Pollen-Based Ecology and Biodiversity Dynamics

Pollen-based ecology employs the analysis of fossil pollen grains preserved in sedimentary archives to reconstruct past vegetation communities, track shifts in species distributions and assess long-term biodiversity dynamics. By integrating palynological data with environmental proxies and modelling approaches, researchers gain insights into the drivers of ecological change over millennial timescales, including climate fluctuations, human land-use and biotic interactions. This field underpins macroecological syntheses that reveal how diversity gradients have formed and responded to warming, deforestation and agricultural expansion. Standardisation of pollen nomenclature, advances in numerical methods and expansion of open-access databases now allow for reproducible, large-scale reconstructions. Such work informs conservation strategies by illuminating the resilience and vulnerability of ecosystems under past and future environmental stressors.

Research from Nature Portfolio

Recent work using European Holocene pollen assemblages has tested the response of the latitudinal diversity gradient to postglacial warming. Contrary to expectations that warming would flatten diversity gradients, analyses show that mid to high-latitude plant richness declined during early Holocene forest closure, strengthening the gradient. Subsequent human deforestation and agricultural activity in the last five millennia exerted a greater influence on richness patterns than climate alone. These findings underscore the overriding impact of non-climatic anthropogenic disturbances on regional biodiversity trajectories.

Pollen-Based Ecology and Biodiversity Dynamics publication trend

The graph below shows the total number of articles in pollen-based ecology and biodiversity dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Pollen assemblage: The complete set of pollen types preserved in a sediment sample, reflecting the composition of surrounding vegetation.

Biodiversity gradient: Spatial variation in species richness or diversity, often observed along climatic or latitudinal transects.

Relative pollen productivity (RPP): A correction factor that accounts for interspecific differences in pollen output and dispersal when quantifying past vegetation from pollen percentages.

Pollen taxonomic harmonisation: The process of standardising pollen nomenclature and taxonomic resolution across multiple sedimentary records to enable comparative analyses.

Macroecology: The study of ecological patterns and processes at large spatial and temporal scales, frequently informed by palaeoecological proxies such as fossil pollen.

References

1. Anthropogenic pollen indicators: Global food plants and Latin American human indicators in the pollen record. Scientific Data (2023).
2. A guide to the processing and standardization of global palaeoecological data for large‐scale syntheses using fossil pollen. Global Ecology and Biogeography (2023).
3. Postglacial change of the floristic diversity gradient in Europe. Nature Communications (2019).
4. Approaches to pollen taxonomic harmonisation in Quaternary palynology. Review of Palaeobotany and Palynology (2023).