Sturm, M., Racine, C. & Tape, K. Climate change: Increasing shrub abundance in the Arctic. Nature 411, 546 (2001).
Tape, K. D., Sturm, M. & Racine, C. The evidence for shrub expansion in Northern Alaska and the Pan‐Arctic. Global Change Biol. 12, 686–702 (2006).
Forbes, B. C., Fauria, M. M. & Zetterberg, P. Russian Arctic warming and ‘greening’ are closely tracked by tundra shrub willows. Global Change Biol. 16, 1542–1554 (2010).
Frost, G. V. & Epstein, H. E. Tall shrub and tree expansion in Siberian tundra ecotones since the 1960s. Global Change Biol. 20, 1264–1277 (2014).
McManus, kM. et al. Satellite‐based evidence for shrub and graminoid tundra expansion in northern Q uebec from 1986 to 2010. Global Change Biol. 18, 2313–2323 (2012).
Naito, A. T. & Cairns, D. M. Relationships between Arctic shrub dynamics and topographically derived hydrologic characteristics. Environ. Res. Lett. 6, 045506 (2011).
Ropars, P. & Boudreau, S. Shrub expansion at the forest–tundra ecotone: Spatial heterogeneity linked to local topography. Environ. Res. Lett. 7, 015501 (2012).
Tape, K. D., Hallinger, M., Welker, J. M. & Ruess, R. W. Landscape heterogeneity of shrub expansion in Arctic Alaska. Ecosystems 15, 711–724 (2012).
Tape, K. D., Verbyla, D. & Welker, J. M. Twentieth century erosion in Arctic Alaska foothills: The influence of shrubs, runoff, and permafrost. J. Geophys. Res.: Biogeosci. 116, https://doi.org/10.1029/2011JG001795 (2011).
Jorgenson, J. C., Raynolds, M. K., Reynolds, J. H. & Benson, A.-M. Twenty-five year record of changes in plant cover on tundra of northeastern Alaska. Arctic, Antarctic, Alpine Res. 47, 785–806, https://doi.org/10.1657/AAAR0014-097 (2015).
Edlund, S. A. Reconnaissance vegetation studies on western Victoria Island, Canadian Arctic archipelago. in Current Research, Part B, Geological Survey of Canada, Paper 83-1B, 75–81 (Geological Survey of Canada, Ottawa, 1983).
Edlund, S. A. & Egginton, P. A. Morphology and description of an outlier population of tree-sized willows on western Victoria Island, District of Franklin. in Current Research, Part A, Geological Survey of Canada, Paper 84-1A, 279–285 (Geological Survey of Canada, Ottawa, 1984).
Maycock, P. F. & Matthews, B. An Arctic” forest” in the tundra of northern Ungava, Quebec. Arctic 19, 114–144, www.jstor.org/stable/40507312 (1966).
Zalatan, R. & Gajewski, K. Dendrochronological potential of Salix alaxensis from the Kuujjua River area, western Canadian Arctic. Tree-Ring Res. 62, 75–82 (2006).
Polunin, N. The birch ‘forests’ of Greenland. Nature 140, 939–940 (1937).
Polunin, N. Conduction through roots in frozen soil. Nature 132, 313–314 (1933).
Biskaborn, B. K. et al. Permafrost is warming at a global scale. Nat. Commun. 10, 264 (2019).
Jorgenson, M. T., Shur, Y. L. & Pullman, E. R. Abrupt increase in permafrost degradation in Arctic Alaska. Geophy. Res. Lett. 33, https://doi.org/10.1029/2005GL024960 (2006).
Liljedahl, A. K. et al. Pan-Arctic ice-wedge degradation in warming permafrost and its influence on tundra hydrology. Nat. Geosci. 9, 312 (2016).
Stephani, E., Drage, J., Miller, D., Jones, B. M. & Kanevskiy, M. Taliks, cryopegs, and permafrost dynamics related to channel migration, Colville River Delta, Alaska. Permaf. Periglac. Processes 31, 239–254, https://doi.org/10.1002/ppp.2046 (2020).
Smith, L. C., Pavelsky, T. M., MacDonald, G. M., Shiklomanov, A. I. & Lammers, R. B. Rising minimum daily flows in northern Eurasian rivers: A growing influence of groundwater in the high‐latitude hydrologic cycle. J. Geophys. Res.: Biogeosci. 112, https://doi.org/10.1029/2006JG000327 (2007).
