Nitrogen enrichment suppresses other environmental drivers and homogenizes salt marsh leaf microbiome
Abstract
Microbial community assembly is affected by a combination of forces that act simultaneously, but the mechanisms underpinning their relative influences remain elusive. This gap strongly limits our ability to predict human impacts on microbial communities and the processes they regulate. Here, we experimentally demonstrate that increased salinity stress, food web alteration and nutrient loading interact to drive outcomes in salt marsh fungal leaf communities. Both salinity stress and food web alterations drove communities to deterministically diverge, resulting in distinct fungal communities. Increased nutrient loads, nevertheless, partially suppressed the influence of other factors as determinants of fungal assembly. Using a null model approach, we found that increased nutrient loads enhanced the relative importance of stochastic over deterministic divergent processes; without increased nutrient loads, samples from different treatments showed a relatively (deterministic) divergent community assembly whereas increased nutrient loads drove the system to more stochastic assemblies, suppressing the effect of other treatments. These results demonstrate that common anthropogenic modifications can interact to control fungal community assembly. As a result, our results suggest that when the environmental conditions are spatially heterogeneous (as in our case, caused by specific combinations of experimental treatments), increased stochasticity caused by greater nutrient inputs can reduce the importancemore »
- Authors:
-
[1];
[3];
- Instituto de Investigaciones Marinas y Costeras (Argentina)
- Kansas State Univ., Manhattan, KS (United States)
- Kansas State Univ., Manhattan, KS (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Duke Univ., Beaufort, NC (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1456792
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Ecology
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 6; Journal ID: ISSN 0012-9658
- Publisher:
- Ecological Society of America (ESA)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; deterministic vs. neutral processes; leaf fungal communities; microbial community assembly; nutrient loading; salt marshes; Spartina
Citation Formats
Daleo, Pedro, Alberti, Juan, Jumpponen, Ari, Veach, Allison M., Ialonardi, Florencia, Iribarne, Oscar, and Silliman, Brian. Nitrogen enrichment suppresses other environmental drivers and homogenizes salt marsh leaf microbiome. United States: N. p., 2018.
Web. doi:10.1002/ecy.2240.
Daleo, Pedro, Alberti, Juan, Jumpponen, Ari, Veach, Allison M., Ialonardi, Florencia, Iribarne, Oscar, & Silliman, Brian. Nitrogen enrichment suppresses other environmental drivers and homogenizes salt marsh leaf microbiome. United States. https://doi.org/10.1002/ecy.2240
Daleo, Pedro, Alberti, Juan, Jumpponen, Ari, Veach, Allison M., Ialonardi, Florencia, Iribarne, Oscar, and Silliman, Brian. Thu .
"Nitrogen enrichment suppresses other environmental drivers and homogenizes salt marsh leaf microbiome". United States. https://doi.org/10.1002/ecy.2240. https://www.osti.gov/servlets/purl/1456792.
@article{osti_1456792,
title = {Nitrogen enrichment suppresses other environmental drivers and homogenizes salt marsh leaf microbiome},
author = {Daleo, Pedro and Alberti, Juan and Jumpponen, Ari and Veach, Allison M. and Ialonardi, Florencia and Iribarne, Oscar and Silliman, Brian},
abstractNote = {Microbial community assembly is affected by a combination of forces that act simultaneously, but the mechanisms underpinning their relative influences remain elusive. This gap strongly limits our ability to predict human impacts on microbial communities and the processes they regulate. Here, we experimentally demonstrate that increased salinity stress, food web alteration and nutrient loading interact to drive outcomes in salt marsh fungal leaf communities. Both salinity stress and food web alterations drove communities to deterministically diverge, resulting in distinct fungal communities. Increased nutrient loads, nevertheless, partially suppressed the influence of other factors as determinants of fungal assembly. Using a null model approach, we found that increased nutrient loads enhanced the relative importance of stochastic over deterministic divergent processes; without increased nutrient loads, samples from different treatments showed a relatively (deterministic) divergent community assembly whereas increased nutrient loads drove the system to more stochastic assemblies, suppressing the effect of other treatments. These results demonstrate that common anthropogenic modifications can interact to control fungal community assembly. As a result, our results suggest that when the environmental conditions are spatially heterogeneous (as in our case, caused by specific combinations of experimental treatments), increased stochasticity caused by greater nutrient inputs can reduce the importance of deterministic filters that otherwise caused divergence, thus driving to microbial community homogenization.},
doi = {10.1002/ecy.2240},
journal = {Ecology},
number = 6,
volume = 99,
place = {United States},
year = {2018},
month = {4}
}
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