Κατεύθυνση Βιολογική Ωκεανογραφία
Library of the School of Science

2018-10-11

2018

Fafouti Katerina

1. Α. ΟΙΚΟΝΟΜΟΥ – ΑΜΙΛΛΗ (Καθηγήτρια Οικολογίας Υδάτινων Οικοσυστημάτων – Επιβλέπουσα Καθηγήτρια)

2. Μ. ΔΑΣΕΝΑΚΗΣ (Καθηγητής Χημείας Περιβάλλοντος – Μέλος Συμβουλευτικής Επιτροπής)
3. Σ. ΟΡΦΑΝΙΔΗΣ (Τακτικός Ερευνητής στην Υδροβιολογία - Μέλος Συμβουλευτικής Επιτροπής)

«H επίδραση της διαφοροποίησης του υποστρώματος στη σύνθεση της θαλάσσιας επιφυτικής κοινότητας των διατόμων (Bacillariophyceae)»

Greek

"The effect of substrate differentiation on the composition of the marine epiphytic community of diatoms (Bacillariophyceae) »

Many published works so far suggest that host plants, as biological substrates, are directly related to surface epiphyton. However, some studies support the neutral substrate hypothesis. Nowadays, the possible association of the host plant and the epiphyton has not yet been clarified. In this diploma thesis, epiphyton species were collected from different macroalgal taxa and the basic question was tested, regardless of whether the architecture of the various taxa affects the composition of their surface epiphyton. Such an approach could indicate the relative effect of the plant organization on the epiphyton and whether this effect is significant or insignificant. The duration of the study of the diatoms investigated was less than one year and was carried out in one location marine ecosystem.

Although the results of this work show that there were some important correlations between epiphytic species and host phytobenthic plants, the substrate specialization appears rather unlikely to be true. In this case, there was no specialization between the epiphyton and the substrate. In general, there were 73 different taxa of diatoms and low substrate specificity was found. As a result, the outcome of the analysis on the substrate specificity reinforces the finding that the effect of the host plant on the epiphyton concerned is almost negligible.
The present thesis is focused on the structure of the epiphytic community and supports the ‘neutral substrate hypothesis’. Probably, it is not the architecture of the host plant that defines the structure of the epiphyton community, but more indirect influences related to the host plant. It has been concluded that seasonality is the determinant of the composition of surface diatom community in different genus species. However, it is not clear how other factors (areas, host plant and environmental parameters) will affect other epiphyton characteristics. Thus, future work should carry out similar research, but under an extensive perspective.

Science

host plants, epiphyton, surface epiphyton, marine ecosystem, substrate specialization, neutral substrate hypothesis, architecture of the host plant, seasonality, different genus species

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https://pergamos.lib.uoa.gr/uoa/dl/object/2809233