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Showing 4 results for Bahman
Arash Yousefi, Hooman Bahmanpour, Behrang Salajegheh, Soolmaz Dashti,
Volume 5, Issue 2 (9-2013)
Abstract
Sensitive marine areas have attracted particular attention in biological management aspects because of having special ecological, economic, social and environmental traits. The present research tries to investigate the role of birds for identification of marine biological sensitive areas, as a case study the National Park in Boujagh wetland has been chosen. The method used in this study is an analytical- functional one which is done through selecting the one main criterion and five inferior criteria and after selecting all criteria by means of scoring method (ranking) all criteria would have quantitative value. Based on the above discussed methodology, the area was divided into 33500-ha parcels (Evaluation Unit of 2.2×2.2 kilometers grids). After field observation and interpretation of aerial photos and satellite images the characteristics of each parcel in the form of selected criteria have been analyzedand therefore the information layers were produced in GIS software. The results showed that the bird population in 57.58% of study units is less than 1000 birds and also 33.33% of studied units were in lack of biodiversity and 39.39% of the study units have three threatened species. Total identified birds in study area was 153 species, in which amongst them 21% of species are as Protected Species in National Environmental laws and at least two species belonged to the IUCN Red List.
Omid Tabiee, Najmehi Ebrahim, Naseri Bahman,
Volume 6, Issue 1 (5-2014)
Abstract
Bamdezh wetland with an area of 4000 hectares is located in48°35´ 34˝ E and 31°44´ 40˝ N northwest of Ahwaz city, Khouzestan provinceandsouthwest of Iran.This paper presents species diversity of wintering waterfowl and wader's fauna population in Bamdezh wetland for an eleven-year (2001-2011)monitoring duration. In order to study the overwintering diversity of birds, data from the censuses mid-winter bird counted according to the method of total count of Khuzestan department of environmental protection have been collected and analyzed. Data analysing for determine species diversity carried out by using Ecological Methodology and SPSS software.During an 11-yearperiod from 2001 to 2011, 345930 wetland birds composed of 69 species from 6 orders and 14 families of the bird’s fauna of Iran were observedduring this study. The most common species was the Eurasian Teal (Anascrecca) with a total number of 161252. The results indicated thatamong families of wintering waterfowl and waders, the largestfamily wasAnatidaewith 90.57percent abundance and the lowest was Sternidaewith 0.01 percent. In the period of study, year of 2007 with 150937 individuals has the highest population numbers and year of 2010 with 676 individuals has the lowest. The highest species richness recorded in years of 2007 with 46 species in this year. The results showed that in this periodwaterfowlfauna with 90.85 percent and wader's fauna with 9.15 percent respectively has the highest and lowest abundances. According to the results ofspecies diversity, the year of 2010 has the highest biodiversity of wintering waterfowl and wader's fauna in Bamdezhwetland and year of 2007 has the lowest biodiversity (P< 0.05).
Mahmood Bahmani, Seyed Mehdi Hosseinfard, Maryam Ehdaee,
Volume 6, Issue 3 (Autumn 2014)
Abstract
Aeromonashydrophila bacteria commonly founded in fresh water throughout the world, which often results diseases in the farmed fish’. Over the past years to combat infectious diseases are extensive used NtyByvtykHa been. In contrast to the prevailing global trends and develop green BzyPrvry systems use organic herbs as antibiotic treatment is considered. The marjoram plants used in traditional medicine to treat many diseases would-be applicable. The effect of aqueous and alcoholic SarhHay herb marjoram on survival and some blood factors common carp that contaminated with the bacterium Aeromonashydrophila were examined.For this purpose, water and alcoholic SarhHay marjoram plant was prepared and then a number of 150common carp, with an average weight of 25± 100gr were prepared. After adaptation MahyHa repeated in 3to 5groups (n = 10fish per replicate) were divided. The positive control group intraperitoneally injected with saline in the area and the fish did not receive any SarhAy. A. Negative control in bacteria injected into the 106 × 5/1 in the samples was performed by intraperitoneal carp were fed with normal diet. 35 days after the end of the experiment, blood samples were taken and TstHay measure blood factors done. The survival rate during this period was calculated. The results showed that the changes in the hematological SarhHay marjoram plant species infected with the bacteria that the effects of alcohol, particularly methanol SarhHay with more intensity than the aqueous extract was observed.
Bahman Feyzi, Nasrollah Ahmadifard, Mahdi Erfanian,
Volume 13, Issue 3 (Autumn 2021)
Abstract
Lakes in the world have a very important ecological role in ecosystem balance. One of the methods of reviewing changes over time is the use of multi-time satellite imagery, which is useful way in terms of economic. Considering the importance of Zarivar lake as the largest freshwater lake in the west of the country, temporal and spatial changes of vegetation and its water level were studied using the satellite imagery of TM (Thematic Mapper) and OLI (Operational Land Imager) Landsat from 1984 to 2012 and 2013 to 2016, respectively. Dense and light vegetation changes using NDVI (Normalized Difference Vegetation Index) index and water level changes using NDWI (Normalized Difference Water Index) index were assessed. Using these indicators, it was determined that the water level of the lake decreased during the study period 8168 km2, and the size of dense and light vegetation was from 2,401 and 0.961 km2 in 1984 to 13.576 and 3.122 km2 in 2016. With a field visit to the lake, the changes in this vegetation were confirmed. By examining the parameters of annual precipitation, evaporation and annual mean temperature at the synoptic station of Marivan (1 km from the lake), it was found that the decrease of lake water surface and the increase of dense and light vegetation levels is due to human intervention through the entry of agricultural, urban and industrial effluents into Zarivar Lake. This action could be considered by field visits and observing the entry of effluents from residential areas into the lake. On the other hand, by examining the amount of rainfall in the province, it is clear that the rainfall factor has a lesser role in reducing the lake water level.
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