A host of issues: pseudoreplication in host-microbiota studies.

Area of Science:

• Microbiology
• Ecology
• Biostatistics

Background:

• Pseudoreplication, the use of non-independent samples as independent replicates, can invalidate research findings.
• Host-microbiota interactions are a growing field, requiring robust methodologies for accurate results.

Purpose of the Study:

• To assess the prevalence of pseudoreplication in host-microbiota studies.
• To identify common sources of pseudoreplication and evaluate methodological reporting.

Main Methods:

• Systematic review of 115 manuscripts on host-microbiota interactions.
• Analysis of experimental designs and statistical methods for pseudoreplication.

Main Results:

• 22% of reviewed papers exhibited pseudoreplication, often due to co-housed organisms.
• 52% of studies lacked sufficient methodological details for assessing replication.
• 26% of studies appropriately addressed pseudoreplication.

Conclusions:

• High rates of pseudoreplication and insufficient reporting threaten the validity of host-microbiota research.
• Emphasizing rigorous experimental design and detailed methodological reporting is essential for ensuring reproducibility.