Trophic position of Calanus finmarchicus (Copepoda, Calanoida) in the Trondheim Fjord.

Saage, Andrea, Altin, D., Vadstein, O. and Sommer, Ulrich (2008) Trophic position of Calanus finmarchicus (Copepoda, Calanoida) in the Trondheim Fjord. Journal of Sea Research, 59 . pp. 162-172. DOI 10.1016/j.seares.2007.12.003.

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Abstract

The trophic position of Calanus finmarchicus in the Trondheim Fjord in 2004 was determined through stable isotope analyses. Wild specimens were sampled monthly in the fjord and δ13C and δ15N signatures of the developmental stages from CIII to adults were measured. There were statistically significant differences in the δ13C and δ15N signatures of three identified groups: overwintered parental generation, developing new generation and new generation preparing for overwintering. C. finmarchicus individuals raised in a laboratory on a pure algal diet (Dunaliella tertiolecta and Isochrysis galbana) provided stable isotope signatures for purely herbivorous copepods. With these signatures as comparison, the trophic position of C. finmarchicus in the Trondheim Fjord in 2004 was determined as trophic level 2.4, thus indicating omnivory under natural conditions. Additionally, our data suggest that seasonal differences in the δ13C signatures of C. finmarchicus are due to the varying lipid content of the different developmental stages.

Document Type: Article
Keywords: Calanus; Trophic Position; Stable Isotopes; Copepods
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.seares.2007.12.003
ISSN: 1385-1101
Date Deposited: 03 Dec 2008 16:50
Last Modified: 19 Jul 2017 07:52
URI: http://oceanrep.geomar.de/id/eprint/6853

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