e. gaard, h. debes, b. hansen, h. hátún, k. m. h. larsen faroe marine research institute
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/1.jpg)
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. LarsenFaroe 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
![Page 2: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/2.jpg)
Nordic Seas
![Page 3: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/3.jpg)
Content
• Variability:
– North of the Faroes • Warm Atlantic • Cold East Icelandic current water
– Outside the shelf front
– On the Faroe shelf
![Page 4: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/4.jpg)
North of the Faroes
![Page 5: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/5.jpg)
Copepod life cycle
![Page 6: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/6.jpg)
Calanus life cycle
![Page 7: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/7.jpg)
Calanus finmarchicusMay 1993-2009
![Page 8: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/8.jpg)
Chlorophyll aMay 1993-2009
![Page 9: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/9.jpg)
TemperatureAnnual mean
N1
N14
![Page 10: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/10.jpg)
The Faroe Shelf Ecosystem
• Separate water mass
• Distinct ecosystem
• Largely neritic zooplankton.
• Mixed with variable abundances of oceanic zooplankton
![Page 11: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/11.jpg)
Copepods on and around the Faroe shelf19-27 June 2009
Copepods
Calanus finmarchicus
![Page 12: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/12.jpg)
Zooplankton monitoringLate June
< 100 m bottom depthZooplankton biomass
> 150 m bottom depthZooplankton biomass
M icroscopic examinations (Shelf)
M icroscopic examinations (Outside she lf)
![Page 13: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/13.jpg)
Zooplankton dry weight (g/m2)Outside the shelf, late June
![Page 14: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/14.jpg)
Outside the shelf front, late June
Zooplankton biomass
Calanus finmarchicusStage composition
Calanus finmarchicusRelative stage composition
![Page 15: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/15.jpg)
Faroe Self copepodsSeasonal development, 2004
![Page 16: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/16.jpg)
Zooplankton dry weight (g/m2)Shelf and Outside the shelf, late June
![Page 17: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/17.jpg)
Faroe shelfLate June, 1992-2009
Copepods Calanus finmarchicus
Temora: 10 X increase
![Page 18: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/18.jpg)
Shelf temperature and chl. a
Chl. a: 15 April - 30 June
Temperature Mean, 15 April – 30 June
![Page 19: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/19.jpg)
Calanus finmarchicusStage duration
5°C
8°C
7°C
![Page 20: E. Gaard, H. Debes, B. Hansen, H. Hátún, K. M. H. Larsen Faroe Marine Research Institute](https://reader038.vdocument.in/reader038/viewer/2022110212/56813eda550346895da94c71/html5/thumbnails/20.jpg)
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