Causes of different impact of Major Baltic Inflows on cod reproduction in the Gotland Basin of the Baltic Sea
| Autor: | E. M. Karaseva, A. S. Zezera |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Biotope 010504 meteorology & atmospheric sciences Reproductive success 010604 marine biology & hydrobiology media_common.quotation_subject Structural basin Oceanography 01 natural sciences Salinity Fishery Water layer Baltic sea Abundance (ecology) Environmental science Reproduction 0105 earth and related environmental sciences media_common |
| Zdroj: | Oceanology. 56:643-654 |
| ISSN: | 1531-8508 0001-4370 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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