Effect of continuous nutrient enrichment on microalgae colonizing hard substrates.

Hillebrand, Helmut and Sommer, Ulrich (2000) Effect of continuous nutrient enrichment on microalgae colonizing hard substrates. Hydrobiologia, 426 (1). pp. 183-190. DOI 10.1023/A:1003943201178.

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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.

Document Type: Article
Keywords: Food Webs; nutrient competition - periphyton - nitrogen - silicate - eutrophication - benthic microalgae - hard substrates
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1023/A:1003943201178
ISSN: 0018-8158
Date Deposited: 18 Feb 2008 17:24
Last Modified: 29 Jun 2018 12:45
URI: http://oceanrep.geomar.de/id/eprint/1901

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