Document Detail

Sterol composition of freshwater algivorous ciliates does not resemble dietary composition.
MedLine Citation:
PMID:  17186159     Owner:  NLM     Status:  MEDLINE    
Algivorous ciliates represent an important link in freshwater food webs, as they transfer energy and biochemical matter from their algal prey to mesozooplankton predators. However, it is still unknown how dietary composition influences the biochemical composition of ciliates. We analyzed the sterol composition of the algivorous ciliates Balanion planctonicum and Urotricha farcta and compared it to the sterol composition of their diet--the cryptomonad Cryptomonas phaseolus. The sterol composition of the ciliates did not resemble that of their algal diet. Ergosterol [(22E)-ergosta-5,7,22-trien-3beta-ol] was the sterol in highest concentration in C. phaseolus, whereas stigmasterol [(24S)-24-ethylcholesta-5,22E-dien-3beta-ol] was dominant in both B. planctonicum and U. farcta. Moreover, the occasionally higher sterol concentrations in the ciliates than in their algal diet suggest sterol accumulation by the ciliates. We conclude that dietary sterol composition influences the composition of the two algivorous ciliates studied, but species-specific differences in metabolism probably determine the ultimate sterol composition of the ciliates.
I G Boëchat; A Krüger; R Adrian
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-12-22
Journal Detail:
Title:  Microbial ecology     Volume:  53     ISSN:  0095-3628     ISO Abbreviation:  Microb. Ecol.     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2007-01-31     Completed Date:  2007-04-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7500663     Medline TA:  Microb Ecol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  74-81     Citation Subset:  IM    
Leibniz-Institut für Gewässerökologie und Binnenfischerei, Müggelseedamm 301, D-12587, Berlin, Germany.
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MeSH Terms
Ciliophora / chemistry*,  classification,  physiology
Cryptophyta / chemistry*
Culture Media
Ergosterol / analysis,  metabolism
Food Chain*
Fresh Water / parasitology*
Species Specificity
Sterols / analysis*,  metabolism
Stigmasterol / analysis,  metabolism
Reg. No./Substance:
0/Culture Media; 0/Sterols; 57-87-4/Ergosterol; 83-48-7/Stigmasterol

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