Competition between a toxic and a non-toxic Microcystis strain under constant and pulsed nitrogen and phosphorus supply

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Suominen , S , Brauer , V S , Rantala-Ylinen , A , Sivonen , K & Hiltunen , T 2017 , ' Competition between a toxic and a non-toxic Microcystis strain under constant and pulsed nitrogen and phosphorus supply ' , Aquatic Ecology , vol. 51 , no. 1 , pp. 117-130 . https://doi.org/10.1007/s10452-016-9603-2

Title: Competition between a toxic and a non-toxic Microcystis strain under constant and pulsed nitrogen and phosphorus supply
Author: Suominen, Saara; Brauer, Verena S.; Rantala-Ylinen, Anne; Sivonen, Kaarina; Hiltunen, Teppo
Contributor organization: Department of Food and Nutrition
Cyanobacteria research
Date: 2017-03
Language: eng
Number of pages: 14
Belongs to series: Aquatic Ecology
ISSN: 1386-2588
DOI: https://doi.org/10.1007/s10452-016-9603-2
URI: http://hdl.handle.net/10138/307949
Abstract: The toxicity of a harmful algal bloom is strongly determined by the relative abundance of non-toxic and toxic genotypes and might therefore be regulated by competition for growth-limiting resources. Here, we studied how the toxic Microcystis aeruginosa strain PCC 7806 and a non-toxic mutant compete for nitrogen and phosphorus under constant and pulsed nutrient supply. Our monoculture and competition experiments show that these closely related genotypes have distinct nutrient physiologies and that they differ in their ability to compete for nitrogen and phosphorus. The toxic wild type won the competition under nitrogen limitation, while the non-toxic mutant dominated under phosphorus limitation. Pulses of both nitrogen and phosphorus increased the dominance of the toxic genotype, which lead to an even faster competitive exclusion of the non-toxic genotype under nitrogen pulses and to coexistence of both genotypes under phosphorus pulses. Our findings indicate that the genotype level dynamics driven by resource competition can be an important factor in determining cyanobacterial bloom toxicity.
Subject: Algal toxins
Droop model
Harmful cyanobacteria
Nutrient limitation
Microcosm
Microcystis aeruginosa
Plankton dynamics
Resource pulses
Quantitative PCR
CYANOBACTERIUM PLANKTOTHRIX-AGARDHII
AERUGINOSA PCC 7806
3-WAY TRADE-OFF
BALTIC SEA
VARIABLE ENVIRONMENT
RESOURCE COMPETITION
GENETIC DIVERSITY
LIGHT-INTENSITY
CLIMATE-CHANGE
GROWTH-RATE
1172 Environmental sciences
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: acceptedVersion


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