A method for reconstructing temporal changes in vegetation functional trait composition using Holocene pollen assemblages.pdf (2.12 MB)
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A method for reconstructing temporal changes in vegetation functional trait composition using Holocene pollen assemblages.

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journal contribution
posted on 24.06.2019, 08:36 by F Carvalho, KA Brown, MP Waller, MJ Bunting, A Boom, MJ Leng
Methods of reconstructing changes in plant traits over long time scales are needed to understand the impact of changing environmental conditions on ecosystem processes and services. Although Holocene pollen have been extensively used to provide records of vegetation history, few studies have adopted a functional trait approach that is pertinent to changes in ecosystem processes. Here, for woody and herbaceous fen peatland communities, we use modern pollen and vegetation data combined with pollen records from Holocene deposits to reconstruct vegetation functional dynamics. The six traits chosen (measures of leaf area-to-mass ratio and leaf nutrient content) are known to modulate species' fitness and to vary with changes in ecosystem processes. We fitted linear mixed effects models between community weighted mean (CWM) trait values of the modern pollen and vegetation to determine whether traits assigned to pollen types could be used to reconstruct traits found in the vegetation from pollen assemblages. We used relative pollen productivity (RPP) correction factors in an attempt to improve this relationship. For traits showing the best fit between modern pollen and vegetation, we applied the model to dated Holocene pollen sequences from Fenland and Romney Marsh in eastern and southern England and reconstructed temporal changes in trait composition. RPP adjustment did not improve the linear relationship between modern pollen and vegetation. Leaf nutrient traits (leaf C and N) were generally more predictable from pollen data than mass-area traits. We show that inferences about biomass accumulation and decomposition rates can be made using Holocene trait reconstructions. While it is possible to reconstruct community-level trends for some leaf traits from pollen assemblages preserved in sedimentary archives in wetlands, we show the importance of testing methods in modern systems first and encourage further development of this approach to address issues concerning the pollen-plant abundance relationship and pollen source area.

Funding

F.C. was funded through a PhD studentship from the Faculty of Sciences, Engineering and Computing at Kingston University London. Field work and laboratory analyses were supported by the Department of Geography and Geology at Kingston University London.

History

Citation

PLoS ONE, 2019, 14(5): e0216698

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/School of Geography, Geology and the Environment/Physical Geography

Version

VoR (Version of Record)

Published in

PLoS ONE

Publisher

Public Library of Science

eissn

1932-6203

Acceptance date

28/04/2019

Copyright date

2019

Available date

24/06/2019

Publisher version

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0216698

Notes

The plant leaf trait data (S1 Data File) and the vegetation abundance data (S2 Data File) are within the paper's Supporting Information files. The modern pollen data are available at the European Modern Pollen Database (https://epdweblog.org/european-modern-pollen-database/) and the Holocene pollen data are available at the European Pollen Database (http://www.europeanpollendatabase.net/index.php), with the exception of the Brookland site data.

Language

en

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