Marine Biology

, Volume 116, Issue 4, pp 565–570 | Cite as

Stable isotope and biochemical fractionation in the marine pelagic food chain: the jellyfish Pelagia noctiluca and net zooplankton

  • A. Malej
  • J. Faganeli
  • J. Pezdič
Article

Abstract

In our field study we analyzed the C and H isotopic and biochemical (C, N, P, protein, lipid, carbohydrate) composition of the jellyfish Pelagia noctiluca (collected from the Gulf of Trieste in 1985 to 1986) and its presumed diet-net zooplankton. The mean δ 13C (-18.8‰) and δ D (-58.4‰) ratios of P. noctiluca showed enrichment in heavy isotopes relative to net zooplankton (∼2‰ for carbon and ∼30‰ for hydrogen). Both the jellyfish and net zooplankton were characterized by a linear correlation between δ 13C and δ D. C. N, P, protein, lipid, and carbohydrate contents of P. noctiluca were low on a dry weight basis as compared to net zooplankton. Significantly lower C:N and C:P ratios were found in jellyfish indicating a greater loss of carbon relative to nitrogen and phosphorus along the passage to a higher trophic level. Isotopic and biochemical evidence indicate that, though collected in nearshore waters, P. noctiluca depended on autochthonous marine organic matter.

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • A. Malej
    • 1
  • J. Faganeli
    • 1
  • J. Pezdič
    • 2
  1. 1.Marine Biological Station Piran, Institute of BiologyUniversity of LjubljanaPiranSlovenia
  2. 2.J. Stefan InstituteLjubljanaSlovenia

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