@conference{nokey,

title = {Μελέτη των Characeae σε δύο ολιγότροφες λίμνες: αποτελέσματα του Εθνικού Δικτύου Παρακολούθησης λιμνών},

author = {Β. Γιουρίεβα and Ε. Μαυρομάτη and Β. Τσιαούση},

url = {http://hdl.handle.net/11340/2139},

year  = {2025},

date = {2025-10-01},

urldate = {2025-10-01},

booktitle = {Αναρτημένη ανακοίνωση στο 12ο Συνέδριο Ελληνικής Οικολογικής Εταιρείας, Αθήνα, 1-4 Οκτωβρίου 2025},

abstract = {Τα χαρόφυτα (οικογένεια Characeae) συνιστούν μια ομάδα μακροσκοπικών, βενθικών φυκών των εσωτερικών υδάτων1. Απαντούν κυρίως σε ολιγότροφα υδάτινα οικοσυστήματα, όπου σχηματίζουν εκτεταμένες φυτοκοινωνίες. Συνιστούν βιοδείκτη καλής οικολογικής κατάστασης των λιμνών2. Στην παρούσα εργασία παρουσιάζονται τα αποτελέσματα της παρακολούθησης των χαροφύτων σε δύο ολιγότροφες λίμνες, την Λίμνη Κουρνά και την Τεχνητή Λίμνη Φενεού και διερευνώνται οι χρονικές μεταβολές της ταξινομικής τους σύνθεσης και αφθονίας καθώς και η συσχέτισή τους με φυσικοχημικές παραμέτρους. Οι δειγματοληψίες των υδρόβιων μακροφύτων (belt transect method) πραγματοποιήθηκαν τέσσερις φορές σε κάθε λίμνη στο χρονικό διάστημα 2014-2024, κατά τη βλαστητική περίοδο. Συνολικά, καταγράφηκαν εννέα taxa χαροφύτων στις δύο λίμνες. Στην Κουρνά καταγράφηκαν τέσσερα taxa χαροφύτων με το Chara corfuensis να εμφανίζει τη μεγαλύτερη σχετική κάλυψη (το 2020 με 21.48%). Στον Φενεό, καταγράφηκαν επτά taxa, με το Chara globularis να έχει τη μεγαλύτερη σχετική κάλυψη (το 2017 με 43.19%). Η μέγιστη σχετική κάλυψη χαροφύτων καταγράφηκε στην Κουρνά το 2020 και στον Φενεό το 2014 (38.08% και 77.80% αντιστοίχως). Το μέγιστο βάθος αποίκισης χαροφύτων καταγράφηκε στα 16 μέτρα στην Κουρνά (2020) και στα 15 μέτρα στον Φενεό (2017). Με βάση τα αποτελέσματα πολυμεταβλητής ανάλυσης πλεονασμού (RDA) φαίνεται πως οι φυσικοχημικές συνθήκες επηρεάζουν τις βιοκοινότητες των χαροφύτων. Η συστηματική παρακολούθηση των χαροφύτων αναμένεται να συμβάλει στη βελτίωση της κατανόησης των οικολογικών απαιτήσεών τους και στη διατήρηση των λιμναίων οικοσυστημάτων στα οποία εντοπίζονται.},

keywords = {Characeae, Λίμνες, Μακρόφυτα},

pubstate = {published},

tppubtype = {conference}

}

@conference{nokey,

title = {Application of a 2D-Hydrodynamic Model to Assess the Impact of Spring Water Discharge into the Lake Pamvotida in Ioannina, Greece},

author = {K. Zachopoulos and D. Papadimos},

url = {http://hdl.handle.net/11340/2146},

year  = {2025},

date = {2025-06-24},

urldate = {2025-06-24},

booktitle = {p. 645-646 In: Proceedings of the 13th World Congress of EWRA on Water Resources and Environment, Palermo, Italy 24 - 28 June 2025},

pages = {645-646},

abstract = {According to the study conducted by the Greek Biotope Wetland Centre for the assessment of the minimum water level requirements of Lake Pamvotida, its water level (WL) should be maintained within the specified range of 469.10 - 468.20 m, a.m.s.l. However, the lake is very susceptible to larger reductions in its WL in late summer (below the proposed water level of 468.20 m) due to increased evaporation and over-pumping for irrigation purposes. This study investigates the introduction of freshwater from the Sentenikos and Kalithea Springs into Lake Pamvotida in order to mitigate the decrease in its water level (WL), during the dry season. A 2-D hydrodynamic modelling system was used to evaluate the effects of three scenarios in which the existence and location of the spring discharge inflow are differentiated. WL, temperature (T), dissolved oxygen (DO) and biochemical oxygen demand (BOD) were used for the evaluation of the effect of the scenarios on the lake’s condition. The research showed a significant change on the WL fluctuation of the lake, and only minor effects locally dispersed regarding on its temperature, DO and BOD.},