St. Jacques, J. M. & Sauchyn, D. J. Increasing winter baseflow and mean annual streamflow from possible permafrost thawing in the Northwest Territories, Canada. Geophys. Res. Lett. 36, https://doi.org/10.1029/2008GL035822 (2009).
Harms, T. K., Abbott, B. W. & Jones, J. B. Thermo-erosion gullies increase nitrogen available for hydrologic export. Biogeochemistry 117, 299–311, https://doi.org/10.1007/s10533-013-9862-0 (2014).
McClelland, J. W., Stieglitz, M., Pan, F., Holmes, R. M. & Peterson, B. J. Recent changes in nitrate and dissolved organic carbon export from the upper Kuparuk River, North Slope, Alaska. J. Geophys. Res.: Biogeosci. 112, https://doi.org/10.1029/2006JG000371 (2007).
Elmendorf, S. C. et al. Plot-scale evidence of tundra vegetation change and links to recent summer warming. Nat. Clim. Change 2, 453 (2012).
Myers-Smith, I. H. et al. Climate sensitivity of shrub growth across the tundra biome. Nat. Clim. Change 5, 887 (2015).
Ackerman, D. E. et al. Uniform shrub growth response to June temperature across the North Slope of Alaska. Environ. Res. Lett. 13, 044013, https://doi.org/10.1088/1748-9326/aab326 (2018).
Lantz, T. C., Gergel, S. E. & Henry, G. H. Response of green alder (Alnus viridis subsp. fruticosa) patch dynamics and plant community composition to fire and regional temperature in north‐western Canada. J. Biogeogr. 37, 1597–1610 (2010).
Raynolds, M. K., Walker, D. A., Verbyla, D. & Munger, C. A. Patterns of change within a tundra landscape: 22-year Landsat NDVI trends in an area of the northern foothills of the Brooks Range, Alaska. Arct., Antarct., Alp. Res. 45, 249–260 (2013).
Frost, G. V., Epstein, H. E., Walker, D. A., Matyshak, G. & Ermokhina, K. Patterned-ground facilitates shrub expansion in Low Arctic tundra. Environ. Res. Lett. 8, 015035 (2013).
Jones, B. M. et al. Identification of unrecognized tundra fire events on the north slope of Alaska. J. Geophys. Res.: Biogeosci. 118, 1334–1344 (2013).
Lantz, T. C., Kokelj, S. V., Gergel, S. E. & Henry, G. H. Relative impacts of disturbance and temperature: persistent changes in microenvironment and vegetation in retrogressive thaw slumps. Global Change Biol. 15, 1664–1675 (2009).
Tape, K. D., Christie, K., Carroll, G. & O’Donnell, J. A. Novel wildlife in the Arctic: the influence of changing riparian ecosystems and shrub habitat expansion on snowshoe hares. Global Change Biol. 22, 208–219 (2016).
Jorgenson, M. T. & Osterkamp, T. E. Response of boreal ecosystems to varying modes of permafrost degradation. Canadian J. For. Res. 35, 2100–2111 (2005).
Schuur, E. A., Crummer, K. G., Vogel, J. G. & Mack, M. C. Plant species composition and productivity following permafrost thaw and thermokarst in Alaskan tundra. Ecosystems 10, 280–292 (2007).
Swanson, D. K. Environmental limits of tall shrubs in Alaska’s Arctic National Parks. PLoS ONE 10, e0138387 (2015).
Sturm, M., Douglas, T., Racine, C. & Liston, G. E. Changing snow and shrub conditions affect albedo with global implications. J.Geophys. Res.: Biogeosci. 110, https://doi.org/10.1029/2005JG000013 (2005).
Buckeridge, K. M., Zufelt, E., Chu, H. & Grogan, P. Soil nitrogen cycling rates in low arctic shrub tundra are enhanced by litter feedbacks. Plant and Soil 330, 407–421 (2010).
Lawrence, D. M. & Swenson, S. C. Permafrost response to increasing Arctic shrub abundance depends on the relative influence of shrubs on local soil cooling versus large-scale climate warming. Environ. Res. Lett. 6, 045504 (2011).
Weintraub, M. N. & Schimel, J. P. Nitrogen cycling and the spread of shrubs control changes in the carbon balance of Arctic tundra ecosystems. Bioscience 55, 408–415 (2005).
Chapin, F. S. et al. Role of land-surface changes in Arctic summer warming. Science 310, 657–660 (2005).
