Main Ref. | Enticott, J. and D. Tipling, 1997 |
---|---|
Remarks | Dipping; surface seizing; shallow plunge diving; coastal; <100 km (Ref. 356). Largely dependent on freshwater and terrestrial environments. Feeds mostly on non-fish vertebrate prey. In the North Sea off the coasts of Scotland and northern England, is known to partially feed on the sandeel, Ammodytes marinus (Ref. 95711). Breeds colonially in a wide variety of habitats including roofs in North America, Europe and northeast Asia (Ref. 84934). One of its observed behavior is to balance between attack and fleeing, these birds redirects their aggression and attack to a substitute object like grass pulling (Ref. 87789). As for coloniality, they visit breeding colonies for a year to select a colony, a potential nesting site, and to obtain a mate to determine if the site is where young are successfully reared (Ref. 84934). |
Marine - Neritic | Marine - Oceanic | Brackishwater | Freshwater | |
---|---|---|---|---|
Marine zones / Brackish and freshwater bodies |
|
|
|
|
Substrate | |
---|---|
Substrate Ref. | |
Special habitats | |
Special habitats Ref. |
Ref. | Enticott, J. and D. Tipling, 1997 |
---|---|
Associations | colony-forming/symphorism; |
Associated with | |
Association remarks | |
Parasitism |
Feeding type | mainly animals (troph. 2.8 and up) |
---|---|
Feeding type Ref. | Daunt, F., S. Wanless, P.R. Simon, H.J. Greenstreet, K.R. Hamer and M.P. Harris, 2008 |
Feeding habit | hunting macrofauna (predator) |
Feeding habit Ref. | Daunt, F., S. Wanless, P.R. Simon, H.J. Greenstreet, K.R. Hamer and M.P. Harris, 2008 |
Estimation method | original sample | unfished population | Remark | ||
---|---|---|---|---|---|
Troph | s.e. | Troph | s.e. | ||
From diet composition | 4.41 | 0.77 | Troph of juv./adults. | ||
From individual food items | 4.17 | 0.72 | Trophic level estimated from a number of food items using a randomized resampling routine. | ||
Ref. | Hamer, K.C., D.R. Thompson, A.J. Rundle, S.A. Lewis and F.M. Stewart, 1994 |