At present, the characterization and monitoring of water bodies' ecological state is achieved with important financial resources supported by the EU member countries. Since human and financial resources are limited, the development of... more
At present, the characterization and monitoring of water bodies' ecological state is achieved with important financial resources supported by the EU member countries. Since human and financial resources are limited, the development of new mapping tools such as remote sensing ones may be a practical alternative for water bodies' assessment and monitoring, especially within Danube Delta, which has over 300 lakes, many of whom are difficult to access. The paper present the first results on developing a methodology to monitor Danube Delta lakes' trophic state by means of satellite image processing and field data on water depth, transparency and vegetation cover of floating and submerge aquatic vegetation (e. g. Nymphaea sp., Nuphar luteum, Trapa natans, Stratiodes aloides, Ceratophyllum demersum, Potamogeton sp., Chara sp.) It starts with the completion of the field database necessary to elaborate the methodology and then we have test a series of specific thematic algorithms for discrimination of aquatic vegetation types based on Sentinel 2 images. The next step will be integration of hydro morphological, chemical and biological data to run supervised classification of the satellite images in order to discriminate trophic status of different lakes.
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Eutrophication is a process characterized by an increase in the aquatic system productivity, which causes profound changes in the structure of its communities. Owing to the high environmental sensitivity of planktonic species, the study... more
Eutrophication is a process characterized by an increase in the aquatic system productivity, which causes profound changes in the structure of its communities. Owing to the high environmental sensitivity of planktonic species, the study of their communities can indicate the deterioration of the environment. Zaghen was the most clogged sector of the Danube meadow, North of Tulcea Hills, which included many fluvial levees, former riverbeds, reedbeds , swamps, lakes, and channels. Since the beginning of the century, the Zaghen area has been mentioned as a marsh not connected with the Danube, flooded only at high water levels, over the time has been affected by several forms of continuous human interference. Here we analyze some properties of the zooplankton community as bioindicators of eutrophication and water quality change. Water was collected for analysis and quantitative zooplankton samples were taken at four sites during June to December 2017. Species were identified and their numerical abundances and biomasses were determined and used to estimate some biological indices like Brachionus species diversity, the ratio large Cladocera to total numbers of Cladocera , the ratio of crustacean zooplankton biomass to phytoplankton biomass - chlorophyll "a", and the Calanoida/Cyclopoida ratio.
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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... more
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-geomorphological system and the local and regional topo-climates, which is a pronounced phenomenon in the conditions of global climate changes. All these alterations have led to a significant transformation of the ecosystems. Transforming these ecosystems of the Lower Danube floodplain into dry land ecosystems has reduced their ecological, recreational, aesthetic and educational functions to only one function: the economic one. The natural capital of the Lower Danube floodplain has a productive capacity that must be known by its functional cells in order to avoid degradation, destruction under anthropogenic impact and to favor the sustainable use o...
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The land monitoring data derived from satellite images for the 2006-2012 period provide information on land-cover changes in Romania. Availability and the quality of these data can contribute to new approaches of landscape assessment, for... more
The land monitoring data derived from satellite images for the 2006-2012 period provide information on land-cover changes in Romania. Availability and the quality of these data can contribute to new approaches of landscape assessment, for instance, in the context of environmental policies, the diversity of land use (patchiness) and surface as well, can show land dynamics in different regions, having in view that land cover reflects the biophysical state of the real landscape. In this paper, we present the results of the enhancement activity where we put an extra-work load aiming to have a more detailed thematic map that is missing in this country. These enhancements of the High-Resolution Layers (HRLs) products were derived from the service provider's products and in-situ data sets with a lot of manual editing. The products obtained are specifically for local-use and are different from those produced as part of contract obligation to the European Environmental Agency (EEA). HRLs...
This paper summarizes a review of plant resources within the Danube Delta. The material shows the areas of interest in terms of rational exploitation of plant species from the spontaneous, subspontaneous and cultivated flora. It is also a... more
This paper summarizes a review of plant resources within the Danube Delta. The material shows the areas of interest in terms of rational exploitation of plant species from the spontaneous, subspontaneous and cultivated flora. It is also a review of meliferrous and medicinal plant species of interest. An assessment was made over the pratological value of the investigated area.
