Introduction of the Danube Delta Database

Hanganu, Jenică; Navodaru, I.; Tudor, Iuliana Mihaela; Ibram, Orhan; Doroftei, Mihai; A, Năstase

doi:10.15504/fmj.2015.8

Cited by 2 publications

(4 citation statements)

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“…There are strong differences in vegetation dominance between these lakes. These are the main controlling factors that play an important role in the distribution of aquatic macrophytes that influence the trophic gradient recognizing that most of the floodplain lakes are to some extent connected with a river [40,42,43]. In our data, we distinguished three type of lakes: (1) lakes with the highest connectivity dominated by Potamogeton trichoides Cham.…”

Section: Aquatic Macrophyte Vegetationmentioning

confidence: 96%

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Synergy of High-Resolution Radar and Optical Images Satellite for Identification and Mapping of Wetland Macrophytes on the Danube Delta

Niculescu

Boissonnat

Lardeux³

et al. 2020

Remote Sensing

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In wetland environments, vegetation has an important role in ecological functioning. The main goal of this work is 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 coherence coefficient showed that C-band SAR repeat pass interferometric coherence for cut reed detection is feasible. In the second section, random forest (RF) classification was applied to the S2, Pleiades, and S1 data and in situ observations to discriminate and map reed against other aquatic macrophytes (submerged aquatic vegetation (SAV), emergent macrophytes, some floating broad-leaved and floating vegetation of delta lakes). In addition, different optical indices were included in the RF. A total of 67 classification models were made in several sensor combinations with two series of validation samples (with the reed and without reed) using both a simple and more detailed classification schema. The results showed that reed is completely discriminable compared to other macrophytes communities with all sensor combinations. In all combinations, the model-based producer’s accuracy (PA) and user’s accuracy (UA) for reed with both nomenclatures were over 90%. The diverse combinations of sensors were valuable for improving the overall classification accuracy of all of the communities of aquatic macrophytes except Myriophyllum spicatum L.

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Section: Aquatic Macrophyte Vegetationmentioning

confidence: 96%

“…For each species, the percentage of cover was estimated using a 5-point scale according to Kohler, A. [43].…”

Section: Ground Reference Data Collectionmentioning

confidence: 99%

Synergy of High-Resolution Radar and Optical Images Satellite for Identification and Mapping of Wetland Macrophytes on the Danube Delta

Niculescu

Boissonnat

Lardeux³

et al. 2020

Remote Sensing

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“…It is a marginal inland sea of the Mediterranean, lying between Europe and Asia, filled with salty water, and supplied with freshwater by the Danube, Dnieper, and Don rivers [95][96][97][98][99][100][101][102][103]. The Bosporus, Dardanelles, and Gibraltar straits connecting the Black Sea to the Mediterranean Sea, Atlantic Ocean, and the World Ocean give these water bodies permanent connection and interdependency [104][105][106][107][108][109][110][111][112].…”

Section: Black Sea Level Fluctuation Elements: Dynamic History and Fu...mentioning

confidence: 99%

“…As a biosphere reserve, this wetland is also the largest protected zone (5800 km 2 ) and one of the key natural/semi-natural areas in Europe. One of Europe's youngest and most complex mixtures of water and land, this delta is a fluvial-maritime floodplain of the lower Danube, where its diverse geomorphology, soils, and hydrological conditions favor the proliferation of a large number of aquatic, semi-aquatic, and terrestrial habitats and biocoenoses [104,108,112].…”

Section: Danube Delta Habitats' Historical Exposure and Potential Tre...mentioning

confidence: 99%

The Danube Delta: The Achilles Heel of Danube River–Danube Delta–Black Sea Region Fish Diversity under a Black Sea Impact Scenario Due to Sea Level Rise—A Prospective Review

Bănăduc

Afanasyev

Akeroyd³

et al. 2023

Fishes

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The Danube Delta is one of Earth’s biodiversity hotspots and includes many endemic, rare, and important species of both major conservation and economic value. This unique complex of ecosystems also plays a key role for Danube River and Black Sea fish fauna through its role as a natural safe buffer, shelter, feeding, reproduction, and smooth transitional area for a large number of fish species. Climate change is inducing a progressive sea level rise in the Black Sea, a fact that is expected to impact the delta’s key complex and dynamic habitats, biocoenoses, and associated biota, and last but not least the key taxonomic group, namely, fish. Around one-third of the fish species of this delta will be greatly affected, sometimes negatively, by this climate change scenario, another one-third to a lesser extent, and the final one-third not at all. The ecological positive feedback of fish can stimulate environmental change and is expected to be responsible for changes within Danube Delta ecosystems, and also for the near Danube River and Black Sea diverse matrix of aquatic and semi-aquatic ecosystems. Sea level rise in the Black Sea is considered to have been one of the main stress factors of the Danube Delta fish fauna in the past, and is likely to be the case in the future. In this spatio-temporal dynamic context, for the fish species under threat and risk, in situ-adapted management measures are highly required. The current work brings for the first time such a prospective knowledge about the potential impact on Danube River–Danube Delta–Black Sea coast fish diversity in the potential climate change–sea level rise scenario.

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Introduction of the Danube Delta Database

Cited by 2 publications

References 0 publications

Synergy of High-Resolution Radar and Optical Images Satellite for Identification and Mapping of Wetland Macrophytes on the Danube Delta

Synergy of High-Resolution Radar and Optical Images Satellite for Identification and Mapping of Wetland Macrophytes on the Danube Delta

The Danube Delta: The Achilles Heel of Danube River–Danube Delta–Black Sea Region Fish Diversity under a Black Sea Impact Scenario Due to Sea Level Rise—A Prospective Review

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