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Modelling the influences of atmospheric forcing conditions on Baltic cod early life stages: distribution and drift
Hinrichsen, H.-H.; Böttcher, U.; Köster, F.W.; Lehmann, A.; St. John, M.A. (2003). Modelling the influences of atmospheric forcing conditions on Baltic cod early life stages: distribution and drift. J. Sea Res. 49(3): 187-201. dx.doi.org/10.1016/s1385-1101(03)00006-6
In: Journal of Sea Research. Elsevier/Netherlands Institute for Sea Research: Amsterdam; Den Burg. ISSN 1385-1101, more
Peer reviewed article  

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Keywords
    Atmospheric forcing; Dispersion; Drift; Geographical distribution; Juveniles; Modelling; Recruitment; Spawning grounds; Wind-driven currents; Gadus morhua Linnaeus, 1758 [WoRMS]; ANE, Baltic, Bornholm Basin [Marine Regions]; Marine

Authors  Top 
  • Hinrichsen, H.-H.
  • Böttcher, U., correspondent
  • Köster, F.W.
  • Lehmann, A.
  • St. John, M.A.

Abstract
    Retention or dispersion of larvae from the spawning ground has been identified as one of the key processes influencing recruitment success in fish stocks. An exercise combining 3-D hydrodynamic model simulations and field data on spatial distributions of juvenile Baltic cod was utilised to investigate the potential drift of larvae from the centre of main spawning effort in the Bornholm Basin, Baltic Sea. In the simulations cod larvae were represented as Lagrangian drifters. Habitats in which larvae and juvenile cod potentially dwell and where juveniles settle were identified to ascertain the importance of predicting transport. The transport of Baltic cod larvae was investigated by detailed drift model simulations for the years 1986 to 1999. The results yielded a clear dependency on wind-induced drift of larval cod, which is mainly controlled by the local atmospheric conditions over the Baltic Sea. Seasonally averaged distributions of drifters were compared with actual distributions of 0-group cod, as determined from bottom and pelagic trawl surveys conducted in autumn of the years 1993 to 2000 in and around the Bornholm Basin. The results suggest that juveniles caught in different areas can be assigned to different times of the spawning season. Because of seasonal differences in the circulation patterns, the southern coastal environment is on average most important for early and late spawners, whereas larvae hatching in mid-summer were on average transported towards the north or to a higher degree remained in the spawning ground.

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