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Vegetation type Plant species Percentage cover

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Table S4. The mean coverage of plant species (SE) in the control and warmed plots in the light/dark experiment (n=4) on the low arctic Disko Island, mid-July 2013. Vegetation coverage was analyzed using the point-intercept method.

Vegetation type Plant species Percentage cover

Control Warming

Deciduous shrubs

Betula nana 0 8.2 (-)

a

Vaccinium uliginosum 12.2 (4.2) 8.2 (3.1)

Evergreen shrubs

Empetrum nigrum 23.8 (5.5) 8.2 (-)

a

Rhododendron tomentosum 2.0 (-)

a

6.1 (-)

a

Cassiope tetragona, green 12.2 (-)

a

15.3 (6.6) Cassiope tetragona, brown 8.2 (-)

a

7.7 (2.3) Cassiope tetragona, grey 16.3 (6.1) 32.7 (6.3)

Pyrola grandiflora 6.1 (1.2) 5.1 (3.1)

Forbs

Bistorta vivipara 2.0 (0.0) 0

Tofieldia pusilla 2.0 (-)

a

0

Mosses

Mosses 4.1 (2.0) 17.9 (3.4)

Lichens

Cetraria islandica 16.3 (8.3) 8.2 (0.0)

Cetraria nivalis 6.1 (-)

a

18.4 (2.0)

Cladonia rangiferina 2.0 (-)

a

0

Stereocaulon paschale 4.1 (0.0) 2.0 (-)

a

Cetrariella delisei 0 4.1 (-)

a

Litter

Litter 18.4 (6.1) 19.9 (7)

Standing litter 24.5 (9.0) 10.9 (4.8)

Cryptogamic crust

Cryptogamic crust 5.1 (1.0) 5.4 (1.8)

a

(-) the species was found in only one plot.

Figure

Table S4. The mean coverage of plant species (SE) in the control and warmed plots in the light/dark experiment (n=4) on the low arctic Disko  Island, mid-July 2013

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