Ion Navodaru

Ion Navodaru
Danube Delta National Institute for Research and Development (DDNIRD)

Dr.

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47
Publications
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Publications

Publications (47)
Article
Full-text available
Abstract: This paper will present the results of research conducted in 2020 in Danube Delta Biosphere Reserve regarding the mapping of DDBR habitats in the Romanian classification system, assessment of the sustainable exploitation of plant resources, conservation status of invertebrate species of community interest, assessment of the ecological sta...
Article
Full-text available
The aim of this study was to determine the ecological status of fish fauna of Razim Lake under the conditions of the water salinity changing from brackish, almost 70 years ago, into freshwater nowadays. The natural processes of siltation and organic deposits, characteristic of Danube Delta lake complexes, intensified in the last decades and include...
Article
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The threat posed by invasive non-native species worldwide requires a global approach to identify which introduced species are likely to pose an elevated risk of impact to native species and ecosystems. To inform policy, stakeholders and management decisions on global threats to aquatic ecosystems, 195 assessors representing 120 risk assessment area...
Article
Environmental changes due to non-native species introductions and translocations are a global concern. Whilst understanding the causes of bioinvasions is important, there is need for decision-support tools that facilitate effective communication of the potential risks of invasive non-native species to stakeholders. Decision-support tools have been...
Article
Full-text available
Environmental changes due to non-native species introductions and translocations are a global concern. Whilst understanding the causes of bioinvasions is important, there is need for decision-support tools that facilitate effective communication of the potential risks of invasive non-native species to stakeholders. Decision-support tools have been...
Article
Full-text available
After first records of this species in Romanian waters in 2001 (Suceava river) and then in 2006 in Danube River (km 929), anticipated the presence of species in Danube Delta (DD), which happened in 2007 by two possible ways: upper Danube River or via Moldavian rivers from Ukraine. This paper analyses a decade of the evolution of the non-native Chin...
Article
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The genus Alosa is present only in the northern hemisphere of the earth with four species living in North America and others five in Europe, from which Pontic shad (Alosa immaculata) is subject of present study. Migration of shad depends of the environmental drivers such as increasing spring water temperature and river flooding. In 2016, both facto...
Article
The relationship between the Lower Danube River level and Romanian annual catches of Pontic shad (Alosa immaculata, Bennett 1835) were analyzed. For analysis of long term data on the Danube River water level and Pontic shad catch, combinations of different methods were applied using statistical programs, SPSS 13.0 and MATLAB 6. Periodograms, contai...
Article
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In the last century, water flow distribution varied in the Danube River and its arms due to its continuous correction and dredging. In the Lower Danube River, 77 fish species are currently recorded. In the Danube Delta arms and the adjacent running waters from the Danube Delta Biosphere Reserve (DDBR), 66 species are recorded, 2/3 of them of commer...
Article
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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...
Article
Data relating to the catch of Pontic shad in the Lower Danube Region for the period 1920-2008 were used to make a one-component and two-component model. The catch model for Pontic shad shows natural cyclic fluctuations with no sign of population decrease. The oscillation periods were 11.17 years and 9.56 years, which corresponds to solar activity c...
Article
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The protection, preservation and restoration of aquatic ecosystems and their functions are of global importance. For European states it became legally binding mainly through the EU-Water Framework Directive (WFD). In order to assess the ecological status of a given water body, aquatic biodiversity data are obtained and compared to a reference water...
Article
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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...
Article
Data on the catch of Pontic shad in the Lower Danube River Region for the period 1920-2008 were used to make one-component and two-component models. The catch model for Pontic shad showed natural cyclic fluctuations with no sign of population decrease. The oscillation periods were 11.17 years and 9.56 years, which corresponded to solar activity cyc...
Article
Full-text available
A description of biological and ecological data of the Danube delta lakes and channels is presented. The biological indicators refer to aquatic macrophytes, fish, zoo-plankton, and macro-invertebrates. Environmental data include physio-chemical data as well as hydrological parameters.
Article
Full-text available
A description of biological and ecological data of the Danube delta lakes and channels is presented. The biological indicators refer to aquatic macrophytes, fish, zoo-plankton, and macro-invertebrates. Environmental data include physio-chemical data as well as hydrological parameters.
Article
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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...
Article
This chapter draws on results from previous chapters, in some cases creating new syntheses by combining information across chapters and including findings of previous projects. Its specific objective is to consolidate all these findings in the design of a system to support transaction of information for environmental assessments and decision suppor...
Article
School children in the 541 km2 Commune of Sfântu Gheorghe, part of a Biosphere Reserve in the Danube Delta, mapped vegetation areas containing two wild plants. The plants were potential natural resources for raising income from tourists, to offset declining access to wild resources in the strongly protected area.
Chapter
The Danube River is 2,857 km long and navigable along the major part of its flow (2,411 km). Human activities have started to influence Danube River flow more significantly since the sixteenth century, through the flood prevention, navigation and hydropower plant construction activities. Two largest dams in the Danube, located at 943 river km (“Iro...
Article
