UDC

681.518

DOI

10.17238/issn2541-8416.2018.18.1.28

Authors

VG Dvoretsky¹, AG Dvoretsky¹
1 Murmansk Marine Biological Institute, Kola Scientific Centre of Russian Academy of Sciences (Murmansk, Russian Federation)

Abstract

The Barents Sea is a highly productive shelf region. Zooplankton assemblages are a key component of the carbon cycle in Arctic marine ecosystems; they transfer energy from lower trophic levels to higher levels, including larval and young commercial fish. The winter state of the zooplankton community in the Central Through and their slopes (Barents Sea) was investigated in late November 2010. Vertical structure of water layer was characterised by pycnocline located below 80 m. The upper strata were occupied by transformed Atlantic Water, while winter Barents Sea Water with negative temperatures was in the bottom strata. Total zooplankton abundance varied from 162 to 1214 individuals/m3. Biomass ranged from 88 to 799 mg wet mass/m³. Copepods dominated in terms of total zooplankton abundance (average 99%) and biomass (92%). Maximum densities of Calanus finmarchicus and Calanus glacialis were registered in the frontal zone separating warm and cold water masses. Abundances of Metridia longa and O. similis were highest in cold waters. Three groups of stations differing in terms of the common copepod composition were delineated with cluster analysis. The age structure of Calanus finmarchicus and Metridia longa was characterised by a prevalence of copepodites IV–V. Total zooplankton abundance and biomass were correlated to water temperature and salinity, suggesting that hydrological conditions were the key driver of spatial variations of the zooplankton communities. High biomass of large copepods suggests potential significance of the investigated region for feeding of young and adult fish.

Keywords

Plankton, copepods, pelagic ecosystem, Arctic shelf

References

1. Anonymous (1971) Instruktsiya po sboru i obrabotke planktona [Manual to collecting and treatment of plankton]. VNIRO, Moscow, 82 pp.
2. Anonymous (2004) Climatic atlas of the Arctic Seas 2004: Part I. Database of the Barents, Kara, Laptev, and White Seas – Oceanography and Marine Biology. NOAA Atlas NESDIS 58. US Government Printing Office, Washington, 148 pp.
3. Anonymous (2011) Kompleksnye issledovaniya bol’shikh morskikh ekosistem Rossii [Integrated investigations of the Russian Large Marine Ecosystems]. Kola Science Russian Academy of Sciences Press, Apatity, 516 pp.
4. Anonyous (2012) Sostoyanie biologicheskikh syr’evykh resursov Barentseva morya i Severnoi Atlantiki v 2012 g. [Status of biological living resources of the Barents Sea and North Atlantic in 2012]. PINRO Press, Murmansk, 123 pp.
5. Blachowiak-Samolyk K, Søreide JE, Kwasniewski S, Sundfjord A, Hop H, Falk-Petersen S, Hegseth EN (2008) Hydrodynamic control of mesozooplankton abundance and biomass in northern Svalbard waters (79–81ºN). Deep-Sea Research Part II 55: 2210–2224. https://doi.org/10.1016/j. dsr 2.2008.05.018
6. Bogorov VG (1974) Plankton Mirovogo okeana [Plankton of the World Ocean]. Nauka, Moscow, 320 pp.
7. Bray RJ, Curtis JT (1957) An ordination of the upland forest communities of southern Wisconsin. Ecological Monographs 27: 325–349. https://doi.org/10.2307/1942268
8. Dvoretsky VG, Dvoretsky AG (2013) Zimnii zooplankton yugo-zapadnoi chasti Barentseva morya (mart 2007 g.) [Winter zooplankton from the south-western Barents Sea (March 2007)]. Rybnoe khozyaystvo 2: 74–78.
9. Dvoretsky VG, Dvoretsky AG (2014) The biodiversity of zooplankton communities of the West Arctic seas. Russian Journal of Marine Biology 40: 95–99. https://doi.org/10.1134/S1063074014020035
10. Dvoretsky VG, Dvoretsky AG (2015a) Ekologiya zooplanktonnykh soobshchestv Barentseva morya i sopredel’nykh vod [Ecology of zooplankton communities in the Barents Sea and adjacent waters]. Renome Press, St. Petersburg, 736 pp.
11. Dvoretsky VG, Dvoretsky AG (2015b) Early winter mesozooplankton of the coastal south-eastern Barents Sea. Estuarine, Coastal and Shelf Science 152: 116–123. https://doi.org/10.1016/j.ecss.2014.11.016
12. Falk-Petersen S, Timofeev S, Pavlov V, Sargent JR (2007) Climate variability and pos-sible effects on arctic food chains: The role of Calanus. Arctic Alpine Ecosystems and People in a Changing Environment. Springer Verlag, Berlin, 147–166. https://doi.org/10.1007/978-3-540-48514-8_9
13. Fomin OK (1978) Nekotorye dinamicheskie kharakteristiki zooplanktona v pribrezh’e Murmana [Some dynamic features of zooplankton of Murmansk coast]. Zakonomernosti bioproduktsionnykh protsessov v Barentsevom more [Regularities of bio-production processes in the Barents Sea] Kola Science Russian Academy of Sciences Press, Apatity, 72–91.
14. Haq SM (1967) Nutritional physiology of Metridia lucens and M. longa from the Gulf of Maine. Limnology and Oceanography 12(1): 40–51. https://doi.org/10.4319/lo.1967.12.1.0040
15. Matishov GG, Dzhenyuk SL, Denisov VV, Zhichkin AP, Moiseev DV (2012) Climate and oceanographic processes in the Barents Sea. Ber. Polarforsch. 640: 63–73.
16. Nesterova VN (1990) Biomassa planktona na putyakh dreifa lichinok treski (spravochnyi material). [Plankton biomass along the drift routes of cod larvae (reference material)]. PINRO Press, Murmansk 64 pp.
17. Olsen E, Aanes S, Mehl S, Holst JC, Aglen A, Gjøsæter H (2010) Cod, haddock, saithe, herring, and capelin in the Barents Sea and adjacent waters: a review of the biological value of the area. ICES Journal of Marine Science 67: 87–101. https://doi.org/10.1093/icesjms/fsp229
18. Timofeev SF (2000) Ekologiya morskogo zooplanktona [Ecology of the marine zooplankton]. MGPI Press, Murmansk, 216 pp.
19. Wassmann P, Reigstad M, Haug T, Rudels B, Carroll ML, Hop H, Gabrielsen GW, Falk-Petersen S, Denisenko SG, Arashkevich E, Slagstad D (2006) Food webs and carbon flux in the Barents Sea. Progress in Oceanography 71: 232–287. https://doi.org/10.1016/j.pocean.2006.10.003
20. Zar JH (1999) Biostatistical analysis (4th edn). Prentice-Hall, Inc., New Jersey, 931 pp.