Temporal dietary shift in jellyfish revealed by stable isotope analysis.

Javidpour, Jamileh, Cipriano-Maack, Ashlie N., Mittermayr, Agnes and Dierking, Jan (2016) Temporal dietary shift in jellyfish revealed by stable isotope analysis. Open Access Marine Biology, 163 (5, 112). pp. 1-9. DOI 10.1007/s00227-016-2892-0.

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Abstract

A temporal change in the stable isotope (SI) composition of jellyfish in the Kiel Fjord, Western Baltic Sea, was documented by analyzing δ13C, δ15N and δ34S of bell tissue of Aurelia aurita and Cyanea capillata in the period between June and October 2011. A strong and significant temporal change in all SI values of A. aurita was found, including an increase of ~3 ‰ in δ13C, a decrease of ~4 ‰ in δ15N and sharp decline of ~7 ‰ in δ34S. While knowledge gaps in jellyfish isotope ecology, in particular the lack of reliable trophic enrichment factors, call for a conservative interpretation of our data, observed changes in particular in δ34S, as indicated by means of a MixSIR mixing model, would be consistent with a temporal dietary shift in A. aurita from mesozooplankton (>150 µm) to microplankton and small re-suspended particles (0.8–20 µm) from the benthos. Presence of a hitherto unidentified food source not included in the model could also contribute to the shift. During the 2-month occurrence of C. capillata, its isotope composition remained stable and was consistent with a mainly mesozooplanktonic diet. Mixing model output, mainly driven by δ34S values, indicated a lower proportion of A. aurita in the diet of C. capillata than previously reported, and thus to a potentially lesser importance of intraguild predation among jellyfish in the Kiel Fjord. Overall, our results clearly highlighted the potential for substantial intraspecific isotopic seasonal variation in jellyfish, which should be taken into account in future feeding ecology studies on this group.

Document Type: Article
Additional Information: WOS:000375330500019
Keywords: R.V. Polarfuchs
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Evolutionary Ecology of Marine Fishes
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > The Future Ocean - Cluster of Excellence > FO-R03
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s00227-016-2892-0
ISSN: 0025-3162
Projects: Future Ocean, BONUS BIO-C3
Date Deposited: 27 Apr 2016 09:04
Last Modified: 19 Dec 2017 12:47
URI: http://oceanrep.geomar.de/id/eprint/32169

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