keywords = {Λίμνες, Υδρομορφολογική ανάλυση},

pubstate = {published},

tppubtype = {conference}

}

@conference{nokey,

title = {Έλεγχος της απόκρισης των βιολογικών κοινοτήτων σε σχέση με τις θρεπτικές ουσίες σε φυσικές λίμνες της Ελλάδας},

author = {Ζέρβα Ι. and Δ. Κεμιτζόγλου and Σ. Κατσαβούνη and Η. Νικολοπούλου and Β. Γιουρίεβα and Μ. Ζιώγα and Β. Ναυροζίδου and Μ. Σεφερλής and Μ. Σκόπα and Β. Τσιαούση.},

url = {http://hdl.handle.net/11340/2133},

year  = {2025},

date = {2025-05-29},

urldate = {2025-05-29},

booktitle = {16o Πανελλήνιο Συνέδριο Ελληνικής Υδροτεχνικής Ένωσης, Ξάνθη, 29-30 Μαίου 2025. Αναρτημένη Παρουσίαση.},

abstract = {Σύμφωνα με την Οδηγία2000/60/ΕΚ, η σύνθεση και η αφθονία των βιολογικών κοινοτήτων καθορίζουν την οικολογική κατάταξη μιας λίμνης, ενώ οι φυσικοχημικές παράμετροι, όπως ο ολικός φώσφορος, λειτουργούν υποστηρικτικά. Ο ολικός φώσφορος (TotalPhosphorus,TP) αποτελεί την πλέον προσδιοριζόμενη παράμετρο στις λίμνες και λειτουργεί ως περιοριστικό θρεπτικό-κλειδί. Για το λόγο αυτό πολλές Ευρωπαϊκές χώρες θέτουν όρια στις συγκεντρώσεις του (Kellyetal.,2022).},

keywords = {Λίμνες, Φυσικοχημική ανάλυση},

pubstate = {published},

tppubtype = {conference}

}

@conference{nokey,

title = {Εφαρμογή και Αξιολόγηση Μεθόδων Δορυφορικής Βαθυμετρίας (Satellite-derived Bathymetry) στη Λίμνη Τριχωνίδα με Δεδομένα Sentinel-2},

author = {Τ. Περιβολιώτη and Κ. Ζαχόπουλος and Α. Αποστολάκης and Α. Μουρατίδης},

url = {http://hdl.handle.net/11340/2134},

year  = {2025},

date = {2025-05-29},

urldate = {2025-05-29},

booktitle = {16ο Πανελλήνιο Συνέδριο Ελληνικής Υδροτεχνικής Ένωσης Ξάνθη, 29-30 Μαΐου 2025},

pages = {79-80},

abstract = {Η γνώση της βαθυμετρίας μιας λίμνης, αποτελεί βασικό εργαλείο για την κατανόηση, διαχείριση και προστασία των λιμναίων οικοσυστημάτων. Η πιο αξιόπιστη μέθοδος βαθυμετρίας είναι με την χρήση ηχοβολιστικών συστημάτων (sonars) (Viaña-Borja et al., 2023). Το μειονέκτημα της μεθόδου είναι η δυσκολία εφαρμογής σε μεγάλη κλίμακα, καθώς απαιτείται χρόνος και εξειδικευμένο προσωπικό. Μια ακόμα εναλλακτική εφαρμογή για την μέτρηση βάθους είναι η δορυφορική βαθυμετρία (SDB), η οποία προσφέρει σημαντικά πλεονεκτήματα, καθώς επιτρέπει τη χαμηλού κόστους, γρήγορη, επαναλαμβανόμενη αποτύπωση μεγάλων περιοχών, ακόμα και σε μη προσβάσιμες περιοχές (Xie et al., 2023). Ο συνδυασμός δορυφορικών και επιτόπιων δεδομένων μεγιστοποιεί την αποτελεσματικότητά καθώς τα δορυφορικά παρέχουν εύρος και συχνότητα, ενώ τα δεδομένα πεδίου προσφέρουν ακρίβεια και επικύρωση. Σκοπός της παρούσας εργασίας είναι η ανάπτυξη και η αξιολόγηση τριών διαφορετικών μοντέλων δορυφορικής βαθυμετρίας, βασισμένων σε δεδομένα Sentinel-2. Συγκεκριμένα, εφαρμόζονται οι μέθοδοι των Stumpf, Lyzenga και Log-Linear Ratio Model (LRM) για την εκτίμηση του βάθους της υδάτινης στήλης. Τα αποτελέσματα των μοντέλων συγκρίνονται με Ψηφιακό Μοντέλο Εδάφους, το οποίο προέκυψε από μετρήσεις πεδίου με τη χρήση ηχοβολιστικού συστήματος. Η παρούσα εργασία στοχεύει στην ανάδειξη των δυνατοτήτων των δορυφορικών δεδομένων ως εργαλείο για την βαθυμετρική αποτύπωση των ρηχών υδάτων.},

