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Impact of grazin from capelin (Mallotus villosus) on zooplankton: a case study in the northern Barents Sea in August 1985

Hassel, Arne; Skjoldal, Hein Rune; Gjøsæter, Harald; Loeng, Harald; Omli, Lena
Working paper
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URI
http://hdl.handle.net/11250/104932
Date
1991
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  • ICES CM documents authored by IMR scientists (1949-2011) [3138]
Original version
This report is not to be cited without prior reference to the authors  
Abstract
The distribution of capelin was mapped in the area east of Hopen.

Zooplankton was sampled with Juday net and 1m^2 MOCNESS sampler,

and analyzed with respect to hydrography and capelin abundance. The

capelin "front" coincided more or less with the physical polar front, and

this complicated the interpretation of the results. Strong indications

for a grazing impact by capelin on zooplankton were nevertheless

obtained. The zooplankton biomass was significantly lower in the area

with high abundance of capelin than in the area with no capelin. This

effect was due to a lower biomass of relatively large zooplankton

(>1 mm size fraction) and seen most clearly in data obtained with

MOCNESS. The biomass of zooplankton in the upper 100 m was very low

where capelin was present, suggesting rapid depletion of the major

prey items. The biomass (m^2) of capelin in the capelin front area was

about 3 times higher than the biomass of zooplankton in areas without

capelin. The capelin front would therefore have the potential to graze

down the available prey in 3-4 days. Light seems to be an important

factor for the predation impact by capelin, resulting in strong

interactions between capelin predation and zooplankton vertical

distribution.
Publisher
ICES
Series
ICES CM Documents;1991/L:62

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