Interannual correlation between hemispheric climate and northern Norwegian wintering stocks of two Calanus spp. ...

• Main Authors: Skreslet, Stig, Borja, Angel
• Format: Report
• Language: unknown
• Published: ICES MSS Vol.219 - Hydrobiological variability in the ICES Area, 1990-1999 2023
• Subjects: Fisheries and aquaculture; Norwegian Sea ICES Ecoregion; Greater North Sea ICES Ecoregion; Arctic; Norway; Norwegian Sea; Calanus finmarchicus; Calanus hyperboreus; North Atlantic; North Atlantic oscillation; Northeast Atlantic
• Online Access: https://dx.doi.org/10.17895/ices.pub.19271921; https://ices-library.figshare.com/articles/report/Interannual_correlation_between_hemispheric_climate_and_northern_Norwegian_wintering_stocks_of_two_Calanus_spp_/19271921

Calanus finmarchicus and Calanus hyperboreus were sampled by five replicate Juday net tows from bottom to surface in February and October 1983-2000 in two deep fjord basins with different sill depths. C. finmarchicus was an order more abundant than C. hyperboreus in both fjords. Seasonal stock changes probably expressed the difference between rates of mortality and immigration. The interannual variability in abundance was about an order of magnitude. Only C. finmarchicus was positively correlated with North Atlantic Oscillation, in opposite phase with its abundance in the North Sea, possibly due to changing winds that generated latitudinal shifts in the C. finmarchicus base population of the Northeast Atlantic. However, latitudinal shifts in westerly storm tracks possibly also forced vernal river flow from Norway to regulate the neritic plankton productivity and growth in the population of C. finmarchicus. Positive correlation between Arctic Oscillation and both species may be due to forcing of advected ...