فهرست مطالب

  • Volume:18 Issue: 1, 2020
  • تاریخ انتشار: 1399/01/20
  • تعداد عناوین: 8
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  • A. Amazzal*, E. Ait Talborjt, J. Hermas, N. Hafidi Pages 1-12

    The present study aimed to evaluate the spring biodiversity of planktonic eggs and larvae in Imessouane Bay and to assess their variability according to the hydrological parameters of the environment. Twenty seven biological and hydrological samples were taken at three stations during a three-month period (March, April and May 2018). The qualitative study revealed the presence of 26 taxa, divided into six major groups, of those the Arthropod larvae were the most dominant (43.16%). The maximum abundances of planktonic eggs and larvae were recorded during May, as the richest month in terms of diversity (25 taxa). The principal component analysis of the hydrological parameters made it possible to define a temporal organization dominated by 3 groups. The canonical correspondence analysis exhibited that certain environmental parameters are essential factors for the functioning and the spatiotemporal variability of the planktonic communities.

    Keywords: biodiversity, eggs, larvae planktonic, Imessouane Bay, Arthropod larvae, hydrological parameters
  • Z. Mdehheb*, B. Elkihel, M. Bouamama, B. Hammouti, F. Delaunois Pages 13-20

    Nowadays, the environment occupies more and more a priority thought for the public opinion as well as for the local authorities, the administrations and the companies. Environmental management improves the performance of any organization towards the environment. In this perspective, our work consists in developing a dashboard grouping all the environmental indicators and which can have a direct or indirect impact on the economic performance of the company starting from the implementation of an environmental management system based on the ISO 14001 standard. This table can serve as an environmental decision support tool while also analyzing the results of monitoring. This approach, key for sustainable development, is encouraged by public authorities and Moroccan economic actors.

    Keywords: Company, Environmental Management System, ISO 14001 Standard, environmental scoreboard, Economic Performance
  • A. Azizi, A. Krika, F. Krika* Pages 21-29

    In this study we determined the concentration of metals (Cd, Ni, Zn and Cu) in sediment and aquatic plants (Typha latifolia and Arundo donax). The level of pollution in the sediment was assessed using contamination factor (CF), pollution load index (PLI) and geo-accumulation index (Igeo). Obtained results have exhibited that the distribution of trace elements in sediment follows: Zn (196.51 µg g-1) > Ni (140.68 µg g-1) > Cu (121.56 µg g-1) > Cd (1.101 µg g-1). However, comparison of sediment metal concentrations with several environmental contamination parameters, such as: probable effect level (PEC) and background levels, indicated that the concentrations of all investigated elements were less than PEC, except that of Ni, albeit higher than the background levels. The Igeo values revealed that Cd (1.28 µg g-1) had been accumulated significantly in the Djendjen River. Contamination factor (CF) exhibited that the sedimentary samples were moderate in terms of all studied metal contaminations. The pollution load index (PLI) values were above one (>1), displaying an advanced decline of the sediment quality. In studied plants, results exhibited that the amount of concentrations in tissues is significantly dependent on the kind of organ and element. A. donax revealed a lesser capacity of bioaccumulation as well as a lesser efficiency of metal removal than T. latifolia. In contaminated aquatic ecosystems, the presence of T. latifolia may increase the removal of heavy metals, thus, their introduction contributed to a possible action of phytoremediation.

    Keywords: Trace elements, Macrophytes, Phytoremediation, Djendjen River, Algeria
  • M. Khatun*, A.K.M. Rashidul Alam Pages 31-45

    The study was performed to evaluate phytoplankton assemblage, physical and chemical characteristics of water, interrelationship between phytoplankton assemblage and physical/chemical characteristics of water and to evaluate water quality index during November, 2015 - September, 2016 for Turag River that is located on the north-eastern side of Dhaka city, Bangladesh. Water samples were collected during winter (November - January/2015-2016), summer (March-May/2016) and rainy season (July ̶ September/2016). During the study, the overall phytoplankton assemblage exhibited the following pattern: Bascillariophyceae (40.33%) > Chlorophyceae (32.90%) > Euglenophyceae (14.56%) > Cyanophyceae (12.20%). Fragillaria crotonensis, Navicula grimmei, Phacus circulatus, Euglena agilis, Chlorococcus minutum and Trachelomonas goossensii were dominant phytoplankton species. The average values of water temperature, total dissolved solids (TDS), electric conductivity (EC), pH, dissolved oxygen (DO), biological oxygen demand (BOD5), total nitrogen (TN) and dissolved phosphorus (DP) were 25.94°C, 273.46 mg L-1, 489.71µS cm-1, 6.81, 2.89 mg L-1, 3.85 mg L-1, 8.55 mg L-1 and 0.62 mg L-1, respectively. Euglenophyceae displayed significant negative correlation with DO in winter while TDS in rainy season. Chlorophyceae exhibited significant negative correlation with DP in rainy season. Shannon-Weaver’s (H') and Simpson’s (D) diversity indices ranged between 2.58-3.01 and 0.91-0.95, respectively. In summer, the value of H' (3.01) indicated slight pollution. In winter and rainy seasons, the values of H' were 2.58 and 2.98, respectively displaying light pollution in Turag river. Measured water quality index (WQI) values were 229.71, 171.23 and 74.18 in winter, summer and rainy season, respectively exhibiting that water was unsuitable for drinking purposes in winter and summer and also very poor water quality in rainy season, respectively. The implication of these findings can be used to monitor health of riverine ecosystems which provide ecosystem services for society.

