Do Red Knots ( Calidris canutus islandica ) routinely skip Iceland during southward migration?
Subspecies Calidris canutus islandica of the Red Knot breeds on the arctic tundra of northeastern Canada and northern Greenland and winters along the coasts of northwestern Europe. During northward migration, it stops over in either Iceland or northern Norway. It has been assumed that it does the sa...
Published in: | The Condor |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2010
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Online Access: | https://hdl.handle.net/11370/1eaec64f-4302-40b7-8aaf-8ce09711bb9d https://research.rug.nl/en/publications/1eaec64f-4302-40b7-8aaf-8ce09711bb9d https://doi.org/10.1525/cond.2010.090139 https://pure.rug.nl/ws/files/6744201/2010CondorDietz.pdf |
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ftunigroningenpu:oai:pure.rug.nl:publications/1eaec64f-4302-40b7-8aaf-8ce09711bb9d 2024-09-09T19:27:16+00:00 Do Red Knots ( Calidris canutus islandica ) routinely skip Iceland during southward migration? Dietz, Maurine W. Spaans, Bernard Dekinga, Anne Klaassen, Marcel Korthals, Harry van Leeuwen, Casper Piersma, Theunis 2010-02 application/pdf https://hdl.handle.net/11370/1eaec64f-4302-40b7-8aaf-8ce09711bb9d https://research.rug.nl/en/publications/1eaec64f-4302-40b7-8aaf-8ce09711bb9d https://doi.org/10.1525/cond.2010.090139 https://pure.rug.nl/ws/files/6744201/2010CondorDietz.pdf eng eng https://research.rug.nl/en/publications/1eaec64f-4302-40b7-8aaf-8ce09711bb9d info:eu-repo/semantics/openAccess Dietz , M W , Spaans , B , Dekinga , A , Klaassen , M , Korthals , H , van Leeuwen , C & Piersma , T 2010 , ' Do Red Knots ( Calidris canutus islandica ) routinely skip Iceland during southward migration? ' , Condor , vol. 112 , no. 1 , pp. 48-55 . https://doi.org/10.1525/cond.2010.090139 age effect stable carbon isotope migration sex shorebird stopover ecology Red Knot Calidris canutus WADDEN SEA LABORATORY EXPERIMENTS SEASONAL-VARIATION BREEDING GROUNDS BODY STORES SHOREBIRDS WADERS STOPOVER CHOICE SHORES article 2010 ftunigroningenpu https://doi.org/10.1525/cond.2010.090139 2024-06-17T15:54:38Z Subspecies Calidris canutus islandica of the Red Knot breeds on the arctic tundra of northeastern Canada and northern Greenland and winters along the coasts of northwestern Europe. During northward migration, it stops over in either Iceland or northern Norway. It has been assumed that it does the same during southward migration. Using ratios of stable carbon isotopes (delta(13)C) in whole blood, blood cells, and plasma, we investigated evidence for a stopover in Iceland en route from the breeding grounds to the Dutch Wadden Sea. With the expected diet (shellfish) and stopover duration at Iceland (12-15 days, maximum 17 days) and the turnover rates of blood cells (15.1 days) and plasma (6.0 days), Red Knots that stopped in Iceland should arrive with a blood (cell) delta(13)C midway between a tundra (-24.7 parts per thousand) and a marine value (-14.0 parts per thousand) and a plasma delta(13)C approaching the marine value (-15.3 parts per thousand). However, many adults arriving at the Wadden Sea had delta(13)C ratios in blood (cells) and plasma below these levels, and some arrived with clear tundra signals in blood cells, suggesting that they skipped Iceland during southward migration. Surprisingly, available data suggest this also to be true for juveniles during their first southward migration. The delta(13)C signature of second-year birds confirmed that they oversummered in the Wadden Sea. Our findings contradict the largely untested idea that juvenile shorebirds make more stopovers than adults as well as the idea that the migration between the Nearctic and Europe is necessarily a two-leg process. Article in Journal/Newspaper Arctic Calidris canutus Greenland Iceland Northern Norway Red Knot Tundra University of Groningen research database Arctic Canada Greenland Norway The Condor 112 1 48 55 |
institution |
Open Polar |
collection |
University of Groningen research database |
op_collection_id |
ftunigroningenpu |
language |
English |
topic |
age effect stable carbon isotope migration sex shorebird stopover ecology Red Knot Calidris canutus WADDEN SEA LABORATORY EXPERIMENTS SEASONAL-VARIATION BREEDING GROUNDS BODY STORES SHOREBIRDS WADERS STOPOVER CHOICE SHORES |
spellingShingle |
