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Waller, Martyn; Carvalho, Fabio; Grant, Michael J.; Bunting, M. Jane; Brown, Kerry (2017)
Publisher: Elsevier
Languages: English
Types: Article
Subjects: geography
Thick deposits of peat derived from fen environments accumulated in the coastal lowland areas adjacent to the North Sea during the middle and late Holocene. These sediments are frequently used in pollen-based reconstructions of in situ and more distant vegetation. However, discriminating between wetland and dry land originating pollen signals, and between the potential fen communities present in the wetland, is complex. In this study, a suite of analytical approaches are used to explore the pollen signal of modern fen communities and compare them against Holocene pollen assemblages. At two sites in eastern England, Woodwalton Fen and Upton Broad, vegetation composition was recorded around a series of moss polster sampling points. The communities investigated included herbaceous fen communities under different cutting regimes, a grazed area, glades, and woodland with canopies dominated by Alnus glutinosa and Betula. Cluster analysis is used to provide an overview of, and compare the structure within, the datasets consisting of the vegetation, the vegetation converted to palynological equivalents, and the pollen data. It is demonstrated that any loss of taxonomic precision in pollen identifications does not pose particular problems when attempting to identify fen communities, including tall-herbaceous vegetation, in the pollen record. Indices of Association imply pollen presence can be interpreted as indicating the local presence for some taxa, though few of these are confined to a particular community. Herbaceous fen vegetation subject to different management regimes are, however, shown to produce distinctive pollen signatures. Middle and late Holocene pollen assemblages from eastern (Fenland) and southern (Romney Marsh) England, interpreted as derived from fen vegetation, are compared against the modern pollen dataset using ordination. Most of the fossil samples plot out within or adjacent to the groupings produced by the modern samples in the ordinations. While these investigations demonstrate that modern pollen work can help improve the interpretation of Holocene assemblages they also call attention to a number of limitations including the restricted range of communities from which modern samples are currently available and the potential for non-analogous modern vegetation. The paper concludes with ideas to aid the interpretation of pollen data collected from fen peats and suggestions for future work.
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    • Waller, M.P., Long, A.J., Long, D., Innes, J.B., 1999. Patterns and processes in the development of coastal mire vegetation: Multi-site investigations from Walland Marsh, Southeast England. Quat. Sci. Rev. 18, 1419-1444.
    • Waller, M.P., Schofield, J.E., 2007. Mid to Late Holocene vegetation and land use history in the Weald of South-Eastern England: multiple pollen profiles from the Rye Area. Veg. Hist.
    • Archaeobot. 16, 367-384.
    • Weigers, J., 1992. Carr vegetation: plant communities and succession of the dominant tree species. In: Verhoeven, J.T.A. (Ed), Fens and Bogs in the Netherlands: Vegetation, History, Nutrient Dynamics and Conservation. Dordrecht, Kluwer, 361-396.
    • Wheeler, B.D., 1980a. Plant communities of rich-fen systems in England and Wales. III. Fen meadow, fen grassland and fen woodland communities and contact communities. J. Ecol.
    • Wheeler, B.D., 1980b. Plant Communities of rich-fen systems in England and Wales: I.
    • Introduction. Tall Sedge and Reed Communities. J. Ecol. 68, 365-395.
    • Wheeler, B.D., and Proctor, M.C.F., 2000. Ecological gradients, subdivisions and terminology of north-west European mires. J. Ecol. 88, 187-203.
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