System dynamics of the Barents Sea capelin

  • Yndestad H
  • Stene A
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Abstract

The capelin (Mallotus villosus) in the Barents Sea plays a key role in the Arctic food web. The large fluctuations in the biomass of the Barents Sea capelin have been poorly understood and collapses in the biomass have occurred. A system analysis of the capelin stock has identified a state differential equation model and a frequency transfer function model of the stock properties. The results of this research show that the capelin stock dynamics is adapted to the 18.6 year and the 18.6/3 = 6.2 year lunar nodal tide that influences the temperature in the Barents Sea. An analysis of the capelin time series has identified a 6.2 yr cycle of recruitment, maturity and fish stock growth. An estimated frequency response of a stock-number, life-cycle model has identified a stochastic resonance of about half of the 6.2 yr cycle. The stochastic resonance shows that fluctuation of the stock number is a natural adaptation to the environment and a strategy for optimal growth and survival in the long run. In this stochastic resonance timing between the stock number fluctuation and the 6.2 yr cycle is most important. © 2002 International Council for the Exploration of the Sea. Published by Elsevier Science Ltd. All rights reserved.

Author-supplied keywords

  • 18.6 Yr lunar nodal tide
  • Capelin ecology
  • Capelin management
  • Capelin model
  • Stochastic resonance

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Authors

  • Harald YndestadNorwegian University of Science and Technology. Faculty of Engineering and Natural Science

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  • Anne Stene

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