Dispersal-Based Microbial Community Assembly Decreases Biogeochemical Function
Abstract
Ecological mechanisms influence relationships among microbial communities, which in turn impact biogeochemistry. In particular, microbial communities are assembled by deterministic (e.g., selection) and stochastic (e.g., dispersal) processes, and the relative balance of these two process types is hypothesized to alter the influence of microbial communities over biogeochemical function. We used an ecological simulation model to evaluate this hypothesis, defining biogeochemical function generically to represent any biogeochemical reaction of interest. We assembled receiving communities under different levels of dispersal from a source community that was assembled purely by selection. The dispersal scenarios ranged from no dispersal (i.e., selection-only) to dispersal rates high enough to overwhelm selection (i.e., homogenizing dispersal). We used an aggregate measure of community fitness to infer a given community’s biogeochemical function relative to other communities. We also used ecological null models to further link the relative influence of deterministic assembly to function. We found that increasing rates of dispersal decrease biogeochemical function by increasing the proportion of maladapted taxa in a local community. Niche breadth was also a key determinant of biogeochemical function, suggesting a tradeoff between the function of generalist and specialist species. Finally, we show that microbial assembly processes exert greater influence over biogeochemical function whenmore »
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Contributing Org.:
- Emily Graham; James Stegen
- OSTI Identifier:
- 1415078
- Report Number(s):
- PNNL-SA-129385
Journal ID: ISSN 2227-9717; PROCCO; KP1702030
- Grant/Contract Number:
- AC05-76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Processes
- Additional Journal Information:
- Journal Volume: 5; Journal Issue: 4; Journal ID: ISSN 2227-9717
- Publisher:
- Multidisciplinary Digital Publishing Institute (MDPI)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; stochasticity; determinism; microbial ecology; biogeochemistry; null model; ecosytem function
Citation Formats
Graham, Emily B., and Stegen, James C. Dispersal-Based Microbial Community Assembly Decreases Biogeochemical Function. United States: N. p., 2017.
Web. doi:10.3390/pr5040065.
Graham, Emily B., & Stegen, James C. Dispersal-Based Microbial Community Assembly Decreases Biogeochemical Function. United States. https://doi.org/10.3390/pr5040065
Graham, Emily B., and Stegen, James C. Wed .
"Dispersal-Based Microbial Community Assembly Decreases Biogeochemical Function". United States. https://doi.org/10.3390/pr5040065. https://www.osti.gov/servlets/purl/1415078.
@article{osti_1415078,
title = {Dispersal-Based Microbial Community Assembly Decreases Biogeochemical Function},
author = {Graham, Emily B. and Stegen, James C.},
abstractNote = {Ecological mechanisms influence relationships among microbial communities, which in turn impact biogeochemistry. In particular, microbial communities are assembled by deterministic (e.g., selection) and stochastic (e.g., dispersal) processes, and the relative balance of these two process types is hypothesized to alter the influence of microbial communities over biogeochemical function. We used an ecological simulation model to evaluate this hypothesis, defining biogeochemical function generically to represent any biogeochemical reaction of interest. We assembled receiving communities under different levels of dispersal from a source community that was assembled purely by selection. The dispersal scenarios ranged from no dispersal (i.e., selection-only) to dispersal rates high enough to overwhelm selection (i.e., homogenizing dispersal). We used an aggregate measure of community fitness to infer a given community’s biogeochemical function relative to other communities. We also used ecological null models to further link the relative influence of deterministic assembly to function. We found that increasing rates of dispersal decrease biogeochemical function by increasing the proportion of maladapted taxa in a local community. Niche breadth was also a key determinant of biogeochemical function, suggesting a tradeoff between the function of generalist and specialist species. Finally, we show that microbial assembly processes exert greater influence over biogeochemical function when there is variation in the relative contributions of dispersal and selection among communities. Taken together, our results highlight the influence of spatial processes on biogeochemical function and indicate the need to account for such effects in models that aim to predict biogeochemical function under future environmental scenarios.},
doi = {10.3390/pr5040065},
journal = {Processes},
number = 4,
volume = 5,
place = {United States},
year = {Wed Nov 01 00:00:00 EDT 2017},
month = {Wed Nov 01 00:00:00 EDT 2017}
}
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