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Structural and Functional Characteristics of Zooplankton in the Ob Estuary and Adjacent Shelf Areas of the Kara Sea in Summer

  • MARINE BIOLOGY
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Abstract

The study was carried out in the Ob estuary and the adjacent shelf of the Kara Sea in July 2016. For the first time data on the species composition, abundance and distribution as well as on feeding of zooplankton were obtained during the period of intensive river runoff. The biomass of zooplankton in terms of wet weight (without jelly animals and chaetognaths) varied over a wide range from 40 to 1880 mg/m3. The biomass was dominaned by the Limnocalanus macrurus population, represented by all age stages, and Pseudocalanus spp. (an average 60% and 17% of biomass, respectively). Maxima of zooplankton biomass were associated with the boundary of the distribution of freshwater and with the southern periphery of the estuary frontal zone (EFZ). The short-term temporal variation of the abundance of zooplankton was observed when the transect was repeated after 2 days: the biomass at the southern periphery of the EFZ decreased from 1900 to 250 mg/m3. The observed changes is supposed to be caused by the shift of the southern boundary of the EFZ under changing in the wind regime. At high phytoplankton biomass in the estuary (>7 μg Chl-a/L), the daily ingestion of Limnocalanus macrurus was 5.77, 4.46, 2.59 and 1.4 μg C/day in CVI, CV, CIV and CIII, respectively. Energy intake by younger copepodite stages not only covered the metabolic requirements, but also enabled the copepods to growth. At lower Chl-a concentration on the shelf (<2 μg/L), the mean values were lower (1.56 μg C/day and 1.17 μg C/day in CVI and CV, respectively) and hardly met the metabolic demands. The zooplankton grazing impact estimated with the gut fluorescence method varied from 0.2 to 7.3% of phytoplankton standing stock and from 2.2 to 30% of primary production. The results are discussed in relation to the specific hydrophysical conditions in the summer period and in comparison with the data obtained for the autumn season.

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REFERENCES

  1. E. G. Arashkevich, M. V. Flint, A. B. Nikishina, A. F. Pasternak, A. G. Timonin, J. V. Vasilieva, S. A. Mosharov, and K. A. Soloviev, “The role of zooplankton in the transformation of the organic matter in the Ob estuary, on the shelf, and in the deep regions of the Kara Sea,” Oceanology (Engl. Transl.) 50, 780–792 (2010).

  2. M. E. Vinogradov, E. A. Shushkina, L. P. Lebedeva, et al., “Mesoplankton of the eastern part of the Kara Sea and estuaries of Ob and Yenisei rivers,” Okeanologiya (Moscow) 34, 716–723 (1994).

    Google Scholar 

  3. V. G. Dvoretskii and A. G. Dvoretskii, Ecology of Zooplankton Communities from the Barents Sea and Adjacent Waters, Ed. by R. P. Makarevich (Murmansk Marine Biological Institute, Kola Scientific Center, Russian Academy of Sciences, Murmansk, 2015) [in Russian].

    Google Scholar 

  4. A. V. Drits, A. B. Nikishina, T. N. Semenova, V. M. Sergeeva, K. A. Solovyev, and M. V. Flint, “Spatial distribution and feeding of dominant zooplankton species in the Ob River estuary,” Oceanology (Engl. Transl.) 56, 382–394 (2016.

  5. A. G. Zatsepin, P. O. Zavialov, V. I. Baranov, et al., “On the mechanism of wind-induced transformation of a river runoff water lens in the Kara Sea,” Oceanology (Engl. Transl.) 57, 1–7 (2017).

  6. S. A. Lapin, “Hydrological characterization of the Ob’ Inlet in the summer and autumn seasons,” Oceanology (Engl. Transl.) 51, 925–934 (2011).

  7. S. A. Lapin, “Specific formation of the high productivity zones in Ob’ River estuary,” Tr. VNIRO 152, 146–154 (2014).

    Google Scholar 

  8. A. P. Lisitsyn, “Marginal filter of the oceans,” Okeanologiya (Moscow) 34, 735–747 (1994).

    Google Scholar 

  9. I. N. Sykhanova, M. V. Flint, E. G. Sakharova, et al., “Phytocenoses of the Ob estuary and Kara Sea shelf in the late spring season,” Oceanology (Engl. Transl.) 58, 802–816 (2018).

  10. M. V. Flint, T. N. Semenova, E. G. Arashkevich, I. N. Sukhanova, V. I. Gagarin, V. V. Kremenetskiy, M. A. Pivovarov, and K. A. Soloviev, “Structure of the zooplankton communities in the region of the Ob River’s estuarine frontal zone,” Oceanology (Engl. Transl.) 50, 766–779 (2010).

