Spatial scaling of microbial eukaryote diversity.

Area of Science:

• Ecology
• Microbiology
• Biodiversity research

Background:

• Understanding spatial distribution patterns is key to ecosystem complexity and biodiversity regulation.
• Microorganisms play critical roles in biogeochemistry and ecosystem functioning, yet their spatial diversification remains understudied.

Purpose of the Study:

• To quantitatively estimate microbial community turnover at local and regional scales.
• To analyze the taxa-area relationship for terrestrial microbial eukaryotes.
• To project taxa-area relationships to continental scales using turnover patterns.

Main Methods:

• Utilized the largest spatially explicit microbial diversity dataset (> 10^6 sample pairs).
• Calculated microbial community turnover rates across varying geographical distances and habitats.
• Examined the taxa-area relationship, comparing terrestrial microbial eukaryotes to aquatic systems.

Main Results:

• Microbial turnover rates were low across large geographical distances and similar within distinct habitats.
• Turnover rates did not increase between different vegetation types.
• The taxa-area relationship for terrestrial microbial eukaryotes was relatively flat (z = 0.074), consistent with aquatic habitats, suggesting moderate regional diversity despite high local diversity.

Conclusions:

• Microbial spatial diversification patterns indicate moderate regional diversity.
• Turnover patterns can be extrapolated to project taxa-area relationships on continental scales.
• Future research should focus on collecting cross-continental taxa dissimilarity data to refine these projections.