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Survival is the percentage of colonies surviving May-March of each year out of the 24 assessed colonies per site.
| Year | Site | Number colonies surviving (Percent total) |
|---|---|---|
| A | 20 (83) | |
| B | 17 (67) | |
| 2010 | C | 19 (79) |
| D | 20 (83) | |
| E | 18 (75) | |
| F | 12 (50) | |
| A | 20 (83) | |
| B | 17 (71) | |
| 2011 | C | 18 (75) |
| D | 18 (75) | |
| E | 18 (75) | |
| F | 12 (50) | |
| A | 21 (88) | |
| B | 19 (79) | |
| 2012 | C | 17 (71) |
| D | 18 (75) | |
| E | 16 (67) | |
| F | 17 (71) |
