatial variability of soil properties is influenced by agricultural intensification, something that must be taken into consideration for integrated and sustainable land management in similar regions. Keywords. Geostatistics, Spatial variability, Organic matter, Salinity, pH, Active limestone

Résumé: Abstract The sustainability of soils is a major concern as they provide multiple functions such as agriculturalproduction, water filtration and biotope for livingorganisms. Crop sustainability in an arid environmentrequires the study of the components of this environment. Our work carried out in the region of Zelfana(Sahara Desert), 60 km far from the capital of Ghardaïa province, aims to diagnose and characterize the soilchanges produced due to the cultivation of palm trees. For this purpose, systematic sampling was carriedout and soil data measured on plots cultivated for 60 years, comparing with those of an uncultivated area(control). The undisturbed soils have coarse textured, low organic matter content, are moderately to highlycalcareous, and present low to high salinity and alkaline. The results of the cultivated topsoil and theannual rate of change showed that there was a highly significant decrease in total limestone and pH, and ahighly significant increase in electrical conductivity and organic matter due to the cropping system. Thesechanges are justified by the effect of the years of cultivation and the farmers’ management (i.e. addition oforganic manure and the flood irrigation).

Résumé: Abstract Soils of semi-arid climates undergo organic carbon loss, which in turn affects their agricultural potential. Geostatistics is often used as an interpolation tool to thoroughly describe SOC spatial distribution. To focus on soil organic carbon (SOC) depletion, the Tiffech watershed (Northeast of Algeria), an economically important agricultural area, was chosen due to intensive agricultural practices, decline of forests and occurrence of erosion. The present study aimed to predict the spatial variation of SOC in Tiffech watershed using geostatistics and a Geographical Information System (GIS) software, comparing the performance of two geostatistical methods—Ordinary Kriging (OK) and Regression Kriging (RK)—also assessing the role of auxiliary variables in improving the prediction accuracy and highlighting the role of land cover in SOC storage. The SOC content in Tiffech soils was determined on 42 soil samples from the surface layer (0–10 cm) collected all over the study area and the results were used to estimate SOC density in non-sampled locations. The prediction efficiency of the two methods was evaluated by calculating the Mean Error (ME), the Root Mean Square Error (RMSE) and the Root Mean Square Standardized Error (RMSSE). The interpolation results showed that SOC distribution in the study area was correlated to the topography, the clay index, and general landscape features. SOC content increased northwards in the area, ranging from 0.53 to 6.9 kg·m−2 in relation to land use. As expected, maps figured a good conservation status of SOC stocks in areas with dense vegetation; conversely poor SOC contents were estimated where land degradation factors take place. Cross-validation results showed an outperformance in the interpolation accuracy of RK on OK after the introduction of environmental variables, with an RMSE value of 0.02 versus 0.81. This suggests a higher efficiency of RK in predicting SOC content across the Tiffech area in comparison with OK, confirming that introducing some auxiliary data correlated to the target variable in SOC estimation, considerably improved the interpolation accuracy. Keywords Ordinary krigingRegression krigingSemiarid soilsSpatial variabilityLand use

Résumé: The study was aimed to assess the ecotoxicological impact of anthropogenic activities on soil quality by using the land snail Helix aspersa as a bioindicator. Soil samples and snails were collected from several sites of northeast Algeria during spring and winter, 2017. All sites were chosen in this study for the reason of their proximity to industrial factories as a potential source of heavy metal soil contamination. The concentration of heavy metals in soil samples was analyzed using the X-ray Fluorescence (XRF) spectrometer (Thermo Scientific Model Niton FXL 950) since the three metals of the highest levels in soil samples were examined in Helix aspersa hepatopancreas and feet by means of the atomic absorption spectrophotometry. Also, the highest levels of heavy metals were noticed during spring in Helix aspersa of the closest sites to the potential sources of pollution. These results are correlated with the physico-chemical characteristics of soil (texture, organic matter, pH Water, conductivity, limestone, and porosity) in each site. Keywords: Contamination, Heavy metals, Helix aspersa, North-East Algeria, Biotope

