The effect of group size on vigilance in Ruddy Turnstones Arenaria interpres varies with foraging habitat
Foraging birds can manage time spent vigilant for predators by forming groups of various sizes. However, group size alone will not always reliably determine the optimal level of vigilance. For example, variation in predation risk or food quality between patches may also be influential. In a field se...
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Online Access: | https://espace.library.uq.edu.au/view/UQ:298607 |
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:298607 2023-05-15T15:23:17+02:00 The effect of group size on vigilance in Ruddy Turnstones Arenaria interpres varies with foraging habitat Fuller, Richard A. Bearhop, Stuart Metcalfe, Neil B. Piersma, Theunis 2013-04-01 https://espace.library.uq.edu.au/view/UQ:298607 eng eng Wiley-Blackwell Publishing doi:10.1111/ibi.12020 issn:0019-1019 issn:1474-919X orcid:0000-0001-9468-9678 Not set Competition Density Group-size effect Predation 1105 Ecology Evolution Behavior and Systematics 2309 Nature and Landscape Conservation Journal Article 2013 ftunivqespace https://doi.org/10.1111/ibi.12020 2020-12-14T23:57:10Z Foraging birds can manage time spent vigilant for predators by forming groups of various sizes. However, group size alone will not always reliably determine the optimal level of vigilance. For example, variation in predation risk or food quality between patches may also be influential. In a field setting, we assessed how simultaneous variation in predation risk and intake rate affects the relationship between vigilance and group size in foraging Ruddy Turnstones Arenaria interpres. We compared vigilance, measured as the number of head-ups' per unit time, in habitat types that differed greatly in prey energy content and proximity to cover from which predators could launch surprise attacks. Habitats closer to predator cover provided foragers with much higher potential net energy intake rates than habitats further from cover. Foragers formed larger and denser flocks on habitats closer to cover. Individual vigilance of foragers in all habitats declined with increasing flock size and increased with flock density. However, vigilance by foragers on habitats closer to cover was always higher for a given flock size than vigilance by foragers on habitats further from cover, and habitat remained an important predictor of vigilance in models including a range of potential confounding variables. Our results suggest that foraging Ruddy Turnstones can simultaneously assess information on group size and the general likelihood of predator attack when determining their vigilance contribution. Article in Journal/Newspaper Arenaria interpres The University of Queensland: UQ eSpace Ibis 155 2 246 257 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Competition Density Group-size effect Predation 1105 Ecology Evolution Behavior and Systematics 2309 Nature and Landscape Conservation |
spellingShingle |
Competition Density Group-size effect Predation 1105 Ecology Evolution Behavior and Systematics 2309 Nature and Landscape Conservation Fuller, Richard A. Bearhop, Stuart Metcalfe, Neil B. Piersma, Theunis The effect of group size on vigilance in Ruddy Turnstones Arenaria interpres varies with foraging habitat |
topic_facet |
Competition Density Group-size effect Predation 1105 Ecology Evolution Behavior and Systematics 2309 Nature and Landscape Conservation |
description |
Foraging birds can manage time spent vigilant for predators by forming groups of various sizes. However, group size alone will not always reliably determine the optimal level of vigilance. For example, variation in predation risk or food quality between patches may also be influential. In a field setting, we assessed how simultaneous variation in predation risk and intake rate affects the relationship between vigilance and group size in foraging Ruddy Turnstones Arenaria interpres. We compared vigilance, measured as the number of head-ups' per unit time, in habitat types that differed greatly in prey energy content and proximity to cover from which predators could launch surprise attacks. Habitats closer to predator cover provided foragers with much higher potential net energy intake rates than habitats further from cover. Foragers formed larger and denser flocks on habitats closer to cover. Individual vigilance of foragers in all habitats declined with increasing flock size and increased with flock density. However, vigilance by foragers on habitats closer to cover was always higher for a given flock size than vigilance by foragers on habitats further from cover, and habitat remained an important predictor of vigilance in models including a range of potential confounding variables. Our results suggest that foraging Ruddy Turnstones can simultaneously assess information on group size and the general likelihood of predator attack when determining their vigilance contribution. |
format |
Article in Journal/Newspaper |
author |
Fuller, Richard A. Bearhop, Stuart Metcalfe, Neil B. Piersma, Theunis |
author_facet |
Fuller, Richard A. Bearhop, Stuart Metcalfe, Neil B. Piersma, Theunis |
author_sort |
Fuller, Richard A. |
title |
The effect of group size on vigilance in Ruddy Turnstones Arenaria interpres varies with foraging habitat |
title_short |
The effect of group size on vigilance in Ruddy Turnstones Arenaria interpres varies with foraging habitat |
title_full |
The effect of group size on vigilance in Ruddy Turnstones Arenaria interpres varies with foraging habitat |
title_fullStr |
The effect of group size on vigilance in Ruddy Turnstones Arenaria interpres varies with foraging habitat |
title_full_unstemmed |
The effect of group size on vigilance in Ruddy Turnstones Arenaria interpres varies with foraging habitat |
title_sort |
effect of group size on vigilance in ruddy turnstones arenaria interpres varies with foraging habitat |
publisher |
Wiley-Blackwell Publishing |
publishDate |
2013 |
url |
https://espace.library.uq.edu.au/view/UQ:298607 |
genre |
Arenaria interpres |
genre_facet |
Arenaria interpres |
op_relation |
doi:10.1111/ibi.12020 issn:0019-1019 issn:1474-919X orcid:0000-0001-9468-9678 Not set |
op_doi |
https://doi.org/10.1111/ibi.12020 |
container_title |
Ibis |
container_volume |
155 |
container_issue |
2 |
container_start_page |
246 |
op_container_end_page |
257 |
_version_ |
1766353993148137472 |