The Davis Strait - DCE - Nationalt Center for Miljø og Energi
The Davis Strait - DCE - Nationalt Center for Miljø og Energi
The Davis Strait - DCE - Nationalt Center for Miljø og Energi
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Figure 4.2.5. Juvenile polar cod<br />
(Bore<strong>og</strong>adus saida) abundance<br />
(N m -2 ). <strong>The</strong> coloured dots represent<br />
abundance values from<br />
different studies; red, blue and<br />
dark grey dots: from surveys in<br />
May-July 1996-2000 (Munk et al.<br />
2000, Munk et al. 2003, Munk<br />
pers. comm. and REKPRO-data<br />
from C. Simonsen and S.A.<br />
Pedersen pers. comm.). <strong>The</strong><br />
juvenile polar cod from different<br />
studies in summer and an autumn<br />
period all indicate relatively<br />
high abundance in the coastal<br />
areas and east and west of the<br />
fishery banks.<br />
72<br />
66°N<br />
64°N<br />
60°W<br />
60°W<br />
Larvae, Polar cod<br />
(Bore<strong>og</strong>adus saida)<br />
Survey period<br />
! May 2000<br />
! July 2000<br />
62°N<br />
June 1999<br />
Abundance (N m -2 )<br />
# No observations<br />
! 0.001- 0.005<br />
! 0.005 - 0.05<br />
! 0.05 - 0.5<br />
! 0.5 - 1<br />
! 1 - 1.5<br />
! 1.5 - 2.2<br />
Assessment area<br />
0 75 150 Km<br />
60°N<br />
4.2.6 Knowledge gaps<br />
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55°W<br />
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Variability in the physical <strong>for</strong>cing of the Atlantic inflow and the freshwater<br />
runoff from ice sheets determines the physical gradients and thereby the ge<strong>og</strong>raphical<br />
distribution of the plankton communities. <strong>The</strong> dynamics between<br />
the physical environment and the variability in the fishery resources in West<br />
Greenland waters are not fully understood. Thus, a better understanding on<br />
the recruitment success of fish and shellfish requires comparative studies of<br />
zooplankton, fish larvae, hydr<strong>og</strong>raphy and climate, from inshore to offshore<br />
areas. <strong>The</strong> exact mechanisms determining plankton community distribution<br />
and the specific adaptations of these communities to physical and chemical<br />
gradients are still unknown. To date, no annual surveys have been conducted<br />
on primary and zooplankton production with the hydr<strong>og</strong>raphy in the assessment<br />
area (except at the mouth of Godthåbsfjorden, in: Arendt et al.<br />
2010). If addressed, model predictions which include variability in ocean<br />
temperature, seasonal timing of food and production, spawning stock biomass,<br />
larval drift, species interactions (cannibalism), <strong>for</strong> each individual in<br />
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55°W<br />
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50°W<br />
50°W<br />
68°N<br />
66°N<br />
64°N<br />
62°N
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