Résumé: La gestion des déchets solides est l’un des problèmes les plus difficiles à gérer par les pays en développement qui souffrent de graves problèmes de pollution causés par la production de grandes quantités de déchets. En Algérie, la mise en décharge est considérée comme la filière principale d’élimination des déchets. Le pays compte plus de 3 200 décharges sauvages implantées à travers le territoire national. Les résultats obtenus ont montré que la majorité des déchets sont constitués de métaux et de plastiques (29 et 30 %). Ces derniers sont considérés comme sources majeures de pollution des sols et de l’eau, car ils peuvent ^etre des générateurs de polluants persistants tels que les métaux lourds qui ont des conséquences néfastes pour l’environnement. Cependant, ces déchets peuvent ^etre récupérés et valorisés. Les déchets organiques, textiles et papiers considérés comme biodégradables correspondant à plus de 27 % du poids de la composition des déchets, et présentent un fort potentiel de récupération. Les autres déchets (verre et déchets de construction) représentent de faibles portions considérées comme banales et peuvent être récupérés et réutilisés. De l’analyse de ces résultats, il ressort que la décharge de Kef Oum Teboul recèle un fort potentiel de récupération et recyclage, et ses dépotoirs, qui abritent une biodiversité riche et diversifiée, doivent être protégés.

Résumé: Abstract Wadi Bounamoussa, located in El Tarf (extreme Northeast Algerian) which has an agricultural vacation. During two seasons (winter and summer), the sampling of surface waters of nine stations along wadi Bounamoussa is analyzed. In order to evaluate preliminarily the pollution of surface water, the study methodology carried out in order to check the current state of water chemistry, its evolution over time and in space depending on the variation of physicochemical parameters of water. The results of physicochemical analyses of waters samples of our study area shows that are very poor in soluble and moderately mineralized and accentuated with a neutral appearance require certain precautions such as leaching, which can reduce the yield of sensitive plants and cause slow salinization of soil hence the need for this research. We got the same order of abundance decreasing for both seasons as follows: Na+ > Ca+2 > Mg+2 > K+ and Cl- > SO42 > NO3- > NO2- with absence of carbonates and bicarbonates. The use of graphical water diagrams made it possible to define the dominant ions responsible for chemical facies of waters and the geological formations at the origin of these facies. The results of statistical analysis confirm those obtained in laboratory and reveal, firstly a variability between intra-period stations (inter-site), and secondly, a potential variability between two periods (inter-period variability). The physicochemical characteristics of this surface water show that it is appropriate to irrigation and agriculture.

Résumé: Notre travail consiste à étudier l'influence de la qualité des eaux d’irrigation sur les paramètres physico-chimiques du sol des palmeraies de Ghardaïa (au centre d'Algérie) à savoir : le pH, la conductivité électrique, le calcaire total et le SAR (Sodium Adsorption Ratio), pendant la saison estivale de l’année 2014. La présente étude a été effectuée dans trois palmeraies irriguées avec différentes qualités d’eaux à un facies sulfatée-magnésique dont, une palmeraie de Jedide avec une eau moyenne à médiocre (C3 -S1), tandis que les deux autres palmeraies de Cheaab El-aargoub et de Cheaab El-Nasser ont été irriguées par des eaux de qualité médiocre à mauvaises (C4-S1). Les résultats obtenus montrent que les sols des trois palmeraies sont qualifiés non salés à peu salés avec une conductivité électrique allant de 0,06 dS/m à 1,29 dS/m, le pH est alcalin à fortement alcalin variant de 7,64 à 9,2. Le taux de calcaire classe le sol au rang peu calcaire à modérément calcaire, avec aucun risque d’alcalinisation du point de vue SAR qui est estimé comme non sodique (0 à 0,19). L’analyse de la variance entre les trois palmeraies indique une déférence significative des paramètres CE, pH et CaCO3. Cette signification peut être liée à la qualité et la quantité des eaux d’irrigation utilisée ainsi qu'à la situation géographique et topographique de ces palmeraies. Or, La signification de la variance relative à l’irrigation (avant/après) est significative seulement sur la conductivité électrique.

Résumé: Algeria by its geographical position, geological configuration and the diversity of its climate presents an important richness of national and international wetlands. However, due to lack of information and sensitization, these wetlands are being degraded both by anthropogenic activities and by their underexploitation or overexploitation in the context of the valorization of their natural products. Thus, the Algerian Ministry of Environment has created the Environment Houses, whose main missions are education, information and sensitization on the protection and conservation of the environment in general. In this context, a survey was conducted in a few schools at all levels in four cities in northeastern of Algeria (Annaba, El Tarf, Skikda, Souk-Ahras) to assess the importance of environmental education and sensitization in the preservation of wetlands. The results showed that schools sensitized through environmental education campaigns led by Houses of Environment, have more knowledge about wetlands and their preservation, compared to those not sensitized. Indeed, this study has highlighted the primary role of environment houses in environmental education and sensitization of the need to protect and enhance these wetlands.

