Palaeoclimatic reconstructions of the northern Yukon show cooler conditions before AD 1850 followed by gradual warming, and 20th-century temperature measurements indicate decadal-scale temperature fluctuations. The impact of climate on regional vegetation and lake systems has seldom been observed on this scale, however. With this study, we provide a sub-decadal reconstruction of regional vegetation and lake-basin development for the past 300 years, covering the ‘Little Ice Age’ and the period of recent warming, in low Arctic tundra. We analysed a short lake sediment core from the Yukon Coastal Plain. The age–depth relationship of the core is based on 210Pb/137Cs validated by AMS radiocarbon dating. We analysed terrestrial pollen abundances as proxies for regional vegetation development, and we used grain size and biogeochemical analyses (TOC, TN, TOC/TN, δ13C) and the analysis of semiaquatic pollen to describe the lake development. Stable abundances of regional pollen taxa between AD 1730 and AD 2012 accompanied by climatic warming indicated that the regional vegetation was not sensitive to climate change. Based on changes in TOC/TN, δ13C and pollen of shallow-water taxa, we reconstructed an increase in lake water depth after AD 1910 that likely followed climatic warming. We attributed this development to climate-driven thaw subsidence in the lake basin. The impact of widespread permafrost thaw on regional vegetation needs to be better constrained in order to predict the limits of vegetation stability and drivers of lake changes in the region.
Arctic Monitoring and Assessment Programme (AMAP). (2011) Snow, Water, Ice End Permafrost in the Arctic (SWIPA): Climate Change and the Cryosphere. Oslo: AMAP.
2.
AndersonPMBartleinPJBrubakerLB (1994) Late Quaternary history of tundra vegetation in Northwestern Alaska. Quaternary Research41: 306–315.
3.
ApplebyPGPiliposianGT (2013) Radiometric Dating of the Komakuk Beach and Roland Bay Lake Sediment Cores, Yukon CoastDating Report. Liverpool: University of Liverpool.
4.
BarrosVRFieldBDokkenDJet al. (2014) Climate Change 2014: Impacts, Adaptation, and Vulnerability. Part B: Regional Aspects. Contribution of Working Group II to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge and New York: Cambridge University Press.
5.
BennettKD (1996) Determination of the number of zones in a biostratigraphical sequence. New Phytologist132: 155–170.
6.
BeugH-J (2004) Leitfaden der Pollenbestimmung für Mitteleuropa und angrenzende Gebiete. München: Verlag Dr. Friedrich Pfeil.
7.
BillingsWDPetersonKM (1980) Vegetational change and ice-wedge polygons through the Thaw-Lake Cycle in Arctic Alaska. Arctic and Alpine Research12: 413–432.
8.
BirdBWAbbottMBFinneyBPet al. (2009) A 2000 year varve-based climate record from the central Brooks Range, Alaska. Journal of Paleolimnology41: 25–41.
9.
BirksHHBirksHJB (2000) Future uses of pollen analysis must include plant macrofossils. Journal of Biogeography27: 31–35.
10.
BirksHJBBirksHH (2008) Biological responses to rapid climate change at the Younger Dryas – Holocene transition at Kråkenes, western Norway. The Holocene18: 19–30.
11.
BlissLC (1956) A comparison of plant development in microenvironments of Arctic and Alpine tundras. Ecological Monographs26: 303–337.
12.
BlokDHeijmansMMPDSchaepman-StrubGet al. (2010) Shrub expansion may reduce summer permafrost thaw in Siberian tundra. Global Change Biology16: 1296–1305.
13.
BrownRJE (1966) Influence of vegetation on permafrost. In: WoodsKB (ed.) Permafrost International Conference: Proceedings. Lafayette, IN: National Academy of Sciences, National Research Council, pp. 20–25.
14.
BurnCR (1997) Cryostratigraphy, paleogeography, and climate change during the early Holocene warm interval, western Arctic coast, Canada. Canadian Journal of Earth Sciences34: 912–925.
15.
BurnCRKokeljSV (2009) The environment and permafrost of the Mackenzie Delta area. Permafrost and Periglacial Processes20: 83–105.
