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Future climate change necessitates understanding continentality shifts. This study shows chironomid (insect) larvae assemblages can reconstruct past continentality using the Kerner Oceanity Index (KOI).

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Area of Science:

  • Paleoclimatology
  • Ecology
  • Biogeography

Background:

  • Continentality, a measure of temperature and precipitation extremes, is projected to change significantly.
  • Reconstructing past continentality is limited by a lack of long-term data.
  • Chironomid assemblages are sensitive to environmental conditions, suggesting potential for palaeoclimate reconstructions.

Purpose of the Study:

  • To assess the influence of continentality on modern chironomid assemblages.
  • To evaluate the ecological relevance of chironomids for reconstructing past continentality.
  • To develop a chironomid-based proxy for palaeocontinentality.

Main Methods:

  • Studied 53 lakes across the East European Plain and southern Scandinavia.
  • Utilized redundancy analysis to link chironomid assemblages with environmental parameters, including continentality indices (annual temperature range and Kerner Oceanity Index).
  • Applied weighted averaging-partial least squares regression for palaeocontinentality reconstruction modeling.

Main Results:

  • The Kerner Oceanity Index (KOI) was the most significant predictor of chironomid assemblages (18.4% explanatory power) and showed no collinearity with other variables.
  • Specific chironomid morphotypes demonstrated clear preferences for either continental or oceanic climates.
  • A trial model using weighted averaging-partial least squares regression yielded promising results (R² = 0.73, RMSEP = 5.1) for KOI reconstruction.

Conclusions:

  • Chironomid assemblages are strongly influenced by continentality.
  • Chironomid data show significant potential as a proxy for reconstructing past continentality.
  • Further development of chironomid-based palaeocontinentality reconstructions is warranted.