Trait-Based Life History Strategies Shape Bacterial Niche Breadth

Area of Science:

• Microbial Ecology
• Evolutionary Biology
• Genomics

Background:

• The ecological niche is crucial for understanding organismal diversity and distribution.
• Key traits determining bacterial niche breadth remain largely undefined.
• Studies show bacteria are not ubiquitous, highlighting niche specialization.

Purpose of the Study:

• To characterize bacterial niche breadth using a large-scale soil survey.
• To identify key life-history traits associated with niche breadth.
• To link gene functional diversity to niche breadth in bacteria.

Main Methods:

• Conducted a national-scale soil survey across environmental gradients.
• Analyzed over 2000 bacterial genomic datasets from the Genome Taxonomy Database (GTDB).
• Evaluated bacterial life-history traits including growth, competition, stress tolerance, resource acquisition, and dispersal.

Main Results:

• A positive correlation was found between gene functional diversity and niche breadth.
• Identified specific bacterial traits linked to niche breadth across five life-history categories.
• Broad-niche bacteria exhibited diverse traits across multiple life-history strategies, unlike specialists.

Conclusions:

• Bacterial niche breadth is positively associated with gene functional diversity.
• Life-history trait diversity is essential for broad-niche bacteria to thrive in varied environments.
• This study provides a trait-based framework for understanding bacterial niche breadth through life history theory.