Marian Tudor

Danube Delta National Institute for Research and Development (DDNIRD)

The present study aimed to provide a review on the trophobiology of the golden jackal Canis aureus in the Danube Delta Biosphere Reserve (DDBR) and surroundings and to investigate its implication for economic losses in local rural communities. The damage evaluation was performed by direct questioning of locals and written questionnaires. Most local...

The aim of this study represents a complex approach regarding the analysis of the flora, aquatic and palustre vegetation as well as the diversity of nesting bird species on Somova-Parches Lacustrine Complex. Aquatic and palustre vegetation conveys 23 vegetation assemblages, five habitats of national interest, and three community habitats featuring...

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...

Danube Delta is a place where the environment, economic activities, traditions and culture form the identity of the place. Changes in the development of economic activities are determined by seasonal dynamics, directly influencing the daily life of the inhabitants in the area. This aspect also contributed to a demographic decline of local communiti...

This article tells the story of possibly the first ecological restoration project in the postsocialist world (1994), which is an example of a broader set of ecological restorations carried out in Eastern Europe. By exploring the two intertwined processes of the ecological restoration of an island in the Danube Delta and the advancement of neolibera...

This article tells the story of possibly the first ecological restoration project in the postsocialist world (1994), which is an example of a broader set of ecological restorations carried out in Eastern Europe. By exploring the two intertwined processes of the ecological restoration of an island in the Danube Delta and the advancement of neolibera...

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...

Abstract: We identified 222 published papers on the subject of White-tailed Sea-eagle in Romania. We devided them according to the time scale. From the period 1726-1898 we identified 6 papers; between 1912-1940, 22 papers, between 1944-1964, 15 papers, between 1965-1990, 53 papers and after 1991 until now, we found 126 scientific papers containing...

The number of White-tailed Eagles (Haliaeetus albicilla Linnaeus 1758) wintering in the Danube Delta Biosphere Reserve (D. D. B. R.) was investigated in the period 2016-2018. In the period between October through March of each year we recorded a total of 312 individuals. Of these, 67% were adult birds, 17% juveniles and 16 % immature. The wintering...

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...

The floodplain of the Lower Danube was formed by the complex action of erosion and river accumulation, under the influence of the ascension trend of the river riverbed during the Holocene and the oscillation of the water levels and discharges. Almost full embankment and the construction of non-submersible dams have affected both the hydro-geomorpho...

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...

The history of waterbird colony monitoring on the present territory of the Danube Delta Biosphere Reserve shows that the localisation, size and composition of these colonies can suffer significant changes over the span of years. The Purcelu, Nebunu and Martinca colonies are some of the oldest known colonies in the area that are still used today. Du...

Abstract. The history of waterbird colony monitoring on the present territory of the Danube Delta Biosphere Reserve shows that the localisation, size and composition of these colonies can suffer significant changes over the span of years. The Purcelu, Nebunu and Martinca colonies are some of the oldest known colonies in the area that are still used...

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...

The general objective of the study is to benefit by sustainable management of fish from one pilot reconstruction area of Danube delta, Holbina 1. In order to achieve this objective, the project team proposed to determine the fish ecological status after ecological reconstruction, also determine natural fish potential of the respective aquatic basin...

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...

In this work we present some of the data about the nesting ecology of the White-tailed Eagle (Haliaeetus albicilla) collected during 2009-2018 in the Danube Delta Biosphere Reserve and its surroundings. A total of 144 different nests (occupied, unoccupied and destroyed) were recorded in this period. We also recorded 7 breeding pairs (territories) w...

The study presents the results of the monitoring of all identified colonies of waterbirds in the Danube Delta Biosphere Reserve, without the pelican species, in the period between 2015 and 2018. We compared our results with those from a previous study in 2001. The largest number of total breeding pairs for all colonial waterbird was recorded in 201...

In this paper are presented preliminary results of seasonal statistical approach on monitoring of a series of drilled water well corresponding on a surface of about a quarter of Galati County which has a total area of 4,466 square km. In order to offer an adequate picture of the status of this natural resource we started a monthly monitoring progra...

This article presents data on the nesting ecology of the White-tailed Eagle (Haliaeetus albicilla) collected during 2009-2017 in the Danube Delta Biosphere Reserve and its surroundings. A total of 127 different nests were recorded in this period. The preferred tree species for nesting in the area were the White Willow (Salix alba) with 64 % of all...

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,...

Introduction The expansion of the jackal area is a process that we've yet to understand, whether is natural (due to intrinsic or extrinsic factors) or caused by humans (due to wolf elimination, poorly managed animal wastes, increase of protected areas, animal management, etc.). In recent years, many locals from Danube Delta Biosphere Reserve (DDBR)...

Delivering decision-making based on a systemic approach to the reality tackled is an increasingly important condition for increasing the efficiency of using the resources needed to implement environmental programs and projects. Therefore, the hierarchical organisation of the whole reality, recognised as a strictly objective truth, must also be refl...

Fragmentation analysis of a coastal biosphere reserve is an important step in the decision management system, as it identifies vulnerable areas in terms of human pressure. For a better understanding of the anthropisation degree, three coastal sites were chosen within the Danube Delta Biosphere Reserve (D.D.B.R.), from north (Sulina) to south (Porti...

