Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird
Although age-related spatial segregation is ubiquitous, the underlying mechanisms are poorly understood. Here, we aim to elucidate the processes behind a previously established age-related foraging distribution of red knots ( Calidris canutus canutus ) in their main wintering area in West Africa (Ba...
Published in: | Behavioral Ecology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2017
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Online Access: | https://hdl.handle.net/11370/e140a340-5063-49c3-9435-cb460f393eda https://research.rug.nl/en/publications/e140a340-5063-49c3-9435-cb460f393eda https://doi.org/10.1093/beheco/arw173 https://pure.rug.nl/ws/files/41719344/BehavEcol2017_safety_careers_in_red_knots_at_BancdArguin_vandenHout_et_al.pdf |
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ftunigroningenpu:oai:pure.rug.nl:publications/e140a340-5063-49c3-9435-cb460f393eda 2024-06-23T07:51:55+00:00 Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird van den Hout, Piet J. Piersma, Theunis ten Horn, Job Spaans, Bernard Lok, Tamar 2017-03 application/pdf https://hdl.handle.net/11370/e140a340-5063-49c3-9435-cb460f393eda https://research.rug.nl/en/publications/e140a340-5063-49c3-9435-cb460f393eda https://doi.org/10.1093/beheco/arw173 https://pure.rug.nl/ws/files/41719344/BehavEcol2017_safety_careers_in_red_knots_at_BancdArguin_vandenHout_et_al.pdf eng eng https://research.rug.nl/en/publications/e140a340-5063-49c3-9435-cb460f393eda info:eu-repo/semantics/openAccess van den Hout , P J , Piersma , T , ten Horn , J , Spaans , B & Lok , T 2017 , ' Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird ' , Behavioral Ecology , vol. 28 , no. 2 , pp. 419-428 . https://doi.org/10.1093/beheco/arw173 article 2017 ftunigroningenpu https://doi.org/10.1093/beheco/arw173 2024-06-10T16:25:50Z Although age-related spatial segregation is ubiquitous, the underlying mechanisms are poorly understood. Here, we aim to elucidate the processes behind a previously established age-related foraging distribution of red knots ( Calidris canutus canutus ) in their main wintering area in West Africa (Banc d’Arguin, Mauritania). Based on 10 years of observations of 1232 uniquely color-ringed individuals of 1 to 18+ years old, we examined whether the observed age-related foraging distribution resulted from 1) spatial differences in mortality or 2) age-related shifts in habitat use. Using multistate capture–recapture modeling, we showed that with age foraging red knots moved away from the shoreline, that is, to areas with fewer surprise attacks by raptors. Considering uncertainties in the subjective gradient in predation danger with increasing distance from shore (as assessed from correlations between vigilance and distance from shore in foraging birds), we applied 2 different danger zone boundaries, at 40 m and 500 m from shore. Between years, red knots had a much higher chance to move from the dangerous nearshore area to the “safe” area beyond (71–78% and 26% for 40-m and 500-m danger zone boundary, respectively), than vice versa (4% and 14%). For neither danger zone boundary value did we find differences in annual mortality for individuals using either dangerous or safe zone, so the move away from the shore with age is attributed to individual careers rather than differential mortality. We argue that longitudinal studies like ours will reveal that ontogenetic shifts in habitat use are more common than so far acknowledged. Article in Journal/Newspaper Calidris canutus University of Groningen research database Behavioral Ecology arw173 |
institution |
Open Polar |
collection |
University of Groningen research database |
op_collection_id |
ftunigroningenpu |
language |
English |
description |
Although age-related spatial segregation is ubiquitous, the underlying mechanisms are poorly understood. Here, we aim to elucidate the processes behind a previously established age-related foraging distribution of red knots ( Calidris canutus canutus ) in their main wintering area in West Africa (Banc d’Arguin, Mauritania). Based on 10 years of observations of 1232 uniquely color-ringed individuals of 1 to 18+ years old, we examined whether the observed age-related foraging distribution resulted from 1) spatial differences in mortality or 2) age-related shifts in habitat use. Using multistate capture–recapture modeling, we showed that with age foraging red knots moved away from the shoreline, that is, to areas with fewer surprise attacks by raptors. Considering uncertainties in the subjective gradient in predation danger with increasing distance from shore (as assessed from correlations between vigilance and distance from shore in foraging birds), we applied 2 different danger zone boundaries, at 40 m and 500 m from shore. Between years, red knots had a much higher chance to move from the dangerous nearshore area to the “safe” area beyond (71–78% and 26% for 40-m and 500-m danger zone boundary, respectively), than vice versa (4% and 14%). For neither danger zone boundary value did we find differences in annual mortality for individuals using either dangerous or safe zone, so the move away from the shore with age is attributed to individual careers rather than differential mortality. We argue that longitudinal studies like ours will reveal that ontogenetic shifts in habitat use are more common than so far acknowledged. |
format |
Article in Journal/Newspaper |
author |
van den Hout, Piet J. Piersma, Theunis ten Horn, Job Spaans, Bernard Lok, Tamar |
spellingShingle |
van den Hout, Piet J. Piersma, Theunis ten Horn, Job Spaans, Bernard Lok, Tamar Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
author_facet |
van den Hout, Piet J. Piersma, Theunis ten Horn, Job Spaans, Bernard Lok, Tamar |
author_sort |
van den Hout, Piet J. |
title |
Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
title_short |
Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
title_full |
Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
title_fullStr |
Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
title_full_unstemmed |
Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
title_sort |
individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
publishDate |
2017 |
url |
https://hdl.handle.net/11370/e140a340-5063-49c3-9435-cb460f393eda https://research.rug.nl/en/publications/e140a340-5063-49c3-9435-cb460f393eda https://doi.org/10.1093/beheco/arw173 https://pure.rug.nl/ws/files/41719344/BehavEcol2017_safety_careers_in_red_knots_at_BancdArguin_vandenHout_et_al.pdf |
genre |
Calidris canutus |
genre_facet |
Calidris canutus |
op_source |
van den Hout , P J , Piersma , T , ten Horn , J , Spaans , B & Lok , T 2017 , ' Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird ' , Behavioral Ecology , vol. 28 , no. 2 , pp. 419-428 . https://doi.org/10.1093/beheco/arw173 |
op_relation |
https://research.rug.nl/en/publications/e140a340-5063-49c3-9435-cb460f393eda |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/beheco/arw173 |
container_title |
Behavioral Ecology |
container_start_page |
arw173 |
_version_ |
1802643076890492928 |