Document Detail

Significance of predation by protists in aquatic microbial food webs.
MedLine Citation:
PMID:  12448728     Owner:  NLM     Status:  MEDLINE    
Predation in aquatic microbial food webs is dominated by phagotrophic protists, yet these microorganisms are still understudied compared to bacteria and phytoplankton. In pelagic ecosystems, predaceous protists are ubiquitous, range in size from 2 gm flagellates to > 100 microm ciliates and dinoflagellates, and exhibit a wide array of feeding strategies. Their trophic states run the gamut from strictly phagotrophic, to mixotrophic: partly autotrophic and partly phagotrophic, to primarily autotrophic but capable of phagotrophy. Protists are a major source of mortality for both heterotrophic and autotrophic bacteria. They compete with herbivorous meso- and macro-zooplankton for all size classes of phytoplankton. Protist grazing may affect the rate of organic sinking flux from the euphotic zone. Protist excretions are an important source of remineralized nutrients, and of colloidal and dissolved trace metals such as iron, in aquatic systems. Work on predation by protists is being facilitated by methodological advances, e.g., molecular genetic analysis of protistan diversity and application of flow cytometry to study population growth and feeding rates. Examples of new research areas are studies of impact of protistan predation on the community structure of prey assemblages and of chemical communication between predator and prey in microbial food webs.
Evelyn B Sherr; Barry F Sherr
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Review    
Journal Detail:
Title:  Antonie van Leeuwenhoek     Volume:  81     ISSN:  0003-6072     ISO Abbreviation:  Antonie Van Leeuwenhoek     Publication Date:  2002 Aug 
Date Detail:
Created Date:  2002-11-22     Completed Date:  2003-01-17     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0372625     Medline TA:  Antonie Van Leeuwenhoek     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  293-308     Citation Subset:  IM    
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MeSH Terms
Eukaryota / physiology*
Feeding Behavior
Food Chain*
Predatory Behavior*
Water / parasitology*
Water Microbiology*
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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