16.
BurnCRSmithMW (1990) Development of thermokarst lakes during the Holocene at sites near Mayo, Yukon territory. Permafrost and Periglacial Processes1: 161–175.
17.
BurnCRZhangY (2009) Permafrost and climate change at Herschel Island (Qikiqtaruq), Yukon Territory, Canada. Journal of Geophysical Research: Earth Surface114: F02001.
18.
CAVM Team (2003) Circumpolar Arctic Vegetation Map. Conservation of Arctic Flora and Fauna (CAFF) Map No. 1. Anchorage: U.S. Fish and Wildlife Service.
19.
CodyWJ (2000) Flora of the Yukon Territory. Ottawa: NRC Research Press.
20.
CrayHAPollardWH (2015) Vegetation recovery patterns following permafrost disturbance in a Low Arctic setting: Case study of Herschel Island, Yukon, Canada. Arctic, Antarctic, and Alpine Research47: 99–113.
21.
CwynarLC (1982) A late-Quaternary vegetation history from Hanging Lake, Northern Yukon. Ecological Monographs52: 1–24.
22.
D’ArrigoRWilsonRJacobyG (2006) On the long-term context for late twentieth century warming. Journal of Geophysical Research: Atmospheres111: D03103.
23.
De GrootWJThomasPAWeinRW (1997) Betula Nana L. and Betula Glandulosa Michx. Journal of Ecology85: 241–264.
24.
De KlerkPTheuerkaufMJoostenH (2017) Vegetation, recent pollen deposition, and distribution of some non-pollen palynomorphs in a degrading ice-wedge polygon mire complex near Pokhodsk (NE Siberia), including size-frequency analyses of pollen attributable to Betula. Review of Palaeobotany and Palynology238: 122–143.
25.
De KlerkPTeltewskoiATheuerkaufMet al. (2014) Vegetation patterns, pollen deposition and distribution of non-pollen palynomorphs in an ice-wedge polygon near Kytalyk (NE Siberia), with some remarks on Arctic pollen morphology. Polar Biology37: 1393–1412.
26.
DykeASPrestVK (1987) Late Wisconsinan and Holocene history of the Laurentide Ice Sheet. Geographie Physique et Quaternaire41: 237–263.
27.
EisnerWRPetersonKM (1998) High-resolution pollen analysis of tundra polygons from the North Slope of Alaska. Journal of Geophysical Research: Atmospheres103: 28929–28937.
28.
ElmendorfSCHenryGHRHollisterRDet al. (2012a) Global assessment of experimental climate warming on tundra vegetation: Heterogeneity over space and time. Ecology Letters15: 164–175.
29.
ElmendorfSCHenryGHRHollisterRDet al. (2012b) Plot-scale evidence of tundra vegetation change and links to recent summer warming. Nature Climate Change2: 453–457.
30.
EpsteinHEBeringerJGouldWAet al. (2004) The nature of spatial transitions in the Arctic. Journal of Biogeography31: 1917–1933.
31.
FaegriKIversenJ (1989) Textbook of Pollen Analysis (4th Edition by FaegriKKalandPEKrzywinskiK). New York: John Wiley & Sons.
32.
FortierDAllardMShurY (2007) Observation of rapid drainage system development by thermal erosion of ice wedges on Bylot Island, Canadian Arctic Archipelago. Permafrost and Periglacial Processes18: 229–243.
33.
FraserRLantzTOlthofIet al. (2014) Warming-induced shrub expansion and lichen decline in the Western Canadian Arctic. Ecosystems17: 1151–1168.
34.
FrenchHM (2007) The Periglacial Environment. 3rd Edition.Chichester: John Wiley & Sons.
35.
FritzMHerzschuhUWetterichSet al. (2012a) Late glacial and Holocene sedimentation, vegetation, and climate history from easternmost Beringia (northern Yukon Territory, Canada). Quaternary Research78: 549–560.
36.
FritzMUnkelILenzJet al. (in preparation) Regional environmental change versus local signal preservation in Holocene thermokarst lake sediments: A case study from Herschel Island, Yukon (Canada). Journal of Palaeolimnology.
