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.
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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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Communicated by A. Atkinson.
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Kraft, A., Berge, J., Varpe, Ø. et al. Feeding in Arctic darkness: mid-winter diet of the pelagic amphipods Themisto abyssorum and T. libellula . Mar Biol 160, 241–248 (2013). https://doi.org/10.1007/s00227-012-2065-8
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DOI: https://doi.org/10.1007/s00227-012-2065-8