Your browser does not support JavaScript!

Home    Συγκριτική ανάλυση γεωχημικών μεταβλητών και μακροπανιδικών και μικροβιακών κοινοτήτων σε λιμνοθαλάσσια οικοσυστήματα  

Results - Details

Add to Basket
[Add to Basket]
Identifier 000376380
Title Συγκριτική ανάλυση γεωχημικών μεταβλητών και μακροπανιδικών και μικροβιακών κοινοτήτων σε λιμνοθαλάσσια οικοσυστήματα
Alternative Title Comparative analysis of geochemical variables, macrofaunal and microbial communities in Lagonal ecosystems
Author Παυλούδη, Χριστίνα
Thesis advisor Καρακάσης, Ιωάννης
Reviewer Αρβανιτίδης, Χρήστος
Κωτούλας, Γεώργιος
Abstract Lagoons are enriched habitats, with unstable environmental conditions caused by their confinement from the sea and their shallow depth. Τhe frequent fluctuations of the abiotic parameters cause severe changes in the abundance and distribution of organisms. This relationship has been studied extensively for macrofaunal species, but not sufficiently for the lagoonal microbial diversity. The aim of the present study was to explore the biodiversity patterns of microorganismic assemblages and to examine whether these patterns are associated with those of the contextual environmental parameters and the macrofaunal ones. For this purpose, sediment samples were collected from four lagoons, located in Amvrakikos Gulf (Ionian Sea, Western Greece). In each lagoon, two sampling stations were chosen, with different connectivity degree with the sea. A number of abiotic parameters were measured for every station, including the sediment concentrations of heavy metals and elements. Polychaete samples were collected and identified at the species level. Microbial DNA was extracted from the sediment upper layer (0-2cm) and was further processed through deep sequencing of the V5-V6 region of the 16S rRNA gene by next generation sequencing. The results of this study suggest that, in the studied lagoonal ecosystem, the macrofaunal assemblages do not seem to be affected by the sane environmental parameters the affect the distribution of the microbial community, and that the distribution patterns of the prokaryotes and the polychaetes are not correlated. Both the microbial communities and the polychaete assemblages are affected by the synergistic action of multiple abiotic parameters, denoting the importance of the «multicausal environmental severity hypothesis» for these ephemeral ecosystems. Finally, the findings of this study provide support to the aspect of the use of the microbial communities as bioindicators of the ecological status of the lagoonal ecosystems; their advantage is largely owed to their larger organismic and functional diversity.
Language Greek
Subject Amvrakikos gulf
Heavy metals
Microbial diversity
Pyrosequencing
Αμβράκικος κόλπος
Λιμνοθάλασσα
Μικροβιακή ποικιλότητα
Πυροαλληλούχιση
Issue date 2012-11-16
Collection   School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses
  Type of Work--Post-graduate theses
Views 277

Digital Documents
No preview available

Download document
View document
Views : 6