scholarly journals Study of the climatic changes in the North Aegean Sea and their effects on the ecosystem dynamics

2021 ◽  
Author(s):  
Αθανάσιος Γκανάσος
Keyword(s):  
Aegean Sea ◽  
Climatic Changes ◽  
Ecosystem Dynamics ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea

Η κλιματική αλλαγή έχει γίνει πιο αισθητή από ποτέ και ήδη επηρεάζει το θαλάσσιο οικοσύστημα σε παγκόσμια κλίμακα. Για τη μελέτη των μεταβαλλόμενων κλιματικών συνθηκών, εστιάσαμε στο Βόρειο Αιγαίο και στα πιο διαδεδομένα είδη μικρών πελαγικών ψαριών, τον γαύρο και τη σαρδέλα. Μελετήσαμε τις συνέπειες στα είδη από τις αλλαγές στη θερμοκρασία, την αλατότητα, την εισροή νερών από τη Μαύρη Θάλασσα και μεταβολή της εισροής θρεπτικών από τα γειτονικά ποτάμια. Για τις ανάγκες της μελέτης αναπτύχθηκε ένα πολυειδικό (γαύρος/σαρδέλα), πλήρους κύκλου ζωής μοντέλο για το Βόρειο Αιγαίο, αμφίδρομα συζευγμένο με υδροδυναμικό βιογεωχημικό μοντέλο. Η αρχική μονοδιάστατη εκδοχή του μοντέλου, προσομοίωσε επιτυχώς την ανάπτυξη, τις βιομάζες και τις περιόδους αναπαραγωγής και των δύο ειδών, ενώ επιπρόσθετα διαφάνηκε μία ξεκάθαρη εξάρτηση ανάμεσα στην αλίευση των ειδών και τη συγκέντρωση ζωοπλαγκτού. Το επόμενο βήμα στην ανάπτυξη του μοντέλου, απέδωσε την τρισδιάστατη εκδοχή αυτού. Τα κυριότερα χαρακτηριστικά και η χωρική κατανομή των βιομαζών των ειδών, ήταν για άλλη μια φορά σε συμφωνία με τα δεδομένα. Επιπρόσθετες προσομοιώσεις έδειξαν πως τοπικά τα είδη ανταγωνίζονται για την τροφή. Προσομοιώσεις με χρήση κλιματικών σεναρίων IPCC έδειξαν πως μια μελλοντική αύξηση της θερμοκρασίας θα οδηγήσει σε υποβάθμιση του οικοσυστήματος μέσω της μείωσης των πλαγκτονικών συγκεντρώσεων, επηρεάζοντας αρνητικά τον γαύρο και οδηγώντας σε επικράτηση της σαρδέλας. Τέλος, μεταβολές στα εισερχόμενα από τα ποτάμια θρεπτικά και στην εισροή υδάτων από τη Μαύρη Θάλασσα, επίσης υποβαθμίζουν τους πληθυσμούς των ειδών.

Geodetic analysis of the tectonic crustal deformation pattern in the North Aegean Sea, Greece

2021 ◽  
Author(s):  
Ilias Lazos ◽  
Sotirios Sboras ◽  
Christos Pikridas ◽  
Spyros Pavlides ◽  
Alexandros Chatzipetros
Keyword(s):  
Crustal Deformation ◽  
Aegean Sea ◽  
Deformation Pattern ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea

scholarly journals A three dimensional, full life cycle, anchovy and sardine model for the North Aegean Sea (Eastern Mediterranean): Validation, sensitivity and climatic scenario simulations

2021 ◽  
Vol 22 (3) ◽  
pp. 653
Author(s):  
ATHANASIOS GKANASOS ◽  
EUDOXIA SCHISMENOU ◽  
KOSTAS TSIARAS ◽  
STYLIANOS SOMARAKIS ◽  
MARIANNA GIANNOULAKI ◽  
...  
Keyword(s):  
Temperature Increase ◽  
Eastern Mediterranean ◽  
Larval Growth ◽  
Somatic Growth ◽  
Aegean Sea ◽  
Fish Growth ◽  
Prey Concentration ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea

We present the development of a 3D full-lifecycle, individual-based model (IBM) for anchovy and sardine, online coupled to an existing hydrodynamic/biogeochemical low-trophic level (LTL) model for the North Aegean Sea. It was built upon an existing 1D model for the same species and area, with the addition of a horizontal movement scheme. In the model, both species evolve from the embryonic stage (egg+yolk sac larva) to the larval, juvenile, and adult stages. Somatic growth is simulated with the use of a “Wisconsin” type bioenergetics model and fish populations with an adaptation of the ‘super individuals’ (SI) approach. For the reference simulation and model calibration, in terms of fish growth and population biomass, the 2000-2010 period was selected. Interannual biomass variability of anchovy was successfully represented by the model, while the simulated biomass of sardine exhibited low variability and did not satisfactorily reproduce the observed interannual variability from acoustic surveys. The spatial distribution of both species’ biomass was in relatively good agreement with field data. Additional single-species simulations revealed that species compete for food resources. Temperature sensitivity experiments showed that both species reacted negatively to a temperature increase. Anchovy, in particular, was more affected since its spawning and larval growth periods largely overlap with the period of maximum yearly temperature and low prey concentration. Finally, simulation experiments using IPCC climatic scenarios showed that the predicted temperature increase and zooplankton concentration decrease in the future will negatively affect anchovy, resulting in sardine prevalence.

