Assessing mesozooplankton trophic levels in the Baltic Sea and North Sea: A stable isotope study

Agurto, Cristian (2007) Assessing mesozooplankton trophic levels in the Baltic Sea and North Sea: A stable isotope study (Doctoral thesis/PhD), Christian-Albrechts-Universität, Kiel, 135 pp

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Abstract

For decades, ecologists have studied trophic interaction in aquatic systems, and described the food web structure of dominant ecological groups based on gut content analyses. The conception of these interactions may, however, be biased by the lack of couplings to the microbial food web and direct errors in diet analyses (e.g. differences in digestion rate between food types). In this thesis, I examined the planktonic food web by analyzing the trophic structure (i.e. trophic levels) with an alternative technique, the abundances and fractionation of stable isotope. I used natural abundances of stable isotopes of nitrogen (delta15N) and carbon (delta13C) to describe the food web structure of mesozooplankton communities in the Central Baltic Sea (Bornholm Basin, Gdansk deep and Gotland Basin) and Southern North Sea (German Bight). I focused on assessing spatial and seasonal isotopic variation with respect to trophic levels of the dominant mesozooplankton species in both marine systems. The stable isotopes of nitrogen and carbon provide powerful tools for assessing trophic levels of and carbon flow to consumers in the food web.

Document Type: Thesis (Doctoral thesis/PhD)
Thesis Advisors: Sommer, Ulrich and Sommer, Frank
Keywords: Ecology; Marine Biology; Mesozooplankton, Stable isotope, Nitrogen, Carbon, Trophic enrichment, Trophic level
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: No
Date Deposited: 03 Dec 2008 16:51
Last Modified: 06 Jul 2012 15:11
URI: http://eprints.uni-kiel.de/id/eprint/5043

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