HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
Les Odonates de l’hydrosystème du Mazafran : distribution et structure de communauté. L’un des objectifs de notre étude est d’acquérir une meilleure connaissance sur les Odonates du réseau hydrographique du Mazafran, situé au centre-nord de l’Algérie. Cette région, jusqu’à présent inexplorée du point de vue odonatologique, se caractérise par un climat méditerranéen subhumide avec une période sèche qui s’étale sur six mois environ, de mai à la fin d’octobre. La prospection de 19 stations réparties dans le réseau hydrographique du Mazafran, sur une durée de 24 mois consécutifs (d’avril 2013 à mars 2015) nous a permis de recenser 948 Odonates adultes appartenant à 15 espèces. Calopteryx haemorrhoidalis (33,1 %) et Platycnemis subdilatata (20,5 %) sont les plus abondantes et les plus fréquentes d’entre elles. Les résultats révèlent la présence d’Ischnura pumilio, qui, actuellement, n’est plus connu en Algérie que de la Numidie (nord-est du pays) et est rare au Maghreb. Les caractéristiques physicochimiques et climatiques des oueds qui composent le réseau hydrographique du Mazafran, ainsi que l’irrégularité des écoulements qui conduisent, notamment, à l’augmentation de la température des eaux en été, ont un impact considérable sur les stations localisées en basse altitude. Combiné aux rejets d’eaux usées urbaines, aux effluents industriels, à la destruction des lits, aux pompages anarchiques de l’eau à des fins agricoles et à la réduction du couvert végétal dont les Odonates sont fortement dépendants, la destruction des habitats, par l’altération de ses composantes (biotiques et abiotiques) s’avère certaine.
This study was conducted with a sample of 733 Cyprinus carpio collected between May 2013 and February 2016 from the ecosystem lake in the Ghrib dam which is eutrophic. Cyprinus carpio in this dam is characterized by a single fractional spawning that begins in the spring and ends in the late summer. The distributions of the viscerosomatic and gonadosomatic indices decrease between the spring and summer seasons. These periods correspond to the spawning period and the biological break of this species. They progressively increase between autumn and winter when the biological activity of the species returns. The hepatosomatic index progressively decreases between the spring and the summer when the hepatic reserves are used for reproduction. The repletion index shows that the trophic activity of C. carpio is intense in the spring. The condition factor varies between 1.1 and 1.35. The evolution of the biological indices of both sexes is well stressed in well‐defined periods according to the seasons. The values are weak for males and high for females. The redundancy analysis allows the characterization of the influence of the physico‐chemical parameters of the dam water, especially the role of the nutritious elements, in the biological seasonal cycle of C. carpio.
We investigated the association between air pollution and asthma and bronchitis hospital admissions in Algiers city (Algeria). In addition, we used geographic information systems (GIS) and statistical methods to evaluate their correlation with the atmospheric pollution estimated by the lichen biomonitoring method of the index of atmospheric purity (IAP), the index of human impact (IHI) and environmental parameters. Thus, we georeferenced 976 local patients (including 771 patients with asthma and 205 patients with bronchitis). Then, we compared the patients to the spatial distribution of IAP in thirty-five areas (communities). The results revealed a significant difference in the mean spatial variation in the diseases among those areas. In fact, maps and generalized linear models (GLMs) revealed a significant negative correlation between IAP and diseases. Therefore, redundancy analysis (RDA) and Monte Carlo tests described a significant effect of IAP, urbanization and the number of roads on the distribution of diseases. We hope our findings contribute to enriching the literature on health research with a low-cost method of monitoring outdoor air pollution.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.