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A. Gil-Tena et al. 2010. Disentangling recent changes in forest bird ranges in Mediterranean forests (NE Spain)
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Table 2: Pearson’s and partial correlations, when controlling by the effect of the initial forest area (r forest )
and basal area (G; r G ), between the change in forest bird species richness and forest dynamics, fires and
management. Δ: Change; IMP and REG: improvement and regeneration treatments, respectively; *, **
and ***: p≤0.05, p≤0.01 and p≤0.001, respectively.
Variable
Correlation
Forest r=0.37***, r G =0.16**
G r=0.41***, r forest =0.25***
∆Forest
r=0.22***
∆G r=0.44***, r forest =0.31***, r G =0.25***
Burnt r=0.06, r forest =0.11*, r G =0.12*
IMP Removed G r=0.17**, r forest =0.08, r G =0.06
REG Removed G r=0.27***, r forest =0.13*, r G =0.12*
Table 3: Analysis of the factors behind changes in forest bird species richness between the two atlas
periods. The general linear model was conducted in two steps according to a hierarchical process. The
information in the table concerns to that of each variable in their corresponding step of assessment.
β
p
STEP 1: Initial conditions G 0.297