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The paper is focused on the potato production in Peru, that is the Latin America's biggest potato producer, with a record harvest in 2007 of almost 3.39 million tones, followed by Brazil, Argentina, Colombia and Mexico. National... more
The paper is focused on the potato production in Peru, that is the Latin America's biggest potato producer, with a record harvest in 2007 of almost 3.39 million tones, followed by Brazil, Argentina, Colombia and Mexico. National potato production is enough for internal demand; the annual consumption in is about 80 kg per capita. The cultivated area in Peru is about 270000 ha, which is produced mainly by small farmers, at altitudes of from 2000 m to 4500 m in the Peruvian highlands. Today, in Peru, there are around 3000 cultivated varieties of potato, which include the eight species some of them are exclusive to the Andes. Unfortunately, potato biodiversity in Peru is vulnerable, partly due to the tradition of local knowledge being passed down through the generations by word-ofmouth, young people move to the cities, and also by abiotic and biotic threats. The study underlines the main constraints on potato productivity, but also the solutions the research activity may offer to su...
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In this paper, the authors report new data on chorology of various plant species in Romania, as: Chenopodium ambrosioides L., Panicum dichotomiflorum Michx., Paspalum paspalodes (Michx.) Scribn., Lupinus polyphyllus Lindl., Oenothera... more
In this paper, the authors report new data on chorology of various plant species in Romania, as: Chenopodium ambrosioides L., Panicum dichotomiflorum Michx., Paspalum paspalodes (Michx.) Scribn., Lupinus polyphyllus Lindl., Oenothera glazioviana Micheli, and so on. Corispermum canescens Schult., C. hyssopifolium L., and Rosa villosa subsp. villosa are confirmed in the flora of Romania, by herbarium material. All the collected specimens are deposited in the Herbarium of University of Agricultural Sciences and Veterinary Medicine „Ion Ionescu de la Brad”, Iaşi (IASI).
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This paper reveals new data concerning the distribution and the ecological characteristics of the Gymnospermium altaicum odessanum subspecies. It has been done an each site's description of the landscape, geology, soils and the main... more
This paper reveals new data concerning the distribution and the ecological characteristics of the Gymnospermium altaicum odessanum subspecies. It has been done an each site's description of the landscape, geology, soils and the main features of the soils such as the humus's provision, organic C and the pH's level. There are also graphically carried out the areas where the subspecies has been found, subspecies that has been proved to be rare and spread in Northern Dobogea only. There are presented both phenological and morphological data and about the floristic composition of the habitat ones. INTRODUCTION Gymnospermium altaicum, rare species, spread in Romania, in Dobrogea only, recently included in the association Gymnospermio (altaicae) – Celtetum (glabratae), association with a reduced spreading that has been so far identified in Măcin Mountains (Petrescu 2001, 2004a). The species' monitoring in the areas mentioned by the reference literature and its identifying i...
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bstract. On the coastal areas, the pressure of touristic development upon natural areas is increasing and interfering with main purposes of Natura 2000 sites designation. Therefore the habitats tendency, adequate for species development,... more
bstract. On the coastal areas, the pressure of touristic development upon natural areas is increasing and interfering with main purposes of Natura 2000 sites designation. Therefore the habitats tendency, adequate for species development, is in regression as far as areas size and homogeneity are concerned. In this respect, a case study is presented for the Black Sea’s north-western littoral, in Sulina locality, Romania. The present paper was elaborated in conformity with Ministry Order 19/2010 for the Methodological Guide with regard to the adequate evaluation (A.E.) of the effect of potential plans or projects on protected natural areas of community importance. The case study is an investment project called “Sulina beach arrangement”. Its objective was to develop a plot for the beach area’s tourist infrastructure in order to provide services to the public. The cumulative impact of the existing project may affect the coastal habitats (1210, 1310, 1410, 2110 and 2160) and Natura 2000 ...
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∗∗∗ ** ∗∗∗ , Key-words: Invasive Terrestrial Plant Species (ITPS), protected areas, FP7 enviroGRIDS project, Romania. The current paper is aiming to present some of the most significant scientific results developed in the framework of FP7... more
∗∗∗ ** ∗∗∗ , Key-words: Invasive Terrestrial Plant Species (ITPS), protected areas, FP7 enviroGRIDS project, Romania. The current paper is aiming to present some of the most significant scientific results developed in the framework of FP7 enviroGRIDS project – Building Capacity for a Black Sea Catchment Observation and Assessment supporting Sustainable Development, in terms of assessing the occurrence, development and spread the main Invasive Terrestrial Plant Species (ITPS) in the Romanian protected areas. Taking into consideration the intensification of the human-induced influences in various habitats, the authors undertook an in-depth analysis of selected ITPS (Amorpha fruticosa, Acer Negundo, Ailanthus altissima, Fallopia japonica, Impatiens glandulifera) in relation to the key environmental driving forces in some protected areas considered as case-studies for each biogeographical region in Romania: Maramures Mountains Natural Park (Alpine region), Mures Floodplain Natural Park ...
