Keystone Species and Modularity in Microbial Hydrocarbon Degradation Uncovered by Network Analysis and Association Rule Mining
Natural microbial communities in soils are highly diverse, allowing for rich networks of microbial interactions to unfold. Identifying key players in these networks is difficult as the distribution of microbial diversity at the local scale is typically non-uniform, and is the outcome of both abiotic environmental factors and microbial interactions.
Here, using spatially resolved microbial presence-absence data along an aquifer transect contaminated with hydrocarbons, we combined co-occurrence analysis with association rule mining to identify potential keystone species along the hydrocarbon degradation process. Derived co-occurrence networks were found to be of a modular structure, with modules being associated with specific spatial locations and metabolic activity along the contamination plume. Association rules identify species that never occur without another, hence identifying potential one-sided cross-feeding relationships.
We find that hub nodes in the rule network appearing in many rules as targets qualify as potential keystone species that catalyze critical transformation steps and are able to interact with varying partners. By contrasting analysis based on data derived from bulk samples and individual soil particles, we highlight the importance of spatial sample resolution. While individual inferred interactions are hypothetical in nature, requiring experimental verification, the observed global network patterns provide a unique first glimpse at the complex interaction networks at work in the microbial world.
Research news | 2021-10-16
Centre receives substantial research funding on sustainable food production
IKEA Foundation grants 30 million SEK for continued research on more sustainable and just food systems. Gullspång Invest and its subsidiary Gullspång Re:food contribute additional 5 million SEK
Research news | 2021-10-16
Beatrice Crona appointed professor in sustainability science
Deputy science director selected for newly established professorship in sustainability science with focus on sustainable food systems
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New MOOC on how to deal with the climate crisis
Learn how to drive the social change that is fundamentally required for an effective response to climate change
Research news | 2021-09-29
Ready for anything
Centre theme leader Cibele Queiroz explains why diversity is important in turbulent times