These are the preliminary results from an ongoing analysis at Stockholm University (Department of Systems Ecology, Baltic Nest Institute at Stockholm Resilience Centre). The study is highly relevant for the management decision on Baltic cod, which will be taken by the Council of Ministers on October 27th 2008.
According to scientists at the International Council for the Exploration of the Seas (ICES), the eastern Baltic cod stock has increased since 2005 and is now higher than ever during the last decade. Researchers at Stockholm University analyzed whether this increase is a result of management actions reducing the fishing pressure or improved environmental conditions resulting in higher reproduction.
Model simulations show that neither reduced catches alone, nor higher reproduction, could explain the increase. Each factor only explained 25% of the total increase. Synergies between both factors were necessary for the current increase in the Baltic Sea cod stock.
- This analysis clearly illustrates the importance of management actions but it also underlines the non-linear dynamics in nature and the challenges involved in ecosystem management, says Henrik Österblom at Baltic Nest Institute and one of the authors behind the study.Does this mean that the Baltic cod stock is safe now?
Maria Sandqvist | alfa
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In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.
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