NDLI: Impacts of nutrient enrichment and sediment on phytoplankton community structure in the northern Baltic Sea

Content Provider	Springer Nature Link
Author	Lagus, Annika Suomela, Janne Helminen, Harri Sipura, Jaana
Copyright Year	2007
Abstract	A three-week mesocosm experiment was conducted in order to study the effects of bottom sediment and nutrient enrichment on phytoplankton and zooplankton community structure in the Archipelago Sea, northern Baltic Sea. The transparent polyethylene enclosures included the whole water column and varied in volume from 30 to 40 m3. There were two types of enclosures: some with natural sediment as a bottom and others with a plastic bottom. The experiment was a 2 × 2 factorial design with presence of sediment and nutrient enrichment as treatment factors. Both the sediment presence and nutrient enrichment significantly increased water nutrient concentrations and the rate of primary production. However, external nutrient enrichment and the presence of sediment stimulated the growth of different phytoplankton groups, indicating that the effect of sediment was not related to nutrient fluxes alone, but involved more complex interactions. External nutrient enrichment was primarily channelled to picoplanktonic cyanobacteria, the biomass of which increased four- to fivefold due to enrichment. The presence of sediment increased the biomass of cryptophytes, chrysophytes and prasinophytes, but decreased the biomass of N2-fixing cyanobacteria. Zooplankton biomass increased during the experiment, but was not affected by the treatments. The study shows that sediment plays a significant role in phytoplankton dynamics, underlining the importance of including sediment in shallow-water mesocosm experiments.
Starting Page	351
Ending Page	368
Page Count	18
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	579
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2007-01-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plankton Sediment Eutrophication Mesocosm experiment Picocyanobacteria Baltic Sea Ecology Hydrobiology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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