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Marine Biology

, Volume 160, Issue 1, pp 241–248 | Cite as

Feeding in Arctic darkness: mid-winter diet of the pelagic amphipods Themisto abyssorum and T. libellula

  • Angelina Kraft
  • Jørgen Berge
  • Øystein Varpe
  • Stig Falk-Petersen
Short Communication

Abstract

The pelagic amphipods Themisto abyssorum and Themisto libellula represent important links between the herbivore zooplankton community and higher trophic levels of the Arctic marine food webs. Large double structured eyes of both of these hyperiid species are assumed to be used for visual prey detection. However, no information is available on the feeding strategies of these visually searching predators for the period of the polar night, a time of year with no or very low levels of daylight. Here, we report on the stomach and gut content of both Themisto species collected during a January expedition around Svalbard (78° to 81°N). Results indicate that T. abyssorum and T. libellula feed actively during the Arctic winter. The major food source of both amphipods consisted of calanoid copepods, most frequently Calanus finmarchicus.

Keywords

Fecal Pellet Calanoid Copepod Total Body Length Polar Night Herbivore Zooplankton 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We greatly acknowledge Captain Hans Hanssen and the crew of the R/V Helmer Hanssen for their skillful work and support during the ARCTOS Marine ecological research cruise in January 2012. We thank Anette Wold, Clare Webster, Jordan Grigor and Malin Daase for their help with the sample processing on board. We acknowledge Angus Atkinson and two anonymous referees who greatly improved the original version of the manuscript. We also thank Gerhard Dieckmann for his valuable suggestions and proof reading. This work was partly financed by the Norwegian Research Council through the Circa Project.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Angelina Kraft
    • 1
  • Jørgen Berge
    • 2
    • 4
  • Øystein Varpe
    • 3
    • 5
  • Stig Falk-Petersen
    • 3
    • 4
  1. 1.Alfred Wegener Institute for Polar and Marine ResearchBremerhavenGermany
  2. 2.University Centre in SvalbardLongyearbyenNorway
  3. 3.Norwegian Polar InstituteTromsøNorway
  4. 4.Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and EconomicsUniversity of TromsøTromsøNorway
  5. 5.Akvaplan-nivaTromsøNorway

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