Some effects of ultraviolet radiation and climate on the reproduction of Calanus finmarchicus (Copepoda) and year class formation in Arcto-Norwegian cod (Gadus morhua)

Zooplankton sampling in 1997 identified the frontal zone of the Norwegian Coastal Current as a reproduction habitat for Calanus finmarchicus in June–August. This area is subject to considerable ultraviolet radiation (UVR), as calculated from satellite observations of ozone and cloudiness. While in s...

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Published in:ICES journal of marine science Vol. 62; no. 7; pp. 1293 - 1300
Main Authors: Skreslet, Stig, Borja, Angel, Bugliaro, Luca, Hansen, Georg, Meerkötter, Ralf, Olsen, Ketil, Verdebout, Jean
Format: Journal Article
Language:English
Published: Oxford University Press 01.10.2005
Subjects:
bacteria
Calanus finmarchicus
climate
freshwater
Gadus morhua
Marine
Norwegian Coastal Current
radiation
recruitment
trophodynamics
Atlantic, Norwegian Coastal Current
ANE, Norway, Nordland, Lofoten Is
ANE, Atlantic, Norwegian Coastal Current
UV
bacteria
radiation
recruitment
climate
freshwater
Norwegian Coastal Current
trophodynamics
ISSN:1054-3139, 1095-9289
Online Access:Get full text
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Summary:Zooplankton sampling in 1997 identified the frontal zone of the Norwegian Coastal Current as a reproduction habitat for Calanus finmarchicus in June–August. This area is subject to considerable ultraviolet radiation (UVR), as calculated from satellite observations of ozone and cloudiness. While in situ experiments indicated UVR-induced mortality in reproducing C. finmarchicus, monthly UVR doses during the actual reproduction period did not appear to affect the abundance of the resulting generation of adolescent copepodites (CIV-V) that accumulated in a fjord habitat during October 1983–2000. Local UVR in the spawning grounds of Arcto-Norwegian cod at the Lofoten Islands in March–May was positively correlated with the stock's 0-group index, which resulted in the rejection of the hypothesis that local UVR leads to high mortality of cod eggs or reduces the abundance of prey for cod larvae. Rather, the result suggests an indirect positive effect of UVR on the survival of cod eggs and larvae, possibly by controlling harmful microbes.
Bibliography:istex:2C5F93EC2EAF9F13606A482400883F05FB4DE86B
ark:/67375/HXZ-HDKDFV22-C
Present address: EC-JRC Institute for Health and Consumer Protection, Ispra, Italy.
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ISSN:1054-3139
1095-9289
DOI:10.1016/j.icesjms.2005.05.019