Is individual consistency in body mass and reproductive decisions linked to individual specialization in foraging behavior in a long-lived seabird?
peer reviewed Individual specialization in diet or foraging behavior within apparently generalist populations has been described for many species, especially in polar and temperate marine environments, where resource distribution is relatively predictable. It is unclear, however, whether and how inc...
Published in: | Ecology and Evolution |
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Online Access: | https://orbi.uliege.be/handle/2268/198407 https://orbi.uliege.be/bitstream/2268/198407/1/Dehnhard%20et%20al.%202015_Ecology%26Evolution.pdf https://doi.org/10.1002/ece3.2213 |
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ftorbi:oai:orbi.ulg.ac.be:2268/198407 2024-04-21T07:51:33+00:00 Is individual consistency in body mass and reproductive decisions linked to individual specialization in foraging behavior in a long-lived seabird? Dehnhard, Nina Eens, Marcel Sturaro, Nicolas Lepoint, Gilles Demongin, Laurent Quillfeldt, Petra Poisbleau, Maud MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège 2016 https://orbi.uliege.be/handle/2268/198407 https://orbi.uliege.be/bitstream/2268/198407/1/Dehnhard%20et%20al.%202015_Ecology%26Evolution.pdf https://doi.org/10.1002/ece3.2213 en eng Wiley urn:issn:2045-7758 https://orbi.uliege.be/handle/2268/198407 info:hdl:2268/198407 https://orbi.uliege.be/bitstream/2268/198407/1/Dehnhard%20et%20al.%202015_Ecology%26Evolution.pdf doi:10.1002/ece3.2213 scopus-id:2-s2.0-84977479003 info:pmid:27386091 open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Ecology and Evolution (2016) seabirds stable isotopes Sub Antarctic global climate change Life sciences Environmental sciences & ecology Zoology Aquatic sciences & oceanology Sciences du vivant Sciences de l’environnement & écologie Zoologie Sciences aquatiques & océanologie journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2016 ftorbi https://doi.org/10.1002/ece3.2213 2024-03-27T14:52:54Z peer reviewed Individual specialization in diet or foraging behavior within apparently generalist populations has been described for many species, especially in polar and temperate marine environments, where resource distribution is relatively predictable. It is unclear, however, whether and how increased environmental variability – and thus reduced predictability of resources – due to global climate change will affect individual specialization. We determined the within- and among-individual components of the trophic niche and the within-individual repeatability of d13C and d15N in feathers and red blood cells of individual female southern rockhopper penguins (Eudyptes chrysocome) across 7 years. We also investigated the effect of environmental variables (Southern Annular Mode, Southern Oscillation Index, and local sea surface temperature anomaly) on the isotopic values, as well as the link between stable isotopes and female body mass, clutch initiation dates, and total clutch mass. We observed consistent red blood cell d13C and d15N values within individuals among years, suggesting a moderate degree of within-individual specialization in C and N during the prebreeding period. However, the total niche width was reduced and individual specialization not present during the premolt period. Despite significant interannual differences in isotope values of C and N and environmental conditions, none of the environmental variables were linked to stable isotope values and thus able to explain phenotypic plasticity. Furthermore, neither the within-individual nor among-individual effects of stable isotopes were found to be related to female body mass, clutch initiation date, or total clutch mass. In conclusion, our results emphasize that the degree of specialization within generalist populations can vary over the course of 1 year, even when being consistent within the same season across years. We were unable to confirm that environmental variability counteracts individual specialization in foraging behavior, as ... Article in Journal/Newspaper Antarc* Antarctic University of Liège: ORBi (Open Repository and Bibliography) Ecology and Evolution 6 13 4488 4501 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
seabirds stable isotopes Sub Antarctic global climate change Life sciences Environmental sciences & ecology Zoology Aquatic sciences & oceanology Sciences du vivant Sciences de l’environnement & écologie Zoologie Sciences aquatiques & océanologie |
spellingShingle |
