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Related Experiment Video

Updated: Feb 27, 2026

Use of a Filter Cartridge for Filtration of Water Samples and Extraction of Environmental DNA
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Assessment of Freshwater Unionidae Using Environmental DNA Metabarcoding in Lentic Ecosystems: Implications for

Keonhee Kim1, Junhee Kwon2, Kyujin Kim2

  • 1Human and Ecocare Center, Konkuk University, Seoul 05029, Republic of Korea.

Biology
|February 26, 2026
PubMed
Summary

Environmental DNA (eDNA) metabarcoding effectively detects freshwater mussels in lakes. Spatial factors, not season, influence eDNA distribution, offering insights for benthic invertebrate sampling strategies.

Keywords:
environmental DNA (eDNA)freshwater musselslentic ecosystemsmetabarcodingsampling strategyspatial distributionunionidae

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Area of Science:

  • Aquatic ecology
  • Molecular ecology
  • Conservation biology

Background:

  • Environmental DNA (eDNA) metabarcoding is a key tool for non-invasive aquatic organism detection.
  • Optimal sampling strategies for benthic species in lakes using eDNA are not well-defined.

Purpose of the Study:

  • To assess eDNA metabarcoding for detecting freshwater Unionidae mussels in lake water columns.
  • To investigate the spatial and seasonal distribution patterns of Unionidae mussels using eDNA.

Main Methods:

  • Validated a mitochondrial 16S rDNA mini-barcode primer for unionid mussels.
  • Collected eDNA samples from four lakes across littoral and central zones (surface, mid, bottom) in autumn and winter.
  • Analyzed eDNA using metabarcoding to identify Unionidae taxa and quantify reads.

Main Results:

  • Identified 79 ASVs representing four unionid taxa, with Cristaria plicata and Sinanodonta lauta dominant.
  • No significant seasonal differences in Unionidae eDNA reads were observed.
  • eDNA reads were lower in littoral zones than central lake areas; spatial variation, not depth, was significant.

Conclusions:

  • Freshwater mussel eDNA distribution in lakes is driven by spatial factors like habitat and hydrodynamics, not seasonal changes during stable periods.
  • Findings provide practical guidance for optimizing eDNA sampling strategies for benthic invertebrates in lentic systems.