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

Autor: Saara Suominen, Teppo Hiltunen, Verena S. Brauer, Kaarina Sivonen, Anne Rantala-Ylinen
Přispěvatelé: Department of Food and Nutrition, Cyanobacteria research
Jazyk: angličtina
Rok vydání: 2017
Předmět:
0106 biological sciences
0301 basic medicine
Microcosm
Droop model
030106 microbiology
Chemie
chemistry.chemical_element
Aquatic Science
VARIABLE ENVIRONMENT
01 natural sciences
Algal bloom
03 medical and health sciences
Quantitative PCR
Nutrient
Harmful cyanobacteria
BLOOMS
Microcystis
PHYTOPLANKTON
Botany
Plankton dynamics
AERUGINOSA
3-WAY TRADE-OFF
Microcystis aeruginosa
Ecosystem
1172 Environmental sciences
Ecology
Evolution
Behavior and Systematics
CYANOBACTERIUM MICROCYSTIS
CLIMATE-CHANGE
biology
Algal toxins
CYANOBACTERIUM PLANKTOTHRIX-AGARDHII
010604 marine biology & hydrobiology
GROWTH-RATE
biology.organism_classification
Nitrogen
Resource pulses
Light intensity
RESOURCE COMPETITION
LIGHT
chemistry
Nutrient limitation
BALTIC SEA
GENETIC DIVERSITY
GROWTH
AERUGINOSA PCC 7806
LIGHT-INTENSITY
Biologie
Zdroj: Aquatic Ecology, 51(1), 117-130. SPRINGER
ISSN: 1386-2588
Popis: 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.
Databáze: OpenAIRE
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