Temperature‐related increases in grass growth and greater competition for food drive earlier migrational departure of wintering Whooper Swans
Understanding the departure decisions of migratory birds is critical for determining how changing climatic conditions will influence subsequent arrival times on the breeding grounds. A long‐term dataset (1972–2008) of Whooper Swan Cygnus cygnus departure dates from a wintering site in Ireland was us...
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Online Access: | http://dx.doi.org/10.1111/j.1474-919x.2012.01230.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.2012.01230.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.2012.01230.x |
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crwiley:10.1111/j.1474-919x.2012.01230.x 2024-06-02T08:05:41+00:00 Temperature‐related increases in grass growth and greater competition for food drive earlier migrational departure of wintering Whooper Swans STIRNEMANN, REBECCA L. O’HALLORAN, JOHN RIDGWAY, MARGARET DONNELLY, ALISON 2012 http://dx.doi.org/10.1111/j.1474-919x.2012.01230.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.2012.01230.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.2012.01230.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ibis volume 154, issue 3, page 542-553 ISSN 0019-1019 1474-919X journal-article 2012 crwiley https://doi.org/10.1111/j.1474-919x.2012.01230.x 2024-05-03T11:02:05Z Understanding the departure decisions of migratory birds is critical for determining how changing climatic conditions will influence subsequent arrival times on the breeding grounds. A long‐term dataset (1972–2008) of Whooper Swan Cygnus cygnus departure dates from a wintering site in Ireland was used to assess the factors determining the timing of migration. Early and late migrating swans showed different departure patterns. Earlier wintering ground departure was more pronounced for the first 50% of the population than the last 10% of departing individuals. Earlier departure was associated with an increase in February temperatures at the wintering site for all departure phases except the date when the last individual departed. The date by which the first 50% of Swans had departed was earlier with increasing numbers of wintering Swans, suggesting that competition on the wintering grounds may further influence the timing of departure. The results also suggested that departure is mediated by the influence of spring temperature on food resources, with increased February grass growth in warmer years enabling earlier departure of migrating Swans. To determine why arrival dates in the breeding ground have altered, environmental conditions in the wintering grounds must be taken into account. Article in Journal/Newspaper Cygnus cygnus Whooper Swan Wiley Online Library Ibis 154 3 542 553 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Understanding the departure decisions of migratory birds is critical for determining how changing climatic conditions will influence subsequent arrival times on the breeding grounds. A long‐term dataset (1972–2008) of Whooper Swan Cygnus cygnus departure dates from a wintering site in Ireland was used to assess the factors determining the timing of migration. Early and late migrating swans showed different departure patterns. Earlier wintering ground departure was more pronounced for the first 50% of the population than the last 10% of departing individuals. Earlier departure was associated with an increase in February temperatures at the wintering site for all departure phases except the date when the last individual departed. The date by which the first 50% of Swans had departed was earlier with increasing numbers of wintering Swans, suggesting that competition on the wintering grounds may further influence the timing of departure. The results also suggested that departure is mediated by the influence of spring temperature on food resources, with increased February grass growth in warmer years enabling earlier departure of migrating Swans. To determine why arrival dates in the breeding ground have altered, environmental conditions in the wintering grounds must be taken into account. |
format |
Article in Journal/Newspaper |
author |
STIRNEMANN, REBECCA L. O’HALLORAN, JOHN RIDGWAY, MARGARET DONNELLY, ALISON |
spellingShingle |
STIRNEMANN, REBECCA L. O’HALLORAN, JOHN RIDGWAY, MARGARET DONNELLY, ALISON Temperature‐related increases in grass growth and greater competition for food drive earlier migrational departure of wintering Whooper Swans |
author_facet |
STIRNEMANN, REBECCA L. O’HALLORAN, JOHN RIDGWAY, MARGARET DONNELLY, ALISON |
author_sort |
STIRNEMANN, REBECCA L. |
title |
Temperature‐related increases in grass growth and greater competition for food drive earlier migrational departure of wintering Whooper Swans |
title_short |
Temperature‐related increases in grass growth and greater competition for food drive earlier migrational departure of wintering Whooper Swans |
title_full |
Temperature‐related increases in grass growth and greater competition for food drive earlier migrational departure of wintering Whooper Swans |
title_fullStr |
Temperature‐related increases in grass growth and greater competition for food drive earlier migrational departure of wintering Whooper Swans |
title_full_unstemmed |
Temperature‐related increases in grass growth and greater competition for food drive earlier migrational departure of wintering Whooper Swans |
title_sort |
temperature‐related increases in grass growth and greater competition for food drive earlier migrational departure of wintering whooper swans |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.1111/j.1474-919x.2012.01230.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.2012.01230.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.2012.01230.x |
genre |
Cygnus cygnus Whooper Swan |
genre_facet |
Cygnus cygnus Whooper Swan |
op_source |
Ibis volume 154, issue 3, page 542-553 ISSN 0019-1019 1474-919X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1474-919x.2012.01230.x |
container_title |
Ibis |
container_volume |
154 |
container_issue |
3 |
container_start_page |
542 |
op_container_end_page |
553 |
_version_ |
1800750550825828352 |