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Related Experiment Video

Updated: Oct 13, 2025

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Global gap-analysis of amphipod barcode library.

Anna Maria Jażdżewska1, Anne Helene S Tandberg2, Tammy Horton3

  • 1Department of Invertebrate Zoology and Hydrobiology, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland.

Peerj
|November 11, 2021
PubMed
Summary

DNA barcoding using cytochrome c oxidase (COI) is vital for monitoring biodiversity. However, the Amphipoda barcode library is incomplete, with only 10% of species represented, highlighting significant gaps in data for effective species identification.

Keywords:
CrustaceaDNA barcodingFreshwatersMarine realmSemi-terrestrialTaxonomic identification

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Area of Science:

  • Molecular Ecology and Biodiversity Research
  • Genomics and Bioinformatics for Conservation

Background:

  • Global climate change and biodiversity loss necessitate robust monitoring tools.
  • DNA barcoding, particularly using cytochrome c oxidase subunit I (COI), is a key method for species identification in Metazoa.
  • The reliability of DNA barcoding depends on comprehensive and accurate barcode libraries, such as those in the Barcode of Life Data System (BOLD).

Purpose of the Study:

  • To analyze public COI sequences in BOLD for the crustacean order Amphipoda.
  • To identify gaps in the existing amphipod barcode library.
  • To provide recommendations for future DNA barcoding studies in Amphipoda.

Main Methods:

  • Analysis of 25,702 public COI sequences from the Barcode of Life Data System (BOLD) for Amphipoda.
  • Evaluation of Barcode Index Numbers (BINs) for species recognition and identification accuracy.
  • Assessment of data distribution across marine and freshwater realms, geographical regions, and taxonomic families.

Main Results:

  • Only 10% of known amphipod species are represented by barcodes, despite 3,835 Barcode Index Numbers (BINs) identified.
  • Marine and freshwater realms show nearly equal contributions in records and BINs, but species-level identification is higher in freshwater BINs (75%) compared to marine (40%).
  • Vast geographical 'white gaps' exist, particularly in Africa, South America, and the open ocean; major families like Phoxocephalidae, Ampeliscidae, and Caprellidae are poorly represented.

Conclusions:

  • Significant gaps exist in the amphipod COI barcode library, limiting its utility for comprehensive biodiversity monitoring.
  • A majority of BINs lack sufficient sequences for reliability, and species identification accuracy varies greatly between environments and regions.
  • Future efforts should focus on identifying existing BINs, prioritizing underrepresented families and geographical areas, and implementing targeted sampling strategies.