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Supplementary Information

SI 1 Conversion of point frequency records to biomass estimates

The relationship between plant biomass and point intercept was estimated for plant groups following Bråthen and Hagberg (2004) for the calculations. Species were assigned to the following groups for the conversion: narrow leaved grasses (for example, Deschampsia flexuosa), broad leaved grasses (for example, Agrostis capillaris), members of the Cyperaceae (for example, Carex spp., Juncaceae), large (for example, Trollius europaeus), medium (for example, Omalotheca norvegica), and small sized forbs (for example, Viola biflora), narrow leaved ericoids (for example, Empetrum nigrum ssp. hermaphroditum), broad leaved ericoids (for example, Vaccinium spp.), and dwarf birch (Betula nana), the last containing Salix spp. as well.



Conversion factors were achieved by weighted linear regression (Bråthen and Hagberg 2004). For this purpose we collected point intercept data using 50 pins in a sampling frame of 42 x 50 cm, and then clipped and weighed dried plant biomass. Slope coefficients (b), standard deviations (SD), coefficients of variation (CV) and number of sampled plots (n) for the weighted linear regressions are given.

Plant group

Abbreviation

b

SD

CV

n

Narrow leaved grasses

Grass N

6.29

0.10706006

0.06534682

25

Broad leaved grasses

Grass B

9.91

0.1360632

0.13929528

19

Cyperaceae

Cyperaceae

11.62

0.09863178

0.11710388

16

Large forbs

Forb L

15.34

0.06746379

0.08563883

14

Medium sized forbs

Forb M

13.52

0.06700414

0.11488253

47

Small forbs

Forb S

6.94

0.06964578

0.00138221

21

Narrow leaved ericoids

Erica N

79.02

0.04019749

0.13951471

21

Broad leaved ericoids

Erica B

35.46

0.0431546

0.07713007

28

Betula nana and Salix spp.

Bet nan

73.53

0.04397358

0.11548998

20

Bråthen KA, Hagberg O (2004) More efficient estimation of plant biomass. Journal of vegetation science 15:653-660

SI 2 Abundances of the species that contributed most to Simpson diversity

Biomass (mean gr m2 ± SD) of the species that contributed most to diversity. Summed biomass of the four species and percentage amount of total biomass these species comprise (in parentheses) is given. Values are given for regions West, Middle, and East and for districts of low and high reindeer densities.



Species

Reindeer density







Low

High

Empetrum nigrum ssp. hermaphroditum










West

40.8 (± 29.5)

61.9 (± 23.5)




Middle

125.0 (± 49.4)

104.0 (± 55.8)




East

70.2 (± 53.0)

102.9 (± 42.3)

Salix herbacea










West

32.5 (± 18.7)

20.0 (± 14.5)




Middle

44.3 (± 28.8)

21.2 (± 11.4)




East

36.0 (± 21.7)

30.0 (± 20.9)

Vaccinium myrtillus










West

32.0 (± 28.8)

17.6 (± 14.7)




Middle

31.3 (± 20.6)

25.1 (± 13.6)




East

32.6 (± 7.8)

59.1 (± 29.9)

Betula nana










West

2.6 (± 6.4)

4.2 (± 9.1)




Middle

9.5 (± 9.8)

3.6 (± 3.4)




East

33.4 (± 50.9)

79.5 (± 40.4)

∑ 4 species










West

108.0 (± 23.1)

(50 %)


103.6 (± 31.2)

(62 %)





Middle

210.2 (± 51.1)

(75 %)


154.0 (± 54.3)

(66 %)





East

172.3 (± 83.9)

(82 %)


271.5 (± 52.7)

(84 %)


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