Drivers of intrapopulation variation in resource use in a generalist predator, the macaroni penguin
Intrapopulation variation in resource use occurs in many populations of generalist predators with important community and evolutionary implications. One of the hypothesised mechanisms for such widespread variation is ecological opportunity, i.e. resource availability determined by intrinsic constrai...
Published in: | Marine Ecology Progress Series |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Inter-Research
2016
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/513917/ https://nora.nerc.ac.uk/id/eprint/513917/1/m548p233.pdf https://doi.org/10.3354/meps11626 |
id |
ftnerc:oai:nora.nerc.ac.uk:513917 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:513917 2023-05-15T16:08:22+02:00 Drivers of intrapopulation variation in resource use in a generalist predator, the macaroni penguin Horswill, C. Matthiopoulos, J. Ratcliffe, N. Green, J.A. Trathan, P.N. McGill, R.A.R. Phillips, R.A. O’Connell, T.C. 2016-04 text http://nora.nerc.ac.uk/id/eprint/513917/ https://nora.nerc.ac.uk/id/eprint/513917/1/m548p233.pdf https://doi.org/10.3354/meps11626 en eng Inter-Research https://nora.nerc.ac.uk/id/eprint/513917/1/m548p233.pdf Horswill, C. orcid:0000-0002-1795-0753 Matthiopoulos, J.; Ratcliffe, N. orcid:0000-0002-3375-2431 Green, J.A.; Trathan, P.N. orcid:0000-0001-6673-9930 McGill, R.A.R.; Phillips, R.A.; O’Connell, T.C. 2016 Drivers of intrapopulation variation in resource use in a generalist predator, the macaroni penguin. Marine Ecology Progress Series, 548. 233-247. https://doi.org/10.3354/meps11626 <https://doi.org/10.3354/meps11626> cc_by CC-BY Publication - Article PeerReviewed 2016 ftnerc https://doi.org/10.3354/meps11626 2023-02-04T19:43:14Z Intrapopulation variation in resource use occurs in many populations of generalist predators with important community and evolutionary implications. One of the hypothesised mechanisms for such widespread variation is ecological opportunity, i.e. resource availability determined by intrinsic constraints and extrinsic conditions. In this study, we combined tracking data and stable isotope analysis to examine how breeding constraints and prey conditions influenced intrapopulation variation in resource use in a generalist predator, the macaroni penguin Eudyptes chrysolophus. Isotopic variation was also examined as a function of breeding success, individual traits and individual specialisation. Variation in isotope ratios was greatest across multiple tissue types when birds were able to undertake mid-range foraging trips (i.e. during incubation and pre-moult). This variation was highly consistent between years that spanned a 3-fold difference in local prey Euphausia superba density, and was also highly consistent at the individual level between 2 years that had similar prey densities. Furthermore, by comparing our results with previous work on the same population, it appeared that a decrease in local prey availability can also increase intrapopulation variation in resource use during periods with more restricted foraging ranges (i.e. during brood-guard and crèche). This study highlights the importance of considering ecological interactions that operate on multiple spatio-temporal scales when examining the drivers of resource use in populations of generalist predators Article in Journal/Newspaper Eudyptes chrysolophus Euphausia superba Macaroni penguin Natural Environment Research Council: NERC Open Research Archive Marine Ecology Progress Series 548 233 247 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Intrapopulation variation in resource use occurs in many populations of generalist predators with important community and evolutionary implications. One of the hypothesised mechanisms for such widespread variation is ecological opportunity, i.e. resource availability determined by intrinsic constraints and extrinsic conditions. In this study, we combined tracking data and stable isotope analysis to examine how breeding constraints and prey conditions influenced intrapopulation variation in resource use in a generalist predator, the macaroni penguin Eudyptes chrysolophus. Isotopic variation was also examined as a function of breeding success, individual traits and individual specialisation. Variation in isotope ratios was greatest across multiple tissue types when birds were able to undertake mid-range foraging trips (i.e. during incubation and pre-moult). This variation was highly consistent between years that spanned a 3-fold difference in local prey Euphausia superba density, and was also highly consistent at the individual level between 2 years that had similar prey densities. Furthermore, by comparing our results with previous work on the same population, it appeared that a decrease in local prey availability can also increase intrapopulation variation in resource use during periods with more restricted foraging ranges (i.e. during brood-guard and crèche). This study highlights the importance of considering ecological interactions that operate on multiple spatio-temporal scales when examining the drivers of resource use in populations of generalist predators |
format |
Article in Journal/Newspaper |
author |
Horswill, C. Matthiopoulos, J. Ratcliffe, N. Green, J.A. Trathan, P.N. McGill, R.A.R. Phillips, R.A. O’Connell, T.C. |
spellingShingle |
Horswill, C. Matthiopoulos, J. Ratcliffe, N. Green, J.A. Trathan, P.N. McGill, R.A.R. Phillips, R.A. O’Connell, T.C. Drivers of intrapopulation variation in resource use in a generalist predator, the macaroni penguin |
author_facet |
Horswill, C. Matthiopoulos, J. Ratcliffe, N. Green, J.A. Trathan, P.N. McGill, R.A.R. Phillips, R.A. O’Connell, T.C. |
author_sort |
Horswill, C. |
title |
Drivers of intrapopulation variation in resource use in a generalist predator, the macaroni penguin |
title_short |
Drivers of intrapopulation variation in resource use in a generalist predator, the macaroni penguin |
title_full |
Drivers of intrapopulation variation in resource use in a generalist predator, the macaroni penguin |
title_fullStr |
Drivers of intrapopulation variation in resource use in a generalist predator, the macaroni penguin |
title_full_unstemmed |
Drivers of intrapopulation variation in resource use in a generalist predator, the macaroni penguin |
title_sort |
drivers of intrapopulation variation in resource use in a generalist predator, the macaroni penguin |
publisher |
Inter-Research |
publishDate |
2016 |
url |
http://nora.nerc.ac.uk/id/eprint/513917/ https://nora.nerc.ac.uk/id/eprint/513917/1/m548p233.pdf https://doi.org/10.3354/meps11626 |
genre |
Eudyptes chrysolophus Euphausia superba Macaroni penguin |
genre_facet |
Eudyptes chrysolophus Euphausia superba Macaroni penguin |
op_relation |
https://nora.nerc.ac.uk/id/eprint/513917/1/m548p233.pdf Horswill, C. orcid:0000-0002-1795-0753 Matthiopoulos, J.; Ratcliffe, N. orcid:0000-0002-3375-2431 Green, J.A.; Trathan, P.N. orcid:0000-0001-6673-9930 McGill, R.A.R.; Phillips, R.A.; O’Connell, T.C. 2016 Drivers of intrapopulation variation in resource use in a generalist predator, the macaroni penguin. Marine Ecology Progress Series, 548. 233-247. https://doi.org/10.3354/meps11626 <https://doi.org/10.3354/meps11626> |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3354/meps11626 |
container_title |
Marine Ecology Progress Series |
container_volume |
548 |
container_start_page |
233 |
op_container_end_page |
247 |
_version_ |
1766404430161248256 |