Macroecology of unicellular organisms - patterns and processes

Area of Science:

• Macroecology
• Microbial Ecology
• Ecosystem Science

Background:

• Macroecology studies organism-environment relationships at large spatial scales.
• Traditionally focused on macroorganisms, macroecology now includes unicellular organisms.
• Microbial diversity presents unique sampling and characterization challenges.

Purpose of the Study:

• Review advances in microbial macroecology.
• Discuss microbial macroecology's impact on ecosystem functions.
• Synthesize current understanding of microbial distribution and diversity patterns.

Main Methods:

• Literature review of microbial macroecology studies.
• Analysis of species abundance distributions, species-area relationships, and distance-decay patterns.
• Examination of environmental factors influencing microbial community assembly.

Main Results:

• Microorganisms exhibit species abundance distributions similar to macroorganisms.
• Positive relationship observed between microbial distribution and abundance.
• Microbial species-area and distance-decay relationships are significant but weaker than for macroorganisms.
• Altitudinal gradients in microbial taxa show similarities to larger taxa; latitudinal gradients vary with context.
• Spatial scale, species traits, and ecosystem characteristics significantly affect microbial diversity patterns.

Conclusions:

• Microorganisms largely follow the same large-scale distribution patterns as macroorganisms.
• Local biotic and abiotic factors are crucial drivers of microbial community assembly and ecosystem processes.
• Many aspects of microbial macroecology remain poorly understood, with patterns dependent on specific taxa and ecosystems.