Document Detail

Can phosphorus limitation inhibit dissolved organic carbon consumption in aquatic microbial food webs? A study of three food web structures in microcosms.
MedLine Citation:
PMID:  12037613     Owner:  NLM     Status:  MEDLINE    
Microcosms with three different food web structures and phosphorus (P) limited growth medium were used to study the interactions between P and organic carbon (C) fractions in pelagic food webs. The cultures were run with low dilution to allow the biological processes to determine the outcome. A double isotope technique was used to follow the C and P compartments. In all systems the primary production was P limited. The measured P:C ratios and the observed accumulation of degradable dissolved organic carbon (DOC) indicated that the growth of heterotrophic bacteria was also P limited. The presence of neither algal grazers nor flagellates feeding on bacteria altered the limitation pattern. A net loss of P from the bacterial fraction was observed after the bloom. Different strategies for nutrient aquisition and growth are proposed as mechanisms enabling simultaneous P limitation of algae and bacteria, and a concomitant accumulation of degradable DOC. The ability of the algae to grow with low P:C ratio keeps the regeneration of P through grazers low enough to cause sustained P limitation of both algae and bacteria. The grazers were important producers of DOC when present. This implies that the usual assumption of carbon limited bacterial growth may lead to wrong conclusions regarding the dynamics of plankton communities and the DOC pool.
L M Olsen; H Reinertsen; O Vadstein
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2002-03-05
Journal Detail:
Title:  Microbial ecology     Volume:  43     ISSN:  0095-3628     ISO Abbreviation:  Microb. Ecol.     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-07-02     Completed Date:  2002-07-30     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  7500663     Medline TA:  Microb Ecol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  353-66     Citation Subset:  IM    
Trondheim Biological Station, Norwegian University of Science and Technology, N-7491 Trondheim, Norway.
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MeSH Terms
Algae / growth & development*
Carbon / metabolism*
Food Chain*
Phosphorus / analysis*
Population Dynamics
Water Microbiology*
Reg. No./Substance:
7440-44-0/Carbon; 7723-14-0/Phosphorus

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