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Table 1 Biological soil crust taxa (see Additional file 1 ), functional type (McCune and Rosentreter 2007 ), percent cover (mean ± SD), frequency of occurrence (out of 48 quadrats), Indicator Value (IV), and P -value in 1999 and 2010

From: Long-term changes in biological soil crust cover and composition

  

1999

2010

  

Cover

Number

IV, P

Cover

Number

IV, P

Lichens

       

Black crustose thalli lacking apothecia

Crustose

7.2 ± 8.9

48

58, 0.15

5.2 ± 9.6

45

39, 0.86

Cladonia squamules

Squamulose to fruticose

3.8 ± 5.8

47

45, 0.66

4.6 ± 7.0

45

51, 0.36

Trapeliopsis steppica

Squamulose

3.1 ± 6.0

32

46, 0.05

1.4 ± 4.4

23

15, 0.94

Diploschistes muscorum

Crustose

2.2 ± 1.9

46

52, 0.12

1.9 ± 2.0

38

36, 0.89

Trapeliopsis glaucopholis

Squamulose

1.4 ± 4.5

17

13, 0.81

2.4 ± 7.3

19

25, 0.22

White crustose thalli lacking apothecia

Crustose

1.0 ± 1.1

35

61, 0.01

0.2 ± 0.4

9

3, 1

Massalongia carnosa

Lobate

0.9 ± 1.2

30

37, 0.23

0.6 ± 0.5

29

25, 0.80

Leptochidium albociliatum

Lobate

0.9 ± 0.3

44

52, 0.01

0.7 ± 0.5

33

30, 1

Cf. Buellia spp.

Crustose

0.8 ± 1.0

32

27, 0.73

1.2 ± 1.4

27

34, 0.31

Arthonia sp.

Crustose to squamulose

0.6 ± 0.4

8

6, 1

0.5 ± 0.4

16

22, 0.05

Aspicilia spp.

Crustose to fruticose

0.6 ± 0.5

27

15, 0.99

1.6 ± 3.1

35

54, 0.02

Cf. Trapeliopsis bisorediata

Crustose

0.6 ± 0.5

27

13, 1

1.8 ± 4.3

41

65, 0.01

Cf. Lecanora garovaglii

Crustose

0.4 ± 0.8

15

14, 0.81

0.5 ± 1.0

16

19, 0.26

Cf. Rhizocarpon diploschistidina

Lobate

0.4 ± 0.5

17

21, 0.18

0.2 ± 0.4

12

10, 0.93

Psora spp.

Squamulose

0.4 ± 0.5

19

22, 0.42

0.3 ± 0.5

16

15, 0.75

Aspicilia filiformis

Lobate

0.2 ± 0.4

8

5, 0.99

0.4 ± 0.6

16

24, 0.03

Acarospora schleicheri

Crustose

0.2 ± 0.5

29

33, 0.22

0.3 ± 0.5

24

23, 0.88

Brown crustose thalli lacking apothecia

Crustose

0.1 ± 0.2

3

3, 0.62

0.1 ± 0.2

3

3, 0.7

Candelariella citrina

Crustose

0.1 ± 0.3

4

3, 0.85

0.1 ± 0.3

7

9, 0.35

Cladonia fimbriata

Fruticose

0.1 ± 0.3

4

3, 0.96

0.2 ± 0.3

9

13, 0.13

Cf. Endocarpon spp.

Squamulose

0.1 ± 0.3

4

1, 1

0.5 ± 0.5

24

43, 0.01

Fuscopannaria cyanolepra

Crustose

0.1 ± 0.3

4

8, 0.08

0

0

0, 1

Physconia spp.

Lobate to foliose

0.1 ± 0.3

5

5, 0.74

0.1 ± 0.3

6

7, 0.48

Cf. Caloplaca jungermanniae

Crustose

<0.1 ± 0.1

1

1, 0.78

<0.1 ± 0.1

1

1, 0.72

Collema spp.

Crustose

<0.1 ± 0.1

1

1, 0.71

<0.1 ± 0.1

1

1, 0.78

Caloplaca tomenii

Crustose

<0.1 ± 0.2

2

2, 0.81

0.1 ± 0.2

3

4, 0.49

Caloplaca stillicidiorum

Crustose

0

0

0, 1

<0.1 ± 0.1

1

2, 0.57

Cladonia verruculosa

Fruticose

0

0

0, 1

<0.1 ± 0.1

1

2, 0.42

Cf. Lecanora zosterae

Crustose

0

0

0, 1

<0.1 ± 0.2

2

4, 0.28

Texosporium sancti-jacobi

Crustose

0

0

0, 1

<0.01 ± 0.2

2

4, 0.18

Lecidea fuscoatra

Crustose

0

0

0, 1

0.1 ± 0.2

3

6, 0.11

Green crustose thalli lacking apothecia

Crustose

0

0

0, 1

0.1 ± 0.3

4

8, 0.08

Candelaria sp.

Crustose

0

0

0, 1

0.1 ± 0.2

4

8, 0.06

Total lichen cover

 

25 ± 12

  

26 ± 16

  

Bryophytes

       

Small moss

Short moss

34.5 ± 23.2

48

61, 0.02

20.7 ± 20.8

48

38, 1

Cf. Syntrichia spp.

Tall moss

31.3 ± 14.7

47

69, 0.01

9.0 ± 11.1

44

27, 1

Cephaloziella divaricata

liverwort

0.4 ± 0.8

14

15, 0.65

0.3 ± 0.7

16

16, 0.48

Total bryophyte cover

 

56 ± 22

  

30 ± 23

  

Total crust cover

 

82 ± 26

  

56 ± 30

  
  1. Data are organized in order of declining cover by lichens and bryophytes. Significant IV’s are in bold font.