Résumé: The objective of this work is information providing about the vegetation and climate changes that occurred in the last millennium at the Wet Complex of El-Kala (Algeria). In order to contribute in the understanding of past dynamics and current wet area from this region, two case studies are described here: the alder-peatland of AinKhiar and Gbar El Halouf at El-Ghorra Mountain. Pollen data obtained from sediments of El-Kala allowed us to make inferences regarding the past vegetation and climate history. For this, two palynological cores from this area were analyzed. The results are supported by five AMS radiocarbon dates. The oldest data was recorded at El Ghorra Mountain (925±29 AD) while the recent data was recorded at the alder peatland of Ain Khiar (1809±97 AD). The obtained data highlight that starting with Medieval Warm Period (MWP) around 925±29 AD until 1581±52 AD, the landscape characterized by domination of thermophilous taxa related by warm temperatures average at both of studied sites, at the beginning of Little Ice Age (LIA) the landscape at both sites has the same appearance domination of hygrophilous taxa and decline of thermophilous taxa related by low temperatures average mentioned at that period and it was finished around (1809±97 AD). This study shows that from 19th century to present days the landscape is characterized by the expansion of thermophilous taxa at El Ghorra Mountain and traces of anthropogenic activities and at Alder of Ain Khiar retains its appearance despite the decline of all of local and regional vegetation.

Résumé: Signification paléoécologique et conservation des zones humides tourbeuses d’Algérie.— Les complexes humides de Numidie (Maghreb nord-oriental) abritent des milieux tourbeux dont l’histoire est très mal connue. Des études palynologiques ont été réalisées dans une aulnaie et une ériçaie tourbicole du complexe de Guerbès-Senhadja, dans le but de préciser leur origine, leur histoire et leur signification paléoécologique. Les séquences étudiées remontent à 8000 et 5300 ans, respectivement pour l’ériçaie et l’aulnaie. L’ériçaie à Erica scoparia, jamais décrite sur le plan phytosociologique, apparaît comme une formation ancienne et bien préservée, à très fort enjeu conservatoire. L’aulnaie a en revanche une origine récente (< 2000 ans), possiblement en lien avec une (ré-)immigration holocène de l’aulne depuis l’Europe méridionale. Les dégradations anthropiques très fortes subies par les milieux étudiés au cours des dernières années rendent urgentes l’implémentation de mesures conservatoires drastiques dans le but de préserver les derniers vestiges régionaux de ces milieux humides patrimoniaux.

Résumé: This study is part of the forest ecosystem research program initiated since 2005 by the laboratory Ecology of Terrestrial and Aquatics Systems Laboratory (Eco STAq). The objective of this study is to characterize the composition and organisation of the edaphic fauna (beetles) which is necessary for the proper functioning of these ecosystems. For that purpose, an entomological inventory has been performed under five forest groupings of El-Kala National Park (EKNP) in Northeast of Algeria. where one hundred and eight (108) species of insects have been captured, using two trapping methods; namely, Barber traps and cover plates. These taxa have been classified into 10 families (Brachyceridae, Carabidae, Curculionidae, Dynastinae, Geotrupidae, Pachypodidae, Scarabaeidae, Staphylinidae, Tenebrionidae, and Trogidae) and divided into four (04) groups, following their diet (coprophage, phytophage, predator and decomposer). The beetle population in the cork oak forest consists of 34 species, belonging to 09 families. The majority of insects are represented by the Carabidae (32.41%), followed by Scarabaeidae (19.44%); Tenebrionidae (15.74%); Geotropidae (10.19%), Curculionidae (5.56%), Trogidae and Dynastidae (4.63% each); Staphylinidae (3.70%); Pachypodidae (2.78%) and finally Brachyceridae (0.92%). The calculation of the specific diversity varies between 2.85 and 3.41 bits reflecting a significant structuring of the environment.

