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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
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