Skip to main content

Table 1 Mean isotopic values of spider (bold) and ground beetle (italics) communities per stand ± standard error

From: Conifers and non-native tree species shift trophic niches of generalist arthropod predators in Central European beech forests

 

Douglas

Beech-Douglas

Beech

Beech-Spruce

Spruce

South

Mean ∆13C

1.97 ± 0.28a

3.28 ± 0.63ab

3.96 ± 0.13 b

3.63 ± 0.5b

2.05 ± 0.19a

 

1.48 ± 0.21a

2.31 ± 0.18b

3.55 ± 0.27c

2.72 ± 0.18b

1.37 ± 0.2a

Minimum ∆13C

0.89 ± 0.35a

2 ± 0.22b

2.95 ± 0.12b

2.09 ± 0.18b

0.62 ± 0.36a

 

0.06 ± 0.48a

1.44 ± 0.23b

2.95 ± 0.3c

1.89 ± 0.35b

− 0.15 ± 0.18a

Maximum ∆13C

3 ± 0.28a

3.88 ± 0.3abc

4.65 ± 0.16c

4.11 ± 0.32bc

3.3 ± 0.25ab

 

2.44 ± 0.22a

3.08 ± 0.23ab

4.29 ± 0.26c

3.48 ± 0.08bc

2.72 ± 0.27ab

Range ∆13C

2.11 ± 0.25a

1.88 ± 0.21a

1.7 ± 0.16a

2.02 ± 0.28a

2.68 ± 0.41a

 

2.37 ± 0.48ab

1.65 ± 0.24a

1.34 ± 0.29a

1.6 ± 0.35a

2.88 ± 0.3b

Mean ∆15N

5.83 ± 0.31a

6.1 ± 0.32ab

6.63 ± 0.23abc

6.77 ± 0.26bc

7.08 ± 0.25c

− 0.9 ± 0.21***

 

4.13 ± 0.21a

5.23 ± 0.3ab

5.81 ± 0.27b

4.8 ± 0.32ab

5.21 ± 0.4ab

Minimum ∆15N

3.78 ± 0.19a

4.25 ± 0.33a

4.66 ± 0.22a

4.41 ± 0.4a

4.85 ± 0.36a

 

2.43 ± 0.47a

4.2 ± 0.3bc

4.65 ± 0.43c

3.09 ± 0.49ab

3.02 ± 0.5ab

Maximum ∆15N

7.74 ± 0.51a

8.33 ± 0.53ab

8.63 ± 0.45ab

8.61 ± 0.32ab

9.36 ± 0.47b

− 1.59 ± 0.32***

 

5.62 ± 0.33a

6.34 ± 0.97a

7.75 ± 0.92a

6.34 ± 0.29a

6.91 ± 0.42a

Range ∆15N

3.97 ± 0.43a

4.07 ± 0.54a

3.98 ± 0.48a

4.2 ± 0.31a

4.57 ± 0.57a

− 1.37 ± 0.37***

 

3.19 ± 0.56a

2.66 ± 0.95a

2.92 ± 1.24a

3.25 ± 0.44a

3.88 ± 0.55a

− 1.76 ± 0.8*

  1. Significant differences are indicated in superscript with letters (stand types) or with asterisks (north-south interactions). Significance letters and p-values were received from Tukey HSD post hoc tests of linear mixed-effects models. The column “South” shows significant difference between the southern and northern plots. *P < 0.05; **P < 0.01; ***P < 0.001