Poor fen succession over ombrotrophic peat related to late Holocene increased surface wetness in subarctic Quebec, Canada

Authors

  • SIMON VAN BELLEN,

    Corresponding author
    1. Chair on Peatland Ecosystems Dynamics and Climatic Change, and GEOTOP - Geochemistry and Geodynamics Research Center, Université du Québec à Montréal, Canada
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    • Present Address: School of Geosciences, University of Aberdeen, AB24 3UF
  • MICHELLE GARNEAU,

    1. Chair on Peatland Ecosystems Dynamics and Climatic Change, and GEOTOP - Geochemistry and Geodynamics Research Center, Université du Québec à Montréal, Canada
    2. Département de Géographie, Université du Québec à Montréal, Canada
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  • ADAM A. ALI,

    1. Chair on Peatland Ecosystems Dynamics and Climatic Change, and GEOTOP - Geochemistry and Geodynamics Research Center, Université du Québec à Montréal, Canada
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    • Present Address: Centre for Bio-Archaeology and Ecology (UMR5059 CNRS), Université Montpellier 2, France.
  • ALEXANDRE LAMARRE,

    1. Chair on Peatland Ecosystems Dynamics and Climatic Change, and GEOTOP - Geochemistry and Geodynamics Research Center, Université du Québec à Montréal, Canada
    2. Département de Géographie, Université du Québec à Montréal, Canada
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  • ÉLISABETH C. ROBERT,

    1. Centre d'études nordiques, Université Laval, Canada
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  • GABRIEL MAGNAN,

    1. Chair on Peatland Ecosystems Dynamics and Climatic Change, and GEOTOP - Geochemistry and Geodynamics Research Center, Université du Québec à Montréal, Canada
    2. Institut des sciences de l'environnement, Université du Québec à Montréal, Canada
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  • HANS ASNONG,

    1. Chair on Peatland Ecosystems Dynamics and Climatic Change, and GEOTOP - Geochemistry and Geodynamics Research Center, Université du Québec à Montréal, Canada
    2. Département de Géographie, Université du Québec à Montréal, Canada
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  • STEVE PRATTE

    1. Chair on Peatland Ecosystems Dynamics and Climatic Change, and GEOTOP - Geochemistry and Geodynamics Research Center, Université du Québec à Montréal, Canada
    2. Département des sciences de la terre et de l'atmosphère, Université du Québec à Montréal, Canada
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ABSTRACT

Northern peatlands act as archives of environmental change through their sensitivity to water balance fluctuations, while being significant contributors to global greenhouse gas dynamics. Subarctic fens in north-eastern Canada are characterized by a dominance of pools and flarks. We aimed to reconstruct the late Holocene hydrological conditions of these fens to establish the timing of the initiation of pool and flark formation and possible links with climate. Testate amoebae and plant macrofossils from five cores, sampled in three fens, were analysed to infer water tables with chronologies based on 14C and 210Pb dating. All sites showed the presence of relatively dry, ombrotrophic conditions with abundant Picea from 5000 cal a BP, followed by a first shift to wet, poor fen conditions with pool and flark development around 3000 cal a BP and a subsequent wet shift after ∼800 cal a BP. These trends coincide with previously observed Neoglacial and Little Ice Age cooler and wetter conditions and therefore climate may well have been a dominant factor in the initiation and development of pools and flarks over the late Holocene. The effect of anticipated climate change on subarctic peatlands remains unclear, although wetter conditions might enhance pool expansion to the detriment of terrestrial components.

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