Beringer, J., Chapin, F. S. III, Thompson, C. C. & McGuire, A. D. Surface energy exchanges along a tundra-forest transition and feedbacks to climate. Agricu. For. Meteorol. 131, 143–161 (2005).
Myers‐Smith, I. H. & Hik, D. S. Shrub canopies influence soil temperatures but not nutrient dynamics: an experimental test of tundra snow–shrub interactions. Ecol. Evol. 3, 3683–3700 (2013).
Frost, G. V., Epstein, H. E., Walker, D. A., Matyshak, G. & Ermokhina, K. Seasonal and long-term changes to active-layer temperatures after tall shrubland expansion and succession in Arctic tundra. Ecosystems 21, 507–520 (2018).
Liston, G. E., Mcfadden, J. P., Sturm, M. & Pielke, R. A. Modelled changes in arctic tundra snow, energy and moisture fluxes due to increased shrubs. Global Change Biol. 8, 17–32 (2002).
Jafarov, E. E. et al. Modeling the role of preferential snow accumulation in through talik development and hillslope groundwater flow in a transitional permafrost landscape. Environ. Res. Lett. 13, 105006 (2018).
Deslippe, J. R., Hartmann, M., Simard, S. W. & Mohn, W. W. Long-term warming alters the composition of Arctic soil microbial communities. FEMS Microbiol. Ecol. 82, 303–315 (2012).
Geml, J., Semenova, T. A., Morgado, L. N. & Welker, J. M. Changes in composition and abundance of functional groups of arctic fungi in response to long-term summer warming. Biol. Lett. 12, 20160503 (2016).
Koyama, A., Wallenstein, M. D., Simpson, R. T. & Moore, J. C. Soil bacterial community composition altered by increased nutrient availability in Arctic tundra soils. Front. Microbiol. 5, 516 (2014).
Mackelprang, R. et al. Metagenomic analysis of a permafrost microbial community reveals a rapid response to thaw. Nature 480, 368–371 (2011).
Xue, K. et al. Tundra soil carbon is vulnerable to rapid microbial decomposition under climate warming. Nat. Clim. Change 6, 595 (2016).
Yang, Z. et al. Microbial community and functional gene changes in Arctic tundra soils in a microcosm warming experiment. Front. Microbiol. 8, 1741 (2017).
Yuan, M. M. et al. Microbial functional diversity covaries with permafrost thaw-induced environmental heterogeneity in tundra soil. Global Change Biol. 24, 297–307 (2017).
Bever, J. D., Platt, T. G. & Morton, E. R. Microbial population and community dynamics on plant roots and their feedbacks on plant communities. Ann. Rev. Microbiol. 66, 265–283 (2012).
Van Der Heijden, M. G., Bardgett, R. D. & Van Straalen, N. M. The unseen majority: soil microbes as drivers of plant diversity and productivity in terrestrial ecosystems. Ecol. Lett. 11, 296–310 (2008).
Shi, Y. et al. Vegetation-associated impacts on arctic tundra bacterial and microeukaryotic communities. Appl. Environ. Microbiol. 81, 492–501 (2015).
Wallenstein, M. D., McMahon, S. & Schimel, J. Bacterial and fungal community structure in Arctic tundra tussock and shrub soils. FEMS Microbiol. Ecol. 59, 428–435 (2007).
Chu, H., Neufeld, J. D., Walker, V. K. & Grogan, P. The influence of vegetation type on the dominant soil bacteria, archaea, and fungi in a low Arctic tundra landscape. Soil Sci. Soc. Am. J. 75, 1756–1765 (2011).
Lipson, D. A. et al. Changes in microbial communities along redox gradients in polygonized Arctic wet tundra soils. Environ. Microbiol. Rep. 7, 649–657 (2015).
Schickhoff, U., Walker, M. D. & Walker, D. A. Riparian willow communities on the Arctic Slope of Alaska and their environmental relationships: a classification and ordination analysis. Phytocoenologia 32, 145–204 (2002).
Chu, H. et al. Soil bacterial diversity in the Arctic is not fundamentally different from that found in other biomes. Environ. Microbiol. 12, 2998–3006 (2010).
Walker, D. A. et al. Vegetation of zonal patterned-ground ecosystems along the North America Arctic bioclimate gradient. Appl. Vegetation Sci. 14, 440–463 (2011).
Fujimura, K. E. & Egger, K. N. Host plant and environment influence community assembly of High Arctic root-associated fungal communities. Fungal Ecol. 5, 409–418 (2012).
