Table 1 Testing the theory of thermal melanism for mushrooms

From: European mushroom assemblages are darker in cold climates

 

Mushroom color lightness

Independent swap

Richness

Frequency

 

F

p

F

p

F

p

F

p

Saprotrophic

        

 Thermal comp. 1

13.28

< 0.001

19.74

< 0.001

13.31

< 0.001

23.10

< 0.001

 Thermal comp. 2

1.88

0.115

1.09

0.426

1.88

0.116

1.37

0.328

 Seasonality

75.54

< 0.001

49.67

< 0.001

76.11

< 0.001

67.53

< 0.001

 Precipitation comp. 1

7.04

< 0.001

7.54

< 0.001

7.02

< 0.001

7.90

< 0.001

 Precipitation comp. 2

3.27

0.071

4.21

0.040

3.13

0.077

4.62

0.031

 Relative forest cover

0.03

0.861

1.13

0.286

0.03

0.869

0.06

0.804

 UV index

0.03

0.993

0.78

0.541

0.03

0.993

0.87

0.352

 Species number

4.27

0.003

0.77

0.406

4.31

0.003

2.67

0.025

 Space

4.14

< 0.001

3.46

< 0.001

4.03

< 0.001

4.22

< 0.001

 Adj. R2

0.48

0.45

0.48

0.50

    

Ectomycorrhizal

        

 Thermal comp. 1

26.90

< 0.001

10.31

< 0.001

25.48

< 0.001

12.93

< 0.001

 Thermal comp. 2

1.02

0.336

0.85

0.561

1.02

0.344

1.38

0.252

 Seasonality

26.60

< 0.001

19.24

< 0.001

26.89

< 0.001

28.10

< 0.001

 Precipitation comp. 1

0.19

0.666

0.05

0.819

0.15

0.696

0.28

0.600

 Precipitation comp. 2

2.15

0.143

0.86

0.354

2.14

0.143

1.82

0.178

 Relative forest cover

0.01

0.927

0.03

0.864

0.00

0.946

0.04

0.838

 UV index

1.78

0.118

1.28

0.260

1.76

0.121

1.22

0.288

 Species number

1.28

0.196

2.19

0.162

1.33

0.199

3.10

0.066

 Space

3.14

< 0.001

1.93

0.014

3.13

< 0.001

2.05

0.006

 Adj. R2

0.28

0.31

0.28

0.32

    
  1. We present effects (F-values) of the mushroom color lightness in response to thermal component 1 (overall temperature means), thermal component 2 (temperature variability), seasonality (month), precipitation component 1 (overall precipitation sums), precipitation component 2 (precipitation variability), relative forest cover and UV index, using log10-transformed species number and space (latitude and longitude) as co-variates. The grid number was further used as a random effect. Effect sizes are presented as F-values (F) and significant effects (p-value < 0.05) are emboldened. The assemblage calculation was based on a presence/absence community matrix of 3054 mushroom-forming fungi (1401 ectomycorrhizal; 1653 saprotrophic species). Further, results based on standardized effect sizes using three null models (independent swap, richness, frequency) are shown. For partial effects plots see Fig. 4 and Supplementary Fig. 5. Source data are provided in Supplementary Data 4
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