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Effects of colony identity (Pacific or Atlantic colony) and type of implant (CORT or control) on loss of at least one offspring in unfed adult kittiwakes. Numbers in parentheses indicate the different effect for individuals that were fed in the Pacific colony.
| lost ≥ 1 | survived | ||
|---|---|---|---|
| Pacific colony | control | 2(1) | 14(14) |
| CORT | 5(1) | 10(14) | |
| Atlantic colony | control | 13 | 5 |
| CORT | 12 | 7 |