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The assessment of invasive terrestrial plant species in the Romanian protected areas is an important research direction, especially since the adventive species have become biological hazards with significant impacts on biodiversity. Due... more
The assessment of invasive terrestrial plant species in the Romanian protected areas is an important research direction, especially since the adventive species have become biological hazards with significant impacts on biodiversity. Due to limited resources being available for the control of the invasive plants, the modelling of the spatial potential distribution is particularly useful in order to find the best measures to eliminate them or prevent their introduction and spread, as well as including them in the management plans of protected areas. Thus, the present paper aims to assess one of the most disturbing invasive terrestrial plant species in Europe – A.fruticosa in one of the most important natural protected area in Romania, i.e. Mureş Floodplain Natural Park (V IUCN category and RAMSAR –Wetlands of International Importance). The current study is a geographical approach seeking to explain the spatial relationships between this invasive species and several explanatory factors...
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In wetland environments, vegetation has an important role in ecological functioning. The main goal of this work was to identify an optimal combination of Sentinel-1 (S1), Sentinel-2 (S2), and Pleiades data using ground-reference data to... more
In wetland environments, vegetation has an important role in ecological functioning. The main goal of this work was to identify an optimal combination of Sentinel-1 (S1), Sentinel-2 (S2), and Pleiades data using ground-reference data to accurately map wetland macrophytes in the Danube Delta. We tested several combinations of optical and Synthetic Aperture Radar (SAR) data rigorously at two levels. First, in order to reduce the confusion between reed (Phragmites australis (Cav.) Trin. ex Steud.) and other macrophyte communities, a time series analysis of S1 data was performed. The potential of S1 for detection of compact reed on plaur, compact reed on plaur/reed cut, open reed on plaur, pure reed, and reed on salinized soil was evaluated through time series of backscatter coefficient and coherence ratio images, calculated mainly according to the phenology of the reed. The analysis of backscattering coefficients allowed separation of reed classes that strongly overlapped. The coherenc...
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The authors wish to make the following corrections to this paper [...]
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... Mihai Doroftei✉, Marian Mierla ... (12) P. Anastasiu, G. Negrean, C. Başnou, C. Sîrbu, A. Oprea, A preliminary study on the neophytes of wetlands in Romania, Rabitsch, W., F. Essl & F. Klingenstein (Eds.): Biological Invasions –... more
... Mihai Doroftei✉, Marian Mierla ... (12) P. Anastasiu, G. Negrean, C. Başnou, C. Sîrbu, A. Oprea, A preliminary study on the neophytes of wetlands in Romania, Rabitsch, W., F. Essl & F. Klingenstein (Eds.): Biological Invasions – from Ecology to Conservation. ...
The present checklist is a synthesis based on the field investigation results concerning the alien ligneous plants from D.D.B.R. Bibliographic studies that refer to Danube Delta area was also consulted in order to elaborate this... more
The present checklist is a synthesis based on the field investigation results concerning the alien ligneous plants from D.D.B.R. Bibliographic studies that refer to Danube Delta area was also consulted in order to elaborate this preliminary list. In order to realize this inventory, it was necessary to establish the synonyms and to up-date the nomenclature. This list includes 64 alien ligneous plants that occur in D.D.B.R. according to our observations. In the preparation of the floristic checklist, we developed a picture data base in order to sustain the data presented in this paper.
ABSTRACT Observed for the first time in south-eastern Romania by Ramme in 1951 and described as a new subspecies from Cogealac (Constanţa County), Asiotmethis limbatus motasi (Ramme, 1951) is endemic for the Romanian territory, being... more
ABSTRACT Observed for the first time in south-eastern Romania by Ramme in 1951 and described as a new subspecies from Cogealac (Constanţa County), Asiotmethis limbatus motasi (Ramme, 1951) is endemic for the Romanian territory, being known only from central and southern Dobrogea. The species was discovered in – situ by its calling song and body colour, two major elements in identifying this very mobile insect. There are three major NATURA 2000 habitat types where this taxa have been identified: Subpannonic steppe grasslands described as xerophilous feathergrass steppe grasslands, dry grasslands described as hill and plateau xero-mesophilous grassland, and limestone few fallow steppe grasslands from Dobrogea described as steppe grassland on hill limestone, with an average altitude oscillating between 100 and 150 meters a.s.l. Keywords: Asiotmethis limbatus, Orthoptera, Romania, distribution, specific habitats.
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... been reported as a sub-spontaneous species in the wild in several localities, as: Hupca - Vaslui county [66] and Letea (Danube Delta ... sub-spontaneous plant it has been cited from various localities, as: Urecheşti - Vrancea county... more
... been reported as a sub-spontaneous species in the wild in several localities, as: Hupca - Vaslui county [66] and Letea (Danube Delta ... sub-spontaneous plant it has been cited from various localities, as: Urecheşti - Vrancea county [66], Iaşi (Nicolina, CUG and Mircea cel Bătrân ...