© 2003 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
Reconstruction of environmental histories to investigate patterns of larval radiated shanny (Ulvaria subbifurcata) growth and selective survival in a large bay of Newfoundland
a Institute for Hydrobiology and Fisheries Science Olbersweg 24, 22767 Hamburg, Germany
b Northwest Atlantic Fisheries Centre St. John's, Newfoundland, Canada A1C 5X1
c Collecte Localisation Sattellites, Parc Technologique du Canal 8-10 rue Hermes, 31526 Ramonville-St.Agne Cedex, France
d Institute for Marine Research Kiel, Schleswig-Holstein 24105, Germany
e Department of Biology, University of Victoria P.O. Box 3020 CSC, Victoria, British Columbia, Canada V8W 3N5
*Correspondence to P. Pepin; tel: +1 709 772 2081; fax: +1 709 772 4105. e-mail: pepinp{at}dfo-mpo.gc.ca; hannes.baumann{at}uni-hamburg.de.
We used otolith microstructure analysis to reconstruct the growth histories of larval radiated shanny (Ulvaria subbifurcata) collected over a 2-week period in Trinity Bay, Newfoundland. A dynamic 3-dimensional, eddy-resolving circulation model of the region provided larval drift patterns, which were combined with measurements of temperature and zooplankton abundance to assess the environmental history of the larvae. The abundance of juvenile and adult capelin (Mallotus villosus), the dominant planktivorous fish in this area, was monitored using five hydroacoustic surveys. The goal was to determine whether environmental histories are helpful in explaining spatial and temporal differences in larval shanny growth, measured as cumulative distribution functions (CDF) of growth rates. We found evidence for a selective loss of slower growing individuals and recognized considerable spatial differences in the CDF of larval growth rates. Consistent patterns in capelin abundance suggested that faster growing survivors, sampled at the end of the 2-week period, developed in areas of low predator densities. A dome-shaped relationship between temperature and larval growth was observed, explaining a significant but small amount of the overall variability (14%). Effects of experienced prey concentrations on larval growth rates could not be demonstrated.
Keywords: process study, otolith microstructure analysis, selective mortality, parabolic growth model
Received 16 July 2002; accepted 13 January 2003.
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