Table 1 Impact of forest dieback and salvage logging on insect species richness.

From: Climate-induced forest dieback drives compositional changes in insect communities that are more pronounced for rare species

Studied group

Condition

Degree of freedom

Chi-square

P-value (95% confidence)

Significance

Total insects

 

Dieback level effect

2

2.110

0.3483

N.S.

 

Stand type effect

2

0.945

0.6230

N.S.

 

District effect

1

0.520

0.4710

N.S.

Coleoptera

 

Dieback level effect

2

0.357

0.8366

N.S.

 

Stand type effect

2

0.906

0.6357

N.S.

 

District effect

1

13.957

0.0002

***

Diptera

 

Dieback level effect

2

1.978

0.3719

N.S.

 

Stand type effect

2

1.806

0.4053

N.S.

 

District effect

1

1.815

0.1779

N.S.

Hemiptera

 

Dieback level effect

2

0.142

0.9315

N.S.

 

Stand type effect

2

1.640

0.4404

N.S.

 

District effect

1

1.587

0.2078

N.S.

Hymenoptera

 

Dieback level effect

2

2.724

0.2562

N.S.

 

Stand type effect

2

1.239

0.5384

N.S.

 

District effect

1

1.042

0.3074

N.S.

Lepidoptera

 

Dieback level effect

2

0.742

0.6899

N.S.

 

Stand type effect

2

0.150

0.9279

N.S.

 

District effect

1

0.925

0.3361

N.S.

Floricolous

 

Dieback level effect

2

2.330

0.3119

N.S.

 

Stand type effect

2

0.372

0.8301

N.S.

 

District effect

1

0.572

0.4495

N.S.

Non-floricolous

 

Dieback level effect

2

2.100

0.3499

N.S.

 

Stand type effect

2

1.341

0.5114

N.S.

 

District effect

1

0.109

0.7415

N.S.

Parasitoids

 

Dieback level effect

2

2.422

0.2979

N.S.

 

Stand type effect

2

0.798

0.6709

N.S.

 

District effect

1

3.223

0.0073

N.S.

Non-parasitoids

 

Dieback level effect

2

2.018

0.3646

N.S.

 

Stand type effect

2

1.136

0.5666

N.S.

 

District effect

1

<0.001

0.9860

N.S.

  1. Generalized linear models for species richness variations of different study groups (i.e. total insects, five individual insect orders, and four functional groups) compared across respective environmental conditions of diebacks (i.e. low, medium and high forest dieback levels) and stand types (i.e. healthy, disturbed and salvaged logged). Functional groups (i.e. Parasitoids/non-parasitoids, floricolous/non-floricolous insects) were assigned using each MOTU’s taxonomic family. Significance is given by “***” while “N.S.” stands for non-significant.
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