Abstract
The methods presently in wide use for the assessment of marine ecosystems and fish stocks cannot provide the high-quality long-term prognoses urgently needed for improved management of marine ecosystems and their fishery resources. A novel method of forecasting the long-term qualitative composition of ecosystem and fish stocks in the Baltic Sea based on the periodicity and succession of the processes: extraterrestrial factors → climate changes → regime forming factors (chiefly salinity and temperature) → ecosystems → fish stocks was used in 1989 to predict the approximate year class abundances of cod (Gadus morhua callarias), sprat (Sprattus sprattus balticus), sea herring and gulf herring (Clupea harengus membras) in the Baltic Sea for the years 1989–2008. A comparison with actual development up to 2008 show that this prognosis was confirmed to a considerable extent. The method based on periodical fluctuations of freshwater input and the thermal regime is described. It predicts a new regime shift in the 2020s to a higher salinity and more acceptable conditions for the organisms of marine origin.
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Acknowledgments
We thank Dr. Ragnar Elmgren for his valuable suggestions to improve the quality of the article. We also thank the editors and the anonymous reviewers for their kind assistance. The study was partially financed by the Estonian Ministry of Education and Research (grant SF0180005s10) and the Estonian Science Foundation (grant No 8747).
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Margers Kalejs: deceased.
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Ojaveer, E., Kalejs, M. Long-term prediction on Baltic fish stocks based on periodicity of solar activity. Rev Fish Biol Fisheries 22, 683–693 (2012). https://doi.org/10.1007/s11160-012-9264-8
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DOI: https://doi.org/10.1007/s11160-012-9264-8