Past vegetation assemblages, preserved in peat layers, are one of the key proxies when reconstructing historical peatland dynamics. Northern peatlands can be divided into two main types: fens and bogs. Compared with bog peat, the fen peat is usually more decomposed because of different eco-hydrological conditions and effective humification processes. A high level of decomposition hampers reliable identification of plant remains and constrains palaeoecological approaches. Biogeochemical studies on bog plants and bog peat have shown that plant group–specific biomarkers can be applied to identify fossil plants or plant groups from peat, given the identification of plant group–specific markers in living fen plants. In this study, we applied plant macrofossil, biomarkers and multivariate statistical analyses to two mid-boreal peat sequences to investigate whether biomarkers can be applied to distinguish fen and bog environments and whether plant-specific biomarkers can be identified from fen peat. Macrofossil analyses clearly separate dry bog hummocks, moist lawns and wet fen habitats apart. Corresponding division emerged when the biomarker data were combined with the macrofossil data. Moreover, we succeeded to separate bog and fen habitats apart by the changes in n-alkane and the n-alkane ratio distributions along the cores. The fen–bog transition zone was indicated by high sterol and triterpenoid concentrations and changes in degradation measures. However, it remains a challenging task to attain species-level information of past plant assemblages from highly humified fen peat layers based on biomarkers only.
AnderssonR (2012) Lipid biomarkers and other geochemical indicators in paleoenvironmental studies of two Arctic systems: A Russian permafrost peatland and marine sediments from Lomonosov Ridge. Doctoral Thesis, Stockholm University.
2.
AnderssonRAMeyersPA (2012) Effect of climate change on delivery and degradation of lipid biomarkers in a Holocene peat sequence in the eastern European Russian Arctic. Organic Geochemistry53: 63–72.
3.
AnderssonRAKuhryPMeyersP. (2011) Impacts of paleohydrological changes on n-alkane biomarker compositions of a Holocene peat sequence in the eastern European Russian Arctic. Organic Geochemistry42: 1065–1075.
4.
AvsejsLANottCJXieS. (2002) 5-n-Alkylresorcinols as biomarkers of sedges in an ombrotrophic peat section. Organic Geochemistry33: 861–867.
5.
BaasMPancostRVan GeelB. (2000) A comparative study of lipids in Sphagnum species. Organic Geochemistry31: 535–541.
6.
BarberKDumayne-PeatyLHughesP. (1998) Replicability and variability of the recent macrofossil and proxy-climate record from raised bogs: Field stratigraphy and macrofossil data from Bolton Fell Moss and Walton Moss, Cumbria, England. Journal of Quaternary Science13: 515–528.
7.
BertrandOMansuy-HuaultLMontargès-PelletierE. (2012) Molecular evidence for recent land use change from a swampy environment to a pond (Lorraine, France). Organic Geochemistry50: 1–10.
8.
BinghamEMMcClymontELVälirantaM. (2010) Conservative composition of n-alkane biomarkers in Sphagnum species: Implications for palaeoclimate reconstruction in ombrotrophic peat bogs. Organic Geochemistry41: 214–220.
9.
BushRTMcInerneyFA (2013) Leaf wax n-alkane distributions in and across modern plants: Implications for paleoecology and chemotaxonomy. Geochimica et Cosmochimica Acta117: 161–179.
10.
CorriganDKloosCO’ConnorCS. (1973) Alkanes from four species of Sphagnum moss. Phytochemistry12: 213–214.
11.
DembitskyVM (1993) Lipids of bryophytes. Progress in Lipid Research32: 281–356.
12.
DudováLHájkováPBuchtováH. (2013) Formation, succession and landscape history of Central-European summit raised bogs: A multiproxy study from the Hrubý Jeseník Mountains. The Holocene23: 230–242.
13.
FickenKJBarberKEEglintonG (1998) Lipid biomarker, δ13C and plant macrofossil stratigraphy of a Scottish montane peat bog over the last two millennia. Organic Geochemistry28: 217–237.
14.
FickenKJLiBSwainDL. (2000) An n-alkane proxy for the sedimentary input of submerged/floating freshwater aquatic macrophytes. Organic Geochemistry31: 745–749.
15.
FrolkingSRouletNTTuittilaE-S. (2010) A new model of Holocene peatland net primary production, decomposition, water balance, and peat accumulation. Earth System Dynamics1: 1–21.
16.
GoadLJAkihisaT (1997) Analysis of Sterols. London: Blackie Academic & Professional.
