نتایج جستجو برای: abundance
تعداد نتایج: 80674 فیلتر نتایج به سال:
background: the species of ectoparasites that live on a specific host in a geographical region form an ectoparasite community. species abundance distributions describe the number of individuals observed for each different species that is encountered within a community. based on properties of the species abundance distribution, the expected total number of species present in the community can be...
in this study, we investigated the importance of vegetation and elevation in the determination of the diversity and abundance of rodents in geno biosphere reserve, hormozgan province. the study area was divided into seven plant types and four elevation classes. the binary similarity coefficients were used for the investigation of the plant types similarity base on the presence of rodents. the m...
soil biodiversity is the origin of considerable goods for maintenance and extension of above ground biodiversity and environmental soundness. this study was carried out in shirvan, mashhad and gonabad, three regions of razavi and northern khorasan provinces, to determine soil characteristics and biodiversity in natural systems of arid and semi-arid regions. in each studied system, 10 locations ...
The aim of the study was to determine the biomass, abundance and species composition ofweeds, as well as macroelement uptake in potato weeded using mechanical, mechanical–chemical and mechanical control combined with the sowing of living mulches of white mustard,common vetch, Persian clover and tansy phacelia. Abundance and biomass of the weeds was themost effectively limited by the mechanical ...
The study comparatively assessed the impacts of farm activities on the abundance and diversity of soil arthropods and soil physico-chemical parameters of the Practical Year Training Programme (PYTP) farmlands, University of Ibadan, South Western Nigeria. Soil arthropods were collected from September, 2010 to February, 2011 in five sampling sites of PYTP farmlands using Berlese Tullgren Extracti...
This paper is to study the resource curse applying annual data from 2002 to 2016 for the Organization of the Petroleum Exporting Countries (OPEC) members i.e. Algeria, Iran, Kuwait, Nigeria, Qatar, Saudi Arabia, United Arab Emirates and Venezuela. For this purpose, there were concerned the interactions role of resource abundance and institution quality, and their marginal effect of the countrie...
Estuaries are one of the most productive aquatic ecosystems that both ecologically and economically are important. The study purposed to investigate the distribution and abundance of phytoplankton from Helleh river estuary (Boushehr- Persian Gulf). Samples were taken in mid-season from summer 2011 to spring 2012 for one year period. Results showed that the dissolved oxygen, temperature, salinit...
Background: Obesity is a complex disorder influenced by various genetic and environmental factors. It has been shown that gut microbiota, which colonizes gastrointestinal tract, has a substantial role as an environmental factor in the pathophysiology of obesity. Since the composition of gut microbiota alters with regard to different criteria, such as ethnicity, geographical location, diet, life...
During a survey of Gahar Lake and Gahar River from 2008 to 2009 some specimen obtained by seasonal sampling in 6 stations, 3 stations in the lake and 3 stations in the river. Three different methods were used for sampling, gill net and hook in the lake and electrofishing in the river. Due to the results 3 species from 2 families in Gahar Lake and 12 species form 3 families in Gahar River were...
The primordial abundance of He, YP , is one of the hottest themes in present-day astronomy, mostly due to its cosmological relevance. The disagreement between different determinations has been currently reduced to the 1-2% level, but these differences are still large enough to have deep implications for Big-Bang nucleosynthesis. It is therefore crucial to estimate precisely the uncertainties in...
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