Testing the larval drift hypothesis in the Baltic Sea: retention vs. dispersion due to the influence of the wínd driven circulation.

Hinrichsen, Hans-Harald, St.John, M. A., Aro, E., Grønkjær, P. and Voss, Rüdiger (2001) Testing the larval drift hypothesis in the Baltic Sea: retention vs. dispersion due to the influence of the wínd driven circulation. Open Access ICES Journal of Marine Science, 58 . pp. 973-984. DOI 10.1006/jmsc.2001.1090.

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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
Christiansoe, a transport index has been developed, variations in annual retention/
dispersal have been identified, and comparisons with variations in recruitment success
are presented.

Document Type: Article
Keywords: Baltic cod, larval drift, recruitment success, retention and dispersal, wind-driven circulation
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1006/jmsc.2001.1090
ISSN: 1054-3139
Projects: AIR
Date Deposited: 18 Feb 2008 17:25
Last Modified: 07 Mar 2017 15:02
URI: http://oceanrep.geomar.de/id/eprint/4520

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