Skip to main content
. 2024 Sep 4;11(9):240708. doi: 10.1098/rsos.240708

Table 1.

Foraging effort and population size for 21 Northern Gannet Morus bassanus colonies ordered by latitude [12,35,47,48,5364]. Values are given ± s.d. where available. See electronic supplementary material, table S1 for longitude, years of counts and tracking data, sampling frequency, sample size and total distance travelled. *Colonies in the West Atlantic.

colony lat. mean duration (h) mean max. distance (km) no. birds source of tracking data count (AOS/AON) source of colony count
Cape St Mary’s* 46.81 14.3 ± 0.5 72.4 ± 1.9 22 [59] 14 598 [49]
Baccalieu Is* 48.15 9.3 ± 7.3 39.9 ± 24.7 6 [60]a 2253 [52]
Bonaventure* 48.48 28 132 14 [61] 53 635
Rouzic 48.90 25.1 ± 10.9 124.2 ± 50.0 169 [48] 20 400 This study
Alderney 49.71 23.0 122.0 60 [47] 7885 [37]
Funk Is.* 49.75 16.5 102.6 26 [62] 10 047 [52]
Bull Rock 51.58 11.9 ± 8.1 69.8 ± 34.1 14 [12]a 3694 [65]
Grassholm 51.73 21.8 ± 1.7 116.8 ± 7.4 304 [63] 36 011 [66]
Little Skellig 51.78 13.4 ± 11.8 96.5 ± 61.8 9 [12]a 29 683 [65,67]
Great Saltee 52.11 21.5 98.5 71 [12]a; [64]; This study 4722
Lambay 53.50 11.6 ± 7.6 37.5 ± 19.6 3 [12]a 138 JNCC 2010
Bempton 54.15 9.1 45.7 35 [53]; This study 11 061 JNCC 2012
Heligoland 54.18 7.9 ± 8.0 42.0 ± 45.7 3 [54] 656 [66]
Ailsa Craig 55.25 26.2 ± 16.2 152.3 ± 70.5 16 [12]a 33 226
Bass Rock 56.08 25.6 ± 12.6 200.1 ± 98.5 206 [5557]a 60 953 JNCC 2009
St Kilda 57.86 24.3 ± 14.8 164.2 ± 124.1 21 [12]a 60 290 [66]
Sule Skerry 59.08 14.4 ± 5.9 72.9 ± 19.8 2 1870
Vestmann-Aeyjar 63.36 10.2 ± 7.4 43.0 ± 27.0 9 [35] 15 044 [68]
Skrúður 64.90 4.8 ± 4.5 29.2 ± 24.2 27 6051
Store Ulvøyhomen 68.85 6.9 22.3 43 [58] 308 [27]
Storstappen 71.23 6.6 38.7 58 1244
a

Mean values were not available in the published sources, so tracking datasets were provided by the authors.

AON, apparently occupied nests; AOS, apparently occupied sites; JNCC, Joint Nature Conservation Committee Seabird Monitoring Program database (http://jncc.defra.gov.uk/smp/ accessed 14 January 2019).