Ecology and Colonial Structure of Large Gulls in an Urban Colony: Investigations and Management at Dumfries, SW Scotland
| Autor: | B. A. Coulson, J. C. Coulson |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Waterbirds. 32:1-15 |
| ISSN: | 1938-5390 1524-4695 |
| DOI: | 10.1675/063.032.0101 |
| Popis: | This study made at Dumfries, SW Scotland, has revealed new information on the ecology and social structure of an urban colony of Lesser Black-backed and Herring Gulls Larus fuscus and L. argentatus. There has been a decline in the numbers of gulls nesting in Dumfries, contrary to a national trend of increasing numbers. These gulls nested socially and almost invariably had another pair within 100 m. Recruitment was almost totally confined to existing groups and new breeding areas were initiated by forming roosting groups on suitable sites. High-density groups were formed on flat roofs, usually on industrial and commercial properties, while low densities pairs occurred in residential areas and these pairs usually nested on chimneystacks. From 2000 to 2007, the public subjected nesting gulls to appreciable and increasing non-lethal disruption, mainly by nest and egg removal. This halved the overall breeding success and resulted in increased movement of nesting sites between years. However at sites ... |
| Databáze: | OpenAIRE |
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