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Daily changes in δ15N and δ13C stable isotopes in copepods: equilibrium dynamics and variations of trophic level in the field

Journal article
Authors Peter Tiselius
Kerstin Fransson
Published in Journal of Plankton Research
Volume 38
Issue 3
Pages 751-761
ISSN 0142-7873
Publication year 2016
Published at Department of Biological and Environmental Sciences, Kristineberg
Pages 751-761
Language en
Subject categories Marine ecology


We investigated how fast the δ15N and δ13C stable isotope signature of copepods changes and how fast the isotope signals in microzooplankton and copepods change in the field. In experiments C1, copepodites of the copepod Acartia tonsa raised on Rhodomonas baltica were switched to a diet of Oxyrrhis marina and the δ15N and δ13C signature followed for 8 days. The δ15N increased by 0.18 ± 0.03‰ day−1 in animals fed O. marina while it decreased by 0.14 ± 0.02‰ day−1 with a R. baltica diet and equilibrium was reached after 5 days. Enrichment of nitrogen 15N (Δ15N) was 2.4 ± 0.26‰ with R. baltica and 4.1 ± 0.38‰ with O. marina as food, and corresponding factors for carbon (Δ13C), 1.7 ± 0.38‰ and 2.3 ± 0.30‰. Δ15N in the field, using seston 0–10 µm as the baseline, ranged from 2.4 to 3.1 for copepods and 1.0 to 1.6 for the microzooplankton (10–90 and 90–200 µm). Nitrate input resulted in low Δ15N for copepods (2.4‰) and high for microzooplankton (1.4–1.6‰), indicating that copepods were feeding indiscriminately on phyto- and microzooplankton after the event. The second period showed higher Δ15N (3.1‰) and a higher trophic level of copepods, but lower of microzooplankton (1.0–1.1‰).

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