نتایج جستجو برای: altitude suitability and plant coverage
تعداد نتایج: 16891856 فیلتر نتایج به سال:
Residents of the Tibetan Plateau show heritable adaptations to extreme altitude. We sequenced 50 exomes of ethnic Tibetans, encompassing coding sequences of 92% of human genes, with an average coverage of 18x per individual. Genes showing population-specific allele frequency changes, which represent strong candidates for altitude adaptation, were identified. The strongest signal of natural sele...
The Tibetan grey wolf (Canis lupus chanco) occupies habitats on the Qinghai-Tibet Plateau, a high altitude (>3000 m) environment where low oxygen tension exerts unique selection pressure on individuals to adapt to hypoxic conditions. To identify genes involved in hypoxia adaptation, we generated complete genome sequences of nine Chinese wolves from high and low altitude populations at an averag...
Cellular communications using high altitude platforms (HAPs) will predominate the existing conventional terrestrial or satellite systems but requires some optimization especially in the cellular radio coverage design. The design of HAPs cellular system suffers from increasing cell area when directing the same beam to cover lower elevation regions and therefore requires some modification in its ...
In similar with terrestrial and satellite wireless networks, a new alternative based on platforms located in the stratosphere has recently introduced, known as High Altitude Platforms (HAPS). HAPS are either airships or aircraft positioned between 17 and 22.5 km above the earth surface. It has capability to deliver a wide spectrum of applications to both mobile and fixed users over a broad cove...
Trees' height (H) and diameter (D) growth depend on many factors vary between species. This study examined H D of Juniperus excelsa, J. foetidissima, Pinus nigra, Quercus cerris Q. pubescens, growing naturally in the Central Anatolian forest steppe site conditions (human impact, woody plant coverage, tree density, altitude, exposure) that influence growth. The present hypothesises decline might...
kavir national park is an example of dry and desert ecosystem that is consisted of vast plains and numerous highlands. wild sheep is one of the iconic bovid in this area. understanding their habitat requirements and similarities is essential for their successful population management. we used ecological niche factor analysis approach to develop habitat suitability models for wild sheep in kavir...
Extension of cultivation areas becomes gradually impossible due to ever-increasing population growth and urban area development in Iran. Therefore, it is very important to use the existing cultivated lands more efficiently. Land suitability evaluation makes the sustainable use of the lands feasible. The objective of this study was qualitative, quantitative and economic suitability evaluation ...
We study the capacity of sensor networks with mobile agents. We look at the problem from information theory perspective, and optimize various network parameters such as coverage area, flying altitude, and the trajectory of mobile agents. Multiple mobile agents and the possibility of cooperation among them are also considered.
Background: The content and composition of effective components of medicinal plants in different natural habitats are affected by various factors such as elevation of sea level. Objective: The aim of this study was to investigate the effects of altitude of sea level on the essential oil composition of Ducrosia anethifolia Boiss in its natural habitats in Sistan and Baluchestan province, Iran. M...
Oviposition site selection is an important aspect of the behavioural ecology of insects. A comparison of the habitats used by a species enhances our understanding of their adaptation to altered environments. We collected data on the oviposition behaviours of Gasterophilus pecorum (Diptera: Gasterophilidae) in its habitat in Kalamaili Nature Reserve (KNR), Xinjiang, China between March and Octob...
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