The influence of changes in nutrient ratios on several biological processes in Inner Bay of Izmir

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dc.contributor.authorOezkan, Ebru Yesim
dc.contributor.authorBueyuekisik, Baha
dc.contributor.authorKoray, Tufan
dc.contributor.authorSabanci, Fatma
dc.date.accessioned2019-10-27T19:54:44Z
dc.date.available2019-10-27T19:54:44Z
dc.date.issued2008
dc.departmentEge Üniversitesien_US
dc.description.abstractThe dilution method was employed in Inner Bay of Izmir in order to measure the phytoplankton community potential growth rate and grazing rate in May 2005. In this study, the percentage of primary production consumed via grazing and the significance of grazing in food chain were emphasized. The dilution technique was studied on the natural sea water enriched with various Si:N and N:P ratios. Nitrogen limitation was observed in Si:N experiment series. The consumed percentage of primary production via grazing increased with the rising Si:N ratio while the grazed percentage of biomass was decreased. The net growth rate of phytoplankton was greater than the grazing rate at a Si: N ratio of 0.34 and 1.31. For greater ratios, grazing rate became higher than the net growth rate. From the data obtained, it was concluded that microplankton is able to keep the size of the algal populations around the steady state. The Si:N ratio in Izmir Bay is approximately 6 on May 18, 2005. Because of the nitrogen treatment that tends to increase this ratio in the sea water, microzooplankton grazing must limit phytoplankton blooms. The changes in Si:N ratios can account for the 83-98% of the taxon-specific grazing. Prorocentrum gracile, Cylindrotheca closterium and picoplankton were the most abundant species observed constantly both in Si:N ratio and N:P ratio series. Quite few and negative in situ growth rates revealed that nutrient limitation was also of great significance besides grazing on phytoplankton. The N:P ratio of 4 in the environment indicated that Prorocentrum gracile and Cylindrothece closterium would be consumed via grazing and picoplankton would be tinder pressure by nutrient limitation.en_US
dc.description.sponsorshipEge University Scientific ResearchEge University [03/SUF/018]en_US
dc.description.sponsorshipThis work was supported by Ege University Scientific Research Project (BAP) (no.03/SUF/018), "The investigation of the influence of changes in nutrient ratios on several biological processes".en_US
dc.identifier.endpage114en_US
dc.identifier.issn1303-2712
dc.identifier.issn2149-181X
dc.identifier.issue1en_US
dc.identifier.startpage103en_US
dc.identifier.urihttps://hdl.handle.net/11454/40563
dc.identifier.volume8en_US
dc.identifier.wosWOS:000258665000017en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakTR-Dizinen_US
dc.language.isoenen_US
dc.publisherCentral Fisheries Research Insten_US
dc.relation.ispartofTurkish Journal of Fisheries and Aquatic Sciencesen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectSi : Nen_US
dc.subjectN : Pen_US
dc.subjectprimary productionen_US
dc.subjectgrowth rateen_US
dc.subjectgrazingen_US
dc.titleThe influence of changes in nutrient ratios on several biological processes in Inner Bay of Izmiren_US
dc.typeArticleen_US

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