....για Λίμνες και άλλα σχετικά *******: - The Environmental State of Freshwater Resources...: https://www.academia.edu/keypass/cmc5cU52dWt1QkRyVjJhQXFlSDE1bStqZndSTlB2UDlGSkpxNm9BNVNOaz0tLXluQSsyZXNNOVJLWTQ2bW9FVWNkNHc9PQ==--051d82ea...

Βαθυμετρικά και Μορφολογικά στοιχεία των Ελληνικών Φυσικών Λιμνών.

ISSN: 2044-2041 (Print) 2044-205X (Online) Journal homepage: www.tandfonline.com/journals/tinw20

Bathymetry and morphometric analysis of Greek

natural lakes through a hybrid GIS-acoustic

methodology

Triantafyllia-Maria Perivolioti, Antonios Apostolakis, Dimitrios Papadimos &

Vasiliki Tsiaoussi

To cite this article: Triantafyllia-Maria Perivolioti, Antonios Apostolakis, Dimitrios Papadimos

& Vasiliki Tsiaoussi (2025) Bathymetry and morphometric analysis of Greek natural

lakes through a hybrid GIS-acoustic methodology, Inland Waters, 15:1, 2447173, DOI:

10.1080/20442041.2024.2447173

To link to this article: https://doi.org/10.1080/20442041.2024.2447173

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Eutrophication Monitoring for Lake Pamvotis, Greece, Using Sentinel-2 Data

Maria Peppa

Christos Vasilakos

and

Dimitris Kavroudakis

Department of Geography, University of the Aegean, 81100 Mytilene, Greece.

ISPRS Int. J. Geo-Inf. 2020, 9(3), 143; https://doi.org/10.3390/ijgi9030143

Submission received: 31 January 2020 / Revised: 24 February 2020 /Accepted: 27 February 2020 / Published: 29 February 2020

Abstract

The use of remote sensing to monitor inland waters and their current state is of high importance, as fresh waters are the habitat of many species of flora and fauna, and are also important for anthropogenic activities. Water quality can be monitored by many parameters, including dissolved suspended matter, phytoplankton, turbidity, and dissolved organic matter, while the concentration of chlorophyll-a (chl-a) is a representative indicator for detecting phytoplankton and monitoring water quality. The detection of phytoplankton in water layers, through chl-a indicators, is an effective method for displaying eutrophication. Numerous scientific publications and studies have shown that remote sensing data and techniques are capable of monitoring the temporal and spatial distribution and variation of this phenomenon. This study aimed to investigate the eutrophication in Pamvotis Lake, in Ioannina, Greece with the application of chl-a detection algorithms, by using Sentinel-2 satellite imagery data for the time period of 2016–2018. The maximum chlorophyll index (MCI) and maximum peak-height (MPH) algorithms have been applied to top of atmosphere (TOA) reflectance data, to detect chl-a and monitor the trophic range of the water body. Both algorithms were correlated and resulted in Pearson’s r values up to 0.95. Finally, the chl-a concentration was estimated by applying an empirical equation that correlates the MPH and chl-a concentration developed within previous studies. Those results were further analyzed and interpreted with spatial statistical methods, to understand the spatial distribution pattern of the eutrophication in our study area. Our results demonstrated that Pamvotis Lake is a eutrophic lake, and the highest chl-aconcentration was located in the east and south-east of the lake during the study period. Sentinel-2 data can be a useful tool for lake managers, in order to estimate the spatial distribution of the chl-aconcentration and identify areas prone to eutrophication, as well as the coastal zones that may influence the lake through water canals.

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Occurrence and diversity of cyanotoxins in Greek lakes

Scientific Reports volume 8, Article number: 17877 (2018) https://www.nature.com/articles/s41598-018-35428-x/metrics

details

Abstract

Toxic cyanobacteria occur in Greek surface water bodies. However, studies on the occurrence of cyanotoxins (CTs) are often limited to mainly microcystins (MCs), with use of screening methods, such as ELISA, that are not conclusive of the chemical structure of the CT variants and can be subject to false positive results. A multi-lake survey in Greece (14 lakes) was conducted in water and biomass, targeted to a wide range of multi-class CTs including MCs, nodularin-R (NOD), cylindrospermopsin (CYN), anatoxin-a (ANA-a) and saxitoxins (STXs), using multi-class/variant LC-MS/MS analytical workflows, achieving sensitive detection, definitive identification and accurate quantitation. A wide variety of CTs (CYN, ANA-a, STX, neoSTX, dmMC-RR, MC-RR, MC-YR, MC-HtyR, dm3MC-LR, MC-LR, MC-HilR, MC-WR, MC-LA, MC-LY, MC-LW and MC-LF), were detected, with MCs being the most commonly occurring. In biomass, MC-RR was the most abundant toxin, reaching 754 ng mg−1 dw, followed by MC-LR (458 ng mg−1 dw). CYN and ANA-a were detected for the first time in the biomass of Greek lakes at low concentrations and STXs in lakes Trichonis, Vistonis and Petron. The abundance and diversity of CTs were also evaluated in relation to recreational health risks, in a case study with a proven history of MCs (Lake Kastoria).