keywords = {Βαθυμετρία, Δορυφορική τηλεπισκόπηση, Λίμνες, Τριχωνίδα},

pubstate = {published},

tppubtype = {conference}

}

@conference{nokey,

title = {Cyanobacteria community status of two natural lakes (Pamvotida, Zazari) in Greece},

author = {Lortou, U. and I. Nikolopoulou and A. Zacharioudaki and K. Aligizaki and K. Moschandreou and V. Tsiaoussi},

url = {http://hdl.handle.net/11340/2122},

year  = {2025},

date = {2025-05-04},

urldate = {2025-05-04},

booktitle = {13th International Conference of Toxic Cyanobacteria, ICTC13, Chania, Crete, 4-8 May 2025. Poster presentation.},

abstract = {Cyanobacteria are among the most abundant microalgae taxa in freshwater lakes and play crucial role in their ecological dynamics. Cyanobacteria populations can proliferate significantly at elevated nutrient levels potentially leading to harmful blooms. Cyanobacterial biovolume (BV) can be used as a quantitative bioindicator in ecological studies and in monitoring potentially toxic cyanobacterial blooms. This study investigates the cyanobacterial community structure in two natural lakes. It presents a) the composition of cyanobacterial taxa, b) the temporal variations of cyanobacterial BV and c) a comparison between the lakes.},

keywords = {Cyanobacteria, Λίμνες},

pubstate = {published},

tppubtype = {conference}

}

@conference{Patsia2023b,

title = {Benthic macroinvertebrate communities in the littoral zone of Greek lakes},

author = {A. Patsia and Dimitra Kemitzoglou and Efpraxia Mavromati and Vasiliki Tsiaoussi},

url = {http://hdl.handle.net/11340/2101},

year  = {2023},

date = {2023-11-07},

urldate = {2023-11-07},

booktitle = {19th World Lake Conference, Balaton, Hungary, 7-9 November 2023. Poster presentation},

abstract = {Greek natural lakes are discerned into three categories according to depth: very shallow lakes (GR-VSNL, mean depth< 3m), shallow lakes (GR-SNL, mean depth: 3-9 m) and deep lakes (GR-DNL, mean depth >9 m) (Kagalou et al., 2021). Lake zoobenthos is regularly examined for the classification of ecological status according to Water Framework Directive (WFD) (EU, 2000). Research objectives are to present the benthic macroinvertebrate communities in the Greek natural lakes, classify their ecological status & to investigate potential differences in benthic macroinvertebrate communities according to lake depth.},

keywords = {Λίμνες, Μακροασπόνδυλα, Υγρότοποι},

pubstate = {published},

tppubtype = {conference}

}

@conference{Nikolopoulou2023,

title = {Phytoplankton and Ecological status of natural lakes in Greece},

author = {I. Nikolopoulou and V. Navrozidou and Kimon Moschandreou and Dimitra Kemitzoglou and Vasiliki Tsiaoussi},

url = {http://hdl.handle.net/11340/2089},

year  = {2023},

date = {2023-08-20},

urldate = {2023-08-20},

booktitle = {Eighth European Phycological Congress-EPC8 "Scientific Opportunities for a Global Algal Revolution", Brest, Brittany, France, 20-26 August 2023. Poster presentation.},

keywords = {Λίμνες, Υγρότοποι, Φυτοπλαγκτόν},

pubstate = {published},

tppubtype = {conference}

}

@conference{Kemitzoglou2023,

title = {Proposing biologically-based nutrient thresholds for Greek Lakes},

author = {Dimitra Kemitzoglou and E. Karadimou and S. Katsavouni and V. Navrozidou and I. Nikolopoulou and Miltiadis Seferlis and I. Zerva and Vasiliki Tsiaoussi},

