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Environmental DNA reflects spatial and temporal jellyfish distribution.

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Environmental DNA (eDNA) analysis is now feasible for marine jellyfish. This study demonstrates eDNA detection and quantification for Japanese sea nettle, showing its potential for ecological surveys.

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Area of Science:

  • Marine biology
  • Environmental DNA (eDNA) analysis
  • Molecular ecology

Background:

  • Environmental DNA (eDNA) analysis offers a non-invasive method for surveying aquatic organisms.
  • Previous research has not established eDNA detection or quantification methods for jellyfish species.
  • Marine jellyfish pose challenges for traditional survey methods due to their distribution and life cycles.

Purpose of the Study:

  • To establish the first environmental DNA (eDNA) analysis method for marine jellyfish.
  • To investigate the temporal dynamics of eDNA concentration in relation to jellyfish presence.
  • To assess the spatial distribution of eDNA and its correlation with jellyfish populations.

Main Methods:

  • A tank experiment was conducted to monitor eDNA concentrations over time after introducing Japanese sea nettle (Chrysaora pacifica).
  • Quantitative real-time PCR (qPCR) was used to quantify eDNA concentrations.
  • Field surveys involved collecting water samples (surface and seafloor) at multiple sites and times for eDNA analysis and visual jellyfish counts.

Main Results:

  • eDNA concentrations peaked at 1 and 8 hours post-introduction in the tank experiment, stabilizing within 48 hours.
  • Estimated eDNA release rates for jellyfish were higher than those reported for fish.
  • Spatial surveys showed eDNA distribution correlated with visual jellyfish counts, with higher concentrations in seafloor water (~13x surface).
  • Temporal surveys revealed a strong correlation between eDNA concentration patterns and observed jellyfish numbers throughout the year.

Conclusions:

  • Environmental DNA (eDNA) analysis is a viable and effective method for detecting and quantifying marine jellyfish populations.
  • The developed eDNA approach can be applied to jellyfish species for ecological monitoring and distribution studies.
  • This method provides a cost-effective and efficient alternative to traditional visual surveys for jellyfish.