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Niche indices calculated for the niche identity test and range-breaking test between western gulls, glaucous-winged gulls and their hybrids.
| Glaucous-winged gulls vs. Hybrid gulls | Western gulls vs. Hybrid gulls | Glaucous-winged gulls vs. Western gulls | |
|---|---|---|---|
| Schoener’s D | 0.248 | 0.315 | 0.146 |
| Warren’s I | 0.520 | 0.570 | 0.309 |
