Spatial structure: shaping the ecology and evolution of microbial communities.

Area of Science:

• Microbial Ecology
• Evolutionary Biology
• Theoretical Biology

Background:

• Microbes predominantly exist in spatially structured communities, significantly impacting their ecological and evolutionary trajectories.
• Microscale spatial organization, characterized by short interaction ranges and nutrient gradients, drives key processes like cross-feeding and niche construction.

Purpose of the Study:

• To review theoretical and experimental evidence on how spatial organization influences microbial eco-evolutionary processes.
• To highlight the challenges in linking microscale spatial dynamics to community- and ecosystem-level outcomes.
• To emphasize the importance of spatial interactions in microbiome research.

Main Methods:

• Review of theoretical models and experimental studies.
• Synthesis of evidence on spatial drivers of microbial evolution (e.g., founder effects, allele surfing).
• Discussion of recent advances in computational modeling, cultivation, and omics.

Main Results:

• Spatial structure drives various eco-evolutionary processes, including colonization dynamics, range expansion, multilevel selection, and genotype exploration.
• Clearer understanding of microscale spatial consequences, but linking these across scales remains a challenge.
• Spatial organization profoundly influences microbial behavior, community assembly, and stability.

Conclusions:

• Explicitly addressing spatial interactions is vital for advancing microbiome research.
• Integrating computational modeling, cultivation, and omics offers new avenues to study spatial effects.
• Spatial structure is a fundamental determinant of microbial organization and dynamics across scales.