The role of aquatic vegetation in wetland ecosystems is closely related with their abundance, diversity and distribution, which in turn represents synergy of various environmental factors. The floristic composition of the aquatic vegetation in two neighboring lakes (Vegoritida and Petron) in north-central Greece was investigated by means of 160 relevés, which were recorded using the Braun-Blanquet method. The analysis of relevés based on TWINSPAN clustering showed the existence of 10 plant communities from the Lemnetea, Potametea, Phragmito-Magnocaricetea and Juncetea maritimi classes. The most important environmental factors for the vegetation differentiation in the study area, according to the ordination diagram, are light intensity and water depth of the habitats. The plant species diversity was quantified with species richness, Shannon Diversity and evenness indices at a scale of each relevé, with a sampling size of 20 m2. There was a clear differentiation between the relevés at the more eutrophic Petron Lake and those at Vegoritida Lake. The mean plot diversity was also calculated for each plant community, to enable comparison of the diversity indices among the communities at the plot level
ΕΡΕΥΝΑ ΘΑΛΑΣΣΙΑΣ ΒΛΑΣΤΗΣΗΣ ΚΑΙ ΧΛΩΡΙΔΑΣ ΣΤΟ ΘΕΡΜΑΙΚΟ ΚΟΛΠΟ- ΘΕΣΣΑΛΟΝΙΚΗ, ΑΠΟ ΤΟ 1969-1975. ΜΕΛΕΤΗΘΗΚΕ Η ΠΟΙΟΤΙΚΗ ΚΑΙ ΠΟΣΟΤΙΚΗ ΣΥΝΘΕΣΗ ΤΩΝ ΘΑΛΑΣΣΙΩΝ ΦΥΤΟΚΟΙΝΩΝΙΩΝ ΤΩΝ ΒΕΝΘΙΚΩΝ ΜΑΚΡΟΦΥΚΩΝ (ΧΛΩΡΟΦΥΚΩΝ, ΦΑΙΟΦΥΚΩΝ ΚΑΙ ΡΟΔΟΦΥΚΩΝ) ΠΟΥ ΑΝΑΠΤΥΣΣΟΝΤΑΙ ΣΕ ΒΑΘΟΣ 4 ΜΕΤΡΑ. ΠΡΟΣΔΙΟΡΙΣΤΗΚΑΝ 121 ΤΑΧΑ ΑΠΟ ΤΙΣ ΟΠΟΙΕΣ 24 ΧΛΩΡΟΦΥΚΗ, 29ΦΑΙΟΦΥΚΗ ΚΑΙ 68 ΡΟΔΟΦΥΚΗ. Ο ΛΟΓΟΣ R/P 2,25 ΑΡΑ Ο ΧΑΡΑΚΤΗΡΑΣ ΤΗΣ ΧΛΩΡΙΔΑΣ ΕΙΝΑΙΒΟΡΕΙΟΣ ΜΕΤΑΒΑΛΛΟΜΕΝΟΣ. ΕΡΕΥΝΗΘΗΚΕ Η ΕΠΟΧΙΑΚΗ ΚΑΤΑΝΟΜΗ ΚΑΙ ΔΙΑΚΥΜΑΝΣΗ ΤΩΝ ΔΙΑΦΟΡΩΝ ΒΕΝΘΙΚΩΝ ΜΑΚΡΟΦΥΚΩΝ ΜΕ ΜΕΓΙΣΤΗ ΒΙΟΜΑΖΑ ΤΟΥΣ ΘΕΡΙΝΟΥΣ ΜΗΝΕΣ. ΑΝΑΓΝΩΡΙΣΘΗΚΑΝ15 ΦΥΤΟΚΟΙΝΩΝΙΕΣ ΑΝΗΚΟΥΝ ΣΕ ΝΙΤΡΟΦΙΛΕΣ ΚΑΙ ΑΝΑΠΤΥΣΣΟΝΤΑΙ ΣΕ ΡΥΠΑΙΝΟΜΕΝΟΥΣ ΒΙΟΤΟΠΟΥΣ Ο ΧΑΡΑΚΤΗΡΑΣ ΤΗΣ ΧΛΩΡΙΔΑΣ ΔΕΙΧΝΕΙ ΟΤΙ ΥΠΕΡΕΧΟΥΝ ΤΑ ΕΝΔΗΜΙΚΑ-ΜΕΣΟΓΕΙΑΚΑ. ΗΔΙΑΧΡΟΝΙΚΗ ΜΕΛΕΤΗ ΤΩΝ ΦΥΤΟΚΟΙΝΩΝΙΩΝ ΕΔΕΙΞΕ ΜΙΑ ΜΕΙΩΣΗ ΤΩΝ ΒΕΝΘΙΚΩΝ ΟΜΑΔΩΝ ΣΕ ΠΡΟΒΛΗΜΑΤΙΚΟΥΣ (ΡΥΠΑΙΝΟΜΕΝΟΥΣ) ΒΙΟΤΟΠΟΥΣ;
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