Predation by Ravens Corvus coraxon Brunnich's Guillemot Uria lomviaeggs and chicks and its possible impact on breeding site selection
We studied the behaviour of Ravens Corvus corax taking the eggs or chicks of Brunnich's Guillemots Uria lomvia at East Digges Island, Northwest Territories, Canada. We classified the characteristics of the breeding sites attacked by Ravens according to their location on the cliffs, the width of...
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1996
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Online Access: | http://dx.doi.org/10.1111/j.1474-919x.1996.tb08831.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.1996.tb08831.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.1996.tb08831.x |
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crwiley:10.1111/j.1474-919x.1996.tb08831.x 2024-06-02T08:12:19+00:00 Predation by Ravens Corvus coraxon Brunnich's Guillemot Uria lomviaeggs and chicks and its possible impact on breeding site selection Gaston, Anthony J. Elliot, Richard D. 1996 http://dx.doi.org/10.1111/j.1474-919x.1996.tb08831.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.1996.tb08831.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.1996.tb08831.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ibis volume 138, issue 4, page 742-748 ISSN 0019-1019 1474-919X journal-article 1996 crwiley https://doi.org/10.1111/j.1474-919x.1996.tb08831.x 2024-05-03T10:37:18Z We studied the behaviour of Ravens Corvus corax taking the eggs or chicks of Brunnich's Guillemots Uria lomvia at East Digges Island, Northwest Territories, Canada. We classified the characteristics of the breeding sites attacked by Ravens according to their location on the cliffs, the width of the breeding ledge, the number of adjacent rock faces and the density of nearby breeding guillemots. Ravens selectively attacked peripheral sites near the top of the occupied area, those on narrow ledges and those with few close neighbours. The risk of predation at the most vulnerable sites was more than seven times the average. For the most part, breeding success at 419 sites near the cliff top conformed to predictions based on the observations of Raven predation. However, losses observed over 3 years suggested that more eggs fall accidentally than are taken by avian predators. We concluded that the risks of predation and of accidental dislodgement both contribute to choice of nest sites by Brunnich's Guillemots. The effect of multiple close neighbours in deterring predation by Ravens may be important in determining the density of guillemot breeding sites within the colony. Article in Journal/Newspaper Northwest Territories Uria lomvia uria Wiley Online Library Canada Digges ENVELOPE(-94.130,-94.130,58.540,58.540) Northwest Territories Ibis 138 4 742 748 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
We studied the behaviour of Ravens Corvus corax taking the eggs or chicks of Brunnich's Guillemots Uria lomvia at East Digges Island, Northwest Territories, Canada. We classified the characteristics of the breeding sites attacked by Ravens according to their location on the cliffs, the width of the breeding ledge, the number of adjacent rock faces and the density of nearby breeding guillemots. Ravens selectively attacked peripheral sites near the top of the occupied area, those on narrow ledges and those with few close neighbours. The risk of predation at the most vulnerable sites was more than seven times the average. For the most part, breeding success at 419 sites near the cliff top conformed to predictions based on the observations of Raven predation. However, losses observed over 3 years suggested that more eggs fall accidentally than are taken by avian predators. We concluded that the risks of predation and of accidental dislodgement both contribute to choice of nest sites by Brunnich's Guillemots. The effect of multiple close neighbours in deterring predation by Ravens may be important in determining the density of guillemot breeding sites within the colony. |
format |
Article in Journal/Newspaper |
author |
Gaston, Anthony J. Elliot, Richard D. |
spellingShingle |
Gaston, Anthony J. Elliot, Richard D. Predation by Ravens Corvus coraxon Brunnich's Guillemot Uria lomviaeggs and chicks and its possible impact on breeding site selection |
author_facet |
Gaston, Anthony J. Elliot, Richard D. |
author_sort |
Gaston, Anthony J. |
title |
Predation by Ravens Corvus coraxon Brunnich's Guillemot Uria lomviaeggs and chicks and its possible impact on breeding site selection |
title_short |
Predation by Ravens Corvus coraxon Brunnich's Guillemot Uria lomviaeggs and chicks and its possible impact on breeding site selection |
title_full |
Predation by Ravens Corvus coraxon Brunnich's Guillemot Uria lomviaeggs and chicks and its possible impact on breeding site selection |
title_fullStr |
Predation by Ravens Corvus coraxon Brunnich's Guillemot Uria lomviaeggs and chicks and its possible impact on breeding site selection |
title_full_unstemmed |
Predation by Ravens Corvus coraxon Brunnich's Guillemot Uria lomviaeggs and chicks and its possible impact on breeding site selection |
title_sort |
predation by ravens corvus coraxon brunnich's guillemot uria lomviaeggs and chicks and its possible impact on breeding site selection |
publisher |
Wiley |
publishDate |
1996 |
url |
http://dx.doi.org/10.1111/j.1474-919x.1996.tb08831.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.1996.tb08831.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.1996.tb08831.x |
long_lat |
ENVELOPE(-94.130,-94.130,58.540,58.540) |
geographic |
Canada Digges Northwest Territories |
geographic_facet |
Canada Digges Northwest Territories |
genre |
Northwest Territories Uria lomvia uria |
genre_facet |
Northwest Territories Uria lomvia uria |
op_source |
Ibis volume 138, issue 4, page 742-748 ISSN 0019-1019 1474-919X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1474-919x.1996.tb08831.x |
container_title |
Ibis |
container_volume |
138 |
container_issue |
4 |
container_start_page |
742 |
op_container_end_page |
748 |
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1800758714491207680 |