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Journal of Quaternary Science

Volume 40, Issue 3 pp. 459-480

Consilience in practice: social–ecological dynamics of the Lake Volvi region (Greece) during the last two millennia

Lucrezia Masci, Georgios C. Liakopoulos, Raphael Gromig, Elias Kolovos, Katerina Kouli, Matthias Moros, Laura Sadori, Alexander Sarantis, Philip Slavin, Jakub Sypiański, Georgios Vidras … See all authors

First published: 12 July 2024

https://doi.org/10.1002/jqs.3645

https://onlinelibrary.wiley.com/authored-by/Masci/Lucrezia

Abstract

The Lake Volvi area, part of the region of Macedonia (northern Greece), is a biodiversity hotspot, located in the central part of a major communication corridor connecting the western and eastern parts of the Balkans. The sediment succession from Lake Volvi is investigated here to provide a unique high-resolution pollen and geochemical record for the last 2000 years combining palaeoecological and historical methods, implementing the concept of consilience. The palaeoecological data document the environmental dynamics since the occupation of the area by the Romans. The vegetation changes reveal the development of wetland habitats and the variations of the mixed deciduous oak and thermophilous–mesophilous forests, as well as cereal cultivation, grazing and arboriculture, whose intensity varied over time. Archaeological data are available for the 1st millennium ce, but detailed historical evidence becomes accessible from the 13th century ce onwards through Byzantine and Ottoman documents. Both historical and palaeoecological data indicate that the 16th century was the period of strongest population pressure on the environment of the Volvi region. However, for other periods, it is possible to observe disagreements between the proxies. We demonstrate that these contradictions can be resolved with a more complex understanding of the region's social–ecological dynamics.

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Kastoria and Mikri Prespa Lakes: The Impact of Anthropogenic Activities on the Differentiation in the Genotoxic and Toxic Profile of the Surface Water

Ioanna Efthimiou

1,2,

Dimitris Vlastos

Vassilios Triantafyllidis

4,*

and

Maria Antonopoulou

1,*

Department of Sustainable Agriculture (Former Department of Environmental Engineering), University of Patras, Seferi 2, GR-30100 Agrinio, Greece

Institute of Marine Biology, Biotechnology and Aquaculture, Hellenic Centre for Marine Research (HCMR), GR-19013 Attiki, Greece

Department of Biology, University of Patras, GR-26500 Patras, Greece

Department of Food Science & Technology, University of Patras, Seferi 2, GR-30100 Agrinio, Greece

Authors to whom correspondence should be addressed.

Land 2023, 12(1), 119; https://doi.org/10.3390/land12010119

Published: 30 December 2022

https://www.mdpi.com/2073-445X/12/1/119

(This article belongs to the Special Issue Soil and Water Conservation on Degraded Land)

Abstract

Urban–industrial and agricultural waste can add significant amounts of pollutants to surface water. Therefore, the surface water from Mikri Prespa and Kastoria lakes was assessed for its toxic, genotoxic, and cytotoxic effects. Water samples were collected during the spring of two different years (S1 and S2) in order to investigate the anthropogenic effects on both lakes. Physicochemical parameters were identified, while significant elements were determined via ICP-MS/MS. The in vitro cytokinesis-block micronucleus (CBMN) assay in cultured human lymphocytes and the Aliivibrio fischeri bioassay were applied to evaluate the genotoxic–cytotoxic and toxic effects, respectively. In the CBMN assay, significant differences were observed in genotoxic and cytotoxic indices between the different time periods. Decreased indices in S2 could be correlated with a potential diminution in the negative human effect on the environment along the lakes. In the Aliivibrio fischeri bioassay, no significant difference in the toxicity of the surface water samples from Mikri Prespa was observed, whereas significant differences were identified in the samples from Lake Kastoria. The differences in toxic, genotoxic, and cytotoxic effects reveal the impact and the influence of anthropogenic activities in the areas of land around the lakes in relation to their surface water quality.

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Lakes host rich biodiversity and provide valuable ecosystem services, including water for human and economic use. However, knowledge of lake ecosystems in Greece was previously limited. This gap has been addressed by the substantial increase in data from the National Lake Monitoring Network, which has been operational since 2012. The EU Water Framework Directive (WFD) has set the guidelines for lake monitoring and assessment systems. In this chapter, we present the key characteristics, ecological status, and trends of 49 Greek lakes between 2016 and 2022, as assessed according to the WFD. Overall, 55% of the lakes were classified as having good or better ecological status/potential. Of the remaining lakes, 33% were rated as moderate, 10% were classified as poor, and only 2% were rated as having bad ecological status. Specifically, the majority of reservoirs (85%) were assessed as having good or above ecological potential, while only 22% of natural lakes were rated similarly. The majority of natural lakes were classified as having moderate (52%), poor (22%), or bad ecological status (4%). Monitoring activities have played a crucial role in improving our understanding of the structure and functioning of lake ecosystems across different spatial and temporal scales. Additionally, the national monitoring network has created a valuable time series of data documenting the status and trends of Greek lakes, available to all interested parties. Authorities and other stakeholders can use these data to prioritize relevant conservation and restoration measures and assess their effectiveness.

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....για Λίμνες και άλλα σχετικά *******: - The Environmental State of Freshwater Resources...

Eutrophication Monitoring for Lake Pamvotis, Greece, Using Sentinel-2 Data

Occurrence and diversity of cyanotoxins in Greek lakes

Abstract

Consilience in practice: social–ecological dynamics of the Lake Volvi region (Greece) during the last two millennia

Kastoria and Mikri Prespa Lakes: The Impact of Anthropogenic Activities on the Differentiation in the Genotoxic and Toxic Profile of the Surface Water

Future Perspectives: Results from WFD Monitoring

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