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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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The Floating Lab: Standard Operational Procedure for Collecting and Filtering Seawater Samples from Operating Ferries for Environmental DNA Analysis
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Environmental barcoding: a next-generation sequencing approach for biomonitoring applications using river benthos.

Mehrdad Hajibabaei1, Shadi Shokralla, Xin Zhou

  • 1Biodiversity Institute of Ontario, Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada. mhajibab@uoguelph.ca

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Next-generation sequencing (NGS) using 454 pyrosequencing offers a powerful tool for DNA-based biodiversity analysis in biomonitoring. This environmental DNA barcoding approach accurately identifies abundant species and shows potential for detecting rare species in freshwater macroinvertebrate samples.

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Area of Science:

  • Environmental Science
  • Molecular Biology
  • Ecology

Background:

  • Morphology-based identification of bioindicator taxa is time-consuming and lacks species-level resolution, hindering effective biomonitoring.
  • DNA barcoding and molecular phylogenetics offer alternative approaches, with DNA barcode reference libraries forming the basis for DNA-based identification systems.
  • Next-generation sequencing (NGS) technologies promise to significantly expand the application of DNA information in biodiversity science for routine biomonitoring.

Purpose of the Study:

  • To demonstrate the feasibility of using 454 massively parallel pyrosequencing for species-level analysis of freshwater benthic macroinvertebrates.
  • To compare the efficacy of morphology-based identification, Sanger sequencing DNA barcoding, and next-generation environmental barcoding.
  • To assess the potential of NGS for routine biomonitoring applications.

Main Methods:

  • Utilized 454 massively parallel pyrosequencing for mini-barcode analysis of pooled freshwater benthic macroinvertebrate samples.
  • Compared results with traditional morphology-based identification and Sanger sequencing DNA barcoding.
  • Applied the environmental barcoding approach to compare macroinvertebrates from urban and conservation areas.

Main Results:

  • 454 pyrosequencing accurately identified all species representing more than 1% abundance in the pooled mixture.
  • The method failed to identify 6 rare species but detected sequences from 9 species not initially present in the physical sample.
  • Environmental barcoding successfully differentiated macroinvertebrate communities between urban and conservation areas.

Conclusions:

  • 454 pyrosequencing of mini-barcodes is a feasible approach for species-level biodiversity analysis in biomonitoring.
  • Environmental DNA barcoding using NGS holds significant potential for enhancing biomonitoring programs, particularly in detecting rare species and analyzing bulk samples.
  • Further optimization of NGS tools is necessary for robust species identification from environmental samples, but the approach shows great promise for large-scale biomonitoring.