Document Detail


Rapid successions affect microbial N-acetyl-glucosamine uptake patterns during a lacustrine spring phytoplankton bloom.
MedLine Citation:
PMID:  22082109     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The vernal successions of phytoplankton, heterotrophic nanoflagellates (HNF) and viruses in temperate lakes result in alternating dominance of top-down and bottom-up factors on the bacterial community. This may lead to asynchronous blooms of bacteria with different life strategies and affect the channelling of particular components of the dissolved organic matter (DOM) through microbial food webs. We followed the dynamics of several bacterial populations and of other components of the microbial food web throughout the spring phytoplankton bloom period in a pre-alpine lake, and we assessed bacterial uptake patterns of two constituents of the labile DOM pool (N-acetyl-glucosamine [NAG] and leucine). There was a clear genotypic shift within the bacterial assemblage, from fast growing Cytophaga-Flavobacteria (CF) affiliated with Fluviicola and from Betaproteobacteria (BET) of the Limnohabitans cluster to more grazing resistant AcI Actinobacteria (ACT) and to filamentous morphotypes. This was paralleled by successive blooms of viruses and HNF. We also noted the transient rise of other CF (related to Cyclobacteriaceae and Sphingobacteriaceae) that are not detected by fluorescence in situ hybridization with the general CF probe. Both, the average uptake rates of leucine and the fractions of leucine incorporating bacteria were approximately five to sixfold higher than of NAG. However, the composition of the NAG-active community was much more prone to genotypic successions, in particular of bacteria with different life strategies: While 'opportunistically' growing BET and CF dominated NAG uptake in the initial period ruled by bottom-up factors, ACT constituted the major fraction of NAG active cells during the subsequent phase of high predation pressure. This indicates that some ACT could profit from a substrate that might in parts have originated from the grazing of protists on their bacterial competitors.
Authors:
Ester M Eckert; Michaela M Salcher; Thomas Posch; Bettina Eugster; Jakob Pernthaler
Related Documents :
25161039 - Large-scale single step partial purification of potato pectin methylesterase that enabl...
22414199 - Patients' lived experiences of a reduced intake of food and drinks during illness: a li...
22856569 - Safe eats: an evaluation of the use of social media for food safety education.
22771079 - Understanding the process of establishing a food and nutrition policy: the case of slov...
22644579 - Flexibility and persistence of chimpanzee (pan troglodytes) foraging behavior in a capt...
21637749 - Persistence increases with diversity and connectance in trophic metacommunities.
23659729 - A dietary survey of patients with irritable bowel syndrome.
4009699 - Type and strength of food preferences of individuals with prader-willi syndrome.
14964909 - Calcium intake of asian and caucasian adolescents in hawaii.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-14
Journal Detail:
Title:  Environmental microbiology     Volume:  -     ISSN:  1462-2920     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883692     Medline TA:  Environ Microbiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2011 Society for Applied Microbiology and Blackwell Publishing Ltd.
Affiliation:
Limnological Station, Institute of Plant Biology, University of Zurich, Seestrasse 187, 8802 Kilchberg, Switzerland.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

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


Previous Document:  Using a modified technology acceptance model to evaluate healthcare professionals' adoption of a new...
Next Document:  Design, Synthesis, Structure, and Dehydrogenation Reactivity of a Water-Soluble o-Iodoxybenzoic Acid...