Impact of grazin from capelin (Mallotus villosus) on zooplankton: a case study in the northern Barents Sea in August 1985
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...
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ftimr:oai:imr.brage.unit.no:11250/104932 2024-09-15T17:57:58+00:00 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 1991 application/pdf http://hdl.handle.net/11250/104932 eng eng ICES ICES CM Documents;1991/L:62 This report is not to be cited without prior reference to the authors http://hdl.handle.net/11250/104932 30 s. capelin lodde zooplankton planteplankton distribution utbredelse VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Working paper 1991 ftimr 2024-07-31T03:37:25Z 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. Report Barents Sea Hopen Institute for Marine Research: Brage IMR |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
capelin lodde zooplankton planteplankton distribution utbredelse VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
spellingShingle |
capelin lodde zooplankton planteplankton distribution utbredelse VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Hassel, Arne Skjoldal, Hein Rune Gjøsæter, Harald Loeng, Harald Omli, Lena Impact of grazin from capelin (Mallotus villosus) on zooplankton: a case study in the northern Barents Sea in August 1985 |
topic_facet |
capelin lodde zooplankton planteplankton distribution utbredelse VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
description |
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. |
format |
Report |
author |
Hassel, Arne Skjoldal, Hein Rune Gjøsæter, Harald Loeng, Harald Omli, Lena |
author_facet |
Hassel, Arne Skjoldal, Hein Rune Gjøsæter, Harald Loeng, Harald Omli, Lena |
author_sort |
Hassel, Arne |
title |
Impact of grazin from capelin (Mallotus villosus) on zooplankton: a case study in the northern Barents Sea in August 1985 |
title_short |
Impact of grazin from capelin (Mallotus villosus) on zooplankton: a case study in the northern Barents Sea in August 1985 |
title_full |
Impact of grazin from capelin (Mallotus villosus) on zooplankton: a case study in the northern Barents Sea in August 1985 |
title_fullStr |
Impact of grazin from capelin (Mallotus villosus) on zooplankton: a case study in the northern Barents Sea in August 1985 |
title_full_unstemmed |
Impact of grazin from capelin (Mallotus villosus) on zooplankton: a case study in the northern Barents Sea in August 1985 |
title_sort |
impact of grazin from capelin (mallotus villosus) on zooplankton: a case study in the northern barents sea in august 1985 |
publisher |
ICES |
publishDate |
1991 |
url |
http://hdl.handle.net/11250/104932 |
genre |
Barents Sea Hopen |
genre_facet |
Barents Sea Hopen |
op_source |
30 s. |
op_relation |
ICES CM Documents;1991/L:62 This report is not to be cited without prior reference to the authors http://hdl.handle.net/11250/104932 |
_version_ |
1810434189767475200 |