Biodiversity Assessment and Species Discovery through DNA Barcoding

The biodiversity crisis demands rapid identification and monitoring of species across ecosystems. DNA barcoding, which uses short, standardised gene sequences to discriminate taxa, has revolutionised biodiversity assessment and accelerated species discovery. By coupling polymerase chain reaction amplification of marker genes—commonly the mitochondrial cytochrome c oxidase I (COI) region—with high-throughput sequencing and robust reference libraries, researchers can characterise community composition, detect cryptic diversity and streamline taxonomic workflows. Recent advances in portable sequencing platforms, long-read technologies and bioinformatic pipelines have enhanced the resolution, portability and cost-efficiency of DNA-based surveys. Applications range from large-scale insect inventories and monitoring of invasive species to conservation planning and ecological forensics. Integration with metabarcoding approaches enables rapid assessment of bulk environmental samples, while megabarcoding and full-length ribosomal DNA amplicons improve phylogenetic context across broad taxonomic scales. Together, these innovations provide scalable solutions to document life’s diversity at regional to global levels and to prioritise efforts in biodiversity conservation.

Research from Nature Portfolio

Recent studies have employed standardised trapping and DNA barcoding to reveal patterns of insect community structure across biogeographical regions. One investigation of flying insects sampled over 225 000 specimens from multiple continents showed that a small subset of insect families accounted for over half of local species richness, despite extreme species turnover among sites. DNA barcodes were crucial for quantifying diversity in poorly studied “dark taxa” and for highlighting taxonomic neglect in hyperdiverse groups. This work emphasises the need for scalable, barcode-based approaches to target neglected lineages and to integrate biodiversity data across habitats and climates.

Biodiversity Assessment and Species Discovery through DNA Barcoding publication trend

The graph below shows the total number of articles in biodiversity assessment and species discovery through dna barcoding across all publications each year (not limited to Nature Index journals).

Technical terms

DNA barcoding: The use of a short, standardised gene region—typically mitochondrial COI—for identifying and discriminating species.

Metabarcoding: High-throughput sequencing of mixed environmental or bulk samples to assess community composition by recovering multiple DNA barcodes simultaneously.

Molecular operational taxonomic unit (mOTU): A proxy for species defined by DNA sequence similarity thresholds in barcoding studies.

Nanopore sequencing: A real-time, single-molecule sequencing technology that passes DNA through protein pores to determine nucleotide sequences, enabling portable and long-read applications.

Megabarcoding: Large-scale barcoding of thousands of specimens or environmental samples using high-throughput methods to accelerate biodiversity surveys.

References

1. Convergence of dominance and neglect in flying insect diversity. Nature Ecology & Evolution (2023).
2. Nanopore sequencing of long ribosomal DNA amplicons enables portable and simple biodiversity assessments with high phylogenetic resolution across broad taxonomic scale. GigaScience (2019).
3. Rapid, large-scale species discovery in hyperdiverse taxa using 1D MinION sequencing. BMC Biology (2019).
4. ONTbarcoder and MinION barcodes aid biodiversity discovery and identification by everyone, for everyone. BMC Biology (2021).