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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
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Παυλούδη, Χριστίνα
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Thesis advisor
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Καρακάσης, Ιωάννης
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Reviewer
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Αρβανιτίδης, Χρήστος
Κωτούλας, Γεώργιος
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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.
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Language |
Greek |
Subject |
Amvrakikos gulf |
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Heavy metals |
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Microbial diversity |
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Pyrosequencing |
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Αμβράκικος κόλπος |
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Λιμνοθάλασσα |
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Μικροβιακή ποικιλότητα |
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Πυροαλληλούχιση |
Issue date |
2012-11-16 |
Collection
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School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/6/4/d/metadata-dlib-1353479293-857363-19146.tkl
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Views |
280 |