Composition and distribution of zooplankton in the Laptev Sea and adjacent Nansen Basin during summer, 1993

Kosobokova, Ksenia; Hanssen, H.; Hirche, Hans-Jürgen; Knickmeier, Katrin

doi:10.1007/s003000050216

Cited by 96 publications

(58 citation statements)

References 23 publications

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“…Biomass was calculated from published (Richter, 1994) and unpublished taxonspecific length-dry weight relationships, and individual dry weigths (Kosobokova et al, 1998). For rare copepod species and juvenile stages of Clione limacina at first wet weights were calculated according to length-weight regressions established by Chislenko (1968).…”

Section: Methodsmentioning

confidence: 99%

Biomass of zooplankton in the eastern Arctic Ocean – A base line study

Kosobokova

Hirche

2009

Progress in Oceanography

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There are only few historical assessments of the zooplankton biomass in the Arctic Ocean, which are difficult to compare due to methodological differences or incomplete sampling of the water column. We present assessments of the zooplankton biomass for 70 locations scattered over the Eurasian and Makarov Basins of the Arctic Ocean and analyze regional variability and factors affecting the biomass distribution. The study is based on material collected during several summer expeditions of RV Polarstern (1993-1998 and processed according to standard methods, i.e. stratified sampling of the entire water column from the bottom to the surface with very similar gear and standardized calculation of biomass. Total zooplankton biomass varied strongly from 1.9 to 23.9 g/m2 dry mass. Regional variability was related to the circulation pattern. A belt of elevated biomass along the Eurasian continental margin was related to the advection of Atlantic pelagic populations within the Arctic Ocean Boundary Current along the Siberian shelves and returning branches along mid-ocean ridges. Biomass was highest in the core of the Atlantic inflow and gradually decreased towards the shelves and basins, but also along the inflow from west to east.Lowest biomass was found in the centers of the basins north of 86°N. In the slope region, three Calanus species (C. hyperboreus, C. glacialis, C. finmarchicus) and Metridia longa contributed most to the biomass, chaetognaths were also important. In the basins, C. hyperboreus was dominant, copepods made up to 97% of total biomass. Vertical distribution was similar at all stations with biomass maxima in the upper 50 m layer except for stations near Fram Strait and northern Kara Sea, the gateways of Atlantic water to the Arctic Ocean, where maxima where between 25 and 100m. As there was only very little interannual variability of temperature and current velocity in the regions of the Atlantic inflow we speculate that the majority of our samples, which was collected in 1993 and 1995, represent the phase of the 1990s warm event in the Nordic Seas.

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Section: Methodsmentioning

confidence: 99%

Biomass of zooplankton in the eastern Arctic Ocean – A base line study

Kosobokova

Hirche

2009

Progress in Oceanography

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“…This can be considered as a relatively large contribution in comparison with other Arctic regions. For example, in the Laptev Sea O. similis accounted for 2.2 to 4.4% of the total mesozooplankton biomass during late summer (Kosobokova et al 1998, Lischka et al 2001. In Canadian Basin waters, the species averaged 1.6% (Hopcroft et al 2005).…”

Section: Environmental Factors Biomass and Prosome Length Of Oithonamentioning

confidence: 99%

Spatial variations in reproductive characteristics of the small copepod Oithona similis in the Barents Sea

Dvoretsky¹,

Dvoretsky²

2009

Mar. Ecol. Prog. Ser.

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“…In early summer, a large plume of low-saline water spreads out on top of oceanic water, extending the brackish-water region far away from the river mouths. The marine distribution of L. macrurus seems to be closely related to freshwater admixture, since it is found only rarely on the shelf break of the Laptev and Kara Seas and is absent in the Barents Sea and the Arctic Ocean proper (Kosobokova et al 1998;Kosobokova and Hirche 2000). In the light of increasing river discharge to the Arctic Ocean (Peterson et al 2002), the habitat of L. macrurus may be extended in the future.…”

Section: Introductionmentioning

confidence: 99%

Limnocalanus macrurus in the Kara Sea (Arctic Ocean): an opportunistic copepod as evident from distribution and lipid patterns

et al. 2003

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Limnocalanus macrurus is an important member of the zooplankton communities of the Siberian shelf seas. During the cruise, Boris Petrov 1999, in August/ September to the southern Kara Sea and the Ob and Yenisej estuaries, its abundance and vertical distribution were investigated. In adults, salinity tolerance, egg production, feeding and lipid composition were studied. L. macrurus occurred in water with salinities ranging from 1.7 to >33 without clear preference, as revealed from salinity-tolerance experiments. The dominance of adults and their high wax-ester content, as well as the lack of egg production and feeding activity, suggest that the population was in the pre-overwintering condition. Wax esters allow L. macrurus to survive long starvation periods and to reproduce in times of little food availability, but through its potential carnivory, it should be able to replenish its diet by preying on other zooplankton. Morphology and swimming behaviour of L. macrurus resemble the omnivorous copepod Metridia longa, which, however, is mainly found in the open ocean. The overall lipid composition and the mode of lipid storage also point to an omnivorous feeding behaviour. However, the high proportion of the marker fatty acid 16:1(n-7) suggests that L. macrurus strongly exploited the existent phytoplankton bloom, consisting mainly of diatoms. A striking characteristic of its lipids is the high level of the 20:1(n-7) fatty alcohol in addition to the 18:1(n-7) fatty acid and alcohol. It is the first copepod species known to produce such high amounts of 20:1(n-7) alcohol. Since this alcohol and the corresponding fatty acid are not abundant in any prey, this long-chain monounsaturated wax-ester moiety has to be produced de novo. Owing to these particular lipid characteristics in its distribution, feeding, and life-cycle strategy, L. macrurus can be described as a very versatile and opportunistic copepod.

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Composition and distribution of zooplankton in the Laptev Sea and adjacent Nansen Basin during summer, 1993

Cited by 96 publications

References 23 publications

Biomass of zooplankton in the eastern Arctic Ocean – A base line study

Biomass of zooplankton in the eastern Arctic Ocean – A base line study

Spatial variations in reproductive characteristics of the small copepod Oithona similis in the Barents Sea

Limnocalanus macrurus in the Kara Sea (Arctic Ocean): an opportunistic copepod as evident from distribution and lipid patterns

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