Liliana Teodorof

Danube Delta National Institute for Research and Development (DDNIRD) · Laboratories and Research Stations

The Chilia branch is the north branch of the Danube River at the Romania-Ukraine border in the Danube Delta; it is a complex system with economic and ecological values. The surface water quality is a major concern and monitoring programs have been developed at the national and international level. The objective of this study was to evaluate the wat...

Haliaeetus albicilla is a top raptor that can be used as a model for contaminants transfer in trophic chain. In this study we studied the accumulation of three contaminants on feathers from breeding individuals of white-tailed sea-eagle collected between 2012 and 2018 in the Danube Delta Biosphere Reserve and its surroundings. The concentrations of...

The paper presents the main tackled issues and results concerning the monitoring of the toxic substances (TOXs) in the network established in the frame of BSB27 MONITOX project, implemented by «Dunarea de Jos» University of Galati, Romania (Leader Partner) in partnership with Institute of Zoology, Republic of Moldova, International Hellenic Univers...

In this paper a class consisting of 8 environmental toxicants were selected to assess Danube River water quality between Calarasi-Silistra sector until the river flow into the Black Sea, the Romanian Monitox Network Area. A comprehnsive comparison between 2 years of investigations in terms of nutrients contribution, such as different forms of nitro...

This article presents the results of studying the content of mineral (ammonium ions, nitrites and nitrates) and organic nitrogen compounds in water samples collected from the Dniester river in 2020. In the study are examines the seasonal dynamics of the forms of mineral nitrogen, total nitrogen and the correlation between organic and mineral nitrog...

The Danube Delta is the newest land formed by both transporting sediments brought by Danube River, which flows into the Black Sea and by traversing an inland region where water spreads and deposits sediments. Diurnal tidal action is low (only 8–9 cm), therefore the sediments would wash out into the water body faster than the river deposits it. Howe...

In order to quantify the NO, NO2 and NOX, SO2, CO and PM emissions from ship traffic on the Danube, seasonal measurements (autumn, spring and summer) were performed during the period 2017-2018, using high precision mobile equipment. It is the first-time air quality monitoring actions and activities of this type have been carried out on inland water...

The development of chlorophyll a is dependent on a number of physico-chemical factors with high sensitivity to changes in water properties. Among the factors that influence the development of chlorophyll the most important are pH, temperature, solid suspensions, salinity, light, transparency, hydrology, and human activities. The sampling was carrie...

The assessment of sediments quality from Romanian part of MONITOX Network was performed using both single indices - Single Ecological Risk Index (ErMe), Contamination Factor (CF Me), Enrichment Factor (EF Me), Geoaccumulation Index (Igeo Me) - and integrated indices - Ecological Risk Index (RI), Global Pollution Index (PLI), Nemerow Pollution Index...

The International Conference “Environmental Challenges in the Black Sea Basin: Impact on Human Health” is organized by Dunarea de Jos University of Galati (UDJG), Romania, in the frame of the project with code BSB27, "Black Sea Basin interdisciplinary cooperation network for sustainable joint monitoring of environmental toxicants migration, improve...

Designated in 1990 as Biosphere Reserve under UNESCO’s MAB program and Wetland of International Importance under the RAMSAR Convention in 1991, Danube Delta is the largest best preserved of Europe’s deltas. Despite that, its ecosystems are affected by upstream conditions, the Romanian Danube being the end carrier of all wastewater discharges from u...

Abstract: This paper discusses the evolution in time of water quality parameters in Razim-Sinoe aquatic complex, the largest surface water in the natural system in Romania, situated in the southern part of the Danube Delta Biosphere Reserve. For this purpose, data regarding mean values of nutrients concentrations (nitrogen from ammonium, nitrogen f...

bstract: Actual study is focused on assessment of heavy metals (cadmium, lead, chromium, nickel, and zinc) concentration from Danube river sediment and aquatic macroinvertebrates. The sampling point is located along the Danube river. Ecosystem characteristics and anthropogenic influences located in the area were taken into consideration when select...

Abstract: In order to identify and quantify a new class of pollutants, the microplastic, originating from anthropogenic activities, proposed to be included in the list of indicators monitored for deltaic ecosystems quality establishment, it was necessary to carry out a screening of the literature regarding the pollution of continental waters and ma...

bstract: Zaghen polder is a wetland of faunistic, landscape and recreational area for Tulcea town and the surrounding turism attraction. The phytoplankton analisys consisted in sample prelevation and measurements in four points in polder area. Measurements on phytoplankton amount were made with submersible spectrofluorometer, wich uses light intens...

