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Based on the macro-invertebrate community and physico-chemical indices, water quality of the Tajan River in 6 stations along 80 km of the river length was assessed. Monthly sampling was conducted for one year (September 2011 to August 2012), using a surber with 30.5 × 30.5 cm dimensions and a 60μ mesh net for the benthic invertebrates sampling. The identified macro-invertebrates belonged to 31 families, 12 orders and 5 classes, the highest and the lowest abundance of which belonged to Psychodidae and Chironomidae, respectively. Based on Hilsenhoff Family Biotic Index, the research stations were classified into 4 qualitative categories, viz. excellent, good, fair, and fairly poor. Stations 1 and 5, respectively, showed the highest and lowest HFBI index. The highest and the lowest values for the Shannon–Weiner index were recorded in station 1 and station 2, respectively. The results of physicochemical parameters indicated  reduced dissolved oxygen in the stations 2 and 5, and increased TDS in station 2 and 1 and increased nitrite and ammonium in station 3. Results of Spearman correlation coefficients between biotic indices and physicochemical variables revealed significant relationship between DO, TDS, EC, PO₄ and water flow with HFBI and Shannon-Weiner indices. This study showed, generally pollution in stations 2 and 5 has reduced water quality in these station's.

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This research was conducted with the aim of determining the biodiversity of Pertaran communities in three areas with mangrove cover and in 9 stations including one station in Gowatr Bay and 4 stations in each of Gowatr bay and Bahu Kalat on the eastern coast of Chabahar port. From each station, from the winter of 2019 to the fall of 2014, three sediment samples were collected seasonally for the separation and identification of sediments and one sample for the analysis of grain size and total organic matter of the sediments by Grab van Veen with a cross-sectional area of 0.028 square meters. In total, 12 genera belonging to 10 families were identified. Among the groups of the detected families of spionidae, the highest percentage of the average frequency with 13.70% was related to the Spionidae family. The survey of the density of the birds in total is 17800 ± 180 in the mentioned seasons, the average density of the birds in winter is 8720 ± 42 and the average density of the birds in the autumn is 9080 ± 181.63 in the mentioned seasons, the lowest average in winter is related to the Nereidae family: 0.5 600±67 and the most number was for Spionidae family: 1280±31.47 individuals in one square meter. The lowest average in autumn was related to the Nereidae family: 560 ± 32.65 and the highest to the Spionidae family: 1160 ± 62.94 individuals per square meter.

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Based on the obvious relationship between geoforms and soils, pedodiversity was investigated in this study through the Spatial Distribution Patterns (SDPs) of LandForms (LFs) using quantitative analysis of the irregular geometry of LFs in Zayandeh-Rud Valley. The main objectives of this research were to: (1) Assess the applicability of fractal and modified fractal dimensions in quantifying the irregular geometry of LFs in the study area and (2) Specify the relationship between the irregular geometry of LFs and the pedodiversity in the region. LF units were delineated using aerial photographs at a scale of 1:55,000; and the geoform classification system was defined according to Zinck. After fieldwork and soil sampling, Soil Taxonomy was used for soil classification at the family level and determination of the geomorphic map units. The fractal Dimension (D) and modified fractal Dimension (D_m), as geometric indicators, and richness (S), Shannon diversity index (H′), maximum diversity (H′_max), and Evenness (E), as pedodiversity measures, were determined for LFs. Results showed that D and D_m were appropriate indicators of geometric irregularity, with their high values corresponding to fluvial surfaces with intensive dissection and deposition processes, and their low values corresponding to the smoother and more stable landforms. Comparison of the pedodiversity indices with the geometric measures in the landscapes showed that D_m was a suitable alternative to D in presenting structure of landscapes with high D and D_m values relatively coinciding with high amounts of richness in the study area. In addition, D_m was more closely related to the diversity indices than D was to the discernment of the pedodiversity of LFs.