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Conservation scientists, national governments, and international conservation groups seek to devise, and implement, governance strategies that mitigate human impact on the environment. However, few studies to date have systematically investigated the performance of different systems of governance in achieving successful conservation outcomes. Here,...
Article
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ABSTRACT. The investigation aimed to find out local knowledge on biodiversity conservation through sustainable use and the willingness of the local community Sfântu Gheorghe, Danube Delta, to be involved in the decision making process regarding the sustainable use of the natural resources. In obtaining the necessary information, structured intervie...
Article
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ABSTRACT. Ichthyofauna from Matita-Merhei and Rosu-Puiu lake-complexes was studied in 2008, using two complementary methods of sampling: electric fishing for shallow border zone and gillnet fishing for deep open water. The paper presents the actual status of the fish communities for two lake-complex from Danube Delta (Romania). In Matita-Merhei lak...
Article
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Specimens of Pontic shad (Alosa pontica Eichwald, 1838) were collected during April and May of 2006 in the Danube River (rkm 863) just downstream of the Iron Gate (Djerdap) II dam. Twenty-eight scales and 30 vertebrae were prepared and given to five interpreters with fish aging experience of from 3 to 30 years and with shad aging experience of from...
Article
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There are over 300 lakes interconnected by riverbranches and man-made canals in the Danube Delta (Romania). A multidisciplinary survey of these riverine lakes situated in large wetland complexes was made comprising hydrological modelling, remote sensing and monitoring of water quality, plankton, aquatic vegetation and fish communities. Between-lake...
Article
In the last forty years, the total fish catches of the Danube Delta have declined from some 12 000 tonnes/year to less than 4000 tonnes/year, while high-valued species like sturgeons, pike and tench almost completely disappeared from the catches. These changes were caused by structural alterations of the floodplain-river-delta complex (physical bar...
Article
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Long term fish catch statistics indicate that the commercial catch in the Danube delta (Romania) has declined about three-fold in the last half of 20th century. The fish community changed dramatically due to habitat loss, hydromorphological changes and pollution (nutrients, microcontaminants). To reverse this anthropogenic impact, several ecologica...
Article
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REZUMAT Studiul face o revizuire asupra peştilor şi păsărilor din Delta Dunării, concentrându-se asupra interacţiunii dintre păsări şi peşti. Delta Dunării, una din cele mi întinse zone umede (580.00 ha) din Europa, a fost declarată Rezervaţie a Biosferei in 1990. În ultima jumătate a secolului XX, ambele grupe, atât peştii cât şi păsările au cunos...
Article
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Three species belonging to Alosa are known in the northwestern part of the Black Sea, including the Sea of Azov: Pontic shad A. pontica (Eichwald, 1838), Caspian shad A. caspia (Eichwald, 1838), and Black Sea shad A. maeotica (Grimm, 1901). Regional populations, and possibly subspecies, occur in the Danube, Dniester, Dnieper, and Don rivers. Pontic...
Article
Man-made changes to the Danube delta include the improvement of the hydrological infrastructure for navigation and fish production purposes and an elevated nutrient load in the inflowing Danube river water. Records from the commercial fishery over the last 40 years indicate a shift from clear water fish (Tinca tinca, Carassius carassius, and Esox l...
Article
Man-made changes to the Danube delta include the improvement of the hydrological infrastructure for navigation and fish production purposes and an elevated nutrient load in the inflowing Danube river water. Records from the commercial fishery over the last 40 years indicate a shift from clear water fish (Tinca tinca, Carassius carassius, and Esox l...
Article
The Danube Delta was designated a Biosphere Reserve in 1990. Subsequently the sustainable use of the fish stocks within the reserve became a challenge for management. The fisheries exploit a variety of habitats distributed over about 580 000 ha of wetland. They yield between 5000 and 10 000 t year–1, equivalent in value to 6.3 million US$, making t...
Article
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The Pontic shad lives in the northwestern part of the Black Sea. It migrates in the Danube River for spawning. The larvae drift passively towards the sea when they reach the life stage ranging from pre-larvae to post-larvae. During the larval stage the Pontic shad is floating, mainly in the 0-50 cm upper layer of river. Upstream of the Danube Delta...
Book
Full-text available
This report is the result of a scientific co-operation between the DDNI Danube Delta National Institute (Tulcea, Romania) and the RIZA Institute for Inland Water Management and Waste Water Treatment (Lelystad, the Netherlands). The Dutch and Romanian ecologists in these institutes share a common concern with the ecology of temperate wetlands. The c...
Article
Full-text available
The requirement for fish stock conservation became law in 1991 at the same time of the declaration of the Danube Delta as a Biosphere Reserve. Conservation of biodiversity is the major objective of the reserve, with sustainable use of fish stocks introduced as the target objective in the fisheries. The present threat is over‐fishing by more fisherm...
Article
Full-text available
The Danube Delta Biosphere Reserve includes 200000 ha inland water areas, which produce an important fish resources, the total catches use varies between 4000-8000 tons per year. The implementation of sustainable use strategy as a part of fisheries management means the knowledge of the population status and simulation of intermediate and long term...
Article
Full-text available
The Razim Lake is a great part of the Danube Delta Biosphere Reserve, with a surface of 54 000 ha. In the last 10 years, the total catch varied from 1455 to 2100 tons/year, whereas pikeperch catches were 83 - 432 tons/year. Due to very high fishing intensity, the stock loses yearly 85-90 % of the mean number, the most being 2 and 3 year old. The re...
Article
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As a result of studies carried out in 1992 the average of absolute prolificity has been established, as follow: -for giebel carp of 4 years old and 20,3 cm body length, fished in lakes like Puiu, Matita, Trei Iezere, Lumina and Somova (Danube Delta Romania), the average absolute prolificity was 72 070 eggs number; - for roach of 4 years old (17,1 c...

