Table 2.
Selection of correlated environmental metrics, based on minimizing AICc, modeled against δ13C or δ15N of ringed seal claw annuli from 1964 to 2011 in the Beaufort Sea
| Response variable | Sea ice metric | AICc |
|---|---|---|
| δ13C | 50% BREAK | 491.4 |
| 50% FREEZE | 492.7 | |
| OPEN WATER | 493.6 | |
| SUMMER SST | 486.5 | |
| δ15N | 50% BREAK | 597.9 |
| 50% FREEZE | 600.7 | |
| OPEN WATER | 597.0 | |
| SUMMER SST | 595.3 |
Top terms included within environmental model are bolded. 50% BREAK = first day sea ice concentration < 50%, 50% FREEZE = first day sea ice concentration remains > 50%, OPEN WATER = duration between 50% BREAK and 50% FREEZE, SUMMER SST = summer (July–September) sea surface temperature.