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Title: Microbial legacies alter decomposition in response to simulated global change

Abstract

Terrestrial ecosystem models assume that microbial communities respond instantaneously, or are immediately resilient, to environmental change. Here we tested this assumption by quantifying the resilience of a leaf litter community to changes in precipitation or nitrogen availability. By manipulating composition within a global change experiment, we decoupled the legacies of abiotic parameters versus that of the microbial community itself. After one rainy season, more variation in fungal composition could be explained by the original microbial inoculum than the litterbag environment (18% versus 5.5% of total variation). This compositional legacy persisted for 3 years, when 6% of the variability in fungal composition was still explained by the microbial origin. In contrast, bacterial composition was generally more resilient than fungal composition. Microbial functioning (measured as decomposition rate) was not immediately resilient to the global change manipulations; decomposition depended on both the contemporary environment and rainfall the year prior. Finally, using metagenomic sequencing, we showed that changes in precipitation, but not nitrogen availability, altered the potential for bacterial carbohydrate degradation, suggesting why the functional consequences of the two experiments may have differed. Predictions of how terrestrial ecosystem processes respond to environmental change may thus be improved by considering the legacies of microbial communities.

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [1];  [1];  [1]
  1. Univ. of California, Irvine, CA (United States)
  2. Univ. of California, Irvine, CA (United States); California State Univ. (CalState), Long Beach, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1413718
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
The ISME Journal
Additional Journal Information:
Journal Volume: 11; Journal Issue: 2; Journal ID: ISSN 1751-7362
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Martiny, Jennifer B. H., Martiny, Adam C., Weihe, Claudia, Lu, Ying, Berlemont, Renaud, Brodie, Eoin L., Goulden, Michael L., Treseder, Kathleen K., and Allison, Steven D. Microbial legacies alter decomposition in response to simulated global change. United States: N. p., 2016. Web. doi:10.1038/ismej.2016.122.
Martiny, Jennifer B. H., Martiny, Adam C., Weihe, Claudia, Lu, Ying, Berlemont, Renaud, Brodie, Eoin L., Goulden, Michael L., Treseder, Kathleen K., & Allison, Steven D. Microbial legacies alter decomposition in response to simulated global change. United States. doi:10.1038/ismej.2016.122.
Martiny, Jennifer B. H., Martiny, Adam C., Weihe, Claudia, Lu, Ying, Berlemont, Renaud, Brodie, Eoin L., Goulden, Michael L., Treseder, Kathleen K., and Allison, Steven D. Fri . "Microbial legacies alter decomposition in response to simulated global change". United States. doi:10.1038/ismej.2016.122. https://www.osti.gov/servlets/purl/1413718.
@article{osti_1413718,
title = {Microbial legacies alter decomposition in response to simulated global change},
author = {Martiny, Jennifer B. H. and Martiny, Adam C. and Weihe, Claudia and Lu, Ying and Berlemont, Renaud and Brodie, Eoin L. and Goulden, Michael L. and Treseder, Kathleen K. and Allison, Steven D.},
abstractNote = {Terrestrial ecosystem models assume that microbial communities respond instantaneously, or are immediately resilient, to environmental change. Here we tested this assumption by quantifying the resilience of a leaf litter community to changes in precipitation or nitrogen availability. By manipulating composition within a global change experiment, we decoupled the legacies of abiotic parameters versus that of the microbial community itself. After one rainy season, more variation in fungal composition could be explained by the original microbial inoculum than the litterbag environment (18% versus 5.5% of total variation). This compositional legacy persisted for 3 years, when 6% of the variability in fungal composition was still explained by the microbial origin. In contrast, bacterial composition was generally more resilient than fungal composition. Microbial functioning (measured as decomposition rate) was not immediately resilient to the global change manipulations; decomposition depended on both the contemporary environment and rainfall the year prior. Finally, using metagenomic sequencing, we showed that changes in precipitation, but not nitrogen availability, altered the potential for bacterial carbohydrate degradation, suggesting why the functional consequences of the two experiments may have differed. Predictions of how terrestrial ecosystem processes respond to environmental change may thus be improved by considering the legacies of microbial communities.},
doi = {10.1038/ismej.2016.122},
journal = {The ISME Journal},
number = 2,
volume = 11,
place = {United States},
year = {2016},
month = {10}
}

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Works referenced in this record:

Greengenes, a Chimera-Checked 16S rRNA Gene Database and Workbench Compatible with ARB
journal, July 2006

  • DeSantis, T. Z.; Hugenholtz, P.; Larsen, N.
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Search and clustering orders of magnitude faster than BLAST
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