    Keywords: Diversity Index, phytoplankton, Pollution, Turag River, Water Quality Index (WQI)
  • H.R. Zolfagharpour, P. Nowrouz*, A. Mohseni‐Bandpei, M. Majlesi, M. Rafiee, F. Khalili Pages 47-57

    Mismanagement of Medical wastes can lead to human health and environmental risks. Currently, new pyrolysis technologies are being used to treat medical waste that can reduce the amount of landfilled waste, make it safe, and eventually convert it to a hydrocarbon fuel. Polycyclic aromatic hydrocarbons (PAHs) are pyrolysis by-products and major environmental pollutants. In this study, hazardous medical wastes were pyrolyzed using a semi-industrial pilot scale fast pyrolysis reactor with the purpose of improving the quality of the char for its recovery or use as fuel. The generation of total 4-6 rings PAHs was studied in char product from hazardous medical waste fast pyrolysis under different pyrolysis conditions variables including a vast temperature range (300-700°C), different residence times (100-190 s) and various waste particle sizes (1-3 cm). GC analyzer coupled with a FID detector was used to detect and measure the PAH compounds in char residues. The results demonstrated that the PAHs are present in significant concentrations in char product (54-1184 mg kg-1). Generation of total 4-6 rings PAHs varied by temperature, residence time and waste size. Significant interaction was observed between residence time and temperature that influenced the PAHs generation. By optimizing the pyrolysis operating conditions it is possible to minimize the amount of PAHs generation in the char.

    Keywords: Fast pyrolysis, Polycyclic aromatic hydrocarbons (PAHs), Char, Medical waste
  • A. Zahmatkesh*, K. Karimzadeh, M. Faridnia Pages 59-71

    The present study was conducted to investigate the protective effects of selenium nanoparticles (nano-Se) and chitosan oligosaccharide (COS) against the malathion-induced blood hematological and biochemical alterations in Caspian roach (Rutilus caspicus). The fish treated with 0.5 mg L-1 malathion in water and supplemented with selenium nanoparticles (1 mg kg-1) and /or COS (600 mg kg-1) in their diet for 28 days. At the end of the experiment, the blood samples were collected and hematological indices were assayed including serum total protein, albumin, globulin, glucose, cholesterol and triglyceride as well as enzymes such as aspartate aminotransferase (AST), alanine aminotransferase (ALT), lactate dehydrogenase (LDH), alkaline phosphatase (ALP) and acetyl cholinesterase (AChE). Significant decreases were observed in LDH level, AChE activities and hematological indices such as the white and red blood cell count, hemoglobin and hematocrit levels of the fish exposed to malathion (p < 0.05). Dietary selenium nanoparticles and COS could significantly (P < 0.05) reduce hematological indices, lysozyme value and the blood antioxidant enzyme activities in malathion-exposed Caspian roach. Briefly, this suggests that supplementation of dietary Caspian roach with nano-selenium (1mg kg-1) and /or COS (600 mg kg-1) may have positive effects on hematological and biochemical indices in fish exposed to malathion stress.

    Keywords: Biochemical markers, Nano Selenium, Pesticides, Caspian roach, Stress enzymes
  • M. Mohammadi Galangash*, P. Nikkhah, M. Nikooy Pages 73-80

    This study was carried out in the Saravan Forest Park in north of Iran. The sound level measurements were performed at 12 stations and at distances of 3, 100, 200, 400 and 1000 m from the sound source with three replicates, in the summer and in traffic hours from 10 AM to 2 PM an area without tree cover was selected as the control station. The results indicated that sound intensity at first distance (3 m) with the mean of 77.81 decibel (dB) exceeds the national standard of Iran. In this study, the first significant decrease in the sound intensity was obtained at a distance of 100 m, with the highest reduction of 26 dB for station 10, while the lowest decrease was found at station 11 with 8 dB. In an overall summary, distances less than 200 m are not suitable for tourism accommodation. The average sound intensity at distances in comparison with the permissible value indicate that the park does not currently have any noise pollution at more than 200 m in summer.

    Keywords: Noise Pollution, plant cover, Distance effects, Seasonal variation
  • M.H. Karim*, A. Sardar Shahraki, S. Kiani Ghalesard, F. Fahimi Pages 81-91

    Nowadays, climate change is one of the global issues. Given the occurrence of climate change in different parts of the world in recent years, a major concern of environmental and forestry activists and policy makers has been to explore the direct and indirect deteriorative impacts of this phenomenon on different facets of forest ecosystem and local communities. The present study run an opinion poll among 315 activists, students, teachers, and experts of environment in Iran during 2019 to find out the extent to which they believed that severe climate change was happening in different forests and how they assessed the performance of environmental resources and forest management practices. The analysis of data exhibited that over 90% of the participants acknowledged the occurrence of severe climatic changes in recent years and almost none of them assessed the present forest management style to be appropriate. On the other hand, the participants suggested that the Zagros and northern forests of Iran have most severely been affected due to climate change by about 53% and 31.7%, respectively. Thus, to reduce destructive impacts of climate and global warming on human and local community, it is recommended to prioritize climate change adaptive management strategies in these regions.

    Keywords: Adaptive capacity, Climate Change, Forest management, Iran