Table 3 The response thresholds of diversity metrics to forest patch size and isolation.

From: Different response of the taxonomic, phylogenetic and functional diversity of birds to forest fragmentation

Response variable

Explanatory variable

Changepoint

Significance level

Species richness of all bird species

Proximity Index (PROX)

570.005

0.185

Forest patch area

6.038

< 0.001***

Percentage of coniferous species

68.835

< 0.001***

Species richness of forest specialists

Proximity Index (PROX)

451.550

0.051‘

Forest patch area

10.426

< 0.001***

Phylogenetic diversity of all bird species

Forest patch area

123.518

0.002**

Functional diversity of forest specialists

Percentage of coniferous species

70.066

< 0.001***

Shape Index (SI) of forest patch

2.474

0.452

  1. Thresholds were calculated only for variables that had statistically significant effect on diversity measures.
  2. Statistically significant effects are emboldened: ***P < 0.001, **P < 0.01, *P < 0.05, ‘P < 0.10.
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