نتایج جستجو برای: trophic state index
تعداد نتایج: 1243378 فیلتر نتایج به سال:
The Aras reservoir, located in the north-west of Iran, plays an important role in fisheries, drinking and agricultural water supplies and recreational activities in the region. This study was performed to characterize the seasonal fluctuations of phytoplankton communities and their relationship with environmental factors in the Aras reservoir from August 2013 to May 2014. Sampling was carried o...
Measurement of chlorophyll-a can be considered important to investigate the primary production of an ecosystem. This study aimed to investigate chlorophyll-a concentration, primary production and the factors affecting them in Shadegan Wetland located in Khouzestan Province - Iran. Sampling for measuring (NO3, PO4, BOD5, DO, pH, EC, salinity, temperature) was performed seasonally at five samplin...
in order to increase the knowledge of saurida tumbil biology and ecology, an investigation of food habits of this species was conducted from october 2010 to september 2011 in bushehr coastal waters, persian gulf. 485 fish stomach contents were studied. in this study the frequency of occurrence of prey, feeding intensity index, the index is empty stomachs, the mean trophic levels and the rate of...
Many different methods of reporting animal diets have been used in ecological research. These vary greatly in level of accuracy and precision and therefore complicate attempts to measure and compare diets, and quantitites of nutrients in those diets, across a wide range of taxa. For most birds, the carotenoid content of the diet has not been directly measured. Here, therefore, I use an avian ex...
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