نتایج جستجو برای: margalef d
تعداد نتایج: 577766 فیلتر نتایج به سال:
In the present study, some ecological factors were studied for Amphipoda at different depths. The Shannon, Margalef, and Hill indices were used to determine the species diversity, richness and evenness, respectively. In addition, the association and niche overlap values were estimated. Indices of species richness and diversity were highest at 50 and 100m depths, respectively. The ordination o...
The study of spatial and temporal variability of distribution of phytoplankton communities in Northern part of the Persian Gulf (Qeshm andLengeh Islands) was studied. In this study, five groups (47 genera) of phytoplankton include Bacillariophyceae, Dinophyceae, Cyanophyceae, Crysophyceae and Euglenophyceae were identified. The results showed that Diatoms group (79.6 %) and Rhizosolenia genus (...
In order to investigate the sedimentary texture, diversity and density of benthic molluscs, 55 stations at 9 transect were collected in the Nayband Bay.Samples were taken with a Van Veen grab (0.022 m2) in 3 replications in each site.Using a Particle Size Analyzer instrument revealed that the sediment texture was dominated by sand with 7 sub distinct sub sediment. Semelidae,Veneridae and Tellin...
In order to evaluate the macrozoobenthic fauna of Çıldır, Aktaş and Aygır lakes, 47 taxa were identified as a result samplings carried out in different periods 2013, 2017 2019. 41 43 at species level new records for study area. The dominant Lake Çıldır Gyraulus (Armiger) crista (4.49%), Paratanytarsus lauterborni (3.90%) Virgotanytarsus arduensis (3.80%). It was seen that gammarid population de...
The understorey is one type of tropical forest vegetation that contributes to the complexity structure. habitat closely related condition vegetation. This study aims determine structure and composition support ecological function in Malagembol Block, Mount Tilu Nature Reserve. sample collection was carried out using plot method. A total three main plots measuring 10×100 m2 were divided into ten...
In the present study, some ecological factors were studied for Amphipoda at different depths. The Shannon, Margalef, and Hill indices were used to determine the species diversity, richness and evenness, respectively. In addition, the association and niche overlap values were estimated. Indices of species richness and diversity were highest at 50 and 100m depths, respectively. The or...
Recognizing the herbaceous plant species diversity could use as an importantindicator applied for the rangeland and forests management. Considering the presence ofvegetation and animal husbandry in Zagros region, Iran, being aware of the diversity andrichness of plant species is necessary to management or the destructed vegetationrestoration. In order to study the effect of aspect and elevation...
survey on zooplankton composition was studied during june 2015 to march 2016, by selecting six stations along the coastal waters of bushehr (the northwest persian gulf). twenty four zooplankton taxa were identified, and the different zooplankton groups represented twenty-one families. copepoda was recorded with the most abundance (53.30 %) followed by malacostraca (32.87 %), which in turn was f...
In the past 30 years, Northwest China has experienced a warm and humid climate increase trend. How this change will affect species diversity of plant communities is hot issue in ecological research. study, four α indexes were applied 29 shrub at desert sites Xinjiang, including Margalef index, Simpson Shannon–Wiener Pielou to explore relationship between factors (mean annual temperature (MAT) m...
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