Résumé: In agriculture, soil total carbon (TC) and total nitrogen (TN) were the major determinants for soil fertility and indicators of soil quality, were closely related to soil productivity. Numerous field studies have shown that crop management practices can either enhance or diminish quantities of soil TC and soil TN. One hypothesized goal of sustainable agriculture is to increase soil OC and soil TN, or to maintain these quantities close to optimal levels. This study aims to evaluate total Carbon and total Nitrogen content in two Algeria regions under the effect of three tillage systems (plough tillage (PT), reduced tillage (RT), no tillage (NT)). The results showed significant correlations between the content of TC and TN in the two regions and all tillage systems. Comparable differences between tillage systems and regions for TC and the C/N ratio in the entire set of samples suggest that more input of new, litter-derived organic matter with large C/N ratios promotes larger TC concentrations in two the study site. The content of TC and TN where the correlation between TC and the C / N ratio in the whole set of samples is much greater.Increases in TC were positively correlated to increases in the C / N ratio. The declining C / N ratios in NT and RT in two regions are more important than they have been in the past.

Résumé: The study of pollen grain deposits in two transects of Fetzara lake (North/East of Algeria) was confronted with the floristic environment cover. This study required an inventory of vegetation (264 species) supported by archival documents (ancient botanical studies) and pollen analyzes (86 taxa). A total of 12 surface pollen samples was collected, then, chemically treated according to the standard method. Percentages of pollen were calculated in all samples. The results have showed that the current deposits palynomorphes in lake surface sediments reflect the regional vegetation of the watershed. The differential distribution indicates a dominance of nonarboreal pollen (52%) represented by the Asteraceae, Poaceae and Asphodelaceae on two transects. This reflects the current state of the vegetation cover, further, the presence of Alnus probably comes from the wet complex Guerbès Sanhadja, while that of Pinus, Quercus and Pistacia come from the bushes and the degraded subery of the Edough. The dominance of halophyte species such as Suaeda maritima L. and Salsola soda, as well as pollen from Chenopodiaceae, confirms the salinity of the environment. The richness of the site of aquatic and semiaquatic vegetation such as Typha domingensis (Pers.) Steudel, Juncus acutus L. and Myriophyllum verticillatum L. indicates the existence of water less than a wet period in the site. The study also showed the presence of a large amount of damaged pollen, probably related to poor conservation conditions and especially the moisture and desiccation phenomena that prevail on the surface of the soil.

Résumé: Characeae are macroscopic green algae present in the Maghreb (Morocco, Algeria, Tunisia) that are known since the 19th century works of Desfontaines (1800) and Braun (1868). Feldmann (1946) published the first regional synthesis, and this study provides a new Maghreb-wide synthesis of all collections made since 1784 (570 observations distributed over 464 sites). Each of the 31 reported species is described in detail with its diagnostic features, ecology and distribution in the three Maghrebian countries. Distribution maps distinguish between the three collection periods: 1780–1939, 1940–1979, and 1980–2016. An illustrated key is provided to help botanists working in the Maghreb to identify the taxa. From a biogeographical perspective, the Characean flora of the Maghreb is dominated by elements originating from northern (European) countries (61.3%) that include regionally very rare species such as Chara strigosa and C. tomentosa. The Mediterranean-Atlantic element is also well represented (32.3%), with some Mediterranean endemics (Chara imperfecta, C. oedophylla, C. vulgaris var. gymnophylla). Finally, two taxa that have an affinity for tropical conditions (Chara zeylanica and Lamprothamnium succinctum) extend to the southern Sahara. In North Africa, 14 species (7 Chara, 2 Lamprothamnium, 4 Nitella and 1 Sphaerochara) are threatened and raise issues about their conservation; three of these are particularly endangered: Chara imperfecta, C. oedophylla and Lamprothamnium papulosum.

Résumé: Abstract Populations located at the rear-edge of a species’ distribution may have disproportionate ecological and evolutionary importance for biodiversity conservation in a changing global environment. Yet genetic studies of such populations remain rare. This study investigates the evolutionary history of North-African low latitude marginal populations of Alnus glutinosa Gaertn., a European tree species that plays a significant ecological role as a keystone of riparian ecosystems. We genotyped 551 adults from 19 populations located across North Africa at 12 microsatellite loci and applied a coalescent-based simulation approach to reconstruct the demographic and evolutionary history of these populations. Surprisingly, Moroccan trees were tetraploids demonstrating a strong distinctiveness of these populations within a species otherwise known as diploid. Best-fitting models of demographic reconstruction revealed the relict nature of Moroccan populations that were found to have withstood past climate change events and to be much older than Algerian and Tunisian populations. This study highlights the complex demographic history that can be encountered in rear-edge distribution margins that here consist of both old stable climate relict and more recent populations, distinctively diverse genetically both quantitatively and qualitatively. We emphasize the high evolutionary and conservation value of marginal rear-edge populations of a keystone riparian species in the context of on-going climate change in the Mediterranean region.

