Luck and tactics in foraging success: the case of the imperial shag
It has been proposed that predators searching for prey acquire food according to a probabilistic framework, where success is based on ‘luck’ and the odds of success vary with prey abundance. If true, this has major ramifications for variation in the rates of energy acquisition within animal populati...
Published in: | Marine Ecology Progress Series |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2022
|
Subjects: | |
Online Access: | https://oro.open.ac.uk/81667/ https://oro.open.ac.uk/81667/1/81667.pdf https://doi.org/10.3354/meps13967 |
id |
ftopenunivgb:oai:oro.open.ac.uk:81667 |
---|---|
record_format |
openpolar |
spelling |
ftopenunivgb:oai:oro.open.ac.uk:81667 2023-06-11T04:13:17+02:00 Luck and tactics in foraging success: the case of the imperial shag Wilson, Rory P. Holton, Mark D. Neate, Andrew Del’Caño, Monserrat Quintana, Flavio Yoda, Ken Gómez-Laich, Agustina 2022-01-20 application/pdf https://oro.open.ac.uk/81667/ https://oro.open.ac.uk/81667/1/81667.pdf https://doi.org/10.3354/meps13967 unknown https://oro.open.ac.uk/81667/1/81667.pdf Wilson, Rory P.; Holton, Mark D.; Neate, Andrew <http://oro.open.ac.uk/view/person/an6295.html>; Del’Caño, Monserrat; Quintana, Flavio; Yoda, Ken and Gómez-Laich, Agustina (2022). Luck and tactics in foraging success: the case of the imperial shag. Marine Ecology Progress Series, 682 pp. 1–12. Journal Item Public PeerReviewed 2022 ftopenunivgb https://doi.org/10.3354/meps13967 2023-05-28T06:06:57Z It has been proposed that predators searching for prey acquire food according to a probabilistic framework, where success is based on ‘luck’ and the odds of success vary with prey abundance. If true, this has major ramifications for variation in the rates of energy acquisition within animal populations, which is particularly pertinent in offspring provisioning and breeding success, because smaller animals (the young) cannot starve for as long as the adults. However, despite much general speculation about rates of food acquisition, no study has measured whether food encounter is probabilistic in wild animals. We used animal-mounted cameras to document all prey captures by wild imperial shags Leucocarbo atriceps as they hunted underwater and show that, although they mostly do not have inter-prey acquisition time distributions that accord with a ‘luck-based’ framework assuming a constant probability of finding prey over time, there is no difference in the predicted amount of food captured between models that use the empirical data or theoretical Poisson-based fits of the data. We also noted considerable inter-individual differences in foraging success that far exceeded any differences between empirical and theoretical inter-prey acquisition time distributions. The data were used in a probabilistic foraging model that made explicit the mechanistic link between random prey encounters and food-dependent breeding success, indicating that ‘less lucky’ individuals could not provision their broods at rates commensurate with normal growth while the ‘lucky’ birds could do so easily. Given the nature of food encounter in these birds, coupled with substantial inter-individual variation in foraging success, we suggest that more successful individuals are particularly choosey about when, how and where to forage, which results in them operating with higher odds of success. Article in Journal/Newspaper Imperial Shag The Open University: Open Research Online (ORO) Marine Ecology Progress Series 682 1 12 |
institution |
Open Polar |
collection |
The Open University: Open Research Online (ORO) |
op_collection_id |
ftopenunivgb |
language |
unknown |
description |
It has been proposed that predators searching for prey acquire food according to a probabilistic framework, where success is based on ‘luck’ and the odds of success vary with prey abundance. If true, this has major ramifications for variation in the rates of energy acquisition within animal populations, which is particularly pertinent in offspring provisioning and breeding success, because smaller animals (the young) cannot starve for as long as the adults. However, despite much general speculation about rates of food acquisition, no study has measured whether food encounter is probabilistic in wild animals. We used animal-mounted cameras to document all prey captures by wild imperial shags Leucocarbo atriceps as they hunted underwater and show that, although they mostly do not have inter-prey acquisition time distributions that accord with a ‘luck-based’ framework assuming a constant probability of finding prey over time, there is no difference in the predicted amount of food captured between models that use the empirical data or theoretical Poisson-based fits of the data. We also noted considerable inter-individual differences in foraging success that far exceeded any differences between empirical and theoretical inter-prey acquisition time distributions. The data were used in a probabilistic foraging model that made explicit the mechanistic link between random prey encounters and food-dependent breeding success, indicating that ‘less lucky’ individuals could not provision their broods at rates commensurate with normal growth while the ‘lucky’ birds could do so easily. Given the nature of food encounter in these birds, coupled with substantial inter-individual variation in foraging success, we suggest that more successful individuals are particularly choosey about when, how and where to forage, which results in them operating with higher odds of success. |
format |
Article in Journal/Newspaper |
author |
Wilson, Rory P. Holton, Mark D. Neate, Andrew Del’Caño, Monserrat Quintana, Flavio Yoda, Ken Gómez-Laich, Agustina |
spellingShingle |
Wilson, Rory P. Holton, Mark D. Neate, Andrew Del’Caño, Monserrat Quintana, Flavio Yoda, Ken Gómez-Laich, Agustina Luck and tactics in foraging success: the case of the imperial shag |
author_facet |
Wilson, Rory P. Holton, Mark D. Neate, Andrew Del’Caño, Monserrat Quintana, Flavio Yoda, Ken Gómez-Laich, Agustina |
author_sort |
Wilson, Rory P. |
title |
Luck and tactics in foraging success: the case of the imperial shag |
title_short |
Luck and tactics in foraging success: the case of the imperial shag |
title_full |
Luck and tactics in foraging success: the case of the imperial shag |
title_fullStr |
Luck and tactics in foraging success: the case of the imperial shag |
title_full_unstemmed |
Luck and tactics in foraging success: the case of the imperial shag |
title_sort |
luck and tactics in foraging success: the case of the imperial shag |
publishDate |
2022 |
url |
https://oro.open.ac.uk/81667/ https://oro.open.ac.uk/81667/1/81667.pdf https://doi.org/10.3354/meps13967 |
genre |
Imperial Shag |
genre_facet |
Imperial Shag |
op_relation |
https://oro.open.ac.uk/81667/1/81667.pdf Wilson, Rory P.; Holton, Mark D.; Neate, Andrew <http://oro.open.ac.uk/view/person/an6295.html>; Del’Caño, Monserrat; Quintana, Flavio; Yoda, Ken and Gómez-Laich, Agustina (2022). Luck and tactics in foraging success: the case of the imperial shag. Marine Ecology Progress Series, 682 pp. 1–12. |
op_doi |
https://doi.org/10.3354/meps13967 |
container_title |
Marine Ecology Progress Series |
container_volume |
682 |
container_start_page |
1 |
op_container_end_page |
12 |
_version_ |
1768390111344459776 |