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Causes of different impact of Major Baltic Inflows on cod reproduction in the Gotland Basin of the Baltic Sea

  • Marine Biology
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Oceanology Aims and scope

Abstract

The impact of the Major Baltic Inflows (MBIs) of 1976, 1993, and 2003 on cod reproduction in the Gotland Basin of the Baltic Sea is considered based on calculations of the eastern Baltic cod egg abundance and offspring survival indices. The reproductive success (1976–1977) was defined by the elevation of the 11 psu isohaline and deepening of the 2 mL/L isooxygene surface, which provided the formation of a water layer suitable for cod spawning at a depth of 90–130 m. Prerequisites of the appearance of the reproductive layer in 1976–1977 were a previously high salinity level and penetrating two successive MBIs in one year. The cause of the weak MBI impact in 1993 was the previous salinity minimum; in 2003 it was rapid oxygen depletion due to an increase in temperature. As a result of their weaker influence, small and fragmented cod spawning biotopes appeared in the Gotland Basin.

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Authors and Affiliations

  1. Atlantic Reseach Institute of Fisheries and Oceanography (AtlantNIRO), Kaliningrad, Russia

    E. M. Karaseva & A. S. Zezera

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  1. E. M. Karaseva
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  2. A. S. Zezera
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Correspondence to E. M. Karaseva.

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Original Russian Text © E.M. Karaseva, A.S. Zezera, 2016, published in Okeanologiya, 2016, Vol. 56, No. 5, pp. 708–719.

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Karaseva, E.M., Zezera, A.S. Causes of different impact of Major Baltic Inflows on cod reproduction in the Gotland Basin of the Baltic Sea. Oceanology 56, 643–654 (2016). https://doi.org/10.1134/S0001437016040068

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