Effects of phosphorus loading on interactions of algae and bacteria: reinvestigation of the 'phytoplankton?bacteria paradox' in a continuous cultivation system
Result description
The effect of different phosphorus loads (LP) on the phosphorus (P) and carbon (C) content of algae and bacteria was assessed in continuous culture. We tested if a mixed microbial assemblage co-cultured with Cryptomonas phaseolus would comply with the "phytoplankton?bacteria paradox". At the level of a mixed microbial assemblage it is characterised by the following aspects: (1) bacteria profit from their high affinity to P and are better competitors at lower LP; (2) although algae compete with bacteriafor P, P-limited algae release extracellular C that stimulates growth of their bacterial competitors; (3) when bacteria depend on algae as their sole source of organic C, this provides a feedback mechanism by which algae limit the abundance of their competitors at higher LP; (4) large oscillations in the bacteria?algae ratios at the lowest LP point to a greater instability of this interaction with stronger P competition.
Keywords
The result's identifiers
Result code in IS VaVaI
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Effects of phosphorus loading on interactions of algae and bacteria: reinvestigation of the 'phytoplankton?bacteria paradox' in a continuous cultivation system
Original language description
The effect of different phosphorus loads (LP) on the phosphorus (P) and carbon (C) content of algae and bacteria was assessed in continuous culture. We tested if a mixed microbial assemblage co-cultured with Cryptomonas phaseolus would comply with the "phytoplankton?bacteria paradox". At the level of a mixed microbial assemblage it is characterised by the following aspects: (1) bacteria profit from their high affinity to P and are better competitors at lower LP; (2) although algae compete with bacteriafor P, P-limited algae release extracellular C that stimulates growth of their bacterial competitors; (3) when bacteria depend on algae as their sole source of organic C, this provides a feedback mechanism by which algae limit the abundance of their competitors at higher LP; (4) large oscillations in the bacteria?algae ratios at the lowest LP point to a greater instability of this interaction with stronger P competition.
Czech name
Vlivy různého zatížení fosforem na interakce řas a bakterií: přezkoumání ?paradoxu fytoplankton?bakterie? v systému kontinuální kultivace
Czech description
Vliv různého zatížení fosforem (LP) na obsah fosforu (P) a uhlíku (C) v řasách a bakteriích byl stanovován v kontinuální kultuře. Testovali jsme, zda smíšené mikrobiální společenstvo kultivované s Cryptomonas phaseolus odpovídá ?paradoxu fytoplankton?bakterie?. Ten je na úrovni smíšeného mikrobiálního společenstva charakterizován následujícími rysy: (1) bakterie profitují z jejich vysoké afinity k P a jsou lepší konkurenti při nízkém LP; (2) zatímco řasy konkurují bakteriím o P, vylučují P-limitované řasy extracelulární C, jenž stimuluje růst jejich bakteriálních konkurentů; (3) pokud bakterie závisí na řasách jako jediném zdroji organického C, působí zpětnovazební mechanismus, jímž řasy limitují početnost jejich konkurentů při vyšším LP; (4) velké kolísání poměru bakterie?řasy při nejnižším LP svědčí o velké nestabilitě této interakce a silnější konkurenci o P.
Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
EH - Ecology - communities
OECD FORD branch
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Result continuities
Project
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Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2005
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Aquatic Microbial Ecology
ISSN
0948-3055
e-ISSN
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Volume of the periodical
38
Issue of the periodical within the volume
3
Country of publishing house
DE - GERMANY
Number of pages
11
Pages from-to
203-213
UT code for WoS article
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EID of the result in the Scopus database
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Basic information
Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
EH - Ecology - communities
Year of implementation
2005