Résumé: On sait depuis plusieurs décennies que de nombreuses zones humides, particulièrement les lacs et les tourbières, sont les meilleurs lieux de conservation des archives végétales et animales. C’est ainsi qu’il est possible de reconstituer les paysages végétaux des derniers millénaires et les variations du climat, particulièrement depuis la dernière glaciation. Mais les pollens et les macro restes ne sont pas les seuls témoins du climat passé. La mise en place des tourbières, les conditions de leur croissance, rendent compte du contexte climatique dans lequel ces processus se sont déroulés. Par ailleurs, les particularités pédologiques de ces milieux ont amené des climatologues à s’intéresser à ces espaces qui sortent des conditions normales de mesure des paramètres climatologiques. Les sols peuvent contribuer à la caractérisation des zones humides et de leur histoire dans la mesure où ils intègrent, sur un long terme, les conditions écologiques (géologie, climat, hydrologie). Il est ainsi possible d’évaluer à partir de l’observation du sol la durée d’engorgement en eau d’un espace. L’analyse des sols peut être utilisée pour identifier les zones humides potentielles. Ainsi, un espace sans végétation hygrophile ni inondation régulière, mais avec des sols hydromorphes, pourrait faire l’objet d’une restauration en milieu humide. Dans le but de retracer l’histoire du climat et la dynamique végétale sur une longue période, nous nous somme basé sur l’étude des microfossiles et des macro restes échantillonnés dans les sols organiques du complexe humide du Nord Est Algérien, grâce à un carottage effectué sur une profondeur qui peut atteindre plus de dix mètres. Cette étude qui retrace l’histoire de notre climat et de notre végétation dans cette région considérée comme un point chaud de la Biodiversité mondiale. Mots clés: sol, zone humide, dynamique végétale, changement climatique, pollen , macro restes et charbons fossiles

Résumé: L'estimation du carbone organique du sol (SOC) est nécessaire dans les sciences du sol et le changement climatique. La méthode de mesure de la matière organique du sol par perte au feu (LOI) de la matière organique est considérée comme une méthode facile et rapide, mais elle présente certaines limites liées à la température atteinte et à la présence de carbonates. Au contraire, la méthode de Walkley-Black (WB) est largement utilisée et elle est considérée comme une méthode relativement précise mais les substances carbonées récalcitrantes peuvent résister à l'attaque oxydative. Notre étude vise à évaluer les relations statistiques entre ces deux méthodes afin d'estimer la matière organique récalcitrante qui reste dans le sol. Dans ce but, 59 échantillons ont été collectés à une profondeur de (0-20cm) dans des sols soumis à différentes pratiques de gestion des sols dans le sud de l'Espagne. Les résultats de LOI et WB ont été comparés par des équations de régression linéaire simple. Le LOI nous a donné des estimations plus élevées du SOC, tandis que la méthode WB avait des estimations plus faibles pour tous les échantillons. Il y avait une bonne relation entre ces deux méthodes dans les sols urbains (R2=0.82, p < 0.001), cette relation était modérée dans les sols peu ou pas perturbés (sols pastoraux, sols de cultures arboricoles) (R2=0.41, p < 0.05), cependant il n'y avait aucune relation dans les sols récemment perturbés (sols récemment restaurés, cultures intensives) (R2=0.09, p > 0.05). Les différences entre la teneur en matière organique du sol déterminée à l'aide du LOI et du WB, ont révélé que les sols non travaillés ou non perturbés favorisaient la stabilisation et le stockage du carbone organique, tandis que dans les sols travaillés, dans le sol supérieur, la stabilisation du carbone organique du sol peut être plus difficile. Mots clés : Carbone organique du sol, Séquestration du carbone, Matière organique, Perte au feu, Walkley-Black.

