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ICES Journal of Marine Science: Journal du Conseil 2005 62(6):1021-1036; doi:10.1016/j.icesjms.2005.04.016
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© 2005 International Council for the Exploration of the Sea

Small-scale spatio-temporal variability in ichthyoplankton and zooplankton distribution in relation to a tidal-mixing front in the Irish Sea

O. Leea,1, R.D.M. Nashb and B.S. Danilowicza,*

a Department of Zoology, University College Dublin Belfield, Dublin 4, Ireland
b Department of Fisheries and Marine Biology, University of Bergen PO Box 7800, 5020 Bergen, Norway

*Correspondence to B. S. Danilowicz: College of Science and Technology, Georgia Southern University, PO Box 8044, Statesboro, GA 30460, USA; tel: +9126815111; fax: +9126810836. e-mail: bdanilowicz{at}georgiasouthern.edu.

This study examines the spatio-temporal dynamics of fish larvae and their prey at a tidal-mixing front in the central Irish Sea. The distribution of ichthyoplankton and zooplankton was analysed in relation to environmental variables (depth, surface temperature, surface salinity, and water column stratification) using Redundancy Analysis (RDA). Significant interannual variability in the formation and position of the tidal-mixing front coincided with large differences in the species abundances of both ichthyoplankton and zooplankton. During the summer, ichthyoplankton and zooplankton communities were structured by a combination of depth and hydrography, and the variability in species composition was directly related to the average value of the stratification parameter. Several ichthyoplankton species were consistently associated with frontal waters, while fewer species were concentrated in mixed water masses throughout the sampling period. The distribution of individual zooplankton species was also examined, and water mass affinities were shown to vary with developmental stage.

Keywords: fish larvae, Irish Sea, tidal-mixing front, zooplankton

Received 18 May 2004; accepted 27 April 2005.

1 Current address: Department of Zoology, Trinity College, Dublin 2, Ireland.


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