Macrofauna associated with the sponge Verongia aerophoba in the north Aegean Sea

1987 ◽  
Vol 24 (2) ◽  
pp. 265-278 ◽  
Author(s):  
H.E. Voultsiadou-Koukoura ◽  
A. Koukouras ◽  
A. Eleftheriou
Keyword(s):  
Aegean Sea ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea

scholarly journals Erratum to: The Lemnos 8 January 2013 (M w=5.7) earthquake: fault slip, aftershock properties and static stress transfer modeling in the north Aegean Sea

2014 ◽  
Vol 19 (1) ◽  
pp. 273-273
Author(s):  
Athanassios Ganas ◽  
Zafeiria Roumelioti ◽  
Vassilios Karastathis ◽  
Konstantinos Chousianitis ◽  
Alexandra Moshou ◽  
...  
Keyword(s):  
Stress Transfer ◽  
Aegean Sea ◽  
Fault Slip ◽  
Static Stress ◽  
Earthquake Fault ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea

scholarly journals Coccolithophore assemblage response to Black Sea Water inflow into the North Aegean Sea (NE Mediterranean)

2017 ◽  
Vol 149 ◽  
pp. 138-150 ◽  
Author(s):  
B.-Th. Karatsolis ◽  
M.V. Triantaphyllou ◽  
M.D. Dimiza ◽  
E. Malinverno ◽  
A. Lagaria ◽  
...  
Keyword(s):  
Black Sea ◽  
Sea Water ◽  
Aegean Sea ◽  
Water Inflow ◽  
The North ◽  
North Aegean ◽  
Ne Mediterranean ◽  
North Aegean Sea

scholarly journals Development, application and evaluation of a 1-D full life cycle anchovy and sardine model for the North Aegean Sea (Eastern Mediterranean)

PLoS ONE ◽  
2019 ◽  
Vol 14 (8) ◽  
pp. e0219671 ◽  
Author(s):  
Athanasios Gkanasos ◽  
Stylianos Somarakis ◽  
Kostas Tsiaras ◽  
Dimitrios Kleftogiannis ◽  
Marianna Giannoulaki ◽  
...  
Keyword(s):  
Life Cycle ◽  
Eastern Mediterranean ◽  
Aegean Sea ◽  
The North ◽  
Full Life Cycle ◽  
North Aegean ◽  
Full Life ◽  
North Aegean Sea ◽  
Development Application

scholarly journals Perceptions of Agritourism and Cooperation: Comparisons between an Island and a Mountain Region in Greece

2019 ◽  
Vol 11 (3) ◽  
pp. 680 ◽  
Author(s):  
Sofia Karampela ◽  
George Papapanos ◽  
Thanasis Kizos
Keyword(s):  
Best Practices ◽  
Qualitative Data ◽  
Aegean Sea ◽  
Mountain Region ◽  
Lexical Database ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea ◽  
Depth Interviews ◽  
Common Understanding

The lack of understanding and definitional inconsistencies regarding agritourism and the importance of cooperation in sustaining this kind of tourism are underlined in the literature. This study analyzes the perceptions of agritourism and cooperation from actors in the sector using a plurality of methods, including unsupervised (a) text mining and (b) sentiment analysis with the use of a lexical database, as well as (c) supervised qualitative data analysis. Based on the assumption that destinations with different geographic characteristics have different features and products, two different destinations as for its accessibility and tourism recognition were selected for comparison: (a) an island—Lesvos in the North Aegean Sea, and (b) a continental mountain region—Plastiras Lake, in Greece. The data were collected from personal in-depth interviews and with the use of semi-structured questionnaires. From a methodological perspective, all three methods provided unique insights on the study’s themes, and the overall image of agritourism and cooperation was positive. A common understanding seems important for cooperation and networking; however, training is needed not only for effective promotion of agritourism, but also for cooperation techniques, benefits, trust-building mechanisms and best practices.

Energy design investigation for the Greek area of the North Aegean Sea

2001 ◽  
Vol 24 (2) ◽  
pp. 171-183
Author(s):  
G Mihalakakou ◽  
M Santamouris ◽  
H Kovras
Keyword(s):  
Aegean Sea ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea
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