Seasonal and Regional Variation in the Pelagial and its Relationship to the Life History Cycle of Krill

  • V. Smetacek
  • R. Scharek
  • E.-M. Nöthig

Summary

The earlier concept of Antarctic pelagic seasonality has changed drastically. We now know that the characteristic pelagic community resembles the oligotrophic communities of warm, nutrient-depleted waters. Results of recent sediment trap moorings show that the Antarctic oceanic pelagial behaves as a highly efficient retention system as losses due to sinking particles are exceptionally low. We show that the distinction into “new” and “regenerating” type pelagic systems only applies to restricted regions experiencing sizeable blooms where spring sedimentation pulses have been recorded. Apparently, community biomass is built up by channelling of nitrate into the recycling pool whereby balance between auto- and heterotrophs must be maintained, presumably within time scales of weeks. Interannual variability is likely to be much less pronounced in this type of buffered pelagic system.

In vast areas of the Southern Ocean, algal biomass is low but that of grazers comparatively high. We argue that Antarctic zooplankton, particularly the dominant copepods, are efficiently geared to the pelagic system overlying the deep ocean and maintain sizeable, stable stocks that undergo minor winter decline. The same is true for krill (Euphausia superba) but this animal is large enough to exploit the Antarctic pelagial in an unique way. It retreats to the ice undersurface during the long winter and feeds with high efficiency on plankton concentrations following ice melt. Apparently, krill has geared its life cycle to oceanic circulation patterns, including that of the ice, in a way that maximizes seasonal and regional exploitation of food resources. Adaptation to the rugged ice undersurface is probably the most important factor enabling maintenance of an uniquely large monospecific stock of planktivores in a low productive ocean. The concept of ice as a hostile habitat must be revised; rather than posing a problem for survival, it provides the answer to the age-old riddle of high animal biomass in an icy environment.

Keywords

Biomass Phytoplankton Sedimentation Shrinkage Microbe 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • V. Smetacek
  • R. Scharek
  • E.-M. Nöthig
    • 1
  1. 1.Alfred-Wegener-Institut für Polar- und MeeresforschungBremerhavenGermany

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