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Testing the larval drift hypothesis in the Baltic Sea: retention versus dispersion caused by wind-driven circulation
Hinrichsen, H.-H.; St. John, M.; Grønkjaer, P.; Aro, E.; Voss, R. (2001). Testing the larval drift hypothesis in the Baltic Sea: retention versus dispersion caused by wind-driven circulation, in: Daan, N. et al. Recruitment dynamics of exploited marine populations: physical-biological interactions. Part 2: Proceedings of an ICES Symposium held in Baltimore, Maryland, USA 22-24 September 1997. ICES Marine Science Symposia, 214: pp. 973-984
In: Daan, N. et al. (Ed.) (2001). Recruitment dynamics of exploited marine populations: physical-biological interactions. Part 2: Proceedings of an ICES Symposium held in Baltimore, Maryland, USA 22-24 September 1997. ICES Marine Science Symposia, 214. Academic Press: London. ISBN 1054. 935-1114 pp., more
In: ICES Marine Science Symposia. ICES/Reitzel: Copenhagen. ISSN 0906-060X, more

Also published as
  • Hinrichsen, H.-H.; St. John, M.; Grønkjaer, P.; Aro, E.; Voss, R. (2001). Testing the larval drift hypothesis in the Baltic Sea: retention versus dispersion caused by wind-driven circulation. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 58(5): 973-984, more

Available in  Authors 
Document type: Conference

Keywords
    Drift; Larvae; Recruitment; Wave dispersion; Wind-driven circulation; ANE, Baltic [Marine Regions]; Marine

Authors  Top 
  • Hinrichsen, H.-H., correspondent
  • St. John, M.
  • Grønkjaer, P.
  • Aro, E.
  • Voss, R., more

Abstract
    Retention or dispersion of larvae from the spawning grounds has been identified as one of the key processes influencing recruitment success in fish stocks. To examine the potential effects of transport on recruitment, numerical simulations were performed utilizing a three-dimensional physical oceanographic model of the Baltic Sea. Cod larvae were represented as Lagrangian drifters released in the deepwater region of the Bornholm Basin, the main spawning ground for Baltic cod. Simulations were performed for the major spawning seasons of 1993 and 1994, when annual and interannual variability of meteorological forcing was large. The principal goals of the modelling exercise were first to identify the physical processes influencing the demersal distribution of the early life stages and second to describe the transport of the pelagic stages in response to variations in windstress, thereby identifying the meteorological and hydrodynamic mechanisms influencing retention and/or dispersal. The results suggest that periods of low wind, especially from northern and eastern directions, retain early life stages of cod within the deepwater region of the Bornholm Basin. Periods of higher windstress and duration from the west and south resulted in a rapid transport of larvae into shallow coastal regions. Based on the results obtained from these drift experiments and a wind data time series from the meteorological station Christians, a transport index has been developed, variations in annual retention/dispersal have been identified, and comparisons with variations in recruitment success are presented.

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