37.
FritzMWetterichSSchirrmeisterLet al. (2012b) Eastern Beringia and beyond: Late Wisconsinan and Holocene landscape dynamics along the Yukon Coastal Plain, Canada. Palaeogeography, Palaeoclimatology, Palaeoecology319–320: 28–45.
38.
FritzMWolterJRudayaNet al. (2016) Holocene ice-wedge polygon development in northern Yukon permafrost peatlands, Canada. Quaternary Science Reviews147: 279–297.
39.
FrostGVEpsteinHE (2014) Tall shrub and tree expansion in Siberian tundra ecotones since the 1960s. Global Change Biology20: 1264–1277.
40.
FrostGVEpsteinHEWalkerDA (2014) Regional and landscape-scale variability of Landsat-observed vegetation dynamics in northwest Siberian tundra. Environmental Research Letters9: 025004.
41.
GallantALBinnianEFOmernikJMet al. (1995) Ecoregions of Alaska. U.S. Geological Survey Professional Paper 1567. Washington, DC: United States Government Printing Office.
42.
GodinEFortierDCoulombeS (2014) Effects of thermo-erosion gullying on hydrologic flow networks, discharge and soil loss. Environmental Research Letters9: 105010.
43.
GrosseGRomanovskyVJorgensonTet al. (2011) Vulnerability and feedbacks of permafrost to climate change. Eos, Transactions American Geophysical Union92: 73–74.
44.
GüntherFOverduinPPSandakovAVet al. (2013) Short- and long-term thermo-erosion of ice-rich permafrost coasts in the Laptev Sea region. Biogeosciences10: 4297–4318.
45.
HagensteinRSimsMMannGet al. (1999) Arctic coastal tundra. In: RickettsTH (ed.) Terrestrial Ecoregions of North America: A Conservation Assessment. Washington, DC: Island Press, pp. 398–400.
46.
HarrisIJonesPDOsbornTJet al. (2014) Updated high-resolution grids of monthly climatic observations – The CRU TS3.10 Dataset. International Journal of Climatology34: 623–642.
47.
HarryDGFrenchHMPollardWH (1985) Ice wedges and permafrost conditions near King Point, Beaufort Sea Coast, Yukon Territory. Current Research, Part A: Geological Survey of Canada85(1A): 111–116.
48.
HaugenRKBrownJ (1980) Coastal-inland distributions of summer air temperature and precipitation in northern Alaska. Arctic and Alpine Research12: 403–412.
49.
HinkelKMJonesBMEisnerWRet al. (2007) Methods to assess natural and anthropogenic thaw lake drainage on the western Arctic coastal plain of northern Alaska. Journal of Geophysical Research: Earth Surface112: F02S16.
50.
HinzmanLDBettezNDBoltonWRet al. (2005) Evidence and implications of recent climate change in Northern Alaska and other Arctic regions. Climatic Change72: 251–298.
51.
HollingCS (1973) Resilience and stability of ecological systems. Annual Review of Ecology and Systematics4: 1–23.
52.
JolyKJandtRRKleinDR (2009) Decrease of lichens in Arctic ecosystems: The role of wildfire, caribou, reindeer, competition and climate in north-western Alaska. Polar Research28: 433–442.
53.
JorgensonMTOsterkampTE (2005) Response of boreal ecosystems to varying modes of permafrost degradation. Canadian Journal of Forest Research35: 2100–2111.
54.
JorgensonMTShurY (2007) Evolution of lakes and basins in northern Alaska and discussion of the thaw lake cycle. Journal of Geophysical Research: Earth Surface112: F02S17.
KlemmJHerzschuhUPisaricMFJet al. (2013) A pollen-climate transfer function from the tundra and taiga vegetation in Arctic Siberia and its applicability to a Holocene record. Palaeogeography, Palaeoclimatology, Palaeoecology386: 702–713.
57.
KokeljSVJorgensonMT (2013) Advances in thermokarst research. Permafrost and Periglacial Processes24: 108–119.
