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Hydrobiologia

, Volume 426, Issue 1, pp 157–160 | Cite as

The physiological response of Northern krill (Meganyctiphanes norvegica) to temperature gradients in the Kattegat

  • Reinhard Saborowski
  • Markus Salomon
  • Friedrich Buchholz
Article

Abstract

The Alkor-Deep (140 m), which forms part of a depression system in the northern Kattegat channel east of the island of Læsø (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 gdw-1 at 4 °C to 72 μmol O2 h-1 gdw-1 at 16 °C, giving a Q10-value 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.

Meganyctiphanes norvegica respiration temperature vertical migration Kattegat 

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Reinhard Saborowski
    • 1
  • Markus Salomon
    • 2
  • Friedrich Buchholz
    • 2
  1. 1.Biologische Anstalt Helgoland-AWI, MeeresstationHelgolandGermany
  2. 2.Biologische Anstalt Helgoland-AWI, MeeresstationHelgolandGermany

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