نتایج جستجو برای: eutrophic environment
تعداد نتایج: 520351 فیلتر نتایج به سال:
the qom formation in naragh area, with 185 meter thickness, is exposed about 25 km northeast of delijan. this formation in the studied area, lithologically, consists of shale, gravely limestone, and sandy limestone, with thin, medium to thick bedded and massive limestons. it disconformably covers the lower red formation and is covered by recent alluvium. in this research, the role of large fora...
Small mountain lakes are natural archives for understanding long-term and anthropogenic impact on the environment. This study focused (last ca. 13 000 years) vegetation changes sedimentary processes in catchment area of Lake Planina pri jezeru (1430 m a.s.l.) by using mineralogical, geochemical palynological methods. Palynological results suggest that regional between 12 900 11 700 cal a bp was...
Transmission electron microscopy (TEM) and epifluorescence microscopy were used to obtain comparative measurements of total bacterial counts, and to enumerate abundances of various bacterial morphotypes in an eutrophic freshwater habitat. Although particulate matter would have been expected to interfere with counting by obscuring large areas of the electron microscope grids, estimates of total ...
We investigated the nitrogen and phosphate nutrient status in the habitats of Alternanthera philoxeroides and its co-occurring algal growth in a field survey. We also determined the algicidal activity of A. philoxeroides extracts from a diversity of habitats in Chaohu Lake, China, in the laboratory. We then tested the correlation between the nutrient status and the algicidal activity of A. phil...
Numerous methods have been developed for the quantitative assessment of eutrophication: statistical techniques, simulation models and water quality indicators are the most widely used techniques to assess trophic levels. All these methods share a common goal: to evaluate the environmental impact due to high nutrient concentrations / phytoplankton biomass and classify the waters into oligotrophi...
Biofi lm formation is a well known phenomenon in the medical and health care fi elds. Biofi lm infection has recently attained a greater importance as an intractable infectious disease since the number of persons easily infected is rising as the percentage of the elderly population increases (Costerton et al., 1999). The environmental hygienic equipment and paper manufacturing industries call t...
Recent studies from temperate lakes indicate that eutrophic systems tend to emit less carbon dioxide (CO2) and bury more organic carbon (OC) than oligotrophic ones, rendering them CO2 sinks in some cases. However, the scarcity of data from tropical systems is critical for a complete understanding of the interplay between eutrophication and aquatic carbon (C) fluxes in warm waters. We test the h...
Microorganisms can both indicate the water quality characteristics and health of aquatic environment, which have an important influence on cycling organic carbon, nitrogen (N), phosphorus (P) in nature. In this study, we took Taihu Lake, a typical eutrophic lake China, as research object, monitored northern (Changzhou City) southern (Changxing County) regions Lake for three consecutive years (2...
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