نتایج جستجو برای: today as freshwater resources become scarcer
تعداد نتایج: 5870903 فیلتر نتایج به سال:
1. Rice is an important agricultural production system with more than 80 million ha of irrigated rice paddies in annual production globally. As water resources become scarcer, the competition between urban development and agriculture for available water will intensify. Paddy rice cropland distribution and management intensity will need to evolve over the coming decades to accommodate increased ...
cultural iran is a scope that is more extended than the political territories of iran as a political unit. this concept means that cultural geography(mehdi moghanlo-1383-1) of iran is greater than its political geography which, according to history, has a long history extending west-east from kandahar to the euphrates and north-south from the persian gulf to the caucasus including transoxiana a...
in reality, most structures involved in geotechnical engineering are three dimensional in nature, and although in many, plane strain or axisymmetric approximations are reasonable, there are some, for which 3-d treatment is required. the quantity of data, and the size of the various vectors and matrices involved in such analysis, increase dramatically. this has sever implications for computer r...
The medaka Oryzias latipes is a small egg-laying freshwater teleost, and has become an excellent model system for ecotoxicology, developmental genetics, genomics and evolutionary biology studies. A high-quality draft genome sequence (700 Mb) of the medaka inbred strain, Hd-rR, has now been completed. In this review, we present an overview of the medaka genome project and describe the substantia...
We investigate extinction dynamics in the paradigmatic model of two competing species A and B that reproduce (A→2A, B→2B), self-regulate by annihilation (2A→0, 2B→0), and compete (A+B→A, A+B→B). For a finite system that is in the well-mixed limit, a quasistationary state arises which describes coexistence of the two species. Because of discrete noise, both species eventually become extinct in t...
Abstract Background Chemical pollution forms a severe threat for human and environmental health. While the risks European lowland water bodies are well known, there is little knowledge on remote aquatic ecosystems particularly mountain lakes, despite their importance provision of freshwater. Here, we critically review current exposure risk by chemical lakes present tiered approach how to advanc...
Endemic fishes are part of the genetic resources in aquatic habitats. The Caspian Sea, as the largest lake in the world, has a unique habitat diversity and is of great importance for the countries of the region. Over the recent decades, with the increase in the level of anthropogenic sound, its effects on freshwater and marine fishes have been considered by fisheries managers and stakeholders. ...
The term “wetlands” means those areas that are inundated or saturated by surface water or groundwater at a frequency and duration sufficient to support a prevalence of vegetation typically adapted for life in saturated soil conditions. They are located at the ecotones between dry terrestrial ecosystems and permanently wet aquatic ecosystems. As such, they have an intermediate hydrology, a bioch...
rivers and runoff have always been of interest to human beings. in order to make use of the proper water resources, human societies, industrial and agricultural centers, etc. have usually been established near rivers. as the time goes on, these societies developed, and therefore water resources were extracted more and more. consequently, conditions of water quality of the rivers experienced rap...
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