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Effect of continuous nutrient enrichment on microalgae colonizing hard substrates
Hillebrand, H.; Sommer, U. (2000). Effect of continuous nutrient enrichment on microalgae colonizing hard substrates, in: Liebezeit, G. et al. (Ed.) Life at Interfaces and Under Extreme Conditions: Proceedings of the 33rd European Marine Biology Symposium, Wilhelmshaven, Germany, 7-11 September 1998. Hydrobiologia, 426(1-3): pp. 185-192
In: Liebezeit, G.; Dittmann, S.; Kröncke, I. (Ed.) (2000). Life at Interfaces and Under Extreme Conditions: Proceedings of the 33rd European Marine Biology Symposium, Wilhelmshaven, Germany, 7-11 September 1998. Hydrobiologia, 426(1-3). Kluwer Academic: Dordrecht. 210 pp., more
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158, more
Peer reviewed article  

Also published as
  • Hillebrand, H.; Sommer, U. (2000). Effect of continuous nutrient enrichment on microalgae colonizing hard substrates. Hydrobiologia 426: 185-192, more

Available in Authors 
Document type: Conference paper

Keywords
    Algae; Nutrients (mineral); Substrata; Marine

Authors  Top 
  • Hillebrand, H.
  • Sommer, U.

Abstract
    In order to understand the effect of changing nutrient conditions on benthic microalgae on hard substrates, in situ experiments with artificial substrates were conducted in Kiel Fjord, Western Baltic Sea. As an extension of previous investigations, we used artificial substrates without silicate and thus were able to supply nutrient media with different Si:N ratios to porous substrates, from where they trickled out continuously. The biofilm developing on these substrates showed a significant increase in biovolume due to N + P enrichment, while Si alone had only minor effects. The stoichiometric composition of the biomass indicated nitrogen limitation during most of the year. The C:N ratios were lowered by the N + P addition. The algae were dominated by diatoms in most cases, but rhodophytes and chlorophytes also became important. The nutrient treatment affected the taxonomic composition mostly at the species level. The significance of the results with regard to coastal eutrophication is discussed.

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