Table 2. Summary of trend models for Cape Royds, Cape Bird and Cape Crozier (Ross Island) and Beaufort Island colony counts (loge-transformed) with predictor units in years from 1981 to 2012.
| Colony | Best model (1 or 2 linear trends) | Trend 1981–2000 slope estimate (std error estimate) | Trend 2001–2012 slope estimate (std error estimate) |
| Cape Royds | 1 | −0.0085 (0.00797) | |
| Cape Bird | 2 | −0.0245 (0.00862) | 0.0755 (0.01523) |
| Cape Crozier | 2 | −0.0223 (0.00784) | 0.0981 (0.01213) |
| Beaufort Island | 2 | −0.0214 (0.01357) | 0.1028 (0.03318) |
Values in bold text indicate statistical significance of the estimated slope parameter (r = per capita annual growth rates) at P<0.05.