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JPR Advance Access published online on February 26, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh048
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Received December 4, 2003;
accepted February 5, 2004

Short Communication

{delta}15N signatures of marine mesozooplankton and seston size fractions in Kiel Fjord, Baltic Sea

Frank Sommer 1* and Ulrich Sommer 1

1 Leibniz-Institut für Meereswissenschaften, Experimental Ecology, Düsternbrooker Weg 20, D-24105 Kiel, Germany

* To whom correspondence should be addressed. E-mail: fsommer{at}ifm-geomar.de.


  Abstract

The {delta}15N of marine mesozooplankton species was measured on four occasions. Significant differences were found between copepods and meroplanktonic larvae, yet not between holoplanktonic species. On average, mesozooplankton was enriched by 3.4±0.9{per thousand} relative to selected seston size fractions. Despite suggesting small differences (~0.5 to 1{per thousand}) in the {delta}15N of different phytoplankton taxa on one occasion, the size fractionation procedure generally proved inadequate in separating major taxonomic groups composing seston. This circumstance, and phase-shifts in the transmission of rapid changes (>2{per thousand}) in seston {delta}15N to mesozooplankton complicate the calculation of mesozooplankton trophic levels.


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