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JPR Advance Access originally published online on April 13, 2006
Journal of Plankton Research 2006 28(7):683-694; doi:10.1093/plankt/fbl005
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Variation in hatching success and egg production of Eurytemora affinis (Calanoida, Copepoda) from the Gulf of Bothnia, Baltic Sea, in relation to abundance and clonal differences of diatoms

Jenny Ask1,*, Marko Reinikainen2 and Ulf Båmstedt1,3

1 Department of Ecology and Environmental Science, Umeå University, S-901 87 Umeå, Sweden, 2 Tvärminne Zoological Station, University of Helsinki, 10900 Hanko, Finland and 3 Umeå Marine Sciences Centre, Norrbyn, S-910 20 Hörnefors, Sweden

* Corresponding Author: jenny.ask{at}emg.umu.se

Received October 12, 2005; accepted in principle December 1, 2005; accepted for publication April 4, 2006; published online April 13, 2006
Communicating editor: K.J. Flynn

We monitored the hatching frequencies and clutch sizes of Eurytemora affinis, and environmental variables in the Gulf of Bothnia, between May and October 2003. We tested the hypothesis that the hatching frequency of the copepod would be negatively affected during time periods with high diatom concentrations. Results from two stations showed significant differences between the different sampling occasions, with the lowest observed hatching frequency during the spring diatom bloom. The reverse was true for clutch size, with the highest average egg number during the diatom bloom. These results were not correlated to ambient temperature, salinity or chlorophyll a (Chl a). In a separate laboratory experiment, nine different local clones of the diatom Skeletonema costatum were used as food for adult E. affinis females, in order to screen for possible differences in toxicity within the Skeletonema community. The resulting average copepod hatching frequency varied between 5 and 75% for the different clones, indicating that there can be large within-species variation in the toxic properties of diatoms. The significance of such variations in natural communities remains to be tested in future studies.


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