Evaluating the use of testate amoebae for palaeohydrological reconstruction in permafrost peatlands
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Evaluating the use of testate amoebae for palaeohydrological reconstruction in permafrost peatlands. / Swindles, Graeme T.; Amesbury, Matthew J.; Turner, T. Edward; Carrivick, Jonathan L.; Woulds, Clare; Raby, Cassandra; Mullan, Donal; Roland, Thomas P.; Galloway, Jennifer M.; Parry, Lauren; Kokfelt, Ulla; Garneau, Michelle; Charman, Dan J.; Holden, Joseph.
I: Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences, Bind 424, 2015, s. 111-122.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Evaluating the use of testate amoebae for palaeohydrological reconstruction in permafrost peatlands
AU - Swindles, Graeme T.
AU - Amesbury, Matthew J.
AU - Turner, T. Edward
AU - Carrivick, Jonathan L.
AU - Woulds, Clare
AU - Raby, Cassandra
AU - Mullan, Donal
AU - Roland, Thomas P.
AU - Galloway, Jennifer M.
AU - Parry, Lauren
AU - Kokfelt, Ulla
AU - Garneau, Michelle
AU - Charman, Dan J.
AU - Holden, Joseph
N1 - CENPERM[2015]
PY - 2015
Y1 - 2015
N2 - The melting of high-latitude permafrost peatlands is a major concern due to a potential positive feedback on global climate change. We examine the ecology of testate amoebae in permafrost peatlands, based on sites in Sweden (similar to 200 km north of the Arctic Circle). Multivariate statistical analysis confirms that water-table depth and moisture content are the dominant controls on the distribution of testate amoebae, corroborating the results from studies in mid-latitude peatlands. We present a new testate amoeba-based water table transfer function and thoroughly test it for the effects of spatial autocorrelation, clustered sampling design and uneven sampling gradients. We find that the transfer function has good predictive power; the best-performing model is based on tolerance-downweighted weighted averaging with inverse deshrinking (performance statistics with leave-one-out cross validation: R-2 = 0.87, RMSEP = 5.25 cm). The new transfer function was applied to a short core from Stordalen mire, and reveals a major shift in peatland ecohydrology coincident with the onset of the Little Ice Age (c. AD 1400). We also applied the model to an independent contemporary dataset from Stordalen and find that it outperforms predictions based on other published transfer functions. The new transfer function will enable palaeohydrological reconstruction from permafrost peatlands in Northern Europe, thereby permitting greatly improved understanding of the long-term ecohydrological dynamics of these important carbon stores as well as their responses to recent climate change. (C) 2015 Elsevier B.V. All rights reserved.
AB - The melting of high-latitude permafrost peatlands is a major concern due to a potential positive feedback on global climate change. We examine the ecology of testate amoebae in permafrost peatlands, based on sites in Sweden (similar to 200 km north of the Arctic Circle). Multivariate statistical analysis confirms that water-table depth and moisture content are the dominant controls on the distribution of testate amoebae, corroborating the results from studies in mid-latitude peatlands. We present a new testate amoeba-based water table transfer function and thoroughly test it for the effects of spatial autocorrelation, clustered sampling design and uneven sampling gradients. We find that the transfer function has good predictive power; the best-performing model is based on tolerance-downweighted weighted averaging with inverse deshrinking (performance statistics with leave-one-out cross validation: R-2 = 0.87, RMSEP = 5.25 cm). The new transfer function was applied to a short core from Stordalen mire, and reveals a major shift in peatland ecohydrology coincident with the onset of the Little Ice Age (c. AD 1400). We also applied the model to an independent contemporary dataset from Stordalen and find that it outperforms predictions based on other published transfer functions. The new transfer function will enable palaeohydrological reconstruction from permafrost peatlands in Northern Europe, thereby permitting greatly improved understanding of the long-term ecohydrological dynamics of these important carbon stores as well as their responses to recent climate change. (C) 2015 Elsevier B.V. All rights reserved.
KW - Permafrost
KW - Peatlands
KW - Palaeohydrology
KW - Testate amoebae
KW - Transfer function
KW - Arctic
U2 - 10.1016/j.palaeo.2015.02.004
DO - 10.1016/j.palaeo.2015.02.004
M3 - Journal article
VL - 424
SP - 111
EP - 122
JO - Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences
JF - Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences
SN - 0031-0182
ER -
ID: 140717690