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The physiological response of Northern Krill (Meganyctiphanes norvegica) to temperature gradients in the Kattegat Saborowski, R.; Salomon, M.; Buchholz, F. (2000). The physiological response of Northern Krill (Meganyctiphanes norvegica) to temperature gradients in the Kattegat, in: Liebezeit, G. et al. Life at Interfaces and Under Extreme Conditions: Proceedings of the 33rd European Marine Biology Symposium, Wilhelmshaven, Germany, 7-11 September 1998. Developments in Hydrobiology, 151: pp. 157-160. https://dx.doi.org/10.1007/978-94-011-4148-2_14 In: Liebezeit, G.; Dittmann, S.; Kröncke, I. (Ed.) (2000). Life at interfaces and under extreme conditions: Proceedings of the 33rd European Marine Biology Symposium, Wilhelmshaven, Germany, 7-11 September 1998. European Marine Biology Symposia, 33. Developments in Hydrobiology, 151. ISBN 978-0-7923-6468-9; e-ISBN 978-94-011-4148-2. VII, 210 pp. https://dx.doi.org/10.1007/978-94-011-4148-2, meer In: European Marine Biology Symposia., meer Is gerelateerd aan: Saborowski, R.; Salomon, M.; Buchholz, F. (2000). The physiological response of Northern Krill (Meganyctiphanes norvegica) to temperature gradients in the Kattegat. Hydrobiologia 426: 157-160. https://dx.doi.org/10.1023/A:1003974613473, meer

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Documenttype: Congresbijdrage

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Trefwoorden

Behaviour > Migrations > Vertical migrations Temperature gradients Meganyctiphanes norvegica (M. Sars, 1857) [WoRMS] ANE, Kattegat [Marine Regions] Marien/Kust

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Saborowski, R. Salomon, M. Buchholz, F., meer

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Abstract

The Alkor-Deep (140 m), which forms part of a depression system in the northern Kattegat channel east of the island of Laeso (Denmark), is the location of a self sustaining population of Northern krill, Meganyctiphanes norvegica (Euphausiacea). This population is exposed to one of the most pronounced thermal gradients within the distributional range of this pelagic crustacean. During summer, the temperature of the water column ranges between 4 and 6 in the deep to 16 °C near the surface which results in the krill being exposed to temperature differences of 8-10 °C during diel vertical migration. Oxygen consumption rates were used to investigate the physiological adaptation of the animal to such gradients in temperature. The rates were found to increase exponentially from 31 µmol O2 h-1 g(dw)-1 at 4 °C to 72 µmol O2 h-1 g(dw)-1 at 16 °C, giving a Q10value of 2.0, and indicating that physiological adaptation to varying thermal conditions does not take place. Behavioural adaptations are discussed which may help the krill to cope with large temperature gradients in their environment.

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