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Pollen richness: a reflection of vegetation diversity or pollen-specific parameters?

Abstract

Our study aims to increase the understanding about the impacts of potential drivers of pollen richness by using a pollen-vegetation modelling approach. We used the Sutton-Prentice dispersal model implemented in the HUMPOL software suite to explore the effects of factors commonly associated with pollen richness: vegetation diversity (plant richness and evenness), land-cover characteristics (patch richness, evenness and size, and basin size) and pollen-related parameters (productivity and fall speed). The impact of the factors was tested using modelling scenarios involving all combinations of the included factors and their values. All tested factors had a statistically significant impact on modelled pollen richness. Pollen-type based plant richness was the dominant determinant of pollen richness; however, pollen productivity became co-dominant at higher plant richness levels, effectively limiting the detection of species with low pollen productivity. The fall speed of pollen and sedimentary basin size had moderate impact, but gained importance in simulations with elevated plant richness. In patchy land-cover, patch richness was the most significant determinant of pollen richness, while patch evenness and size were the least important factors. Our modelling approach provides insights into the significance of common factors in determining pollen richness and its connection to plant diversity, as well as a theoretical basis for understanding the substantial variation among earlier empirical pollen-plant richness studies. The estimation of plant richness from pollen richness in past vegetation diversity studies could be improved by the separation of taxa with low and high pollen productivity and an awareness of the pollen source area.

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Data availability

Data used in modelling are available in Supporting Information.

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Acknowledgements

We thank Martin Theuerkauf for valuable comments, which improved the manuscript considerably, and Anna Aader for linguistic improvements.

Funding

V.V. and Ü.V. were supported by the Estonian University of Life Sciences institutional project P180271PKEL. The position of A.P. was funded by the Estonian Research Council grants PRG323.

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Contributions

VV designed the methodology, carried out the modelling and drafted the manuscript; BVO conceived the general idea and research questions with AP; ÜV conducted the statistical analyses and drafted graphs; AP designed the figures. All authors contributed critically to the draft and gave final approval.

Corresponding author

Correspondence to Vivika Väli.

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The authors declare that they have no conflict of interest.

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Communicated by T. Giesecke.

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Väli, V., Odgaard, B.V., Väli, Ü. et al. Pollen richness: a reflection of vegetation diversity or pollen-specific parameters?. Veget Hist Archaeobot (2022). https://doi.org/10.1007/s00334-022-00879-w

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  • DOI: https://doi.org/10.1007/s00334-022-00879-w

Keywords

  • Pollen–plant richness relationship
  • Pollen richness
  • HUMPOL
  • Pollen productivity
  • Pollen fall speed