Stage-specific habitats of Calanus finmarchicus and Calanus helgolandicus in a stratified northern Norwegian fjord

Skreslet, Stig; Olsen, Ketil; Mohus, Å.; Tande, Kurt S.

doi:10.1006/jmsc.2000.0968

Cited by 18 publications

(23 citation statements)

References 13 publications

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“…A series of sibling species from the genera Onisimus and Anonyx indicates that not only do the juveniles of each species live in shallower waters than adults do, but that smaller species also live in shallower waters than larger ones do (Węsławski 1990, Węsławski andLegeżyńska (2002). Similar phenomenon was observed among developmental stages of Calanus copepods (Skreslet et al 2000).…”

Section: Discussionsupporting

confidence: 85%

Hidden diversity in Arctic crustaceans. How many roles can a species play?

Węsławski¹,

Opanowski²,

Legeżyńska³

et al. 2010

Polish Polar Research

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Abstract:The life modes and sizes of 98 species of higher crustaceans (Malacostraca) from Hornsund and Kongsfjorden (Svalbard fjords) were analyzed. The majority (90%) of the species were perennial, K strategists, with eight− to tenfold size differences between newborn and adult specimens. The largest species are carnivores and carrion feeders, while the smallest are sediment−dwelling suspension and deposit feeders. Compared with the crustacean fauna of northern Norway (over 500 species), the Svalbard fjord crustacean fauna is less diverse (below 150 species). The crustacean species populations from the Arctic fjord are more numerous (average number of ind./species/m 2 ) compared to those of the northern Norway boreal fjords. Crustaceans with long life cycles and distinct size dif− ference between juveniles and adults represent three to five ecologically different func− tional "species" each, since the smaller size groups of the same species differ with regard to their mobility, food and habitat use. Thus, crustaceans are ecologically and functionally more diverse than expected from simple species count.

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Section: Discussionsupporting

confidence: 85%

Hidden diversity in Arctic crustaceans. How many roles can a species play?

Węsławski¹,

Opanowski²,

Legeżyńska³

et al. 2010

Polish Polar Research

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“…The copepod C. finmarchicus is a known natural dietary item for saithe (Nedreaas 1987). C. finmarchicus is known to be abundant in the fjord systems during the summer when the study was performed (Skreslet, Olsen, Mohus & Tande 2000). Other natural prey for saithe, such as juvenile fish, was only found in the guts of saithe from Saltfjord.…”

Section: Discussionmentioning

confidence: 99%

Salmon farming affects the fatty acid composition and taste of wild saithe Pollachius virens L.

Skog

Hylland

Torstensen³

et al. 2003

Aquaculture Research

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There is an ongoing controversy on whether ¢sh farming a¡ects the quality of wild ¢sh in fjords. In northern Norway, local people prefer not to eat saithe, Pollachius virens L., from areas in the vicinity of ¢sh farms because they say the taste is inferior to saithe from other areas. To address this issue, saithe were collected in the vicinity of a salmon ¢sh farm in a fjord in northern Norway and in two reference areas: one site 6 km away from the nearest ¢sh farm in the same fjord, and the other in a fjord nearby with no ¢sh farms. The objective of this study was to clarify whether the physiology or taste of saithe near ¢sh farms di¡ers from saithe in areas with no or limited in£uence from ¢sh farms. The ¢sh collected near farms were larger than those from control sites of the same age and had been eating pellets. Analysis of fatty acid composition of the ¢llet indicated that ¢sh collected near the farms had fatty acid pro¢les that resembled that of pellets more than ¢sh from reference sites. The results suggest that there were individual di¡erences in the time spent near cages for saithe collected near the farm, and that saithe collected at the reference area in the same fjord had also been eating pellets, i.e. had visited at least one of the ¢sh farms in the fjord. In a sensory test, the test panel found that saithe from the fjord without ¢sh farms tasted better than saithe collected near the cages. The test panel found no clear di¡erences in taste between saithe collected near the ¢sh farm and saithe from the same fjord, but 6 km from the nearest ¢sh farm.

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“…Fjords along the mid-Norwegian Shelf serve as habitats for reproducing C. finmarchicus in April (Sømme, 1934;Strømgren, 1976;Skreslet and Rød, 1986;Skreslet et al, 2000). In May, the first generation has developed mainly into CIVs and CVs that may be observed in swarms that ripple the surface film at noon on calm, sunny days (unpublished data).…”

Section: Discussionmentioning

confidence: 94%

“…Their behaviour possibly exposes them to UVR-induced effects. This spring generation leaves the fjords, probably by flushing of freshwater outflow (Strømgren, 1976) that normally starts in MayeJune and lasts for a month or two (Skreslet, 1976;Skreslet et al, 2000). This first generation possibly matures into adults and occupies the NCC reproduction habitat in Junee August.…”

Section: Discussionmentioning

confidence: 97%

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

Skreslet¹,

Borja

Bugliaro

et al. 2005

ICES Journal of Marine Science

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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.

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Stage-specific habitats of Calanus finmarchicus and Calanus helgolandicus in a stratified northern Norwegian fjord

Cited by 18 publications

References 13 publications

Hidden diversity in Arctic crustaceans. How many roles can a species play?

Hidden diversity in Arctic crustaceans. How many roles can a species play?

Salmon farming affects the fatty acid composition and taste of wild saithe Pollachius virens L.

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

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