Eutrophication of water reservoirs under anthropogenic, agricultural and industrial impacts (example of Southern Poland) (original) (raw)
Related papers
As the main photosynthetic pigment, chlorophyll-a is an indicator to evaluate phytoplankton biomass in aquatic ecosystems. Likewise, measuring chlorophyll-a concentration allows classifying the aquatic ecosystem based on trophy. The present work aimed to seek for any potential correlation between chlorophyll-a concentration with Secchi disk depth as well as water turbidity to facilitate chlorophyll-a determination. Water samples were collected from two adjacent reservoirs. A total of five stations were assumed and the samples were collected during summer and autumn (5 months). Results showed that there was a significant correlation between log chlorophyll-a and log Secchi disk (R2 = 0.72; y = -1.445x + 3.978) as well as between log chlorophyll-a and water turbidity (R2 = 0.60; y = 0.027x + 1.074).
Iranian Journal of Fisheries Sciences, 2013
The Caygoren Reservoir was sampled monthly from February 2007 to January 2009 at three stations to determine the relationships between the chlorophyll-a (Chl-a) dynamics and soluble reactive phosphorus (SRP), nitrate-nitrogen (NO3-N), ammonium-nitrogen (NH4-N), water discharge, water transparency, water temperature (T), specific conductance (SC) and pH. Thermal stratification occurred in the reservoir from May to September. The maximum chlorophyll-a concentrations were measured (using a YSI multi probe) in the fall and the minimu, SRP and NO3-N were significant among seasons (P 0.01). The differences in the Secchi disk transparency were significant both among sampling stations and seasons (P < 0.05). The results of this study suggest that high chl-a concentrations resulted from the increase in available light in the spring and deep mixing in the fall which provided nutrients needed for phytoplankton growth.
2015
TRAYKOV, I. and A. TOSHEVA, 2015. Trophic state and macrophyte based assessment of the ecological status of selected reservoirs in Bulgaria. Bulg. J. Agric. Sci., Supplement 1, 21: 121–125 The objectives of the study were to assess the trophic state and to compare it to the ecological potential of the water bodies according to the macrophyte assemblages within selected reservoirs. The studied reservoirs varied greatly in their trophic status, as well as in species composition and abundance. Sampling was conducted between 2009 and 2014. The concentrations of nutrients and the Carlson’s trophic state indices were used to assess the trophic state of the reservoirs. The trophic state varied between oligo-mesotrophic to hyper-eutrophic, with the majority being eutrophic. A discrepancy between the expected trophic state and the measured one was observed for each water body type. No correlation was observed between the trophic state and the ecological status of the water bodies. Trophic st...
Water
Water quality degradation is one of the most pressing environmental challenges in reservoirs around the world and makes the trophic status assessment of reservoirs essential for their restoration and sustainable use. The main aims of this study were to determine the spatial variations in water quality and trophic state of 204 South Korean reservoirs at different altitude levels. The results demonstrated mean total phosphorus (TP), chlorophyll-a (CHL-a), total suspended solids (TSS), organic matter indicators (chemical oxygen demand: COD; total organic carbon: TOC), water temperature (WT), and electrical conductivity (EC) remain consistently higher in the very lowland reservoirs (VLLR) than those in other altitudes, due to sedimentary or alluvial watersheds. The average TP and CHL-a levels in VLLR crossed the limit of the eutrophic water, symptomizing a moderate risk of cyanobacterial blooms. Empirical models were developed to identify critical variables controlling algal biomass and...
TROPHIC STATUS AND ECOLOGICAL POTENTIAL OF RESERVOIRS IN BULGARIA BASED ON SELECTED PARAMETERS
Annuaire de L’Universite De Sofia “Kliment Ohridski”, 2017
The Water Framework Directive (WFD) aims to achieve good ecological status (potential for heavily modified water bodies) of surface waters. Ecological status is characterised by the quality, structure and functioning of aquatic ecosystems. It is quantified through chemical and ecological parameters, with standard biological quality elements (BQE) for lake ecosystems (natural or artificial) being phytoplankton, macrophytes, phytobenthos, benthic macroinvertebrate and fish communities. The trophic state of reservoirs indicates their biological productivity and is usually assessed from data on phosphorus, chlorophyll a concentrations and Secchi depth. Our aim was to study the physical and chemical parameters of the water column, as well as the primary productivity (quantified as chlorophyll a). Here we present some preliminary results for eight Bulgarian reservoirs: Bebresh, Gorni Dabnik, Telish, Sopot, Sinyata Reka, Konush, Chetiridesette Izvora and Pchelina Reservoirs. Samples were collected from several stations and different horizons in spring and summer 2016.
Trophic state of a lowland reservoir during 10 years after restoration
Hydrobiologia, 2003
The restored Maltañski Reservoir was studied from its filling with water in 1990 till 2000. Total phosphorus, chlorophyll-a, and Secchi depth, as well as the Carlson's trophic state index (TSI) values based on those three parameters showed characteristic patterns of changes among seasons and years. Within each year, the lowest trophic state was usually observed in winter and the highest in summer. Because of the high loads of phosphorus received by the reservoir, this element did not limit primary production. TSI values calculated on the basis of total phosphorus were always markedly higher than calculated on chlorophyll-a and Secchi depth (similar to each other). The trophic upsurge phase lasted only a few months after the filling of the reservoir in 1990. Similar symptoms were observed after its refilling in the spring of 1993. The trophic depression phase lasted until the end of 1995. After that time a significant correlation between phosphorus concentration in the reservoir and in river waters flowing into the reservoir was observed. The successive phases of reservoir ageing, determined on the basis of phosphorus concentration, were not accompanied by changes in chlorophyll-a content. The influence of the top-down mechanism (biomanipulation effect) resulted in relatively low values of chlorophyll-a after the filling of the reservoir with water in 1990 and in 1993. As early as 1992 chlorophyll-a values reached a very high level and stayed at that level until the end of the study in 2000 (except for the short decline in 1993).
Assessment of temporal and spatial eutrophication index in a water dam reservoir
Global Journal of Environmental Science and Management, 2018
Eutrophication is considered as a serious problem in water reservoirs. Awareness about the eutrophic status of each reservoir could help in providing a better understanding of the problem in a global scale. The present study was conducted to assess temporal and spatial eutrophication index in a water reservoir (Sahand dam) in the northwest of Iran. Physico-chemical parametres that are effective on eutrphic condition occurrence were analyzed, and trophic state index was calculated on a scale of 0-100 by measuring Secchi disk depth, chlorophyll a, total phosphorus, total nitrogen, total suspended solids, and phosphorus P/N ratio. Moreover, using the overlapping, the reservoir was mapped based on the mentioned index. Seasonal variation of dissolved solids in the reservoir was recorded due to precipitation and subsequent dilution and evaporation. Thermal stratification was observed during the summer months. The total trophic state index value was calculated as 55.5- 58.07, with minimum...