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| Titel |
Microbial food web dynamics along a soil chronosequence of a glacier forefield |
| VerfasserIn |
J. Esperschütz, A. Pérez-de-Mora, K. Schreiner, G. Welzl, F. Buegger, J. Zeyer, F. Hagedorn, J. C. Munch, M. Schloter |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 11 ; Nr. 8, no. 11 (2011-11-11), S.3283-3294 |
| Datensatznummer |
250006200
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| Publikation (Nr.) |
 copernicus.org/bg-8-3283-2011.pdf |
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| Zusammenfassung |
| Microbial food webs are critical for efficient nutrient turnover providing
the basis for functional and stable ecosystems. However, the successional
development of such microbial food webs and their role in "young"
ecosystems is unclear. Due to a continuous glacier retreat since the middle
of the 19th century, glacier forefields have expanded offering an
excellent opportunity to study food web dynamics in soils at different
developmental stages. In the present study, litter degradation and the
corresponding C fluxes into microbial communities were investigated along
the forefield of the Damma glacier (Switzerland). 13C-enriched
litter of the pioneering plant Leucanthemopsis alpina (L.) Heywood was incorporated into the soil
at sites that have been free from ice for approximately 10, 60, 100 and more
than 700 years. The structure and function of microbial communities were
identified by 13C analysis of phospholipid fatty acids (PLFA) and
phospholipid ether lipids (PLEL). Results showed increasing microbial
diversity and biomass, and enhanced proliferation of bacterial groups as
ecosystem development progressed. Initially, litter decomposition proceeded
faster at the more developed sites, but at the end of the experiment loss of
litter mass was similar at all sites, once the more easily-degradable litter
fraction was processed. As a result incorporation of 13C into microbial
biomass was more evident during the first weeks of litter decomposition.
13C enrichments of both PLEL and PLFA biomarkers following litter
incorporation were observed at all sites, suggesting similar microbial
foodwebs at all stages of soil development. Nonetheless, the contribution of
bacteria, especially actinomycetes to litter turnover became more pronounced
as soil age increased in detriment of archaea, fungi and protozoa, more
prominent in recently deglaciated terrain. |
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