Increase in frequency of the bridled morph of the Common Guillemot Uria aalge on the Isle of May, 1946–2000: a return to former levels?
Bridling in the Common Guillemot Uria aalge is a classic example of a stable ratio‐cline polymorphism. Between 1946 and 2000 the frequency of the bridled morph of the Common Guillemot colony on the Isle of May, south‐east Scotland, increased significantly from 3.5% to 5.9%. Demographic data collecte...
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crwiley:10.1046/j.1474-919x.2003.00118.x 2023-12-03T10:21:14+01:00 Increase in frequency of the bridled morph of the Common Guillemot Uria aalge on the Isle of May, 1946–2000: a return to former levels? Harris, M. P. Rothery, P. Wanless, S. 2002 http://dx.doi.org/10.1046/j.1474-919x.2003.00118.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1474-919X.2003.00118.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1474-919X.2003.00118.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ibis volume 145, issue 1, page 22-29 ISSN 0019-1019 1474-919X Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2002 crwiley https://doi.org/10.1046/j.1474-919x.2003.00118.x 2023-11-09T14:28:56Z Bridling in the Common Guillemot Uria aalge is a classic example of a stable ratio‐cline polymorphism. Between 1946 and 2000 the frequency of the bridled morph of the Common Guillemot colony on the Isle of May, south‐east Scotland, increased significantly from 3.5% to 5.9%. Demographic data collected between 1982 and 2000 indicated that the average breeding success of a pair including at least one bridled bird was 83.8%, significantly greater than 79.5% in unbridled pairs. Over the same period the average overwinter survival was 96.3% for bridled birds and 94.7% for unbridled birds, but the difference was not statistically significant. A population model showed that the increase in frequency of bridling could be accounted for as a return to an equilibrium level close to the 5.04% observed in 1936. Differences in breeding success contributed relatively little to the increase, which could be explained without recourse to differential selection pressure. The latitudinal variation in bridling suggests that bridled morphs are more cold tolerant than unbridled ones. However, the increase in the frequency of bridled birds on the Isle of May was not associated with any decrease in sea or air temperatures over the period. Article in Journal/Newspaper common guillemot Uria aalge uria Wiley Online Library (via Crossref) Ibis 145 1 22 29 |
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Open Polar |
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Wiley Online Library (via Crossref) |
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English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
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Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Harris, M. P. Rothery, P. Wanless, S. Increase in frequency of the bridled morph of the Common Guillemot Uria aalge on the Isle of May, 1946–2000: a return to former levels? |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Bridling in the Common Guillemot Uria aalge is a classic example of a stable ratio‐cline polymorphism. Between 1946 and 2000 the frequency of the bridled morph of the Common Guillemot colony on the Isle of May, south‐east Scotland, increased significantly from 3.5% to 5.9%. Demographic data collected between 1982 and 2000 indicated that the average breeding success of a pair including at least one bridled bird was 83.8%, significantly greater than 79.5% in unbridled pairs. Over the same period the average overwinter survival was 96.3% for bridled birds and 94.7% for unbridled birds, but the difference was not statistically significant. A population model showed that the increase in frequency of bridling could be accounted for as a return to an equilibrium level close to the 5.04% observed in 1936. Differences in breeding success contributed relatively little to the increase, which could be explained without recourse to differential selection pressure. The latitudinal variation in bridling suggests that bridled morphs are more cold tolerant than unbridled ones. However, the increase in the frequency of bridled birds on the Isle of May was not associated with any decrease in sea or air temperatures over the period. |
format |
Article in Journal/Newspaper |
author |
Harris, M. P. Rothery, P. Wanless, S. |
author_facet |
Harris, M. P. Rothery, P. Wanless, S. |
author_sort |
Harris, M. P. |
title |
Increase in frequency of the bridled morph of the Common Guillemot Uria aalge on the Isle of May, 1946–2000: a return to former levels? |
title_short |
Increase in frequency of the bridled morph of the Common Guillemot Uria aalge on the Isle of May, 1946–2000: a return to former levels? |
title_full |
Increase in frequency of the bridled morph of the Common Guillemot Uria aalge on the Isle of May, 1946–2000: a return to former levels? |
title_fullStr |
Increase in frequency of the bridled morph of the Common Guillemot Uria aalge on the Isle of May, 1946–2000: a return to former levels? |
title_full_unstemmed |
Increase in frequency of the bridled morph of the Common Guillemot Uria aalge on the Isle of May, 1946–2000: a return to former levels? |
title_sort |
increase in frequency of the bridled morph of the common guillemot uria aalge on the isle of may, 1946–2000: a return to former levels? |
publisher |
Wiley |
publishDate |
2002 |
url |
http://dx.doi.org/10.1046/j.1474-919x.2003.00118.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1474-919X.2003.00118.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1474-919X.2003.00118.x |
genre |
common guillemot Uria aalge uria |
genre_facet |
common guillemot Uria aalge uria |
op_source |
Ibis volume 145, issue 1, page 22-29 ISSN 0019-1019 1474-919X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1474-919x.2003.00118.x |
container_title |
Ibis |
container_volume |
145 |
container_issue |
1 |
container_start_page |
22 |
op_container_end_page |
29 |
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1784268821006123008 |