نتایج جستجو برای: caspian sea kutum
تعداد نتایج: 131902 فیلتر نتایج به سال:
alburnus chalcoides , caspian shemaya, is found in the river systems of the aral, black and caspian sea basins and is an economically valuable cyprinid from the southern caspian sea. this species has been reported as near threatened species in this basin due to damming, over and illegal fishing, destruction of its spawning grounds and water pollution. the caspian shemaya is an important species...
The experiments with Beroe ovata showed that this ctenophore can survive and reproduce in the Caspian Sea water, though at far lower rate than in the Black Sea; larval growth in the Caspian Sea water was also slower and mortality higher. Maximum fecundity of 2210 and 240 eggs recorded in laboratories of Turkey and Iran, respectively. About 34 to 100% of eggs in the Caspian Sea water could not d...
Heavy metals are one of the main groups of environmental pollutants; enter the aquatic environment through natural and human activities. These metals may accumulate in aquatic organisms including fish and be a potential danger to the health of the ecosystem and living organisms, especially for human beings. In this study, the amount of heavy metals including copper, zinc, and nickel was investi...
In this study, we investigate the sources of moisture (and moisture for precipitation) over the Danube River Basin (DRB) by means of a Lagrangian approach using the FLEXPART V9.0 particle dispersion model together with ERA-Interim reanalysis data to track changes in atmospheric moisture over 10-day trajectories. This approach computes the budget of evaporation-minus-precipitation by calculating...
BACKGROUND AND OBJECTIVES The US Environmental Protection Agency has suggested faecal enterococci as the primary bacterial indicators. Of more importance is their direct correlation with swimmer-associated gastroenteritis in recreation water quality monitoring. In contrast to other seawater bodies with 3.5% salinity, the recreational waters in the southern coast of the Caspian Sea possess its o...
the causes of wintertime precipitation decrease in the southern coast of caspian sea (sccs) compared to its counterpart in autumn, is investigated with the use of synoptic stations daily dataset of sccs and gridded ncep/ncar and noaa dataset. the structure of atmospheric circulation and synoptic and physical conditions over the caspian sea region which are dominate in the winter and autumn prec...
the aim of this paper is investigating and studying of geopolitical dimensions of russia in the caspian sea. russian post-soviet geopolitics invokes euroasianism as its inner rationale and meaning, as a greater good that imbues pragmatic, interest based politics with a sense of mission. eurasianism as a particular tradition of theorizing russia’s identity and place in the world has a momentum o...
the changes in density and biomass of macrobenthos were seasonally investigated from winter 2005 till fall 2006 in southern caspian sea. samples were taken with a 225cm2 van veen grab from depths of 7 and 20 meters along two transects: line 8 area (western part) and radio darya area (eastern part). totally, 5 classes of macrobenthos were identified of which the most abundant populations were po...
this research was conducted in sefid-rud river of southern caspian sea and amounts of ionic (sodium, potassium, magnesium and calcium) and metabolic (cholesterol, total protein and glucose) parameters in 35 maturated and 45 immature female kutum blood determined. fish samples were collected monthly from march to may in 2008. blood samples were taken from the caudal vessels. no abnormalities or ...
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