Table 3. Availability of terrestrial habitat types and their uses as feeding spots by lesser black-backed gulls tagged in the colony on Spiekeroog from 17 May to 4 June 2010.
| Test | Habitat type | Availability | Feeding spots | Proportional use | Χ2 | p |
|---|---|---|---|---|---|---|
| Open vegetation vs. ground-covering vegetation | Overall | 1292 | 38 | - | 26.00 | <0.001 |
| Ground-covering vegetationa | 1016 | 17 | 0.569 | - | - | |
| No/little vegetationb | 276 | 21 | 2.587 | - | - | |
| Various habitats | Overall | 1292 | 38 | - | 142.27 | <0.001 |
| Grasslanda | 824 | 17 | 0.701 | 5.96 | 0.019 | |
| Potatob | 12 | 6 | 17.000 | 91.20 | <0.001 | |
| Waste disposal | 0 | 1 | - | - | - | |
| Corn | 248 | 12 | 1.645 | 3.76 | 0.062 | |
| Water body | 2 | 0 | - | - | - | |
| Summer wheat | 3 | 0 | - | - | - | |
| Rye | 15 | 0 | 0.000 | 0.45 | 1.000 | |
| Construction area | 6 | 1 | 5.667 | 3.86 | 0.161 | |
| Ploughed soil | 5 | 1 | 6.800 | 4.97 | 0.141 | |
| Winter wheat | 90 | 0 | 0.000 | 2.85 | 0.109 | |
| Fallow land | 6 | 0 | 0.000 | 0.18 | 1.000 | |
| Pea | 2 | 0 | - | - | - | |
| Barley | 61 | 0 | 0.000 | 1.88 | 0.258 | |
| Oat | 8 | 0 | 0.000 | 0.24 | 1.000 | |
| Rape | 10 | 0 | 0.000 | 0.30 | 1.000 |
Proportional use values indicate relative preference (> 1) or avoidance (< 1) of habitats. Significant differences (bold) were tested using Monte Carlo permutation tests (level of significance = 0.05). Tests were only performed for habitat types with an availability >4.
aused less than available on average,
bused more than available on average.