  11. L. L. Chislenko, Nomograms for Determination of Weight of Aquatic Organisms by Size and Body Shape (Nauka, Leningrad, 1968) [in Russian].

    Google Scholar 

  12. E. C. Carmack, M. Yamamoto-Kawai, T. W. N. Haine, et al., “Freshwater and its role in the Arctic Marine System: Sources, disposition, storage, export, and physical and biogeochemical consequences in the Arctic and global oceans,” J. Geophys. Res.: Biogeosci. 121, 675–717 (2016).

    Article  Google Scholar 

  13. A. B. Demidov, V. I. Gagarin, O. V. Vorobieva, et al., “Spatial and vertical variability of primary production in the Kara Sea in July and August 2016: the influence of the river plume and subsurface chlorophyll maxima,” Polar Biol. 41 (3), 563–578 (2018).

    Article  Google Scholar 

  14. A. V. Drits, A. F. Pasternak, A. B. Nikishina, et al., “The dominant copepods Senecella siberica and Limnocalanus macrurus in the Ob estuary: ecology in a high-gradient environment,” Polar Biol. 39, 1527–1538 (2016).

    Article  Google Scholar 

  15. A. V. Drits, A. F. Pasternak, and M. V. Flint, “Distribution and grazing of dominant zooplankton species in the Ob estuary: influence of the runoff regime,” Estuaries Coasts 40, 1082–1095 (2017).

    Article  Google Scholar 

  16. ICES Zooplankton Methodology Manual, Ed. by R. Harris, (Academic, London, 2000).

    Google Scholar 

  17. X. Irigoien, “Gut clearance rate constant, temperature and initial gut contents: a review,” J. Plankton Res. 20 (5), 997–1003 (1998).

    Article  Google Scholar 

  18. T. Ikeda, Y. Kanno, K. Ozaki, and A. Shinada, “Metabolic rates of epipelagic copepods as a function of body mass and temperature,” Mar. Biol. 139, 587–596 (2001).

    Article  Google Scholar 

  19. D. L. Mackas and R. N. Bohrer, “Fluorescence analysis of zooplankton gut contents and investigation of diel feeding patterns,” J. Exp. Mar. Biol. Ecol. 25, 77–85 (1976).

    Article  Google Scholar 

  20. J. Mauchline, The Biology of Calanoid Copepods, Advances in Marine Biology series vol. 33 (Elsevier, Amsterdam, 1998), pp. 1–708.

  21. J. W. McClelland, S. E. Tank, R. G. M. Spencer, and A. I. Shiklomanov, “Coordination and sustainability of river observing activities in the Arctic,” Arctic 68, 59–68 (2015).

    Article  Google Scholar 

  22. A. Pasternak, E. Arashkevich, M. Reigstad, et al., “Dividing mesozooplankton into upper and lower size groups: applications to the grazing impact in the Marginal Ice Zone of the Barents Sea,” Deep Sea Res., Part II 55, 2245–2256 (2008).

    Article  Google Scholar 

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ACKNOWLEDGMENTS

We thank the crew of the RV “Akademik Mstislav Keldysh” for help in the field work.

Funding

This work was performed in the framework of the state assignment of Ministry of Science and Higher Education of the Russian Federation (theme No. № 0149-2019-0008, processing and identification of zooplankton) and supported by the Russian Foundation for Basic Research (grants 18-05-60069, processing and analysis of environmental data, preparation of the manuscript; 17-05-00799, analysis of zooplankton distribution; 19-04-00322, analysis of zooplankton feeding; 19-05-00022, analysis of zooplankton grazing pressure).

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Authors and Affiliations

  1. Shirshov Institute of Oceanology, Russian Academy of Sciences, 117218, Moscow, Russia

    A. V. Drits, E. G. Arashkevich, A. A. Nedospasov, A. B. Amelina & M. V. Flint

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  1. A. V. Drits
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  2. E. G. Arashkevich
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  3. A. A. Nedospasov
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  4. A. B. Amelina
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  5. M. V. Flint
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Correspondence to A. V. Drits.

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Translated by S. Semenova

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Drits, A.V., Arashkevich, E.G., Nedospasov, A.A. et al. Structural and Functional Characteristics of Zooplankton in the Ob Estuary and Adjacent Shelf Areas of the Kara Sea in Summer. Oceanology 59, 347–357 (2019). https://doi.org/10.1134/S0001437019030044

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