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Projects

Projects (5)
Project
TIMMOD project unites the efforts of 6 partners from 5 Black Sea countries in a multisectoral & multidisciplinary project-consortium: TIMMOD Innovation Network, sharing the common understanding that Technological Upgrade is the key to “improve joint environmental monitoring”. TIMMOD group includes research organisations, state environmental agency, research & innovation association, regional environmental agency – a group that can exploit their complementarities to boost technology innovation in Black Sea water monitoring sector. BSB CBC programme is the appropriate platform to accelerate the technological upgrade that is not otherwise possible by a single effort of a single country or a single sector. Promoting Innovation aims to utilize new tools, approaches and technology to assist implementation of EU policies and programmes. The overall project objective is: To improve joint environmental monitoring and modelling, by facilitating Technology Innovation, to improve the availability and quality of data, the cooperation in sharing of data for water quality, biodiversity statistics, assessment of fish and non-fish living resources of the Black Sea - in line with the EU’s Marine Strategy Framework Directive (MSFD), Data Collection Framework (DCF), Blue Growth Strategy, Black Sea Convention on Environmental Protection and other EU and regional policies and conventions. Specific objectives (SO) are: 1) Achieve enhanced capacity of project partner organisations (and other stakeholders), to provide, use, and share, reliable and compatible environmental data for water quality parameters, fish and non-fish living resources 2) Achieve better cooperation, improved environmental data-sharing between Black Sea partners, by creation of a set of ICT shared tools 3) Put on the agenda an Innovation Strategy, designed to bring together (national, regional, EU) regulations and permits, combined with new monitoring and information technology, expanded transparency, and innovative enforcement. SO1 will be achieved by elaboration of a detailed inventory on technology innovation (incl. future and emerging technologies), and review on best practices, tested and demonstrated in Pilot Demonstration Projects (in the sea space near Bulgaria and Georgia). SO2 will be achieved by comprehensive analysis on various ICT tools for data handling and numerical modelling of marine environment, including high-level implementation of ocean-current modelling, and development of web-based data tools, integrated in a pilot demonstration Monitoring and Modelling Data Sharing Platform (MMDSP). SO3 Innovation Strategy is intended to scale-up the project results in all Black Sea area for years ahead - in line with the rapid technological growth – this way to secure sustainability of project results for “improving joint environmental monitoring”. www.timmod.org.
Project
The overall project objective is: To improve joint environmental monitoring and modeling, by facilitating Technology Innovation, to improve the availability and quality of data, the cooperation in sharing of data for water quality, biodiversity statistics, assessment of fish and non-fish living resources of the Black Sea - in line with the EU’s Marine Strategy Framework Directive, Data Collection Framework, Blue Growth Strategy, Black Sea Convention on Environmental Protection and other EU and regional policies and conventions.
Project
http://www.interreg-danube.eu/green-danube http://www.interreg-danube.eu/news-and-events/project-news/542.