Table 1.
Study sites, study periods, and sample size of tagged Larus fuscus
| Colony | Coordinates | Area (km²) | No. of breeding pairs (status) | Study period | Distance to mainland (km) | No. of birds (evaluable data sets) | No. of foraging trips per individual (mean ± SD) |
|---|---|---|---|---|---|---|---|
| AM | 54°41′N, 8°20′E | 20.46 | ca. 10,000a (2012) | 13–31 May 2011 | 24 | 6 | 5.5 ± 5.4 |
| 19 May–4 June 2012 | 7 | 12.4 ± 1.8 | |||||
| BO | 53°43′N, 7°18′E | 30.74 | ca. 1500b (2012) | 20 May–4 June 2012 | 17 | 6 | 13.8 ± 2.3 |
| HE | 54°11′N, 7°53′E | 1.70 | ca. 600c (2013) | 24 May–3 June 2008 | 45 | 4 | 5.8 ± 2.6 |
| 2 May–3 June 2009 | 5 | 6.0 ± 4.1 | |||||
| 18–30 May 2010 | 5 | 5.4 ± 1.5 | |||||
| 17–28 May 2011 | 5 | 12.0 ± 4.3 | |||||
| JU | 53°40′N, 7°04′E | 16.43 | ca. 1000b (2012) | 16 May–4 Jun 2013 | 10 | 11 | 17.4 ± 10.2 |
| NO | 53°43′N, 7°18′E | 26.29 | ca. 4000b (2012) | 16 May–3 June 2013 | 4 | 11 | 8.7 ± 8.6 |
| SP | 53°46′N, 7°42′E | 18.25 | ca. 8000b (2012) | 14–23 May 2009 | 7 | 6 | 5.7 ± 2.0 |
| 16 May–3 June 2010 | 8 | 13.3 ± 3.0 | |||||
| 19 May–5 June 2012 | 7 | 12.0 ± 4.3 |
a
Verein Jordsand e.V. (unpubl. data).
b
Wadden Sea National Park Administration of Lower Saxony (unpubl. data).
c
Island Station of the Institute of Avian Research “Vogelwarte Helgoland” (unpubl. data). Numbers of breeding pairs are overall numbers for the corresponding islands.