HuangXWangCZhangJ. (2011) Comparison of free lipid compositions between roots and leaves of plants in the Dajiuhu Peatland, Central China. Geochemical Journal45: 365–373.
19.
HughesPDM (2000) A reappraisal of the mechanisms leading to ombrotrophy in British raised mires. Ecology Letters3(1): 7–9.
20.
HughesPDMBarberKE (2003) Mire development across the fen-bog transition on the Teifi floodplain at Tregaron Bog, Ceredigion, Wales, and a comparison with 13 other raised bogs. Journal of Ecology91(2): 253–264.
21.
JiaGDungaitJAJBinghamEM. (2008) Neutral monosaccharides as biomarker proxies for bog-forming plants for application to palaeovegetation reconstruction in ombrotrophic peat deposits. Organic Geochemistry39: 1790–1799.
22.
KillopsSDFrewinNL (1994) Triterpenoid diagenesis and cuticular preservation. Organic Geochemistry21: 1193–1209.
23.
KuhryPVittDH (1996) Fossil carbon/nitrogen ratios as a measure of peat decomposition. Ecology77: 271–275.
24.
LaineAMByrneKAKielyG. (2007) Patterns in vegetation and CO2 dynamics along a water level gradient in a lowland blanket bog. Ecosystems10: 890–905.
25.
LaineAMJuurolaEHajekT. (2011) Sphagnum growth and ecophysiology during mire succession. Oecologia167: 1115–1125.
26.
LarmolaTLeppänenSTuittilaE-S. (2014) Methanotrophy induces nitrogen fixation during peatland development. Proceedings of the National Academy of Sciences of the United States of America111(2): 734–739.
27.
LehtonenKKetolaM (1993) Solvent-extractable lipids of Sphagnum, Carex, Bryales and Carex-Bryales peats: Content and compositional features vs peat humification. Organic Geochemistry20: 363–380.
28.
LeppäläMLaineAMSeväkiviM-L. (2011a) Differences in CO2 dynamics between successional mire plant communities during wet and dry summers. Journal of Vegetation Science22: 357–366.
29.
LeppäläMOksanenJTuittilaE-S (2011b) Methane flux dynamics during mire succession. Oecologia165: 489–499.
30.
LevyPEBurdenACooperMDA. (2012) Methane emissions from soils: Synthesis and analysis of a large UK data set. Global Change Biology18: 1657–1669.
31.
LoiselJYuZ (2013) Recent acceleration of carbon accumulation in a boreal peatland, south central Alaska. Journal of Geophysical Research: Biogeosciences118: 41–53.
32.
López-DíasVBorregoTBlancoCG. (2010) Biomarkers in a peat deposit in Northern Spain (Huelga de Bayas, Asturias) as proxy for climate variation. Journal of Chromatography A1217: 3538–3546.
33.
McClymontELMauquoyDYeloffD. (2008) The disappearance of Sphagnum imbricatum from Butterburn Flow, UK. The Holocene18: 991–1002.
34.
MatthewsE (2000) Wetlands. In: KhalilMAK (ed.) Atmospheric Methane: Its Role in the Global Environment. Berlin: Springer Verlag, pp. 202–233.
35.
MauquoyDVan GeelB (2007) Mire and peat macros. Encyclopedia of Quaternary Science3: 2315–2336.
36.
MauquoyDEngelkesTGrootMHM. (2002a) High-resolution records of late-Holocene climate change and carbon accumulation in two north-west European ombrotrophic peat bogs. Palaeogeography, Palaeoclimatology, Palaeoecology186: 275–310.
37.
MauquoyDVan GeelBBlaauwM. (2002b) Evidence from northwest European bogs shows ‘Little Ice Age’ climatic changes driven by variations in solar activity. The Holocene12: 1–6.
38.
MeyersPA (2003) Applications of organic geochemistry to paleolimnological reconstructions: A summary of examples from the Laurentian Great Lakes. Organic Geochemistry34: 261–289.
39.
MooreTRBubierJLBledzkiL (2007) Litter decomposition in temperate peatland ecosystems: The effect of substrate and site. Ecosystems10: 949–963.
40.
NicholsJEBoothRKJacksonST. (2006) Paleohydrologic reconstruction based on n-alkane distributions in ombrotrophic peat. Organic Geochemistry37: 1505–1513.
41.
NissinenRSewónP (1994) Hydrocarbons of Polytrichum commune. Phytochemistry37: 179–182.
