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PLOS ONE | www.plosone.org Table 5. Correlations between climatic covariates.
Pearson Correlation Correlation pattern (Pearson’s r below the diagonal; P value of a t-test for H0: r = 0 above the diagonal)
Climatic covariate Label WNAO PBTan PBRainan PBNAO PC1PB PC2PB BTan Brainan BNAO PC1B PC2B WSR
0.560 0.663 0.855 0.496 0.026
Winter North WNAO 0.919 0.214 0.409 0.293 0.585 0.295 0.793 0.138
0.814 0.968 0.000
Atlantic oscillation 0.691 0.817 0.097
0.955 0.000
(December-February) 0.389 0.765 0.599
0.916 0.400 0.535
Temperature anomaly. PBT 0.023 0.282 0.052 0.000 0.146 0.610 0.328 0.844 0.351 0.426
Pre-Breeding period 0.052 0.330 0.491
(March-April) 0.142 0.832 0.948
0.090 20.004 0.847
Rainfall anomaly. Pre- PBR 20.276 20.240 0.115 0.000 0.483 0.482 0.179 0.889 0.760 0.590
Breeding period (March- 20.363
April)
North Atlantic oscillation. PBNAO 0.185 0.053 20.090 0.073 0.000 0.819 0.529 0.689 0.611
Pre-Breeding period
(March-April)
Integrative climatic PC1PB 0.235 0.736 20.764 1.000 0.956 0.401 0.676 0.715
index 1 Pre-Breeding
period (March-April)
Integrative climatic PC2PB 0.123 20.320 0.158 0.000 0.871 0.803 0.792 0.792
index 2 Pre-Breeding
period (March-April)
6 April 2014 | Volume 9 | Issue 4 | e94526 Temperature anomaly. BT 20.234 0.115 0.158 20.013 0.037 0.989 0.059 0.000
Breeding period (May-
August)
Rainfall anomaly. BR 20.131 20.059 20.009 20.013 0.068 20.189 0.133 0.000 0.986
Breeding period (May-
August) Local and Global Climate Effects on Storm Petrel Demography
North Atlantic oscillation. BNAO 0.098 0.219 20.032 0.188 0.057 0.003 0.000 0.019
Breeding period (May-
August)
Integrative climatic PC1B 0.041 0.045 20.069 0.094 0.060 20.409 0.721 1.000
index 1 Breeding
region (May-August)
Integrative climatic PC2B 20.153 0.209 0.122 0.083 0.060 0.869 0.497 0.000
index 2 Breeding
region (May-August)
West Sicily Rainfall WSR 20.473 20.327 0.719 20.729 20.119 0.140 20.155 20.015 0.044
index
The values of sets of covariates describing climatic conditions in the breeding area during the pre-breeding period and the breeding period, respectively, are in italic. Bold type highlights the covariates retained for the analysis of
climatic effects on survival and recruitment.
doi:10.1371/journal.pone.0094526.t005