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Spatiotemporal disturbance characteristics determine functional stability and collapse risk of simulated microbial ecosystems.

Abstract：

:Terrestrial microbial ecosystems are exposed to many types of disturbances varying in their spatial and temporal characteristics. The ability to cope with these disturbances is crucial for maintaining microbial ecosystem functions, especially if disturbances recur regularly. Thus, understanding microbial ecosystem dynamics under recurrent disturbances and identifying drivers of functional stability and thresholds for functional collapse is important. Using a spatially explicit ecological model of bacterial growth, dispersal, and substrate consumption, we simulated spatially heterogeneous recurrent disturbances and investigated the dynamic response of pollutant biodegradation - exemplarily for an important ecosystem function. We found that thresholds for functional collapse are controlled by the combination of disturbance frequency and spatial configuration (spatiotemporal disturbance regime). For rare disturbances, the occurrence of functional collapse is promoted by low spatial disturbance fragmentation. For frequent disturbances, functional collapse is almost inevitable. Moreover, the relevance of bacterial growth and dispersal for functional stability also depends on the spatiotemporal disturbance regime. Under disturbance regimes with moderate severity, microbial properties can strongly affect functional stability and shift the threshold for functional collapse. Similarly, networks facilitating bacterial dispersal can delay functional collapse. Consequently, measures to enhance or sustain bacterial growth/dispersal are promising strategies to prevent functional collapses under moderate disturbance regimes.

journal_name

Sci Rep

journal_title

Scientific reports

authors

König S,Worrich A,Banitz T,Centler F,Harms H,Kästner M,Miltner A,Wick LY,Thullner M,Frank K

doi

10.1038/s41598-018-27785-4

subject

Has Abstract

pub_date

2018-06-22 00:00:00

pages

9488

issue

1

issn

2045-2322

pii

10.1038/s41598-018-27785-4

journal_volume

8

pub_type

杂志文章

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