58.
KokeljSVLewkowiczAG (1998) Long-term influence of active-layer detachment sliding on permafrost slope hydrology, Hot Weather Creek, Ellesmere Island, Canada. In: LewkowiczAGAllardM (eds) Permafrost – Seventh International Conference (Proceedings). Yellowknife: Collection Nordicana, No. 55, pp. 583–589.
59.
KokeljSVLantzTCKaniganJet al. (2009) Origin and polycyclic behaviour of tundra thaw slumps, Mackenzie Delta region, Northwest Territories, Canada. Permafrost and Periglacial Processes20: 173–184.
60.
LamoureuxSFLafrenièreMJ (2009) Fluvial impact of extensive active layer detachments, Cape Bounty, Melville Island, Canada. Arctic, Antarctic, and Alpine Research41: 59–68.
61.
LantuitHPollardWHCoutureNet al. (2012) Modern and late-Holocene retrogressive thaw slump activity on the Yukon Coastal Plain and Herschel Island, Yukon Territory, Canada. Permafrost and Periglacial Processes23: 39–51.
62.
LantzTCGergelSKokeljS (2010) Spatial heterogeneity in the shrub tundra ecotone in the Mackenzie Delta Region, Northwest territories: Implications for Arctic environmental change. Ecosystems13: 194–204.
63.
LantzTCKokeljSVGergelSEet al. (2009) Relative impacts of disturbance and temperature: Persistent changes in microenvironment and vegetation in retrogressive thaw slumps. Global Change Biology15: 1664–1675.
64.
LenzJWetterichSJonesBMet al. (2016) Evidence of multiple thermokarst lake generations from an 11 800-year-old permafrost core on the northern Seward Peninsula, Alaska. Boreas45: 584–603.
65.
LloydAHYoshikawaKFastieCLet al. (2003) Effects of permafrost degradation on woody vegetation at arctic treeline on the Seward Peninsula, Alaska. Permafrost and Periglacial Processes14: 93–101.
66.
LorantyMMGoetzSJ (2012) Shrub expansion and climate feedbacks in Arctic tundra. Environmental Research Letters7: 011005.
67.
McAndrewsJHBertiAANorrisG (1973) Key to the Quaternary Pollen and Spores of the Great Lakes Region. Ontario: Life Sciences Miscellaneous Publications, Royal Ontario Museum.
68.
MacDonaldGMGajewskiK (1992) The northern treeline of Canada. In: JanelleD (ed.) Geographical Snapshots of North America. New York: Guilford Press, pp. 34–37.
69.
MacDonaldGMBeukensRPKieserWEet al. (1987) Comparative radiocarbon dating of terrestrial plant macrofossils and aquatic moss from the ‘ice-free corridor’ of western Canada. Geology15: 837–840.
70.
MacDonaldLATurnerKWBalasubramaniamAMet al. (2012) Tracking hydrological responses of a thermokarst lake in the Old Crow Flats (Yukon Territory, Canada) to recent climate variability using aerial photographs and paleolimnological methods. Hydrological Processes26: 117–129.
71.
MackayJR (1959) Glacier ice-thrust features of the Yukon coast. Geographical Bulletin13: 5–21.
72.
MackayJR (1999) Periglacial features developed on the exposed lake bottoms of seven lakes that drained rapidly after 1950, Tuktoyaktuk Peninsula area, western Arctic coast, Canada. Permafrost and Periglacial Processes10: 39–63.
73.
McKayNPKaufmanDS (2014) An extended Arctic proxy temperature database for the past 2,000 years. Scientific Data1: 140026.
74.
MackoSAEstepMLF (1984) Microbial alteration of stable nitrogen and carbon isotopic compositions of organic matter. Organic Geochemistry6: 787–790.
75.
MeyersPA (1994) Preservation of elemental and isotopic source identification of sedimentary organic matter. Chemical Geology114: 289–302.
76.
MeyersPALallier-VergésE (1999) Lacustrine sedimentary organic matter records of late Quaternary paleoclimates. Journal of Paleolimnology21: 345–372.
77.
