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E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute

Zooplankton variability on the Faroe Shelf and in the surrounding oceanic area in relation to phytoplankton and physical conditions. E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute.

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E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute

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  1. Zooplankton variability on the Faroe Shelf and in the surrounding oceanic area in relation to phytoplankton and physical conditions E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute ICES/NAFO Symposium on the Variability of the North Atlantic and its Marine Ecosystems during 2000-2009. Santander, Spain, 10-12 May 2011

  2. Nordic Seas

  3. Content • Variability: • North of the Faroes • Warm Atlantic • Cold East Icelandic current water • Outside the shelf front • On the Faroe shelf

  4. North of the Faroes

  5. Copepod life cycle

  6. Calanus life cycle

  7. Calanus finmarchicusMay 1993-2009

  8. Chlorophyll aMay 1993-2009

  9. TemperatureAnnualmean

  10. The Faroe Shelf Ecosystem • Separate water mass • Distinct ecosystem • Largely neritic zooplankton. • Mixed with variable abundances of oceanic zooplankton

  11. Copepods on and around the Faroe shelf19-27 June 2009 Copepods Calanus finmarchicus

  12. Zooplankton monitoringLate June

  13. Zooplankton dry weight (g/m2)Outside the shelf, late June

  14. Outside the shelf front, late June Zooplankton biomass Calanus finmarchicus Stage composition Calanus finmarchicus Relative stage composition

  15. Faroe Self copepodsSeasonal development, 2004

  16. Zooplankton dry weight (g/m2)Shelf and Outside the shelf, late June

  17. Faroe shelfLate June, 1992-2009 Copepods Calanus finmarchicus Temora: 10 X increase

  18. Shelf temperature and chl. a Chl. a: 15 April - 30 June Temperature Mean, 15 April – 30 June

  19. Calanus finmarchicusStage duration 5°C 7°C 8°C

  20. Summary • Atlantic and shelf water: • 10x increase in Temora (shelf), 1995-2009 • Zooplankton biomass increase (C. finmarchicus) during the 2000s • Phenology changes. • No relationship with chlorophyll a. • Shorter stage duration induced by higher temperature (~1°C) only shortherns the generation time ~1 weak. • East-Icelandic current water: • Large phenology shift in 2003-2004. Earlier reproduction. • No relationship with chlorophyll a • Most like caused by temperature increase and/or changes in currents

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