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...

Bala "problem" about navigation

The dynamics, of the systems belonging to the natural capital is the result of the interaction between their own structural and functional parameters with external factors, among which one can identify those generated by projects for ecological reconstruction. Starting from this conclusion, one can compare the parameters before and after applying t...

The structure and volume of activities for biodiversity conservation are determined mainly by the vulnerability of its various components and resources that can be used to this purpose. The decisional factor intervention in the limited time and the limited character of the resources which can be allocated require setting priorities for action in t...

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 dynamics, of the systems belonging to the natural capital is the result of the interaction between their own structural and functional parameters with external factors, among which one can identify those generated by projects for ecological reconstruction. Starting from this conclusion, one can compare the parameters before and after applying t...

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...

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...

The multi-parametric quality index (ICPM) is a dimensionless number used to evaluate the overall water quality and it is a useful tool for policy makers and for the public. This study aims to introduce the ICPM algorithm. The ICPM was developed to assess the water quality of the Lower Danube River using information obtained from the analysis of 41...

The need of hydraulic structures for the improvement of the navigation conditions on the Danube, between Calarasi and Braila (km 375 and km 175), led to the development of studies regarding the environmental impact. The studies were made by correlating the dynamic implementation of hydraulic works with the results of the environmental monitoring, b...

The hydrotechnical works (bottom sills, banks protections, and guiding wall) performed during 2011-2017 period on the Danube river, between Calarasi and Braila (km 375-175), aimed to improve the fluvial navigation, and have imposed a continuous monitoring of biotic and abiotic environmental factors. The aim of these hydraulic works is to identify t...

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 presence of estrogens in the environment and their effects especially on reproductive health on aquatic animals and on humans has become a subject of growing concern worldwide. This paper describes the preliminary data and tests performed in order to obtain and optimize a new gas chromatographic method for the identification of the most common...

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...

Abstract. Zooplankton plays a very important and diverse roles in natural ecosystems and is a very efficient indicator of water quality by its qualitative (diversity) and quantitative (e.g. abundance) responses to nutrient, organic matter, pesticides and heavy metal pollution, making the research of zooplankton characteristics very useful for water...

In the last decades, sturgeon species population decreased due to several factors, the most important ones being: habitats fragmentation caused by river bed rehabilitation works, irrational and excessive fishing and poaching phenomena which is extremely difficult to control. In order to gain a better understanding of sturgeon species migration on L...

Nowadays, the available information regarding sturgeon behaviour and their spawning and wintering migration routes on Lower Danube is limited. Moreover, the four existing sturgeon species are prone to extinction due to anthropic activities including over-exploitation, environmental pollution and hydromorphological changes, therefore, the necessity...

Purpose We analysed the status of current water and sediment management practices in six deltas and estuaries, which were part of the European DELTANET, INTERREG-funded network. Materials and methods These systems—the Danube, Ebro and Vistula deltas and the Elbe, Minho and Severn estuaries— represent different geographic regions of Europe. This ena...

The isotope record of the Danube River water at Vienna station probably is the longest dataset of a large river worldwide: 3H record since 1963, stable isotopes 2HH and 18O records since 1968. From the 2H-18O relation ("deuterium excess") can be concluded that the isotopic composition in the Danube River water reflects mainly the isotopic relations...

In 2011, zooplankton community structure was investigated in a set of 16 locations on the Danube river and shallow lakes in the Danube delta, between September 27 and October 04. Three partner countries were involved in the sampling programme: Romania (RO), Ukraine (UA), Moldova (MD); each country collected one sample following its own ‘national’ s...

In 2011, zooplankton community structure was investigated in a set of 16 locations on the Danube river and shallow lakes in the Danube delta, between September 27 and October 4. Three partner countries were involved in the sampling programme: Romania (RO), Ukraine (UA) and Moldova (MD); each country collected one sample following its own ‘nati...

In the last decades, sturgeon species population decreased due to several factors, the most important ones being: habitats fragmentation caused by river bed rehabilitation works, irrational and excessive fishing and poaching phenomena which is extremely difficult to control. In order to gain a better understanding of sturgeon species migration on L...

In 2011, zooplankton community structure was investigated in a set of 16 locations on the Danube river and shallow lakes in the Danube delta, between September 27 and October 4. Three partner countries were involved in the sampling programme: Romania (RO), Ukraine (UA) and Moldova (MD); each country collected one sample following its own ‘nati...

The isotopic composition of river water in the Danube Basin is mainly governed by the isotopic composition of precipitation in the catchment area, evaporation effects play only a minor role. Short-term and long-term isotope signals from precipitation are thus transmitted through the whole catchment. The isotopic composition of Danube water in the D...

This publication brings substantial evidence to the scientific knowledge on sturgeon migration, the information being essential for establishing the most efficient strategies for protecting this endangered species, being useful both for authorities and for scientific research.

The Danube - Black Sea Region contains the single most important non-oceanic body of water in Europe. Every year, about 350 cubic kilometers of river water pour from the Danube into the Black Sea from an area of 2 million square kilometer basin, covering about one third of the area of continental Europe. Over 160 million people live in this basin.