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Evaluating freshwater macroinvertebrates from eDNA metabarcoding: A river Nalón case study.

Sara Fernández1, Saúl Rodríguez1, Jose L Martínez2

  • 1Department of Functional Biology, University of Oviedo, Oviedo, Asturias, Spain.

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Metabarcoding, a DNA-based method, offers a sensitive alternative for assessing river health by identifying benthic macroinvertebrates. While initially more costly, it reduces sampling and identification efforts for freshwater quality monitoring.

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Area of Science:

  • Environmental Science
  • Molecular Biology
  • Ecology

Background:

  • Rivers are crucial for human well-being, necessitating effective management strategies.
  • The European Union's Water Framework Directive (WFD) mandates sustainable water body protection.
  • Benthic macroinvertebrates are key bioindicators, but conventional assessment methods face cost-efficiency limitations.

Purpose of the Study:

  • To evaluate the reliability of metabarcoding for river macroinvertebrate assessment.
  • To compare metabarcoding with conventional methods for freshwater quality monitoring.
  • To assess the cost-benefit of using metabarcoding as a bioindicator tool.

Main Methods:

  • In vitro validation using a mock community.
  • Field validation using environmental DNA (eDNA) from six sites in the River Nalón, Spain.
  • Amplification and sequencing of two markers (18S rDNA V4 and mitochondrial COI) on an Illumina platform.

Main Results:

  • Metabarcoding demonstrated higher sensitivity compared to visual assessment methods.
  • The study identified macroinvertebrate communities in river water samples.
  • Cost-benefit analysis indicated metabarcoding is more expensive upfront but reduces sampling and identification efforts.

Conclusions:

  • Metabarcoding is a sensitive and potentially valuable tool for assessing freshwater quality.
  • This molecular technique offers an alternative to traditional bioindicator assessments.
  • Further adoption of metabarcoding can enhance river health monitoring programs.