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Publications (19)
We used a model chain to predict cyanobacteria biomass and nitrate (NO3-) concentrations in Lake Võrtsjärv (Estonia), a large, shallow, and eutrophic lake. The model chain was based on the succession of a mechanistic model (INCA-N) and an empirical, generalized linear model. Model calibration and validation were performed with long term climate and...
We aimed to predict cyanobacteria biomass and nitrate (NO3⁻) concentrations in Lake Võrtsjärv, a large, shallow, and eutrophic lake in Estonia. We used a model chain based on the succession of a mechanistic (INCA-N) model and an empirical, generalized linear model. INCA-N model calibration and validation was performed with long term climate and cat...
Ecosystem models that measure the impact of quantitative interactions between trophic levels are widely used tools in ecosystem studies and fishery management. We constructed a mass-balance trophic model using an Ecopath with Ecosim (EwE) modelling suite for large shallow Lake Võrtsjärv, Estonia. The model was calibrated for 36 years (1983–2018) an...
Monitoring heavy metal contaminants in fish is important for the assessment of environmental quality as well as food safety. In this study, European eel samples were collected from Lake Köyceğiz and Lake Võrtsjärv in 2017 and 2018. The concentrations of Mn, Cd, Zn, Pb, and Cu metals were measured by using GF-AAS in four selected tissues of eel, inc...
Climate change shows itself in many different ways on marine life. The fishery is also a part of marine life and affected by climate change-driven weather conditions directly or indirectly. In the present study, relationships between commercial species (grey mullet -≈90% of total capture- and gilthead seabream) that were captured from lagoon traps...
Monitoring heavy metal contaminants in fish is important for the assessment of environmental quality as well as food safety. In this study, European eel samples were collected from Lake Köyceğiz and Lake Võrtsjärv in 2017 and 2018. The concentrations of Mn, Cd, Zn, Pb, and Cu metals were measured by using GF-AAS in four selected tissues of eel, inc...
Phytoplankton usually responds directly and fast to environmental fluctuations, making them useful indicators of lake ecosystem changes caused by various stressors. Here, we examined the phytoplankton community composition before, during, and after a simulated 1-month heat wave in a mesocosm facility in Silkeborg, Denmark. The experiment was conduc...
Shallow lakes are globally the most numerous water bodies and are sensitive to external perturbations, including eutrophication and climate change, which threaten their functioning. Extreme events, such as heat waves (HWs), are expected to become more frequent with global warming. To elucidate the effects of nutrients, warming, and HWs on zooplankt...
Restocking of European eel (Anguilla anguilla) is a widespread practice throughout Europe. Conditions during restocking activities and mortality related to restocking practices have been discussed, however, factors affecting these restocked populations afterwards are mostly not considered. In this study we used a machine learning method followed by...
Relationships between biomass and ecological factors including trophic interactions were examined to understand the dynamics of six fish species in Lake Võrtsjärv, a large shallow eutrophic lake located in Estonia (north-eastern Europe). The database contained initially 31 predictive variables that were monitored in situ for nearly forty years. The...
Changes in the ice phenology, seasonal temperature and extreme events are consistent evidence of climate change effect on lakes. In this study, we analyzed multiannual variability, determined long-term trends and detected changes in the frequency of extreme events in the surface water temperature (LSWT) of Lake Peipsi (Estonia/Russia) for nearly se...
We numerically explored the effects of long-term water level changes on biotic biomass and spatial distribution of fish in a large shallow lake. We calibrated Ecospace model (Ecopath with Ecosim modelling suite) with data from various functional groups (ranging from phytoplankton to piscivorous fish), and considered 14 different habitats. Two scena...
Essential and non-essential total eleven metals and metalloids (Al, B, Cr, Co, Cd, Cu, Fe, Pb, Mn, Ni and Zn) concentrations were determined by ICP-AES in muscle of Squalius fellowesii (Günther, 1868), between November of 2013 and June of 2014, on chosen four stations on Tersakan and Sarıçay streams. Average concentrations (µg g-1 wet weight) in Te...
This study has been carried out in the Esen Stream region, which is of importance for its strategic position as a source of drinking water supply, electricity production, agricultural irrigation, as well as for the presence of rainbow trout Oncorhynchus mykiss. Therefore in his study some important water quality parameters of the inflow and outflow w...
One of the indispensable elements of human life, water is a limited resource. Rapidly increasing world population and efforts put forth to improve living standards of people bring about negative impacts on environmental riches. The purpose of the current study is to investigate the water quality in Gökova Bay, which is threatened particularly in su...
The concentrations of nine metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn), individual total metal load (IMBI) values and metal pollution index (MPI) were determined in water, sediment and European chub, Squalius cephalus (Linnaeus, 1758) inhabiting Sarıçay Stream Turkey. A total of sixty European chub samples and twelve sediment and water samples w...