Résumé: Le présent travail est une contribution à l'étude des invertébrés du sol dans un habitat forestier ( cas de la subéraie de la péninsule de l'Edough (Nord-Est Algérien). Les Travaux d'inventaire de la pédofaune en milieu forestier en Afrique du nord, sont rares ou peu documenté jusqu'à présent. L'établissement des inventaires pédobiologiques permet d'une part de déterminer le niveau de fertilité biologique du sol et d'autre part de comprendre la morphologie et le fonctionnement qui en découlent. La distribution verticale et l'abondance de la pédofaune ont été analysé dans la litière et les trois horizons sous-jacents par deux méthodes d'extraction: Berlese-Tulgren et l'extraction par le formol aldéhyde. suivie par une caractérisation morpho-analytique du substrat. Les résultats obtenus ont permet de reconnaitre 11 ordres taxonomiques de la pédofaune. La comparaison entre les prélèvements en se basant sur l'indice de Shannon et l'indice d'équitabilité montre que le milieu est équilibré et diversifié malgré une forte présence du Nématode. Il ressort que l'état de la faune est fortement lié aux conditions du milieu (Sol et formation forestière) La densité de la faune du sol est plus importante dans l'horizon de surface (0-15). Les résultats obtenus constituent une première ébauche, il serait plus judicieux, en perspective, de conjuguer l’effort de l’inventaire de la pédofaune avec celui de faune forestière en utilisant les méthodes et techniques appropriés aux espèces notamment la méthode d' ADN. Mots clés : pédofaune, chêne liège, Sol, Edough Annaba .

Résumé: Le massif de L’Edough, situe´ a l’Ouest d’Annaba (Nord-est alg ` erien) est caract ´ eris ´ e par une ambiance biocli- ´ matique humide et une biodiversite unique. Elle r ´ eunit dans un espace r ´ eduit 9 biotopes: Z ´ enaie, Sub ´ eraie, ´ Pinede, Eucalyptaie, Ripisylve, une zone rocailleuse littorale, maquis, pelouse et des Lacs. ` Durant une annee, nous avons analys ´ e chaque mois la pluie pollinique en utilisant des pi ´ eges ` a pollen. ` L’identification microscopique des pollens montre la presence de 82 esp ´ eces appartenant ` a 43 familles. Nous ` avons compte 36 esp ´ eces arboris ` ees et 45 esp ´ eces non arboris ` ees. ´ Nous avons remarque que 62 % d’esp ´ eces de pollen sont, seulement, repr ` esent ´ ees dans le couvert v ´ eg´ etal du ´ site et 38 % ne le sont pas. Ces especes proviennent soit par le vent, soit il s’agit d’esp ` eces disparues du ` couvert veg´ etal. ´ Ce travail est en cours pour l’elargir ´ a la r ` egion Nord-est Alg ´ erienne

Résumé: Dans le cadre de la contribution a l’ ` etude de la relation v ´ eg´ etation r ´ egionale et pluies polliniques dans ´ l’extreme nord est alg ˆ erien, nous avons r ´ ealis ´ e une analyse pollinique sur des coussinets de mousses provenant ´ de plusieurs sites qui se dispersent le long d’un transect bioclimatique Nord/Sud. l’echantillonnage a ´ et´ e r ´ ealiser dans des formations foresti ´ eres en partant l’ ` etage bioclimatique humide puis ´ le sub humide, le semi aride superieur et en fin le semi aride inf ´ erieur selon la pr ´ esence des coussinets de ´ mousses. le prel´ evement des coussinets de mousses est manuelle quant ` a la purification des pollens nous avons utilis ` e´ le protocole standard. La lecture et l’identification ont et´ e r ´ ealiser sous microscope grossissement X40 et en ´ comparaison avec les atlas pollinique de M. Reille (1992, 1996, 1998) les resultats obtenus de l’identification du pollen ont permit de dresser un diagramme pollinique. L’observation ´ de ce diagramme montre une nette zonation de veg´ etation qui met en relation les s ´ eries de v ´ eg´ etations, la po- ´ sition de la station et l’etage bioclimatique. ´ Ces resultas ont montr ´ e une relation non claire, car nous avons constat ´ e l’existence des esp ´ eces pr ` esents dans ´ l’inventaire pollinique et son absente dans l’inventaire floristique est le contraire. Ces contradictions sont dues aux caracteristiques morphologiques du pollen, la dur ´ ee du cycle v ´ eg´ etatif ainsi que l’aptitude de l’esp ´ ece ` a` produire le pollen. Il serait donc souhaitable de multiplier les prel´ evements de coussinets de mousses dans la m ` eme s ˆ erie de ´ veg´ etation. ´ Mots cles: pluie pollinique, transect, ´ etage bioclimatique, inventaire de la v ´ eg´ etation, Nord est Alg ´ erien