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Spatio-temporal changes of littoral macrophytes along hydrological conditions in Yliki, a Greek lake
(2025-11-24)
E. Mavromati
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V. Giourieva
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D. Papadimos
;
A. Apostolakis
;
V. Tsiaoussi
Human-induced changes in hydrological conditions seem to be among the main factors affecting ecological relationships in lakes (Zhao et al., 2021). Water level fluctuation (WLF), which is often attributed to anthropogenic activities and its amplitude variations can have an impact on aquatic plant communities by altering several key environmental factors (Hill et al., 1998, Zhao et al., 2021). These fluctuations influence water depth, underwater irradiance, water quality, and dissolved oxygen levels, all of which play crucial roles in the growth and survival of macrophytes (Li et al., 2017). The interplay of these factors can significantly change the growing conditions for several macrophyte species over time. To overcome this, macrophytes have evolved to adjust gradually to periodic WLF over time, as part of their long-term evolutionary process (Zhao et al., 2021). The aims of the study are to present the results of WLF over time in Lake Yliki, study its aquatic plant community and explore the effect of WLFs on macrophytes.
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Spatio-temporal changes of littoral macrophytes along hydrological conditions in Yliki, a Greek lake (Presentation)
(2025-11-18)
E. Mavromati
;
V. Giourieva
;
D. Papadimos
;
A. Apostolakis
;
V. Tsiaoussi
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Bathymetry and morphometric analysis of Greek natural lakes through a hybrid GIS-acoustic methodology
(2025-04-03)
T. Perivolioti
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A. Apostolakis
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D. Papadimos
;
V. Tsiaoussi
Homogeneous and up-to-date bathymetric information on lakes is essential to improve limnological knowledge and produce evidence-based lake monitoring, assessment methods, and river basin management plans according to Water Framework Directive (WFD). The present study focused on the production of updated bathymetric information on the main natural Greek lakes and their morphometric analysis. The aim was to address the knowledge gap by providing updated homogeneous and accurate bathymetric information for the main freshwater natural lakes of Greece as part of the National Monitoring Network of Lakes in the context of WFD. We surveyed 14 freshwater lakes in mainland Greece using a dual frequency echosounder. Using the acoustic data collected during the surveys, bathymetric digital terrain models (DTMs) were produced for each lake and used to estimate morphometric characteristics (mean/ maximum depth, volume, lake depth ratio, volume development, mean lake diameter, relative depth ratio, shoreline development factor, hypsographic curve). This analysis demonstrated the potential of the morphometric approach to generate valuable information using up-to-date bathymetric DTMs. The geospatial data derived by the present study are available through an online repository, the Greek National Monitoring Network of Lakes (http://ekbygis.biodiversity-info.gr/geoserver/web/). These data provide a valuable database for the advancement of limnological knowledge, the implementation of comprehensive monitoring programmes, and informed decision making in water resources management.
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A Geographic Object-Based Image Approach Based on the Sentinel-2 Multispectral Instrument for Lake Aquatic Vegetation Mapping: A Complementary Tool to In Situ Monitoring
(2024-03-05)
M. Tompoulidou
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E. Karadimou
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A. Apostolakis
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V. Tsiaoussi
Aquatic vegetation is an essential component of lake ecosystems, used as a biological indicator for in situ monitoring within the Water Framework Directive. We developed a hierarchical object-based image classification model with multi-seasonal Sentinel-2 imagery and suitable spectral indices in order to map the aquatic vegetation in a Mediterranean oligotrophic/mesotrophic deep lake; we then applied the model to another lake with similar abiotic and biotic characteristics. Field data from a survey of aquatic macrophytes, undertaken on the same dates as EO data, were used within the accuracy assessment. The aquatic vegetation was discerned into three classes: emergent, floating, and submerged aquatic vegetation. Geographic object-based image analysis (GEOBIA) proved to be effective in discriminating the three classes in both study areas. Results showed high effectiveness of the classification model in terms of overall accuracy, particularly for the emergent and floating classes. In the case of submerged aquatic vegetation, challenges in their classification prompted us to establish specific criteria for their accurate detection. Overall results showed that GEOBIA based on spectral indices was suitable for mapping aquatic vegetation in oligotrophic/mesotrophic deep lakes. EO data can contribute to large-scale coverage and high-frequency monitoring requirements, being a complementary tool to in situ monitoring.
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Water-related ecosystems' mapping and assessment based on remote sensing techniques and geospatial analysis: The SWOS national service case of the Greek Ramsar sites and their catchments
(2020-05-08)
E. Fitoka
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The National Park of National Park of Lakes Koronia, Volvi and Macedonian Tempe ...through a map
(Greek Biotope/Wetland Centre (EKBY), 2017-07-05)
K. Mpoli
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M. Katsakiori
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A. Apostolakis
;
L. Hatziiordanou
Εκπονήθηκε στο πλαίσιο του Έργου "Δράσεις περιβαλλοντικής ευαισθητοποίησης στην προστατευόμενη περιοχή των λιμνών Κορώνειας Βόλβης και Μακεδονικών Τεμπών"
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Ramsar wetlands in the Mediterranean wetlands Committee countries
(Ministry of Environment, Physical Planning and Public Works, 2014-04-29)
I. Dimitriadis
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A. Apostolakis
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E. Fitoka
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N. Kontos
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Crop pattern identification in Strymonas basin using satellite image analysis. Volume 2 (year 2005)
(Greek Biotope/Wetland Centre (EKBY), 2014-04-29)
A. Apostolakis
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Crop pattern identification in Strymonas basin using satellite image analysis. Volume 1 (year 2004)
(Greek Biotope/Wetland Centre (EKBY), 2014-04-29)
A. Apostolakis
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Υδρομετρικά στοιχεία σε 12 θέσεις ροής επιφανειακών νερών του Νομού Σερρών (Ιουλ. 2006 έως Ιαν. 2007). 1η και 2η Έκθεση
(Ελληνικό Κέντρο Βιοτόπων-Υγροτόπων (ΕΚΒΥ), 2014-04-29)
A. Apostolakis

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