Population and colony site dynamics in Black-headed Gulls Larus ridibundus breeding on the Finnish west coast
Population and colony site parameters were examined in an inshore Black-headed Gull population over a period of 7 years. The population varied from 946 to 1445 pairs, but there was no significant difference in colony sizes between years. On average, the colonies contained 79-111 pairs each year. The...
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1993
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fttsvojs:oai:journal.fi:article/133369 2023-09-05T13:24:02+02:00 Population and colony site dynamics in Black-headed Gulls Larus ridibundus breeding on the Finnish west coast Ulfvens, J. 1993-07-01 application/pdf https://ornisfennica.journal.fi/article/view/133369 eng eng BirdLife Finland https://ornisfennica.journal.fi/article/view/133369/81915 https://ornisfennica.journal.fi/article/view/133369 Ornis Fennica; Vol 70 Nro 2 (1993); 96–101 Ornis Fennica; Vol. 70 No. 2 (1993); 96–101 0030-5685 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 1993 fttsvojs 2023-08-23T23:02:42Z Population and colony site parameters were examined in an inshore Black-headed Gull population over a period of 7 years. The population varied from 946 to 1445 pairs, but there was no significant difference in colony sizes between years. On average, the colonies contained 79-111 pairs each year. The gulls occupied a total of 24 breeding islands (26 colonies) in 7 years, which comprises 13% of the total islands in the study area . Each year 71-92% (mean 79%) of the colonies were situated in old sites, and 8- 29% (mean 21 %) in new ones. The most common reason for disappearance of colonies was overgrowth of the nesting islets, caused by manuring of the islands by the gulls. Article in Journal/Newspaper Black-headed Gull Larus ridibundus Federation of Finnish Learned Societies: Scientific Journals Online |
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Open Polar |
collection |
Federation of Finnish Learned Societies: Scientific Journals Online |
op_collection_id |
fttsvojs |
language |
English |
description |
Population and colony site parameters were examined in an inshore Black-headed Gull population over a period of 7 years. The population varied from 946 to 1445 pairs, but there was no significant difference in colony sizes between years. On average, the colonies contained 79-111 pairs each year. The gulls occupied a total of 24 breeding islands (26 colonies) in 7 years, which comprises 13% of the total islands in the study area . Each year 71-92% (mean 79%) of the colonies were situated in old sites, and 8- 29% (mean 21 %) in new ones. The most common reason for disappearance of colonies was overgrowth of the nesting islets, caused by manuring of the islands by the gulls. |
format |
Article in Journal/Newspaper |
author |
Ulfvens, J. |
spellingShingle |
Ulfvens, J. Population and colony site dynamics in Black-headed Gulls Larus ridibundus breeding on the Finnish west coast |
author_facet |
Ulfvens, J. |
author_sort |
Ulfvens, J. |
title |
Population and colony site dynamics in Black-headed Gulls Larus ridibundus breeding on the Finnish west coast |
title_short |
Population and colony site dynamics in Black-headed Gulls Larus ridibundus breeding on the Finnish west coast |
title_full |
Population and colony site dynamics in Black-headed Gulls Larus ridibundus breeding on the Finnish west coast |
title_fullStr |
Population and colony site dynamics in Black-headed Gulls Larus ridibundus breeding on the Finnish west coast |
title_full_unstemmed |
Population and colony site dynamics in Black-headed Gulls Larus ridibundus breeding on the Finnish west coast |
title_sort |
population and colony site dynamics in black-headed gulls larus ridibundus breeding on the finnish west coast |
publisher |
BirdLife Finland |
publishDate |
1993 |
url |
https://ornisfennica.journal.fi/article/view/133369 |
genre |
Black-headed Gull Larus ridibundus |
genre_facet |
Black-headed Gull Larus ridibundus |
op_source |
Ornis Fennica; Vol 70 Nro 2 (1993); 96–101 Ornis Fennica; Vol. 70 No. 2 (1993); 96–101 0030-5685 |
op_relation |
https://ornisfennica.journal.fi/article/view/133369/81915 https://ornisfennica.journal.fi/article/view/133369 |
_version_ |
1776204608257916928 |