url = {http://hdl.handle.net/11340/2084},

year  = {2023},

date = {2023-06-18},

urldate = {2023-06-18},

publisher = {13th Symposium for European Freshwater Sciences. Newcastle, UK 18-23/06/2023. Poster presentation. Η Συλλογή του ΕΚΒΥ},

abstract = {According to WFD, the composition and abundance of biological communities guide the assessment of lake ecological status; physicochemical parameters, such as nutrients, are supportive elements in this process. In this context, the thresholds of Good-Moderate (GM) status for Total Phosphorus concentrations (TP) in two high alkalinity lake types in Greece have been proposed using a European toolkit. Our objective was to investigate the conformity of GM thresholds for TP with changes in biological communities of two types of lake ecosystems, shallow polymictic and warm monomictic, in Greece. We examined pressure response relationships using data collated from the National Monitoring Network. We plotted parameters of phytoplankton, aquatic macrophytes and water transparency across TP concentrations in the two types of natural lakes. In TP threshold values of 20-40 μg/l changes in biological communities and water transparency were observed in both lake types. These nutrient thresholds seem comparable with the ones proposed with the application of a standard toolkit. Changes in the composition and abundance of biological communities, as well as in water transparency, appear to be explained by TP concentrations in two types of natural lakes in Greece. Efforts should focus in minimizing phosphorus loading in lake waters.},

keywords = {Λίμνες, Υγρότοποι, Φυσικοχημική ανάλυση},

pubstate = {published},

tppubtype = {conference}

}

@conference{Navrozidou2023,

title = {Phytoplankton taxonomic groups in relation to physicochemical parameters. A case study from Greek lakes},

author = {V. Navrozidou and I. Nikolopoulou and S. Katsavouni and Miltiadis Seferlis and Vasiliki Tsiaoussi},

url = {http://hdl.handle.net/11340/2083},

year  = {2023},

date = {2023-06-18},

urldate = {2023-06-18},

publisher = {13th Symposium for European Freshwater Sciences. Newcastle, UK 18-23/06/2023. Poster presentation. Η Συλλογή του ΕΚΒΥ},

abstract = {The composition, abundance and biomass of phytoplankton are long considered as indicative of the eutrophication pressure in lakes. In addition, cyanobacteria-formed algal blooms are mostly linked to poor water quality. The objectives of the present study were a) to explore phytoplankton groups and physicochemical parameters of lakes in a Mediterranean setting and b) to investigate the response of phytoplankton taxonomic groups to phosphorus loading in those lakes. We analyzed data from the National Monitoring Network from 2019-2021 for 16 freshwater lakes in Greece. Water transparency, ionic composition and Total Phosphorus (TP) were correlated with major phytoplankton groups (chlorophytes, dinoflagellates, cryptophytes, bacillariophyceae and cyanobacteria). Based on both phytoplankton and physicochemical parameters, two groups of lakes were formed in cluster analysis, corresponding a) to deep warm monomictic and b) shallow and very shallow polymictic lakes. With regard to the impact from phosphorus loading, in both groups of lakes, a considerable increase of cyanobacteria biomass along a TP gradient was observed. Chlorophytes showed a statistically significant response in relation to TP in shallow and very shallow lakes. The results highlight the importance of phytoplankton in monitoring and evaluation of the status of aquatic ecosystems as phytoplankton biomass and community structure respond to changes in environmental parameters.},

keywords = {Λίμνες, Υγρότοποι, Φυσικοχημική ανάλυση, Φυτοπλαγκτόν},

pubstate = {published},

tppubtype = {conference}

}

@conference{Patsia2023,

title = {Spatial and temporal variations of benthic macroinvertebrate communities in Lake Kastoria, Greece},

author = {A. Patsia and Dimitra Kemitzoglou and Efpraxia Mavromati and Vasiliki Tsiaoussi},

url = {http://hdl.handle.net/11340/2085},

year  = {2023},

date = {2023-06-18},

publisher = {13th Symposium for European Freshwater Sciences. Newcastle, UK 18-23/06/2023. Poster presentation. Η Συλλογή του ΕΚΒΥ},