The MONITOX International Symposium “Deltas and Wetlands” is organized by Danube Delta National Institute for Research and Development, Tulcea (DDNI) and Dunarea de Jos University of Galati, (UDJG), Romania, in the frame of the project with code BSB27, "Black Sea Basin interdisciplinary cooperation network for sustainable joint monitoring of enviro...

ecosystem services, including food production, freshwater, flood control, nutrient cycling, spiritual values and opportunities for recreation. Despite growing recognition of their societal and ecological importance, deltaic flood plains are declining worldwide at alarming rates. Loss of wetland ecosystem services bears socio-environmental costs ove...

ABSTRACT In the Danube Delta Biosphere Reserve (Romanian part) an estimation was carried out in 2015 regarding heavy metal residues in the feathers of native wild bird species that depend on wetlands for all or part of their life cycle. The concentration of trace elements (As, Cr, Mn, Ni, Pb and Zn) was determined in the feathers of White Stork, Py...

An assessment was carried out in the Danube Delta Biosphere Reserve (Romania, 2015) regarding heavy metal residues in the feathers of native wild bird species that depend on wetlands for all or part of their life cycle. The concentrations of trace elements (As, Cr, Mn, Ni, Pb and Zn) were determined in the feathers of Ferruginous Duck, White Stork,...

Nutrients (nitrites, nitrates, phosphates) are essentials for organisms life that use photosynthesis. An excessive growth of these aquatic organisms or contrary may cause an imbalance in the entire aquatic ecosystem. Therefore, the present study aims to determine seasonal dynamics of nitrogen concentrations from ammonia, nitrites, nitrates, total n...

The main propose of this study was to assess the levels of some toxic substances in expressing the pollution degree of the aquatic ecosystems. A ten-year investigation of 4 heavy metals (such as As, Pb, Ni, Cr) in surface water and sediments samples from a representative aquatic complex in Danube Delta Biosphere Reserve (Matita-Merhei) was accompli...

Abstract Researches and analysis of heavy metals concentrations in the fish species exploited as a food source are of great interest due to long term toxic effects on human health even at very low concentrations. Therefore, we have conducted this study in an area of great interest in terms of aquatic biodiversity, but also of tourism and trade. D...

The term ”plankton” refers to those microscopic aquatic forms having little or no resistance to currents and living free-floating and suspended, in open or pelagic waters. Phytoplankton development has different consequences depending on biomass quality and quantity, the overgrowth result being eutrophication process. The eutrophication intensity c...

In this paper, the development of a Web-based GIS system for the monitoring and assessment of the Black Sea is presented. The integrated multilevel system is based on the combination of terrestrial and satellite Earth observation data through the technological assets provided by innovative information tools and facilities. The key component of the...

The main purpose of this study is to integrate the chemical parameters in a single index, one for surface water and one for sediment to define the quality according to the Water Framework Directive, as an important step to take measures to reduce the impact on water bodies. In order to determine the ecological status of surface waters and sediments...

This paper presents a study on the zooplankton and benthic invertebrate community in shallow lakes from Danube Delta Biosphere Reserve. Samples have been collected three times in each season except winter in 2014. At each lake zooplankton was collected with plankton net from 5 stations and benthic invertebrates with an Ekmann dredge from three stat...

This study presents the analysis of the temporal trends and evolution of inorganic micro-pollutants originated from Somova–Parches aquatic complex. The main goal of the study is giving a general overview of human impact in this area and evaluating the effectiveness of environmental projects aimed to improve the water quality. Annual mean concentrat...

The present report is produced in the frames of the Joint Operational Project “Research networking for the environmental monitoring and mitigation of adverse ecological effects in the Black Sea Basin–BSB Net-Eco” submitted on November 3, 2013, according to the terms of the contract No.50503/25.06.2013, between the Lead Partner (“D. Ghitu” Institute...

bstract: In order to improve the quality of life, in urban ranges, there is a continuous effort for small-scale leisure areas maintenance in the benefit of inhabitants by means of provided environmental, social and psychological services. Nevertheless, much less concern is being given to nature preservation and species diversity that could be an ec...

Heavy metals are released into environment from natural and anthropogenic sources. We measured cadmium, chromium, nickel, lead, manganese and zinc in four wetlands species (Phragmites australis, Typha angustifolia, Potamogeton pectinatus and Stratiotes abides) collected during 6 years (2007-2012) from Somova Parches aquatic complex belonging to Dan...

The aquatic ecosystem of the Danube Delta Biosphere Reserve is constantly being subjected to various kinds of pollution. This system receives a huge quality and quantity of wastes such as industrial and domestic discharges from several countries crossed by the Danube river. The study was conducted to roughly estimate zooplankton and macroinver...

Mercury is one of the few metals which strongly bioconcentrates and biomagnifies, and has only harmful effects with no useful physiological functions when is present in fish and wildlife, and is easily transformed from a less toxic inorganic form to a more toxic organic form in fish tissue. One organic form of mercury, methyl mercury, is of particu...