42.
NottCJXieSAvsejsLA. (2000) n-Alkane distributions in ombrotrophic mires as indicators of vegetation change related to climatic variation. Organic Geochemistry31: 231–235.
43.
ØklandRHOklandTRydgrenK (2001) A Scandinavian perspective on ecological gradients in north-west European mires: Reply to Wheeler and Proctor. Journal of Ecology89: 481–486.
44.
OrtizJEDíaz-BautistaAAldasoroJJ. (2011) n-Alkan-2-ones in peat-forming plants from the Roñanzas ombrotrophic bog (Asturias, northern Spain). Organic Geochemistry42: 586–592.
45.
OrtizJEGallegoJLRTorresT. (2010) Palaeoenvironmental reconstruction of Northern Spain during the last 8000 cal yr BP based on the biomarker content of the Roñanzas peat bog (Asturias). Organic Geochemistry41: 454–466.
46.
PancostRDBaasMVan GeelB. (2002) Biomarkers as proxies for plant inputs to peats: An example from a sub-boreal ombrotrophic bog. Organic Geochemistry33: 675–690.
47.
RiuttaTLaineJAurelaM. (2007) Spatial variation in plant community functions regulates carbon gas dynamics in a boreal fen ecosystem. Tellus, Series B: Chemical and Physical Meteorology59: 838–852.
48.
RonkainenTMcClymontELVälirantaM. (2013) The n-alkane and sterol composition of living fen plants as a potential tool for palaeoecological studies. Organic Geochemistry59: 1–9.
49.
RydinHJeglumJKHooijerA (2006) The Biology of Peatlands. Oxford: Oxford University Press.
50.
SachseDRadkeJGleixnerG (2006) δD values of individual n-alkanes from terrestrial plants along a climatic gradient – Implications for the sedimentary biomarker record. Organic Geochemistry37: 469–483.
51.
SalasooI (1987) Epicuticular wax alkanes of some heath plants in central Alaska. Biochemical Systematics and Ecology15: 105–107.
52.
SperanzaAVan Der PlichtJVan GeelB (2000) Improving the time control of the Subboreal/Subatlantic transition in a Czech peat sequence by 14C wiggle-matching. Quaternary Science Reviews19: 1589–1604.
53.
ter BraakCJFPŠmilauerP (2002) CANOCO Reference Manual and CanoDraw for Windows User’s Guide: Software for Canonical Community Ordination (Version 4.5). Ithaca, NY: Microcomputer Power.
54.
TuittilaE-SJuutinenSFrolkingS. (2013) Wetland chronosequence as a model of peatland development: Vegetation succession, peat and carbon accumulation. The Holocene23: 25–35.
55.
TuittilaE-SVälirantaMLaineA. (2007) Quantifying patterns and controls of mire vegetation succession in a southern boreal bog. Journal of Vegetation Science18: 891–902.
56.
TurunenJTomppoETolonenK. (2002) Estimating carbon accumulation rates of undrained mires in Finland: Application to boreal and subarctic regions. The Holocene12: 69–80.
57.
VälirantaMKorholaASeppäH. (2007) High-resolution reconstruction of wetness dynamics in a southern boreal raised bog, Finland, during the late Holocene: A quantitative approach. The Holocene17: 1093–1107.
WheelerBDProctorMCF (2000) Ecological gradients, subdivisions and terminology of north-west European mires. Journal of Ecology88: 187–203.
60.
XieSNottCJAvsejsLA. (2000) Palaeoclimate records in compound-specific δD values of a lipid biomarker in ombrotrophic peat. Organic Geochemistry31: 1053–1057.
61.
XieSNottCJAvsejsLA. (2004) Molecular and isotopic stratigraphy in an ombrotrophic mire for paleoclimate reconstruction. Geochimica et Cosmochimica Acta68: 2849–2862.
62.
YuZLoiselJBrosseauDP. (2010) Global peatland dynamics since the Last Glacial Maximum. Geophysical Research Letters37: L13402.
63.
YuZLoiselJTuretskyMR. (2013) Evidence for elevated emissions from high-latitude wetlands contributing to high atmospheric CH4 concentration in the early Holocene. Global Biogeochemical Cycles27: 131–140.
64.
ZechMAndreevAZechR. (2010) Quaternary vegetation changes derived from a loess-like permafrost palaeosol sequence in northeast Siberia using alkane biomarker and pollen analyses. Boreas39: 540–550.
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