abstract = {Lake Kastoria, in northwestern Greece, is a shallow urban natural lake. The objectives of this study were a) to investigate spatial and temporal variations of benthic macroinvertebrate communities in Lake Kastoria and b) to assess the lake water quality with the use of a WFD-compliant national method. Samplings were undertaken at the littoral zone of the lake at 5 selected sites during spring 2017 and 2021, according to the Hellenic Lake Littoral Benthos (HeLLBI) assessment method. Non-metric multidimensional (NMDS) scaling and one-way analysis of similarity percentages were applied to visualize similarities and to identify the taxa responsible for the discrimination in benthic macroinvertebrate communities between different sampling periods, among sites and water quality classes. In total, 5569 individuals were collected and 37 taxa groups were identified. NMDS plot provided a useful display of the actual multivariate distance among samples (stress value: 0.14). Benthic invertebrate communities showed considerable spatial variation at local scale (sampling site level) except for one site but no clear temporal variation. The mean EQR value of HeLLBI showed moderate water quality of the lake. All sites showed no change in their water quality across time except for 2 sites that improved (poor to moderate and good respectively). Benthic macroinvertebrates communities at good water quality sites differed in composition and showed higher biodiversity compared to those at moderate and poor sites. Management measures should be site-adapted in Lake Kastoria and priority could be given to the conservation and restoration of the littoral zone.},

keywords = {Λίμνες, Μακροασπόνδυλα, Υγρότοποι},

pubstate = {published},

tppubtype = {conference}

}

@conference{Karadimou2022,

title = {Lake Koronia, a wetland in gradual recovery process or a flash from the past?},

author = {E. Karadimou and V. Chrysopolitou and S. Katsavouni and V. Navrozidou and Dimitris Papadimos and Dimitrios Zervas and Vasiliki Tsiaoussi},

url = {http://hdl.handle.net/11340/2079},

year  = {2022},

date = {2022-08-22},

urldate = {2022-08-22},

publisher = {6th European Congress of Conservation Biology: “Biodiversity crisis in a changing world”, Prague, Czech Republic 22-26/08/2022. Poster presentation. Η Συλλογή του ΕΚΒΥ},

abstract = {Lake Koronia, Greece, is a wetland of international and European importance (Ramsar and Natura 2000 site). The lake has deteriorated in terms of habitats, water quantity and quality since 1995, resulting in mass fish and bird deaths. We monitored abiotic and biotic (aquatic macrophytes) parameters between 2015 and 2021 to investigate recovery progress, following implementation efforts of a restoration plan. Abiotic conditions were recorded monthly/seasonally, while vegetation data were recorded in two periods (June 2017, 2020). After an initial considerable increase in water level, mean annual values fluctuated at around 70-71 m asl. Water transparency values were low while conductivity values were high. Three vegetation units were present: Lemnetea, Potamogetonetea and Phragmitetea, represented by few taxa. Helophytic taxa formed a narrow littoral reedbed (< 10 % of the lake area). Few rooted hydrophytes were present but limited to sparse patches (< 5 % of the total abundance). These results indicate that vegetation stabilization or even further expansion could be possible, given that hydrological and physicochemical conditions improve. The possible recovery of this fragile ecosystem depends on both the mitigation of anthropogenic pressures and favourable natural conditions. The continuation of restoration measures and monitoring efforts are considered necessary in this direction.},

keywords = {Λίμνες, Υγρότοποι},

pubstate = {published},

tppubtype = {conference}

}

@conference{Zervas2019b,

title = {Phytosociological analysis of the aquatic vegetation of the main Greek freshwater lakes},

author = {Dimitrios Zervas and Vasiliki Tsiaoussi and Ioannis Tsiripidis},

url = {http://hdl.handle.net/11340/1972},

year  = {2019},

date = {2019-06-30},

urldate = {2019-06-30},

publisher = {11th Symposium for European Freshwater Sciences. Zagreb, Croatia 30/06-05/07/2019. Poster presentation. Η Συλλογή του ΕΚΒΥ},

keywords = {Λίμνες, Υγρότοποι, Υδρόβια βλάστηση},

pubstate = {published},

tppubtype = {conference}

}

@conference{nokey,

title = {Hydromorphological features of Greek lakes: First results from the monitoring network},

author = {Dimitra Kemitzoglou and Antonis Apostolakis and S. Katsavouni and Efpraxia Mavromati and Dimitris Papadimos and Vasiliki Tsiaoussi},

url = {http://hdl.handle.net/11340/2087},

year  = {2015},

date = {2015-07-05},

urldate = {2015-07-05},

publisher = {9th Symposium for European Freshwater Sciences. Geneva, Switzerland 05-10/07/2015. Poster presentation. Η Συλλογή του ΕΚΒΥ. Η Συλλογή του ΕΚΒΥ},

keywords = {Hydromorphology, Λίμνες, Υγρότοποι},

pubstate = {published},

tppubtype = {conference}

}