Влияние факторов среды на распределение и рост личинок сельди в разных районах Рижского залива
Long-term dynamics of spring spawning herring larvae abundance and growth in 1960 - 1988 in the Gulf of Riga areas was considered. Their periodical fluctuations, connected with the environmental conditions (winter severity, water temperature, food supply) were revealed. The decrease of herring year-class strength in the 1980s comparing with the 1960 - 1970s was observed. That was caused mainly by the thermal regime (increase of winter severity and decrease of water heat reserve in the gulf in spring), decrease of larvae food supply (especially at the period of herring transfer to exogenous feeding), increase of anthropogenic pollution of the gulf. It was shown, that against the total background of larvae abundance decrease in the 1980s in the Gulf of Riga, comparing with the 1960 - 1970s changes in their quantitative distribution according to areas took place. The importance of the southern area considerably increased, and of the eastern and northern areas decreased.
| Main Authors: | , |
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| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
1990
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| Subjects: | Baltic herring, Larvae, Year-class strength, ASFA_2015::F::Fish larvae, ASFA_2015::G::Growth, ASFA_2015::R::Relative abundance, ASFA_2015::E::Environmental conditions, ASFA_2015::S::Spatial distribution, |
| Online Access: | http://hdl.handle.net/1834/9546 |
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