Data from: 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 (Banc...
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ftdryad:oai:v1.datadryad.org:10255/dryad.131353 2023-05-15T15:48:28+02:00 Data from: 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 2016-11-16T16:58:08Z http://hdl.handle.net/10255/dryad.131353 https://doi.org/10.5061/dryad.75s6t unknown doi:10.5061/dryad.75s6t/1 doi:10.1093/beheco/arw173 doi:10.5061/dryad.75s6t van den Hout PJ, 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 28(2): 419-428. 1045-2249 http://hdl.handle.net/10255/dryad.131353 age foraging proficiency habitat use safety survival Article 2016 ftdryad https://doi.org/10.5061/dryad.75s6t https://doi.org/10.5061/dryad.75s6t/1 https://doi.org/10.1093/beheco/arw173 2020-01-01T15:43:13Z 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 Dryad Digital Repository (Duke University) |
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Open Polar |
collection |
Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
age foraging proficiency habitat use safety survival |
spellingShingle |
age foraging proficiency habitat use safety survival van den Hout, Piet J. Piersma, Theunis ten Horn, Job Spaans, Bernard Lok, Tamar Data from: Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
topic_facet |
age foraging proficiency habitat use safety survival |
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 |
author_facet |
van den Hout, Piet J. Piersma, Theunis ten Horn, Job Spaans, Bernard Lok, Tamar |
author_sort |
van den Hout, Piet J. |
title |
Data from: Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
title_short |
Data from: Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
title_full |
Data from: Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
title_fullStr |
Data from: Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
title_full_unstemmed |
Data from: Individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
title_sort |
data from: individual shifts toward safety explain age-related foraging distribution in a gregarious shorebird |
publishDate |
2016 |
url |
http://hdl.handle.net/10255/dryad.131353 https://doi.org/10.5061/dryad.75s6t |
genre |
Calidris canutus |
genre_facet |
Calidris canutus |
op_relation |
doi:10.5061/dryad.75s6t/1 doi:10.1093/beheco/arw173 doi:10.5061/dryad.75s6t van den Hout PJ, 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 28(2): 419-428. 1045-2249 http://hdl.handle.net/10255/dryad.131353 |
op_doi |
https://doi.org/10.5061/dryad.75s6t https://doi.org/10.5061/dryad.75s6t/1 https://doi.org/10.1093/beheco/arw173 |
_version_ |
1766383435602984960 |