Cited by 36Environmental DNA in Biodiversity StudiesInvertebrate Taxonomy and EcologyIdentification and Quantification in Food

Disentangling bias for non-destructive insect metabarcoding

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Martoni, Francesco, Piper, Alexander M., Rodoni, Brendan C., Blacket, Mark J.·2022·PeerJ

Abstract

A fast and reliable method for obtaining a species-level identification is a fundamental requirement for a wide range of activities, from plant protection and invasive species management to biodiversity assessments and ecological studies. For insects, novel molecular techniques such as DNA metabarcoding have emerged as a rapid alternative to traditional morphological identification, reducing the dependence on limited taxonomic experts. Until recently, molecular techniques have required a destructive DNA extraction, precluding the possibility of preserving voucher specimens for future studies, or species descriptions. Here we paired insect metabarcoding with two recent non-destructive DNA extraction protocols, to obtain a rapid and high-throughput taxonomic identification of diverse insect taxa while retaining a physical voucher specimen. The aim of this work was to explore how non-destructive extraction protocols impact the semi-quantitative nature of metabarcoding, which alongside species presence/absence also provides a quantitative, but biased, representation of their relative abundances. By using a series of mock communities representing each stage of a typical metabarcoding workflow we were able to determine how different morphological ( i.e ., insect biomass and exoskeleton hardness) and molecular traits ( i.e ., primer mismatch and amplicon GC%), interact with different protocol steps to introduce quantitative bias into non-destructive metabarcoding results. We discuss the relevance of taxonomic bias to metabarcoding identification of insects and potential approaches to account for it.

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  • Even species belonging to the same genus may be differently impacted by the same DNA extraction/amplification/sequencing procedure, generating a difference in read numbers, which may result in loss of rare species.

    “Here even species belonging to the same genus may be differently impacted by the same DNA extraction/amplification/sequencing procedure, generating a difference in read numbers, which may result in loss of rare species66.”

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Authors
Martoni, F., Piper, A. M., Rodoni, B. C., & Blacket, M. J.
Affiliations
  • Government of Victoria (AU)
  • La Trobe University (AU)
Corresponding author
Martoni, Francesco
Venue
PeerJ
Publisher
PeerJ
Published
2022-02-23
Volume
10
Pages
e12981
ISSN
2167-8359 (ISSN-L)
OpenAlex
W4214699497
Cited by
36
References
55
Citations by year
2026: 6 · 2025: 6 · 2024: 6 · 2023: 15 · 2022: 3
FWCI
4.00
Type
journal article
Language
en
Open access
Locations
  • PeerJ (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • La Trobe University (cc-by)
Funders
  • iMapPESTS project
  • Horticulture Innovation Australia (ST16010)
  • Australian Government Department of Agriculture as part of its Rural R & D for Profit program
  • Grain Research Development Corporation
Topics
  • Physical Sciences › Environmental Science › Ecology › Environmental DNA in Biodiversity Studies
  • Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Invertebrate Taxonomy and Ecology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Identification and Quantification in Food
Keywords
non-destructive DNA extraction, taxonomic bias, mock communities, voucher specimens, primer mismatch, insect biomass, species identification, bias correction
MeSH terms
Animals, DNA, Insecta, Plants, Biodiversity, DNA Barcoding, Taxonomic

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