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Sampling optimization for biomonitoring metal contamination with marine macroalgae.

R García-Seoane1, J A Fernández1, Z Varela1

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Summary

Optimizing marine macroalgae sampling protocols is crucial for effective heavy metal biomonitoring. A minimum of 30 evenly distributed Fucus vesiculosus subsamples per site, analyzed as a composite, ensures representative heavy metal concentration data.

Keywords:
BiomonitoringMarine pollutionMetalsSemivariogramSpatial variability

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Area of Science:

  • Marine Ecology
  • Environmental Chemistry
  • Biomonitoring

Background:

  • Marine ecosystems face heavy metal contamination.
  • Macroalgae, such as Fucus vesiculosus, are effective biomonitors.
  • Standardized sampling protocols are needed for accurate heavy metal assessment.

Purpose of the Study:

  • To optimize sampling protocols for marine macroalgae (Fucus vesiculosus) for heavy metal biomonitoring.
  • To determine the optimal number and distribution of subsamples for representative analysis.
  • To assess spatial variability of heavy metal concentrations within sampling sites.

Main Methods:

  • Collection of 50 subsamples of Fucus vesiculosus from three distinct sampling sites.
  • Determination of elemental concentrations (Al, As, Cd, Co, Cr, Cu, Fe, Hg, N, Ni, Pb, Zn) and stable isotopes (δ15N).
  • Application of semivariogram analysis to investigate spatial structures in element concentrations.

Main Results:

  • Spatial structure in element concentrations was detected in 88% of semivariograms.
  • Element concentrations exhibited significant longitudinal and transversal variations within sampling sites.
  • Randomization techniques indicated a minimum of 30 evenly distributed subsamples are necessary.

Conclusions:

  • A revised protocol recommends collecting at least 30 evenly distributed Fucus vesiculosus subsamples within three coastal bands per site.
  • Analyzing these subsamples as a single composite sample accurately reflects intra-site variability.
  • This optimized protocol enhances the reliability of heavy metal biomonitoring in marine environments.