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There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
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Use of a Filter Cartridge for Filtration of Water Samples and Extraction of Environmental DNA
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Environmental DNA Detects Endangered Texas Hornshell and Its Hosts.

Daniel H Mason1, Heidi A Henderson1, Thomas W Franklin1

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Summary

Environmental DNA (eDNA) assays offer a sensitive method for detecting rare freshwater mussels and their fish hosts. This research developed new quantitative PCR (qPCR) tools to aid conservation of imperiled aquatic species.

Keywords:
Rio Grandeblue suckerfreshwater musselgray redhorsequantitative PCR

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Development and Testing of Species-specific Quantitative PCR Assays for Environmental DNA Applications
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Area of Science:

  • Aquatic ecology
  • Conservation genetics
  • Molecular ecology

Background:

  • Freshwater mussels (unionids) are among North America's most imperiled aquatic species.
  • Traditional survey methods struggle to detect rare, cryptic, and low-density mussel populations.
  • Mussel population persistence depends on the presence of viable fish host species.

Purpose of the Study:

  • To develop novel quantitative PCR (qPCR) assays for detecting the endangered Texas hornshell (Popenaias popeii).
  • To develop qPCR assays for two critical fish host species: gray redhorse (Moxostoma congestum) and blue sucker (Cycleptus elongatus).
  • To provide improved tools for monitoring and conserving imperiled freshwater mussels and their hosts using environmental DNA (eDNA).

Main Methods:

  • Development of species-specific quantitative PCR (qPCR) assays.
  • Validation of assays using environmental DNA (eDNA) samples from streams.
  • Focus on detecting endangered unionids and their associated fish species.

Main Results:

  • Novel qPCR assays were successfully developed for the Texas hornshell, gray redhorse, and blue sucker.
  • The developed assays demonstrated high sensitivity and species specificity.
  • eDNA samples collected from streams were used to validate the effectiveness of the assays.

Conclusions:

  • The novel qPCR assays provide effective tools for detecting and monitoring imperiled freshwater mussels and their fish hosts.
  • Environmental DNA (eDNA) offers a powerful alternative to traditional methods for surveying rare aquatic species.
  • These tools can significantly aid conservation efforts for vulnerable unionid populations and their ecosystems.