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JPR Advance Access originally published online on September 9, 2009
Journal of Plankton Research 2009 31(11):1353-1362; doi:10.1093/plankt/fbp078
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Species- and stratification-dependent diel vertical migration behaviour of three dinoflagellate species in a laboratory study

Therese Jephson* and Per Carlsson

Department of Ecology, Limnology and Marine ecology, Ecology building, Lund University, Lund, Sweden

* CORRESPONDING AUTHOR: therese.jephson{at}limnol.lu.se

Received on February 10, 2009; accepted on August 10, 2009


  Abstract

This study shows that different species of the same genus can behave differently in relation to a salinity gradient and suggests that a halocline can act as a barrier to the diel vertical migration (DVM) of dinoflagellate species. In a laboratory study, we found that the dinoflagellates Ceratium furca, C. tripos and Dinophysis acuta did not cross a salinity gradient of 5 psu, but instead exhibited DVM exclusively below and above the halocline. Furthermore, C. tripos aggregated in the halocline during the night and migrated to the surface at midday, whereas C. furca aggregated in the halocline at midday and migrated downwards to the bottom during the dark period. Dinophysis acuta was found exclusively above the halocline, with the highest density in the surface water at midday. The present results suggest that different dinoflagellate species display unique DVM behaviours in stratified waters. The species-specific DVM strategies revealed in this study are of central importance for understanding the ecology of these taxa and to further elucidate both the ecological significance and the mechanisms of DVM.

Corresponding editor: Roger Harris


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