Realm: Marine
Climate: Polar/Temperate
Biome: Multiple ecoregions
Central latitude: 72.739441
Central longitude: 10.694448
Duration: 22 years, from 1921 to 1973

15016 records

402 distinct species

Across the time series Calanus finmarchicus is the most frequently occurring species

Methods

Zooplankton: 2.475 stations and 9.081 samplesZooplankton were sampled and analyzed according to standard procedures used in Russia (Bogorov. 1927. 1934. 1938. 1940). For the sampling of zooplankton. the large model of the Juday plankton net was used at standard water depths (bottom-100. 100-75. 75-50. 50-25. 25-10 and 10-0 meters). Towing on all layers was carried out from the bottom to the surface only at some stations. The Juday net has an opening diameter 37 cm. and a mesh size of 168 ?m. The sample was poured into prepared bottles and preserved with 4% neutral formalin.Sample processing included two successive operations: first. determining the sample wet weight. and second. quantitative sample processing (identification and calculation of each species. taking into account life stage and size groups). Sample wet weight was determined using a torsion balance with an accuracy of up to 0.1 mg. The counting carried out by Hensen (Manual. 1980) calculational method using the Bogorov's counting chamber. If the number of species in the counting chamber was insufficient. all species were analyzed. In other cases. large specimens were taken out of the sample. identified. calculated. and measured separately. The sample remainder was concentrated to a volume of 50-100 ml (or higher. depending on plankton abundance). Then the sample was carefully mixed and a subsample was collected with a stamp pipette (1. 2 or 5 ml depending on the capacity of the stamp pipette) and then analyzed in the Bogorov's counting chamber using a binocular microscope. Two or three similar subsamples were collected from each sample. The difference of values between subsamples should not exceeded 30%. otherwise the number of samples was increased. The obtained results were averaged. and the sample was analyzed as a whole for identification and counting of rare species. Unit of abundance = IndCountInt, Unit of biomass = NA

Citation(s)

Markhaseva, E.L., Golikov, A.A., Agapova, T.A. & Beig, A.A. (1985) Archives of the Arctic Seas Zooplankton. Available at: http://www.iobis.org/mapper/?dataset=4470, accessed 2012.