The aim of the present study is to determine the accumulation of heavy metals in plankton collected from four aquatic complexes: Somova-Parcheş, Şontea-Fortuna, Holbina-Dunavăţ (with the highest concentrations of heavy metals) and Matiţa-Merhei, from the Danube Delta area, one of the most important Biodiversity Reserve in Europe. In order to achiev...

Mercury is one of the few metals which strongly bioconcentrates and biomagnifies, and has only harmful effects with no useful physiological functions when is present in fish and wildlife, and is easily transformed from a less toxic inorganic form to a more toxic organic form in fish tissue. One organic form of mercury, methyl mercury, is of particu...

The impact of inorganic nutrient enrichment on reophillic ecosystems has been observed and intensively studied in many rivers. Due to the scarcity of information on ecological conditions in the channel-network of the Danube Delta it is very important to have reliable information on the trend of the abiotic and biotic quality elements in the Danube...

The paper presents the preparation of selenium yeast from spent brewer's yeast by using industrial nutrient medium (malt wort and sparge water). The chemical treatment of the yeast biomass was done with sodium-selenite solution. The preparation of selenium – enriched Saccharomyces uvarum in different conditions of temperature, time, yeast biomass p...

The quality indicators of Danube Delta lakes are established according with the Romanian Normative 161 / 2006. The sampling points are: Somova, Fortuna, Nebunu, Merhei, Miazazi, Erenciuc, Uzlina, Isac. The selected heavy metals are: arsenic, cadmium, nickel, lead. First the samples were digested at the microwave oven, and then there were analyzed a...

The work presents the preparation of selenium yeast from spent brewer's yeast by chemical treatment of yeast biomass with sodium-selenite solution. It was made a comparative study of preparation procedures in different conditions of temperature, time, yeast concentration and selenium solution concentration. The Wickerham culture medium and malt wor...

In this study, the influence of pH, temperature and dissolved oxygen on the heavy metals distribution in fish tissue were studied. The bioaccumulation factors of fish tissues were calculated. The heavy metals bioaccumulation was compared in gills, scales, livers, tissue for all the selected fish species: carp (Cyprinus carpió), silver carp (Hypopht...

In this study, we applied the equilibrium partinioning method to the Danube Delta lakes sediments, to derive an applicable set of quality criteria for aquatic ecosystems. The partition coefficients, Ksp were calculated for the Danube Delta three lakes type, using the medium cadmium concentrations (between 1997-2007) and the suspended matter concent...

The proper choice of a measurement technique is only one step in the development of a successful application. All steps leading up to the measurement are equally important to the sampling and the sample preparation process begins at the point of collection and extends to the measurement step. The sample preparation method used to convert the sample...

Based on flow injection techniques, FIMS is fully automated, fast, and cost-effective. The FIMS uses a high-performance single-beam optical system with a low pressure mercury lamp and solar-blind detector for maximum performance. The FIMS-400 has two stepper motor-driven peristaltic pumps for greater flexibility when used with optional accessories....

In this study, there were selected two sample types: sediments and three types of aquatic vegetation from Danube Delta Biosphere Reserve: Scirpo- Phragmitetum, Typha angustofila and Stratiotetum aloides. The samples were taken during 2008, from may to august. For the aquatic vegetations the humidity, the total carbon and the heavy metals (Cd, Mn, N...

The present work includes a model for assessing the ecological status of shallow lakes, based on the principle of the integrative method used previously in Finland, Sweden, Estonia, Denmark, Germany, Poland, Great Britain and Holland. The authors included into the respective method those elements that are local-specific to the Danube Delta, taking...

ABSTRACT. The authors performed an assessment of the frequencies of quality classes and degrees of eutrophication of various waters from the Danube Delta Biosphere Reserve, in the 2001 – 2007. For the analyses there were taken into account the following elements: concentration of phosporus, concentration of ammonium and characteristics of algal blo...

1 -Leaf litter decomposition rates in aquatic ecosystems are known to be related to many abiotic and biotic factors. 2 -Here, field experiments were carried out during fall 2005 in four sites of the Danube Delta system, differing mainly in terms of type and characterised by euthrophycation. 3 -The litter bag technique was used to study reed decompo...

BSTRACT. The proper choice of a measurement technique is only one step in the development of a sucessful application. All steps leading up to the measurement are equally important. The sampling and the sample preparation process begins at the point of collection and extends to the measurement step. The sample preparation method used to convert the...

A major role in terms of danger to the aquatic ecosystem is played by heavy metals, which stand out by their persistence and accumulability. In this study an overview on recent monitoring (2003-2005) of some heavy metals (Cu, Zn, Cd, Pb) analyzed in fish species, plants and benthic macro invertebrates from Danube Delta Biosphere Reserve.In the syst...