R. Aghaei, S. Alvaninejad, R. Basiri , R. Zolfaghari,
Volume 1, Issue 2 (3-2013)
Abstract
In applied studies, identification and study of vegetation, for management and protection of natural ecosystems, are very important. This study was carried out in Vezg forest with an area of 308 hectares located in southeast of Yasouj city. The purpose of this study was to classify ecological species groups and survey their relation to soil physic-chemical properties and physiographic attributes. For this purpose, the field data were obtained using 52 sample plots (15m×30m) in a systematic random grid. In each sample plot, the cover percentage of tree, shrub and grass species type were recorded, by using Braun-Blanquet method. The TWINSPAN method and Canonical Correspondence Analysis (CCA) were used for the definition of ecological species groups and determintion of the relationship between ecological species groups and environmental properties. Results showed that, there were four ecological species groups in the study area. The First group included: Anchusa italic-Quercus brantii, the second group: Heteranthelium piliferum-Avena clauda, the third group: Teucrium polium and the fourth group: Salvia reautreana. The first group was in an area, where there was a higher percentage of Persian oak litter. The second group was located in site a with higher grass cover than the site of other groups in the area. The third and fourth groups, were located in the higher elevation and steep points. Results of CCA showed that soil properties were not in significant relation with ecological species groups. But, the relationships of ecological species groups with other environmental factors such as litter, altitude, grass cover and slope were significant. So, we can conclude that these properties are effective in the separation and distribution of ecological groups.
F. Hajiaghaei Ghaazi Mahalleh, J. Imanpour Namin, M. Sattari,
Volume 9, Issue 3 (11-2020)
Abstract
Benthic macroinvertebrate-based indices are suitable tools for assessment of stream health and human impacts on its biological integrity. Since Ghale Rudkhan River is an attractive tourist destination and its surrounding population is growing, its water quality was examined usning biological indicators. Macroinvertebrate samples were taken monthly by a Surber sampler (mesh = 300 µ and area = 900 cm
2) at five stations from May to December 2017. Samples were preserved in ethanol 96% and transported to laboratory for analysis. Total abundance, EPT index, EPT richness and percentage,EPT/CHIR ratios were determined. In total 5134 macroinvertebrates that belong to 35 genera, 30 families, 10 orders, 4 classes and 3 phyla were identified. The highest EPT richness was observed at the station no. 4 in May (607 ind.m-1) and the lowest was at the station no. 5 in October (7 ind.m-1). The presence of pollution sensitive species such as
Epeorus sp.
Rithrogena sp.,
Rhyacophila sp.,
Isopela sp.,
Gomphus sp.,
Cordulegaster sp.,
Coenagrion sp.,
Oligoneuriella sp.,
Heptagenia sp.,
Philorus sp. in Ghale Rudkhan River indicated the optimal quality of the river water.
F. Haji Aghaei Ghaazi Mahalleh, J. Imanpour Namin,
Volume 13, Issue 2 (2-2025)
Abstract
Abstract
This research was conducted to investigate the statistical correlation between microplastic contamination and potentially toxic elements in Kutum populations (Rutilus kutum) at three sampling stations: Kiashar, Anzali and Astara, located along the Southwestern coast of the Caspian Sea. The results from analysis of 60 fish samples indicated that all samples were contaminated with microplastics. The highest mean abundance of microplastic, 53.75±35.50 (particles per fish), was observed at Anzali sampling station. The results of the elemental concentration analysis showed that Iron had the highest concentration, with a mean value of 23111 ± 5945.33 µg/kg at Anzali station. At Kiashar station, a significant negative correlation was observed between the abundance of microplastics and the concentrations of Cadmium and Nickel (rs˃-0.4, p˂0.05). At Astara station, a significant positive correlation was found between the abundance of microplastics and the concentrations of Arsenic and Nickel (rs˃0.4, p˂0.05). According to the comparison of elemental concentrations with FAO/WHO standards, only the concentration of Arsenic in fish from various stations exceeded the permissible limit. These findings indicate the complex interactions between microplastic contamination and elemental concentrations in Kutum (R. kutum) from the Caspian Sea, necessitating further research to evaluate the environmental impacts and the health of the Caspian Sea ecosystem.
