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JPR Advance Access originally published online on December 16, 2004
Journal of Plankton Research 2005 27(2):145-151; doi:10.1093/plankt/fbh165
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Journal of Plankton Research Vol. 27 No. 2 © Oxford University Press 2004; all rights reserved

Pelagic growth and colony division of Gloeotrichia echinulata in Lake Erken

Irene Karlsson-Elfgren*, Per Hyenstrand and Emil Riydin

Department of Limnology, Evolutionary Biology Centre, Norbyvägen 20, 75236 Uppsala, Sweden

* Corresponding Author: irene.karlsson{at}ebc.uu.se

Received March 13, 2003; accepted in principle May 13, 2004; accepted for publication November 25, 2004; published online December 16, 2004

Gloeotrichia echinulata colony development was monitored in Lake Erken, Sweden and studied in enclosure experiments. Significant colonial division did not occur in mesh bags, although the abundance of the pelagic population in the lake increased during the experimental periods. On the basis of these findings, it is suggested that circulation of G. echinulata to deeper nutrient rich water supports pelagic growth. In support of this, a large part of the buoyant G. echinulata colonies in Lake Erken was found at several meters depth. In an experiment with nutrient additions, the only treatment that favoured G. echinulata development was additions of phosphate, nitrate and iron. Trace element additions had a negative effect on the development of G. echinulata. On the basis of these findings, the nutritional requirements of G. echinulata are discussed.


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