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| Identifier |
000454368 |
| Title |
Χωρική και βαθυμετρική κατανομή μεσοζωοπλαγκτού στο Θερμαϊκό Κόλπο |
| Alternative Title |
Spatial and bathymetric distribution of mesozooplankton in Thermaikos Gulf |
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Author
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Αναδολή, Όλγα Σ.
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Thesis advisor
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Σωμαράκης, Στυλιανός
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Reviewer
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Μιχαλούδη, Ευαγγελία
Κουμουνδούρος, Γεώργιος
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| Abstract |
Mesozooplankton is consisted of aquatic metazoans that range in size between 200 μm
and 20 nm and are not able to actively swim against the water currents. These organisms play a
major role in the pelagic food webs being the connecting link between phytoplankton and small
pelagic fish. Mesozooplankton distribution changes both horizontally and vertically, however
investigations on the vertical distribution of zooplanktonic organisms are scant in the
Mediterranean Sea. The aim of the present thesis was to study the spatial and vertical
distribution of mesozooplankton in Thermaikos Gulf during the summer stratification period. For
this purpose, zooplankton samples were collected over a grid of nine stations and five layers per
station (NET1, NET2, NET3, NET4 and NET5) in the outer part of the Gulf during June 2016. The
intermediate sampling layer (NET3) included the zone with presumably highest plankton biomass
as inferred by the research vessel’s echosounder (layer of maximum planktonic echo). In the
laboratory, mesozooplankton organisms were identified to the lowest possible taxonomic level
and their numbers were measured. Furthermore, their biomass was estimated based on length-
weight equations reviewed and compiled from the literature. To our knowledge, this is the first
study on small-scale bathymetric distribution of mesozooplankton in the eastern Mediterranean.
Total abundance of mesozooplankton increased from the deepest to the shallowest layer of the
water column while biomass was higher in the surface layer and the layer of maximum acoustic
backscattering. Copepods dominated the deeper layers while doliolids were abundant across the
entire water column, presenting maximum abundance in NET3. Vertical distributions of
zooplanktonic organisms exhibited distinctive patterns: dominance of Clausocalanus spp. and
Mesocalanus tenuicornis copepodites, the calanoid Clausocalanus peregens and the
appendicularians Fritillaria in the deeper layers, close to the chlorophyll maximum and
dominance of the cladocerans Penilia avirostris and Evadne spinifera as well as the copepods Paracalanus spp. and Temora stylifera in the layers above the thermocline. The most abundant
copepods in intermediate layers were Clausocalanus jobei, Oithona plumifera and Oncaea media.
Finally, the cladoceran P. avirostris markedly dominated the surface layer exhibiting abundances
up to και 2179 individuals m-3. The latter is particularly benefitted from the high temperatures in
Thermaikos Gulf’s coastal waters during the summer stratification period.
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| Language |
Greek |
| Subject |
Μεσοζωοπλακτό |
| Issue date |
2023-03-24 |
| 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/b/a/7/metadata-dlib-1678972864-9081-14251.tkl
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| Views |
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