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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.

Pelagic growth and colony division of Gloeotrichia echinulata in Lake Erken