age effect stable carbon isotope migration sex shorebird stopover ecology Red Knot Calidris canutus WADDEN SEA LABORATORY EXPERIMENTS SEASONAL-VARIATION BREEDING GROUNDS BODY STORES SHOREBIRDS WADERS STOPOVER CHOICE SHORES Dietz, Maurine W. Spaans, Bernard Dekinga, Anne Klaassen, Marcel Korthals, Harry van Leeuwen, Casper Piersma, Theunis Do Red Knots ( Calidris canutus islandica ) routinely skip Iceland during southward migration? |
topic_facet |
age effect stable carbon isotope migration sex shorebird stopover ecology Red Knot Calidris canutus WADDEN SEA LABORATORY EXPERIMENTS SEASONAL-VARIATION BREEDING GROUNDS BODY STORES SHOREBIRDS WADERS STOPOVER CHOICE SHORES |
description |
Subspecies Calidris canutus islandica of the Red Knot breeds on the arctic tundra of northeastern Canada and northern Greenland and winters along the coasts of northwestern Europe. During northward migration, it stops over in either Iceland or northern Norway. It has been assumed that it does the same during southward migration. Using ratios of stable carbon isotopes (delta(13)C) in whole blood, blood cells, and plasma, we investigated evidence for a stopover in Iceland en route from the breeding grounds to the Dutch Wadden Sea. With the expected diet (shellfish) and stopover duration at Iceland (12-15 days, maximum 17 days) and the turnover rates of blood cells (15.1 days) and plasma (6.0 days), Red Knots that stopped in Iceland should arrive with a blood (cell) delta(13)C midway between a tundra (-24.7 parts per thousand) and a marine value (-14.0 parts per thousand) and a plasma delta(13)C approaching the marine value (-15.3 parts per thousand). However, many adults arriving at the Wadden Sea had delta(13)C ratios in blood (cells) and plasma below these levels, and some arrived with clear tundra signals in blood cells, suggesting that they skipped Iceland during southward migration. Surprisingly, available data suggest this also to be true for juveniles during their first southward migration. The delta(13)C signature of second-year birds confirmed that they oversummered in the Wadden Sea. Our findings contradict the largely untested idea that juvenile shorebirds make more stopovers than adults as well as the idea that the migration between the Nearctic and Europe is necessarily a two-leg process. |
format |
Article in Journal/Newspaper |
author |
Dietz, Maurine W. Spaans, Bernard Dekinga, Anne Klaassen, Marcel Korthals, Harry van Leeuwen, Casper Piersma, Theunis |
author_facet |
Dietz, Maurine W. Spaans, Bernard Dekinga, Anne Klaassen, Marcel Korthals, Harry van Leeuwen, Casper Piersma, Theunis |
author_sort |
Dietz, Maurine W. |
title |
Do Red Knots ( Calidris canutus islandica ) routinely skip Iceland during southward migration? |
title_short |
Do Red Knots ( Calidris canutus islandica ) routinely skip Iceland during southward migration? |
title_full |
Do Red Knots ( Calidris canutus islandica ) routinely skip Iceland during southward migration? |
title_fullStr |
Do Red Knots ( Calidris canutus islandica ) routinely skip Iceland during southward migration? |
title_full_unstemmed |
Do Red Knots ( Calidris canutus islandica ) routinely skip Iceland during southward migration? |
title_sort |
do red knots ( calidris canutus islandica ) routinely skip iceland during southward migration? |
publishDate |
2010 |
url |
https://hdl.handle.net/11370/1eaec64f-4302-40b7-8aaf-8ce09711bb9d https://research.rug.nl/en/publications/1eaec64f-4302-40b7-8aaf-8ce09711bb9d https://doi.org/10.1525/cond.2010.090139 https://pure.rug.nl/ws/files/6744201/2010CondorDietz.pdf |
geographic |
Arctic Canada Greenland Norway |
geographic_facet |
Arctic Canada Greenland Norway |
genre |
Arctic Calidris canutus Greenland Iceland Northern Norway Red Knot Tundra |
genre_facet |
Arctic Calidris canutus Greenland Iceland Northern Norway Red Knot Tundra |
op_source |
Dietz , M W , Spaans , B , Dekinga , A , Klaassen , M , Korthals , H , van Leeuwen , C & Piersma , T 2010 , ' Do Red Knots ( Calidris canutus islandica ) routinely skip Iceland during southward migration? ' , Condor , vol. 112 , no. 1 , pp. 48-55 . https://doi.org/10.1525/cond.2010.090139 |
op_relation |
https://research.rug.nl/en/publications/1eaec64f-4302-40b7-8aaf-8ce09711bb9d |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1525/cond.2010.090139 |
container_title |
The Condor |
container_volume |
112 |
container_issue |
1 |
container_start_page |
48 |
op_container_end_page |
55 |
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1809896724990263296 |