On the role of dinitrogen (N2) fixing cyanobacteria in marine environments with special focus on release and transfer of nitrogen (N).

Wannicke, Nicola (2009) On the role of dinitrogen (N2) fixing cyanobacteria in marine environments with special focus on release and transfer of nitrogen (N). (PhD/ Doctoral thesis), Universität Rostock, Rostock, Germany, 176 pp.

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Abstract

The aim of this PhD-thesis was to contribute to the existing knowledge on the role of diazotrophic cyanobacteria in marine environments. In the first part dealt with N2 and C fixations as well as the release of N and C compounds, which were tightly regulated. The second part aimed at the quantification of diazotrophic N transferred to mesozooplankton species. Because filamentous cyanobacteria are grazed upon only by a limited number of zooplankter the profound transfer of newly fixed N in the Baltic Sea was mediated by microbial loop constituents (67%).
Das Ziel dieser Promotion war es, die Rolle N2 fixierender Cyanobakterien in marinen Ökosystemen zu beleuchten. Im ersten Teil der Arbeit wurden N2 und C Fixierung untersucht, sowie die anschließende Abgabe gelöster N und C Verbindungen, welche sich als eng an die Quantität des vorher fixierten N2 gekoppelt herausstellte. Der zweite Teil hatte das Ziel, den Transfer von diazotrophen N in das Mesosooplankton zu quantifizieren. Da filamentöse Cyanobakterien nur selten direkt gefressen werden, erfolgte der vorwiegende Anteil des Transfers über das mikrobielle Nahrungsnetz (67%).

Document Type: Thesis (PhD/ Doctoral thesis)
Thesis Advisor: Voss, Maren
Keywords: nitrogen fixation; cyanobacteria; food web; POSEIDON; Heincke; Islandia; POS348; POS353
Open Access Journal?: Yes
Projects: SOPRAN, TRACES
Expeditions/Models/Experiments:
Date Deposited: 11 Jan 2013 12:52
Last Modified: 25 Sep 2015 08:59
URI: http://oceanrep.geomar.de/id/eprint/20066

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