seabirds stable isotopes Sub Antarctic global climate change Life sciences Environmental sciences & ecology Zoology Aquatic sciences & oceanology Sciences du vivant Sciences de l’environnement & écologie Zoologie Sciences aquatiques & océanologie Dehnhard, Nina Eens, Marcel Sturaro, Nicolas Lepoint, Gilles Demongin, Laurent Quillfeldt, Petra Poisbleau, Maud Is individual consistency in body mass and reproductive decisions linked to individual specialization in foraging behavior in a long-lived seabird? |
topic_facet |
seabirds stable isotopes Sub Antarctic global climate change Life sciences Environmental sciences & ecology Zoology Aquatic sciences & oceanology Sciences du vivant Sciences de l’environnement & écologie Zoologie Sciences aquatiques & océanologie |
description |
peer reviewed Individual specialization in diet or foraging behavior within apparently generalist populations has been described for many species, especially in polar and temperate marine environments, where resource distribution is relatively predictable. It is unclear, however, whether and how increased environmental variability – and thus reduced predictability of resources – due to global climate change will affect individual specialization. We determined the within- and among-individual components of the trophic niche and the within-individual repeatability of d13C and d15N in feathers and red blood cells of individual female southern rockhopper penguins (Eudyptes chrysocome) across 7 years. We also investigated the effect of environmental variables (Southern Annular Mode, Southern Oscillation Index, and local sea surface temperature anomaly) on the isotopic values, as well as the link between stable isotopes and female body mass, clutch initiation dates, and total clutch mass. We observed consistent red blood cell d13C and d15N values within individuals among years, suggesting a moderate degree of within-individual specialization in C and N during the prebreeding period. However, the total niche width was reduced and individual specialization not present during the premolt period. Despite significant interannual differences in isotope values of C and N and environmental conditions, none of the environmental variables were linked to stable isotope values and thus able to explain phenotypic plasticity. Furthermore, neither the within-individual nor among-individual effects of stable isotopes were found to be related to female body mass, clutch initiation date, or total clutch mass. In conclusion, our results emphasize that the degree of specialization within generalist populations can vary over the course of 1 year, even when being consistent within the same season across years. We were unable to confirm that environmental variability counteracts individual specialization in foraging behavior, as ... |
author2 |
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège |
format |
Article in Journal/Newspaper |
author |
Dehnhard, Nina Eens, Marcel Sturaro, Nicolas Lepoint, Gilles Demongin, Laurent Quillfeldt, Petra Poisbleau, Maud |
author_facet |
Dehnhard, Nina Eens, Marcel Sturaro, Nicolas Lepoint, Gilles Demongin, Laurent Quillfeldt, Petra Poisbleau, Maud |
author_sort |
Dehnhard, Nina |
title |
Is individual consistency in body mass and reproductive decisions linked to individual specialization in foraging behavior in a long-lived seabird? |
title_short |
Is individual consistency in body mass and reproductive decisions linked to individual specialization in foraging behavior in a long-lived seabird? |
title_full |
Is individual consistency in body mass and reproductive decisions linked to individual specialization in foraging behavior in a long-lived seabird? |
title_fullStr |
Is individual consistency in body mass and reproductive decisions linked to individual specialization in foraging behavior in a long-lived seabird? |
title_full_unstemmed |
Is individual consistency in body mass and reproductive decisions linked to individual specialization in foraging behavior in a long-lived seabird? |
title_sort |
is individual consistency in body mass and reproductive decisions linked to individual specialization in foraging behavior in a long-lived seabird? |
publisher |
Wiley |
publishDate |
2016 |
url |
https://orbi.uliege.be/handle/2268/198407 https://orbi.uliege.be/bitstream/2268/198407/1/Dehnhard%20et%20al.%202015_Ecology%26Evolution.pdf https://doi.org/10.1002/ece3.2213 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Ecology and Evolution (2016) |
op_relation |
urn:issn:2045-7758 https://orbi.uliege.be/handle/2268/198407 info:hdl:2268/198407 https://orbi.uliege.be/bitstream/2268/198407/1/Dehnhard%20et%20al.%202015_Ecology%26Evolution.pdf doi:10.1002/ece3.2213 scopus-id:2-s2.0-84977479003 info:pmid:27386091 |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/ece3.2213 |
container_title |
Ecology and Evolution |
container_volume |
6 |
container_issue |
13 |
container_start_page |
4488 |
op_container_end_page |
4501 |
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1796934895357919232 |