Small-scale demographic structure suggests preemptive behavior in a flocking shorebird
Under the ideal-free distribution, omniscient individuals with similar habitat requirements that are free to move should be distributed such that no individual can improve fitness by changing sites; deviations would indicate trade-offs and constraints on ranging behavior. We studied site occupancy a...
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Oxford University Press
2012
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Online Access: | http://beheco.oxfordjournals.org/cgi/content/short/23/6/1226 https://doi.org/10.1093/beheco/ars106 |
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fthighwire:oai:open-archive.highwire.org:beheco:23/6/1226 2023-05-15T15:11:22+02:00 Small-scale demographic structure suggests preemptive behavior in a flocking shorebird Leyrer, Jutta Lok, Tamar Brugge, Maarten Dekinga, Anne Spaans, Bernard van Gils, Jan A. Sandercock, Brett K. Piersma, Theunis 2012-11-01 00:00:00.0 text/html http://beheco.oxfordjournals.org/cgi/content/short/23/6/1226 https://doi.org/10.1093/beheco/ars106 en eng Oxford University Press http://beheco.oxfordjournals.org/cgi/content/short/23/6/1226 http://dx.doi.org/10.1093/beheco/ars106 Copyright (C) 2012, International Society for Behavioral Ecology Research Article TEXT 2012 fthighwire https://doi.org/10.1093/beheco/ars106 2015-02-28T17:59:57Z Under the ideal-free distribution, omniscient individuals with similar habitat requirements that are free to move should be distributed such that no individual can improve fitness by changing sites; deviations would indicate trade-offs and constraints on ranging behavior. We studied site occupancy and annual survival in red knots Calidris c. canutus at their main wintering area Banc d’Arguin, Mauritania. We collected mark-resighting data at 2 high-tide roosts (A and B) that were only 3 km apart and within sight. Birds were faithful to their roosts and foraged in nearby intertidal areas, with no overlap between birds from A and B. Shellfish-rich seagrass beds were of greater abundance for birds roosting at A than at B. During 8 winters, we found different sex ratios (48% and 58% males at A and B, respectively) and different proportion of juveniles (22% and 45%) at the 2 roosts. Adult annual survival was higher at A (0.83±0.01 standard error [SE]) than at B (0.81±0.03). Though rare, between winter season movements were 3 times more frequent from B to A than vice versa, indicating that knots can assess the differences in site quality: birds behaved as if they were “ideal”. As larger females and older birds occurred more at A, differences in competitive ability might maintain the site occupancy pattern. As females return from the high Arctic breeding grounds first, and adults return before juveniles, priority of occupancy may also play a role. Such an advantage of arriving earlier would represent a seasonal carryover effect. Text Arctic HighWire Press (Stanford University) Arctic Behavioral Ecology 23 6 1226 1233 |
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HighWire Press (Stanford University) |
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English |
topic |
Research Article |
spellingShingle |
Research Article Leyrer, Jutta Lok, Tamar Brugge, Maarten Dekinga, Anne Spaans, Bernard van Gils, Jan A. Sandercock, Brett K. Piersma, Theunis Small-scale demographic structure suggests preemptive behavior in a flocking shorebird |
topic_facet |
Research Article |
description |
Under the ideal-free distribution, omniscient individuals with similar habitat requirements that are free to move should be distributed such that no individual can improve fitness by changing sites; deviations would indicate trade-offs and constraints on ranging behavior. We studied site occupancy and annual survival in red knots Calidris c. canutus at their main wintering area Banc d’Arguin, Mauritania. We collected mark-resighting data at 2 high-tide roosts (A and B) that were only 3 km apart and within sight. Birds were faithful to their roosts and foraged in nearby intertidal areas, with no overlap between birds from A and B. Shellfish-rich seagrass beds were of greater abundance for birds roosting at A than at B. During 8 winters, we found different sex ratios (48% and 58% males at A and B, respectively) and different proportion of juveniles (22% and 45%) at the 2 roosts. Adult annual survival was higher at A (0.83±0.01 standard error [SE]) than at B (0.81±0.03). Though rare, between winter season movements were 3 times more frequent from B to A than vice versa, indicating that knots can assess the differences in site quality: birds behaved as if they were “ideal”. As larger females and older birds occurred more at A, differences in competitive ability might maintain the site occupancy pattern. As females return from the high Arctic breeding grounds first, and adults return before juveniles, priority of occupancy may also play a role. Such an advantage of arriving earlier would represent a seasonal carryover effect. |
format |
Text |
author |
Leyrer, Jutta Lok, Tamar Brugge, Maarten Dekinga, Anne Spaans, Bernard van Gils, Jan A. Sandercock, Brett K. Piersma, Theunis |
author_facet |
Leyrer, Jutta Lok, Tamar Brugge, Maarten Dekinga, Anne Spaans, Bernard van Gils, Jan A. Sandercock, Brett K. Piersma, Theunis |
author_sort |
Leyrer, Jutta |
title |
Small-scale demographic structure suggests preemptive behavior in a flocking shorebird |
title_short |
Small-scale demographic structure suggests preemptive behavior in a flocking shorebird |
title_full |
Small-scale demographic structure suggests preemptive behavior in a flocking shorebird |
title_fullStr |
Small-scale demographic structure suggests preemptive behavior in a flocking shorebird |
title_full_unstemmed |
Small-scale demographic structure suggests preemptive behavior in a flocking shorebird |
title_sort |
small-scale demographic structure suggests preemptive behavior in a flocking shorebird |
publisher |
Oxford University Press |
publishDate |
2012 |
url |
http://beheco.oxfordjournals.org/cgi/content/short/23/6/1226 https://doi.org/10.1093/beheco/ars106 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
http://beheco.oxfordjournals.org/cgi/content/short/23/6/1226 http://dx.doi.org/10.1093/beheco/ars106 |
op_rights |
Copyright (C) 2012, International Society for Behavioral Ecology |
op_doi |
https://doi.org/10.1093/beheco/ars106 |
container_title |
Behavioral Ecology |
container_volume |
23 |
container_issue |
6 |
container_start_page |
1226 |
op_container_end_page |
1233 |
_version_ |
1766342227525632000 |