Table 1.
Results of two-way ANOVAs analysing the climatic variation in the alpine area of the Sierra de Guadarrama. (Climatic variation has been partitioned into six factors according to the results of the PCA in the electronic supplementary material. The study period spans from 1976 to 2003. Sample units are monthly averages of each study year. Month, seasonal variation attributable to among-months differences; before–after chytridiomycosis (CHM), differences between two time periods according to chytridiomycosis infection (before, lacking the infection—1976 to 1996; after, with the chytridiomycosis outbreak—1997 to 2003; SS, sum of squares; %var., percentage of variance accounted for by each effect. Degrees of freedom are 11, 307 for the month term; 1, 107 for the before–after CHM term; and 11, 307 for the interaction in all ANOVAs.)
| SS | F | p | % var. | |
|---|---|---|---|---|
| PC1—thermal amplitude | ||||
| month | 207.6 | 150.6 | 0.000 | 62.9 |
| before–after CHM | 0.1 | 0.4 | 0.528 | 0.0 |
| interaction | 1.6 | 1.2 | 0.294 | 0.5 |
| PC2—number of hottest sunny days | ||||
| month | 105.6 | 16.5 | 0.000 | 32.0 |
| before–after CHM | 5.0 | 8.7 | 0.004 | 1.5 |
| interaction | 8.7 | 1.4 | 0.189 | 2.6 |
| PC3—precipitation gradient | ||||
| month | 48.8 | 5.3 | 0.000 | 14.8 |
| before–after CHM | 0.5 | 0.6 | 0.440 | 0.2 |
| interaction | 2.3 | 0.2 | 0.994 | 0.7 |
| PC4—storm frequency | ||||
| month | 67.0 | 7.6 | 0.000 | 20.3 |
| before–after CHM | 0.6 | 0.8 | 0.387 | 0.2 |
| interaction | 11.4 | 1.3 | 0.233 | 3.4 |
| PC5—increase in barometric pressure | ||||
| month | 34.3 | 3.6 | 0.000 | 10.4 |
| before–after CHM | 0.4 | 0.5 | 0.470 | 0.1 |
| interaction | 14.6 | 1.5 | 0.115 | 4.4 |
| PC6—mist frequency | ||||
| month | 21.3 | 3.4 | 0.000 | 6.5 |
| before–after CHM | 133.0 | 234.1 | 0.000 | 40.3 |
| interaction | 10.0 | 1.6 | 0.097 | 3.0 |