Peregrine falcons shift mean and variance in provisioning in response to increasing brood demand
Abstract The hierarchical model of provisioning posits that parents employ a strategic, sequential use of three provisioning tactics as offspring demand increases (e.g., due to increasing brood size and age). Namely, increasing delivery rate (reducing intervals between provisioning visits), expandin...
Published in: | Behavioral Ecology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Oxford University Press (OUP)
2023
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Online Access: | http://dx.doi.org/10.1093/beheco/arad103 https://academic.oup.com/beheco/article-pdf/35/1/arad103/54764287/arad103.pdf |
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croxfordunivpr:10.1093/beheco/arad103 2024-04-07T07:50:30+00:00 Peregrine falcons shift mean and variance in provisioning in response to increasing brood demand McKinnon, Rebekah A Hawkshaw, Kevin Hedlin, Erik Nakagawa, Shinichi Mathot, Kimberley J Buston, Peter Natural Sciences and Engineering Research Council of Canada Alastair Franke Alastair Franke Nunavut Arctic College and Agnico Eagle Mines 2023 http://dx.doi.org/10.1093/beheco/arad103 https://academic.oup.com/beheco/article-pdf/35/1/arad103/54764287/arad103.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ Behavioral Ecology volume 35, issue 1 ISSN 1045-2249 1465-7279 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2023 croxfordunivpr https://doi.org/10.1093/beheco/arad103 2024-03-08T02:56:12Z Abstract The hierarchical model of provisioning posits that parents employ a strategic, sequential use of three provisioning tactics as offspring demand increases (e.g., due to increasing brood size and age). Namely, increasing delivery rate (reducing intervals between provisioning visits), expanding provisioned diet breadth, and adopting variance-sensitive provisioning. We evaluated this model in an Arctic breeding population of Peregrine falcons (Falco peregrinus tundrius) by analyzing changes in inter-visit-intervals (IVIs) and residual variance in IVIs across 7 study years. Data were collected using motion-sensitive nest camera images and analyzed using Bayesian mixed effect models. We found strong support for a decrease in IVIs (i.e., increase in delivery rates) between provisioning visits and an increase in residual variance in IVIs with increasing nestling age, consistent with the notion that peregrines shift to variance-prone provisioning strategies with increasing nestling demand. However, support for predictions made based on the hierarchical model of tactics for coping with increased brood demand was equivocal as we did not find evidence in support of expected covariances between random effects (i.e., between IVI to an average sized brood (intercept), change in IVI with brood demand (slope) or variance in IVI). Overall, our study provides important biological insights into how parents cope with increased brood demand. Article in Journal/Newspaper Arctic Falco peregrinus Oxford University Press Arctic Behavioral Ecology 35 1 |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics McKinnon, Rebekah A Hawkshaw, Kevin Hedlin, Erik Nakagawa, Shinichi Mathot, Kimberley J Peregrine falcons shift mean and variance in provisioning in response to increasing brood demand |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Abstract The hierarchical model of provisioning posits that parents employ a strategic, sequential use of three provisioning tactics as offspring demand increases (e.g., due to increasing brood size and age). Namely, increasing delivery rate (reducing intervals between provisioning visits), expanding provisioned diet breadth, and adopting variance-sensitive provisioning. We evaluated this model in an Arctic breeding population of Peregrine falcons (Falco peregrinus tundrius) by analyzing changes in inter-visit-intervals (IVIs) and residual variance in IVIs across 7 study years. Data were collected using motion-sensitive nest camera images and analyzed using Bayesian mixed effect models. We found strong support for a decrease in IVIs (i.e., increase in delivery rates) between provisioning visits and an increase in residual variance in IVIs with increasing nestling age, consistent with the notion that peregrines shift to variance-prone provisioning strategies with increasing nestling demand. However, support for predictions made based on the hierarchical model of tactics for coping with increased brood demand was equivocal as we did not find evidence in support of expected covariances between random effects (i.e., between IVI to an average sized brood (intercept), change in IVI with brood demand (slope) or variance in IVI). Overall, our study provides important biological insights into how parents cope with increased brood demand. |
author2 |
Buston, Peter Natural Sciences and Engineering Research Council of Canada Alastair Franke Alastair Franke Nunavut Arctic College and Agnico Eagle Mines |
format |
Article in Journal/Newspaper |
author |
McKinnon, Rebekah A Hawkshaw, Kevin Hedlin, Erik Nakagawa, Shinichi Mathot, Kimberley J |
author_facet |
McKinnon, Rebekah A Hawkshaw, Kevin Hedlin, Erik Nakagawa, Shinichi Mathot, Kimberley J |
author_sort |
McKinnon, Rebekah A |
title |
Peregrine falcons shift mean and variance in provisioning in response to increasing brood demand |
title_short |
Peregrine falcons shift mean and variance in provisioning in response to increasing brood demand |
title_full |
Peregrine falcons shift mean and variance in provisioning in response to increasing brood demand |
title_fullStr |
Peregrine falcons shift mean and variance in provisioning in response to increasing brood demand |
title_full_unstemmed |
Peregrine falcons shift mean and variance in provisioning in response to increasing brood demand |
title_sort |
peregrine falcons shift mean and variance in provisioning in response to increasing brood demand |
publisher |
Oxford University Press (OUP) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1093/beheco/arad103 https://academic.oup.com/beheco/article-pdf/35/1/arad103/54764287/arad103.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Falco peregrinus |
genre_facet |
Arctic Falco peregrinus |
op_source |
Behavioral Ecology volume 35, issue 1 ISSN 1045-2249 1465-7279 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/beheco/arad103 |
container_title |
Behavioral Ecology |
container_volume |
35 |
container_issue |
1 |
_version_ |
1795665204690812928 |