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Identifier uch.biology.msc//2006pesmatzoglou
Title Μελέτη της εαρινής δυναμικής και παραγωγικότητας του φυτοπλαγκτού σε σχέση με φυσικοχημικούς παράγοντες σε ένα παράκτιο ολιγοτροφικό οικοσύστημα
Author Πεσματζόγλου, Ιωάννης
Author Κοτζαμπάσης, Ιωάννης
Abstract In the present study we examined the response of phytoplankton productivity and community structure to the physicochemical changes that take place during spring in a mediterranean oligotrophic coastal ecosystem. Field sampling was conducted from February to June 2005 in a shallow coastal station in the Gulf of Heraklion (Cretan Sea). Sampling included measurements of basic environmental and biological parameters of the water column, collection of water samples for phytoplankton community analysis and in situ primary production measurements at several different depths of the euphotic zone. As expected, we observed a spring diatom bloom (early mid March), followed by increasing numbers of dinoflagellates. The course of phytoplankton succession coincided with a rapid decline of nutrients (inorganic nitrogen and phosphorus) and preceded the formation of seasonal thermocline. After column stabilization (mid June), a second diatom burst was recorded exclusively in the surface layer (above the thermocline), probably triggered by an exogenous, superficial nutrient pulse. Statistical analysis of the data suggested that temperature, irradiance and phosphate had an important effect on the variations of primary productivity and were also highly related to the community pattern. This is a strong indication of a powerful bottom-up control of phytoplankton both in functional and in structural terms.
Language Greek
Issue date 2006-11-27
Collection   School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses
  Type of Work--Post-graduate theses
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