Timling, I., Walker, D. A., Nusbaum, C., Lennon, N. J. & Taylor, D. L. Rich and cold: diversity, distribution and drivers of fungal communities in patterned-ground ecosystems of the North American Arctic. Mol. Ecol. 23, 3258–3272 (2014).
Schütte, U. M. E. et al. Effect of permafrost thaw on plant and soil fungal community in a boreal forest: Does fungal community change mediate plant productivity response? J. Ecol. 107, 1737–1752 (2019).
Natali, S. M., Schuur, E. A. G. & Rubin, R. L. Increased plant productivity in Alaskan tundra as a result of experimental warming of soil and permafrost. J. Ecol. 100, 488–498 (2011).
Johnston, E. R. et al. Responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths. Proc. Natl Acad. Sci. USA 116, 15096–15105, https://doi.org/10.1073/pnas.1901307116 (2019).
Drake, T. W. et al. Increasing alkalinity export from large Russian arctic rivers. Environ. Sci. Technol. 52, 8302–8308 (2018).
Peterson, B. J. et al. Increasing river discharge to the Arctic. Ocean. Sci. 298, 2171–2173 (2002).
Hamilton, T. D. Surficial Geology of the Dalton Highway (Itkillik-Sagavanirktok rivers) Area, Southern Arctic foothills, Alaska. (State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, 2003).
Hamilton, T. D. Glacial Geology of the Toolik Lake and Upper Kuparuk River Regions. Report No. 0568-8604, 30 (Institute of Arctic Biology, University of Alaska, Fairbank, AK, 2003).
Osterkamp, T. & Payne, M. Estimates of permafrost thickness from well logs in northern Alaska. Cold Regions Sci. Technol. 5, 13–27 (1981).
Kane, D. L. et al. Hydrology and Meteorology of the Central Alaskan Arctic: Data Collection and Analysis. Final Report 169 (Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK, 2014).
Pavelsky, T. M. & Zarnetske, J. P. Rapid decline in river icings detected in Arctic Alaska: implications for a changing hydrologic cycle and river ecosystems. Geophys. Res. Lett. 44, 3228–3235 (2017).
Walker, D. A. et al. The circumpolar Arctic vegetation map. J. Vegetation Sci. 16, 267–282 (2005).
Minsley, BurkeJ. et al. Airborne electromagnetic imaging of discontinuous permafrost. Geophys. Res. Lett. 39, 2 (2012).
Minsley, BurkeJ. et al. Sensitivity of airborne geophysical data to sublacustrine and near-surface permafrost thaw. Cryosphere 9, 2 (2015).
Kreig, R. A. & Reger, R. D. Air-Photo Analysis and Summary of Landform Soil Properties Along the Route of the Trans-Alaska Pipeline System. Vol. 149 (Division of Geological & Geophysical Surveys, 1982).
Williams, J. R. Engineering-geologic Maps of Northern Alaska, Wainwright Quadrangle. Vol. 28 (US Geological Survey, Menlo Park, CA, 1983).
Rawlinson, S. E. Surficial Geology and Morphology of the Alaskan Central Arctic Coastal Plain. Vol. 172 (Alaska Division of Geology and Geophysical Survey, Fairbanks, AK, 1990).
Frost, G. V. Vegetation, soils, and environmental data in Arctic Riparian Shrublands, North Slope Alaska, 2016. Arctic Data Center, https://doi.org/10.18739/A2G15TB43 (2017).
Timling, I. Riparian Shrub expansion: soil analysis data, microbial communities and microarray gene data from the North Slope of Alaska, 2016. Arctic Data Center, https://doi.org/10.18739/A2GB1XH26 (2017).
Liljedahl, A. K. Synoptic stream discharge August 2016, Dalton Highway, Alaska. Arctic Data Center, https://doi.org/10.18739/A2WD3Q190 (2017).
Daanen, R. P. Elevation and permafrost active layer observations near two creeks in the foothills of the Brooks Range, Alaska, May 2017. Arctic Data Center, https://doi.org/10.18739/A2H708100 (2017).
Daanen, R. P. Ground resistivity near two creeks in the foothills of the Brooks Range, Alaska, May 2017. Arctic Data Center, https://doi.org/10.18739/A2CF9J66P (2017).
Brown, J., Ferrians, O. J. J., Heginbottom, J. & Melnikov, E. Circum-Arctic Map of Permafrost and Ground-Ice Conditions Version 2 [Permafrost] (National Snow and Ice Data Center), http://nsidc.org/data/GGD318 (2002).
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