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To What Extent Do Food Preferences Explain the Trophic Position of Heterotrophic and Mixotrophic Microbial Consumers in a Sphagnum Peatland?
MedLine Citation:
PMID:  23839799     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Although microorganisms are the primary drivers of biogeochemical cycles, the structure and functioning of microbial food webs are poorly studied. This is the case in Sphagnum peatlands, where microbial communities play a key role in the global carbon cycle. Here, we explored the structure of the microbial food web from a Sphagnum peatland by analyzing (1) the density and biomass of different microbial functional groups, (2) the natural stable isotope (δ (13)C and δ (15)N) signatures of key microbial consumers (testate amoebae), and (3) the digestive vacuole contents of Hyalosphenia papilio, the dominant testate amoeba species in our system. Our results showed that the feeding type of testate amoeba species (bacterivory, algivory, or both) translates into their trophic position as assessed by isotopic signatures. Our study further demonstrates, for H. papilio, the energetic benefits of mixotrophy when the density of its preferential prey is low. Overall, our results show that testate amoebae occupy different trophic levels within the microbial food web, depending on their feeding behavior, the density of their food resources, and their metabolism (i.e., mixotrophy vs. heterotrophy). Combined analyses of predation, community structure, and stable isotopes now allow the structure of microbial food webs to be more completely described, which should lead to improved models of microbial community function.
Authors:
Vincent E J Jassey; Caroline Meyer; Christine Dupuy; Nadine Bernard; Edward A D Mitchell; Marie-Laure Toussaint; Marc Metian; Auriel P Chatelain; Daniel Gilbert
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-7-10
Journal Detail:
Title:  Microbial ecology     Volume:  -     ISSN:  1432-184X     ISO Abbreviation:  Microb. Ecol.     Publication Date:  2013 Jul 
Date Detail:
Created Date:  2013-7-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7500663     Medline TA:  Microb Ecol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
UMR CNRS/UFC 6249, Laboratoire Chrono-Environnement, Université de Franche-Comté, 25211, Montbéliard Cedex, France, vincent.jassey@epfl.ch.
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