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Testate amoeba transfer function performance along localised hydrological gradients.

Andrey N Tsyganov1, Olga A Mityaeva1, Yuri A Mazei2

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PubMed
Summary

Testate amoeba transfer functions reliably reconstruct peatland water tables, but performance decreases with depth due to decomposition and shell movement. Thorough validation is crucial for accurate paleo-hydrological reconstructions.

Keywords:
BogPalaeoecologyPalaeoenvironmental reconstructionPeatlandProtist

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Area of Science:

  • Paleoecology
  • Quaternary Science
  • Environmental Science

Background:

  • Testate amoeba transfer functions are standard for reconstructing past peatland hydrological regimes.
  • Validation and uncertainty assessment are increasingly critical for these methods.
  • Peatland type and sampling depth can influence transfer function performance.

Purpose of the Study:

  • To investigate how peatland type and sampling depth affect testate amoeba transfer function performance.
  • To assess transfer function robustness using an independent test-set.
  • To evaluate the impact of taphonomic processes on reconstruction accuracy.

Main Methods:

  • Utilized an independent test-set from four Sphagnum-dominated peatlands in European Russia.
  • Focused on transfer function performance along localized hydrological gradients.
  • Analyzed the influence of sampling depth and selective decomposition on results.

Main Results:

  • Transfer function performance on the independent test-set was weaker than cross-validation methods.
  • The function remained robust for reconstructing relative water-table depth changes with good analogues.
  • Performance decreased with subsurface samples due to decomposition, deep-dwelling taxa, and shell transfer.

Conclusions:

  • Thorough testing of transfer functions is essential for reliable paleo-hydrological reconstructions.
  • Taphonomic processes significantly impact the accuracy of testate amoeba-based reconstructions.
  • Further research into stratification, taxonomy, and taphonomy is needed to enhance transfer function robustness.