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Comparing diversity levels in environmental samples: DNA sequence capture and metabarcoding approaches using 18S and
Hendrik Giebner1, Kathrin Langen1, Sarah J Bourlat1
1Zoological Research Museum Alexander Koenig (ZFMK), Leibniz-Institute for Animal Biodiversity, Bonn, Germany.
Molecular Ecology Resources
|May 29, 2020
Summary
Environmental DNA (eDNA) metabarcoding and DNA sequence capture both reliably detect species diversity. DNA sequence capture, while more expensive, identifies significantly more species and genera, especially for the COI and 18S gene regions.
Area of Science:
- Environmental DNA (eDNA) analysis
- Biodiversity assessment
- Molecular ecology
Background:
- Metabarcoding is a powerful tool for assessing species diversity from environmental samples.
- Key limitations of metabarcoding include primer bias and challenges in detecting rare species.
- DNA sequence capture offers an alternative approach for eDNA analysis.
Purpose of the Study:
- To compare the effectiveness of DNA sequence capture against traditional metabarcoding for eDNA biodiversity assessments.
- To evaluate the performance of amplicon sequence variants (ASVs) and operational taxonomic units (OTUs) in data analysis.
- To determine the advantages and disadvantages of each method for species identification.
Main Methods:
- Environmental DNA samples were analyzed using both metabarcoding and DNA sequence capture techniques.
- Both methods targeted the 18S and COI gene regions, followed by high-throughput sequencing.
- In silico analysis compared ASVs and OTUs using metabarcoding data for both markers.
Main Results:
- Both metabarcoding and DNA sequence capture recovered 80-90% of species from control samples.
- DNA sequence capture identified 1.5x more species (COI) and 13x more genera (18S) than metabarcoding.
- ASV analysis detected more species for COI, while OTU clustering with relaxed thresholds potentially biased 18S richness.
Conclusions:
- Both eDNA metabarcoding and DNA sequence capture provide reliable biodiversity data.
- DNA sequence capture, despite higher costs and time investment, offers superior taxonomic resolution.
- Combining nuclear (18S) and mitochondrial (COI) markers enhances overall taxa recovery in eDNA studies.
Keywords:
18S and COI ampliconsASVsDNA sequence captureOTUsdada2eDNAeukaryotic diversitymetabarcodingMore Related Videos
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