Aynı havzadaki sığ göllerin ekolojik yapısının belirlenmesinde su seviyesi değişimi, besin tuzlarının yoğunluğu, ve balık stokunun değişen rolleri (original) (raw)
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2013
The Rui lake [situated 9 km away from Digras Tahsil Dist.- Yavatmal (M.S.)] is a life line for the people in these area because the lake is source of water for household and drinking purpose. Lake is major source of water supply for domestic purpose in the villages as well as many rural areas of India. In many instance lake water is used directly for drinking and other household purposes and hence the quality of lake water is extremely important (Garode et al). Lake play an important role in development of nation and sustenance of life which are being disturb due to the developmental activities (Mohammad Alam & Pathak J.K. 2010). Various physico-chemical factors governs lakes & aquatic bodies in nature. The parameters studied such as air temperature, water temperature, pH, total dissolved solid, dissolved oxygen, total hardness, chloride. Attempt to study the ecology of specific dam or lake over a period of one year or more to evaluate the seasonal changes, Arber (1920) has emphasiz...
Reaction of large and shallow lakes Peipsi and Võrtsjärv to the changes of nutrient loading
Hydrobiologia, 2007
More than 20-year monitoring of Estonian rivers reveals that the loading of nitrogen to large shallow lakes Peipsi (3,555 km2, mean depth 7.1 m) and Võrtsjärv (270 km2, mean depth 2.8 m) decreased substantially in the 1990s. Phosphorus loading decreased to a much smaller extent than nitrogen loading. In L. Võrtsjärv both N and P concentrations followed the decreasing trends of loading, which show the high sensitivity of large shallow lakes to catchment processes. Our study showed a positive relationship between P content in sediments and the relative depth of the lake. Assumingly the resilience of a lake in responding to the reduction of nutrient loading decreases together with the decrease of its relative depth. In L. Peipsi the concentration of P has not decreased since the 1990s. Our data show indirectly that P loading from Russia to L. Peipsi may have increased. The N/P ratio has decreased in both lakes. Cyanobacterial blooms have been common in both lakes already at the beginning of the 20th century. The blooms disappeared during heavy nitrogen loading in the 1980s but started again in L. Peipsi in recent years together with the drop of the N/P ratio. In L. Võrtsjärv the N/P ratio is higher and the ecosystem is more stable although the share of N2-fixing cyanobacteria increased from the 1990s. Reappearing cyanobacterial blooms in L. Peipsi have caused fish-kills in recent years. In L. Peipsi summer/autumn fish-kills during water-blooms are a straightforward consequence of reduced nitrogen level at remaining high phosphorus level while in L. Võrtsjärv the climatic factors affecting water level are more critical––at low water level winter fish-kills may occur. In L. Võrtsjärv nutrient loading has decreased and water quality has improved, present ecological status seems to be mostly controlled by climatic factors through changes of water level. The most important measure to improve water quality in L. Peipsi would be the reduction of phosphorus loading from both Estonian and Russian subcatchments.
Investigations on Some Physicochemical Parameters of Demirköprü Dam Lake (Manisa, Turkey)
Turkish Journal of Agriculture - Food Science and Technology,, 2018
This study was carried out at 3 different stations in Demirköprü Dam Lake, Köprübaşı, situated in Manisa, between June 2015 – May 2016. Samples collected from the surface and the bottom of the lake were analyzed seasonally in terms of depth (m), temperature (°C), dissolved oxygen (DO), pH, salinity (‰), total dissolved solids (TDS), electrical conductivity (EC), secchi disk depth (SD), suspended solid matter (SSM), particulate organic matter (POM), particulate inorganic matter (PIM), ammonium nitrogen (NH4+-N), nitrite nitrogen (NO2--N), nitrate nitrogen (NO3--N), phosphate phosphorus (PO4-3-P), silica (SiO2) and Chlorophyll-a parameters. As a result of this study, according to Inland Water Quality Standards defined in Surface Water Quality Management Regulations (SWQMR) Demirköprü Dam Lake can be considered; Class-I quality according to measured temperature (15±1.3°C), NO2--N (0.010±0.003 mg/l) and NO3--N (0.04±0.01 mg/l) values; Class-II quality according to measured DO (6.86±0.90 mg/l), EC (591±6.4 μS/cm), SSM (5.90±6.40 mg/l), NH4+-N (0.30±0.09 mg/l) and PO4-3-P (0.08±0.01 mg/l) values; Class-III quality according to measured pH (8.72±0.09) values. Also, according to Turkish Boundary Values of Trophic Classification System of Lakes, Ponds and Reservoirs; the trophic level of the lake is considered eutrophic in regard to PO4-3- and SD values and hypereutrophic in regard to Chlorophyll-a values.