Three steps towards comparability and standardization among molecular methods for characterizing insect communities.

Area of Science:

• Ecology
• Molecular Biology
• Bioinformatics

Background:

• Molecular methods, particularly DNA metabarcoding, are powerful tools for insect monitoring but lack standardized protocols.
• Rapid advancements in the field have led to a lack of community-wide agreement on methodology, hindering large-scale, comparable biodiversity assessments.

Purpose of the Study:

• To propose three key recommendations for harmonizing DNA-based insect monitoring efforts.
• To establish practical standards for improving data comparability and enabling large-scale biodiversity assessments.
• To transition from laboratory-specific proof-of-concept studies to joint quality and calibration standards.

Main Methods:

• Adoption of synthetic spike-ins as positive controls and internal standards for between-sample comparisons.
• Implementation of multiplex polymerase chain reaction (PCR) using multiple gene markers for comprehensive community description.
• Commitment to standardized, transparent publication of all protocol-associated metadata (field, wet-lab, dry-lab).

Main Results:

• A ready-to-use recipe for synthetic cytochrome c oxidase spike-ins is provided.
• Two specific gene regions are proposed for multiplex PCR approaches to enhance biodiversity assessment.
• Guidelines for unified reporting of metadata are offered to facilitate inter-study comparisons.

Conclusions:

• Implementing synthetic spike-ins, multiplex PCR, and standardized metadata reporting will significantly improve the reliability and comparability of insect biodiversity data.
• These recommendations aim to foster joint quality and calibration standards across different laboratories and monitoring programs.
• The proposed framework supports the development of a global toolkit for insect biodiversity monitoring.