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Inter-individual differences in foraging tactics of a colonial raptor: consistency, weather effects, and fitness correlates
BACKGROUND: Consistent inter-individual differences in behavioural phenotypes may entail differences in energy efficiency and expenditure, with different fitness payoffs. In colonial-breeding species, inter-individual differences in foraging behaviour may evolve to reduce resource use overlap among...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7313117/ https://www.ncbi.nlm.nih.gov/pubmed/32587702 http://dx.doi.org/10.1186/s40462-020-00206-w |
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author | Cecere, Jacopo G. De Pascalis, Federico Imperio, Simona Ménard, Delphine Catoni, Carlo Griggio, Matteo Rubolini, Diego |
author_facet | Cecere, Jacopo G. De Pascalis, Federico Imperio, Simona Ménard, Delphine Catoni, Carlo Griggio, Matteo Rubolini, Diego |
author_sort | Cecere, Jacopo G. |
collection | PubMed |
description | BACKGROUND: Consistent inter-individual differences in behavioural phenotypes may entail differences in energy efficiency and expenditure, with different fitness payoffs. In colonial-breeding species, inter-individual differences in foraging behaviour may evolve to reduce resource use overlap among conspecifics exploiting shared foraging areas. Furthermore, individual differences in foraging behaviour may covary with individual characteristics, such as sex or physiological conditions. METHODS: We investigated individual differences in foraging tactics of a colonial raptor, the lesser kestrel (Falco naumanni). We tracked foraging trips of breeding individuals using miniaturized biologgers. We classified behaviours from GPS data and identified tactics at the foraging trip level by cluster analysis. We then estimated energy expenditure associated to each tactic from tri-axial accelerometer data. RESULTS: We obtained 489 foraging trips by 36 individuals. Two clusters of trips were identified, one (SF) characterized by more static foraging behaviour and the other (DF) by more dynamic foraging behaviour, with a higher proportion of flying activity and a higher energy expenditure compared to SF. Lesser kestrels showed consistent inter-individual differences in foraging tactics across weather condition gradients, favouring DF trips as solar radiation and crosswind intensity increased. DF trips were more frequent during the nestling-rearing than during the egg incubation stage. Nestlings whose tracked parent was more prone to perform DF trips experienced higher daily mass increase, irrespective of nestling feeding rates. CONCLUSIONS: Our study provided evidence that breeding lesser kestrels flexibly adopted different foraging tactics according to contingent weather landscapes, with birds showing consistent inter-individual differences in the tendency to adopt a given tactic. The positive correlation between the tendency to perform more energy-demanding DF trips and nestling growth suggests that individual differences in foraging behaviour may play a role in maintaining key life-history trade-offs between reproduction and self-maintenance. |
format | Online Article Text |
id | pubmed-7313117 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-73131172020-06-24 Inter-individual differences in foraging tactics of a colonial raptor: consistency, weather effects, and fitness correlates Cecere, Jacopo G. De Pascalis, Federico Imperio, Simona Ménard, Delphine Catoni, Carlo Griggio, Matteo Rubolini, Diego Mov Ecol Research BACKGROUND: Consistent inter-individual differences in behavioural phenotypes may entail differences in energy efficiency and expenditure, with different fitness payoffs. In colonial-breeding species, inter-individual differences in foraging behaviour may evolve to reduce resource use overlap among conspecifics exploiting shared foraging areas. Furthermore, individual differences in foraging behaviour may covary with individual characteristics, such as sex or physiological conditions. METHODS: We investigated individual differences in foraging tactics of a colonial raptor, the lesser kestrel (Falco naumanni). We tracked foraging trips of breeding individuals using miniaturized biologgers. We classified behaviours from GPS data and identified tactics at the foraging trip level by cluster analysis. We then estimated energy expenditure associated to each tactic from tri-axial accelerometer data. RESULTS: We obtained 489 foraging trips by 36 individuals. Two clusters of trips were identified, one (SF) characterized by more static foraging behaviour and the other (DF) by more dynamic foraging behaviour, with a higher proportion of flying activity and a higher energy expenditure compared to SF. Lesser kestrels showed consistent inter-individual differences in foraging tactics across weather condition gradients, favouring DF trips as solar radiation and crosswind intensity increased. DF trips were more frequent during the nestling-rearing than during the egg incubation stage. Nestlings whose tracked parent was more prone to perform DF trips experienced higher daily mass increase, irrespective of nestling feeding rates. CONCLUSIONS: Our study provided evidence that breeding lesser kestrels flexibly adopted different foraging tactics according to contingent weather landscapes, with birds showing consistent inter-individual differences in the tendency to adopt a given tactic. The positive correlation between the tendency to perform more energy-demanding DF trips and nestling growth suggests that individual differences in foraging behaviour may play a role in maintaining key life-history trade-offs between reproduction and self-maintenance. BioMed Central 2020-06-24 /pmc/articles/PMC7313117/ /pubmed/32587702 http://dx.doi.org/10.1186/s40462-020-00206-w Text en © The Author(s) 2020 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data. |
spellingShingle | Research Cecere, Jacopo G. De Pascalis, Federico Imperio, Simona Ménard, Delphine Catoni, Carlo Griggio, Matteo Rubolini, Diego Inter-individual differences in foraging tactics of a colonial raptor: consistency, weather effects, and fitness correlates |
title | Inter-individual differences in foraging tactics of a colonial raptor: consistency, weather effects, and fitness correlates |
title_full | Inter-individual differences in foraging tactics of a colonial raptor: consistency, weather effects, and fitness correlates |
title_fullStr | Inter-individual differences in foraging tactics of a colonial raptor: consistency, weather effects, and fitness correlates |
title_full_unstemmed | Inter-individual differences in foraging tactics of a colonial raptor: consistency, weather effects, and fitness correlates |
title_short | Inter-individual differences in foraging tactics of a colonial raptor: consistency, weather effects, and fitness correlates |
title_sort | inter-individual differences in foraging tactics of a colonial raptor: consistency, weather effects, and fitness correlates |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7313117/ https://www.ncbi.nlm.nih.gov/pubmed/32587702 http://dx.doi.org/10.1186/s40462-020-00206-w |
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