MeyersPATerranesJL (2001) Sediment organic matter. In: LastWMSmolJP (eds) Tracking Environmental Change using Lake Sediments. Vol. 2: Physical and Geochemical Methods. Dordrecht: Kluwer Academic Publishers, pp. 239–269.
78.
MurtonJB (2001) Thermokarst sediments and sedimentary structures, Tuktoyaktuk Coastlands, western Arctic Canada. Global and Planetary Change28: 175–192.
79.
Myers-SmithIHElmendorfSCBeckPSAet al. (2015) Climate sensitivity of shrub growth across the tundra biome. Nature Climate Change5: 887–891.
80.
Myers-SmithIHForbesBCWilmkingMet al. (2011a) Shrub expansion in tundra ecosystems: Dynamics, impacts and research priorities. Environmental Research Letters6: 045509.
81.
Myers-SmithIHHikDKennedyCet al. (2011b) Expansion of canopy-forming willows over the twentieth century on Herschel Island, Yukon Territory, Canada. Ambio40: 610–623.
82.
NeilsonRP (1993) Transient ecotone response to climatic change: Some conceptual and modelling approaches. Ecological Applications3: 385–395.
83.
NiemeyerBHerzschuhUPestryakovaL (2015) Vegetation and lake changes on the southern Taymyr peninsula, northern Siberia, during the last 300-years inferred from pollen and Pediastrum green algae records. The Holocene25: 596–606.
84.
NorquayIP (1983) Study of Well Logs in the MacKenzie Delta-Beaufort Sea Area to Outline Permafrost Thickness and/or Gas Hydrate Occurrence. Calgary: D & S Petroleum Consulting Group.
OswaldWWAndersonPMBrownTAet al. (2005) Effects of sample mass and macrofossil type on radiocarbon dating of arctic and boreal lake sediments. The Holocene15: 758–767.
87.
OswaldWWBrubakerLBHuFSet al. (2003) Holocene pollen records from the central Arctic Foothills, northern Alaska: Testing the role of substrate in the response of tundra to climate change. Journal of Ecology91: 1034–1048.
88.
PorterTJPisaricMFJ (2011) Temperature-growth divergence in white spruce forests of Old Crow Flats, Yukon Territory, and adjacent regions of northwestern North America. Global Change Biology17: 3418–3430.
89.
PorterTJPisaricMFJFieldRDet al. (2014) Spring-summer temperatures since AD 1780 reconstructed from stable oxygen isotope ratios in white spruce tree-rings from the Mackenzie Delta, northwestern Canada. Climate Dynamics42: 771–785.
90.
PorterTJPisaricMFJKokeljSVet al. (2009) Climatic Signals in δ13C and δ18O of Tree-rings from White Spruce in the Mackenzie Delta Region, Northern Canada. Arctic, Antarctic, and Alpine Research41: 497–505.
91.
PorterTJPisaricMFJKokeljSVet al. (2013) A ring-width-based reconstruction of June–July minimum temperatures since AD 1245 from white spruce stands in the Mackenzie Delta region, northwestern Canada. Quaternary Research80: 167–179.
92.
PrenticeIC (1985) Pollen representation, source area, and basin size: Toward a unified theory of pollen analysis. Quaternary Research23: 76–86.
93.
R Core Team (2016) A Language and Environment for Statistical Computing. Vienna: R Foundation for Statistical Computing.
94.
RamptonVN (1982) Quaternary Geology of the Yukon Coastal Plain. Québec: Geological Survey of Canada, Bulletin no. 317.
95.
RichardPJH (1970) Atlas pollinique des arbres et de quelques arbustes indigènes du Quebec. Le Naturaliste Canadien97: 1–34, 97–161, 241–306.
96.
RitchieJC (1995) Tansley Review No. 83. Current trends in studies of long-term plant community dynamics. The New Phytologist130: 469–494.
97.
RitchieJCHaddenKAGajewskiK (1987) Modern pollen spectra from lakes in arctic western Canada. Canadian Journal of Botany65: 1605–1613.
98.
