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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on June 2, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(5):956-962; doi:10.1093/icesjms/fsm068
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Vertical distribution of Baltic sprat larvae: changes in patterns of diel migration?

Rüdiger Voss, Jörn O. Schmidt and Dietrich Schnack

Leibniz-Institute of Marine Sciences, Düsternbrooker Weg 20, 24105 Kiel, Germany

Correspondence to R. Voss: tel: +49 431 600 4557; fax: +49 431 600 4553; e-mail: rvoss{at}ifm-geomar.de

Voss, R., Schmidt, J. O., and Schnack, D. 2007. Vertical distribution of Baltic sprat larvae: changes in patterns of diel migration? – ICES Journal of Marine Science, 64: 956–962.

Ontogenetic and diurnal vertical migration patterns of Baltic sprat larvae were investigated for the periods 1989–1990 and 1998–2002. Comparison of the results led to the hypothesis that the diel vertical migration behaviour of sprat larvae >10 mm has changed. In 1989 and 1990, sprat larvae migrated to the surface at night, whereas they stayed 30–50 m deep by day. From 1998 to 2002, sprat larvae showed no signs of diel vertical migration, remaining in warmer, near-surface water by day and night. This behavioural change coincided with a more general change in the Baltic ecosystem, i.e. an increase in near-surface temperature and a general increase in abundance of the major prey organism (Acartia spp.) of Baltic sprat larvae, with more pronounced aggregation in surface waters.

Keywords: Baltic Sea, behavioural change, diel migration, prey availability, sprat larvae, vertical distribution

Received 14 September 2006; accepted 9 April 2007; advance access publication 2 June 2007.


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