Competition for inorganic nutrients between phytoplankton and bacterioplankton in nutrient manipulated mesocosms

Joint, Ian, Henriksen, Peter, Fonnes, Gro Anita, Bourne, David, Thingstad, T. Frede, and Riemann, Bo (2002) Competition for inorganic nutrients between phytoplankton and bacterioplankton in nutrient manipulated mesocosms. Aquatic Microbial Ecology, 29 (2). pp. 145-159.

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A manipulative mesocosm experiment in Danish coastal waters tested the effect on plankton biodiversity and function of adding nitrate, phosphate and glucose. A comprehensive set of measurements was made over a 6 d period; these included phytoplankton biomass and production in 3 size fractions (>10, 10-2 and <2mum), bacterial biomass and production, nitrate and ammonium uptake, and pigment taxonomy. Addition of nitrate and phosphate resulted in increases of biomass and production of all size fractions of phytoplankton. Inorganic nutrients alone had only a minor effect on bacterial abundance and production, with slight increases relative to the control. The largest changes occurred in mesocosms to which glucose was added in excess with nitrate and phosphate. Pigment composition indicated little change in phytoplankton assemblage composition in any treatment. A large increase in bacterial activity in the presence of added glucose had a negative effect on the phytoplankton assemblage and resulted in a decline in phytoplankton biomass. Data on nutrient uptake and size-fractionated carbon fixation suggest that the mechanism of this phytoplankton suppression was the ability of heterotrophic bacteria to out-compete for available inorganic nutrients, resulting in nutrient limitation of the phytoplankton assemblage.

Item ID: 51158
Item Type: Article (Research - C1)
ISSN: 1616-1564
Keywords: phytoplankton/bacterial competition, nutrient uptake, pigment taxonomy, mesocosm
Funders: European Union (EU), Natural Environment Research Council
Projects and Grants: EU MAS3-CT97-0154
Date Deposited: 11 Oct 2017 07:43
FoR Codes: 06 BIOLOGICAL SCIENCES > 0605 Microbiology > 060599 Microbiology not elsewhere classified @ 100%
SEO Codes: 96 ENVIRONMENT > 9699 Other Environment > 969999 Environment not elsewhere classified @ 100%
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