RomanovskiiNNHubbertenHWGavrilovAVet al. (2000) Thermokarst and land–ocean interactions, Laptev sea region, Russia. Permafrost and Periglacial Processes11: 137–152.
99.
RowlandJCJonesCEAltmannGet al. (2010) Arctic landscapes in transition: Responses to thawing permafrost. Eos, Transactions American Geophysical Union91: 229–230.
100.
SchefferMCarpenterSFoleyJAet al. (2001) Catastrophic shifts in ecosystems. Nature413: 591–596.
101.
SchleusnerPBiskabornBKKienastFet al. (2015) Basin evolution and palaeoenvironmental variability of the thermokarst lake El’gene-Kyuele, Arctic Siberia. Boreas44: 216–229.
102.
SchuurEGCrummerKVogelJet al. (2007) Plant species composition and productivity following permafrost thaw and thermokarst in Alaskan tundra. Ecosystems10: 280–292.
103.
SimpsonGLOksanenJ (2015) analogue: Analogue matching and modern analogue technique transfer function models (R package version 0.16-0). Available at: http://cran.rproject.org/package=analogue
104.
SmithSLBurgessMM (2002) A Digital Database of Permafrost Thickness in Canada. Open File 4173. Ottawa: Geological Survey of Canada, Terrain Sciences Division.
105.
SmithSLBurgessMMRiseboroughDet al. (2005) Recent trends from Canadian permafrost thermal monitoring network sites. Permafrost and Periglacial Processes16: 19–30.
106.
StevensonFJ (1994) Humus Chemistry: Genesis, Composition, Reactions. New York: John Wiley & Sons.
107.
SturmMRacineCTapeK (2001) Climate change: Increasing shrub abundance in the Arctic. Nature411: 546–547.
108.
ter BraakCJF (1983) Principal components biplots and alpha and beta diversity. Ecology64: 454–462.
109.
TanskiGCoutureNLantuitHet al. (2016) Eroding permafrost coasts release low amounts of dissolved organic carbon (DOC) from ground ice into the nearshore zone of the Arctic Ocean. Global Biogeochemical Cycles30: 1054–1068.
110.
TanskiGLantuitHRuttorSet al. (2017) Transformation of terrestrial organic matter along thermokarst-affected permafrost coasts in the Arctic. Science of the Total Environment581–582: 434–447.
111.
TapeKENSturmMRacineC (2006) The evidence for shrub expansion in Northern Alaska and the Pan-Arctic. Global Change Biology12: 686–702.
112.
TarasovPWilliamsJWAndreevAet al. (2007) Satellite- and pollen-based quantitative woody cover reconstructions for northern Asia: Verification and application to late-Quaternary pollen data. Earth and Planetary Science Letters264: 284–298.
113.
Van EverdingenRO (2005) Multi-Language Glossary of Permafrost and Related Ground-Ice Terms. Boulder, CO: National Snow and Ice Data Center/World Data Center for Glaciology.
114.
ViereckLALittleELJr (1975) Atlas of United States Trees, Vol. 2: Alaska Trees and Common Shrubs. Washington, DC: United States Department of Agriculture, Forest Service.
115.
VirtanenRLuotoMRämäTet al. (2010) Recent vegetation changes at the high-latitude tree line ecotone are controlled by geomorphological disturbance, productivity and diversity. Global Ecology and Biogeography19: 810–821.
116.
WalkerDARaynoldsMKDaniëlsFJet al. (2005) The circumpolar Arctic vegetation map. Journal of Vegetation Science16: 267–282.
117.
WestJJPlugLJ (2008) Time-dependent morphology of thaw lakes and taliks in deep and shallow ground ice. Journal of Geophysical Research: Earth Surface113: F01009.
118.
WolterJLantuitHFritzMet al. (2016) Vegetation composition and shrub extent on the Yukon coast, Canada, are strongly linked to ice-wedge polygon degradation. Polar Research35: 27489.
119.
YoshikawaKHinzmanLD (2003) Shrinking thermokarst ponds and groundwater dynamics in discontinuous permafrost near council, Alaska. Permafrost and Periglacial Processes14: 151–160.
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