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Predation and Anti-Predator Behaviour in a Mixed Colony of Terns Sterna sp. and Black-Headed Gulls Larus ridibundus with Special Reference to the Sandwich Tern Sterna sandvicensis
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Predation and Anti-Predator Behaviour in a Mixed Colony of Terns Sterna sp. and Black-Headed Gulls Larus ridibundus with Special Reference to the Sandwich Tern Sterna sandvicensis

Author: Eduard Fuchs
Edition/Format: Article Article : English
Publication:Ornis Scandinavica (Scandinavian Journal of Ornithology) v8 n1 (19770615): 17-32
Summary:
Predation and anti-predator behaviour were studied on the Stands of Forvie, Scotland, during 1973 and 1974. The main predator on eggs of Sandwich Terns was the Black-headed Gull, on chicks the Herring Gull. In experiments with a stuffed Herring Gull, Sandwich Terns had a much lower attack-frequency than Common and Arctic Terns and Black-headed Gulls. In experiments with laid-out eggs, uncovered eggs were safe from  Read more...
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Document Type: Article
All Authors / Contributors: Eduard Fuchs
ISSN:0030-5693
Language Note: English
Unique Identifier: 5553053683
Awards:

Abstract:

Predation and anti-predator behaviour were studied on the Stands of Forvie, Scotland, during 1973 and 1974. The main predator on eggs of Sandwich Terns was the Black-headed Gull, on chicks the Herring Gull. In experiments with a stuffed Herring Gull, Sandwich Terns had a much lower attack-frequency than Common and Arctic Terns and Black-headed Gulls. In experiments with laid-out eggs, uncovered eggs were safe from predation when among nesting Sandwich Terns, but were heavily preyed upon when laid on the fringe of a subcolony unless they were close to a nest of a Black-headed Gull or another tern species. While the experiments provided evidence of the protection Sandwich Terns obtained by association with other terns, they did not show why Sandwich Terns should prefer nesting in colonies where Black-headed Gulls were present. The latter could be explained by the fact that Black-headed Gulls provided protection about 4 weeks earlier than Common and Arctic Terns.

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Predation and anti-predator behaviour were studied on the Stands of Forvie, Scotland, during 1973 and 1974. The main predator on eggs of Sandwich Terns was the Black-headed Gull, on chicks the Herring Gull. In experiments with a stuffed Herring Gull, Sandwich Terns had a much lower attack-frequency than Common and Arctic Terns and Black-headed Gulls. In experiments with laid-out eggs, uncovered eggs were safe from predation when among nesting Sandwich Terns, but were heavily preyed upon when laid on the fringe of a subcolony unless they were close to a nest of a Black-headed Gull or another tern species. While the experiments provided evidence of the protection Sandwich Terns obtained by association with other terns, they did not show why Sandwich Terns should prefer nesting in colonies where Black-headed Gulls were present. The latter could be explained by the fact that Black-headed Gulls provided protection about 4 weeks earlier than Common and Arctic Terns.

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