Can macaroni penguins keep up with climate- and fishing-induced changes in krill?
Macaroni penguins have evolved to cope with the highly variable conditions of the Southern Ocean. However, changes in prey supply and patchiness potentially associated with changes in climate and krill fishing activity may be occurring too rapidly for the penguins to adapt. We use a stochastic dynam...
Published in: | Polar Biology |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer-Verlag
2008
|
Subjects: | |
Online Access: | https://doi.org/10.1007/s00300-007-0401-0 http://ecite.utas.edu.au/131152 |
id |
ftunivtasecite:oai:ecite.utas.edu.au:131152 |
---|---|
record_format |
openpolar |
spelling |
ftunivtasecite:oai:ecite.utas.edu.au:131152 2023-05-15T18:02:01+02:00 Can macaroni penguins keep up with climate- and fishing-induced changes in krill? Cresswell, KA Wiedenmann, J Mangel, M 2008 https://doi.org/10.1007/s00300-007-0401-0 http://ecite.utas.edu.au/131152 en eng Springer-Verlag http://dx.doi.org/10.1007/s00300-007-0401-0 Cresswell, KA and Wiedenmann, J and Mangel, M, Can macaroni penguins keep up with climate- and fishing-induced changes in krill?, Polar Biology, 31, (5) pp. 641-649. ISSN 0722-4060 (2008) [Refereed Article] http://ecite.utas.edu.au/131152 Biological Sciences Evolutionary Biology Evolutionary Impacts of Climate Change Refereed Article PeerReviewed 2008 ftunivtasecite https://doi.org/10.1007/s00300-007-0401-0 2019-12-13T22:29:08Z Macaroni penguins have evolved to cope with the highly variable conditions of the Southern Ocean. However, changes in prey supply and patchiness potentially associated with changes in climate and krill fishing activity may be occurring too rapidly for the penguins to adapt. We use a stochastic dynamic programming model to examine how changes in both the mean and patchiness of krill supply may affect the foraging decisions, and therefore breeding success, of female macaroni penguins at South Georgia. We predict that rapid changes in the mean supply of prey will have more of an effect on the condition of the female and chick than changes in prey patchiness, and that changes in foraging behavior compensate for changes in prey up to a threshold point, beyond which breeding success is likely impacted. In particular, we predict that the location of the threshold is affected by whether or not the penguins are adapted to the prey environment in which they are foraging, with the female and chick receiving on average 20% less of their daily energetic requirement if the female is not foraging optimally. Article in Journal/Newspaper Polar Biology Southern Ocean eCite UTAS (University of Tasmania) Southern Ocean Polar Biology 31 5 641 649 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Evolutionary Biology Evolutionary Impacts of Climate Change |
spellingShingle |
Biological Sciences Evolutionary Biology Evolutionary Impacts of Climate Change Cresswell, KA Wiedenmann, J Mangel, M Can macaroni penguins keep up with climate- and fishing-induced changes in krill? |
topic_facet |
Biological Sciences Evolutionary Biology Evolutionary Impacts of Climate Change |
description |
Macaroni penguins have evolved to cope with the highly variable conditions of the Southern Ocean. However, changes in prey supply and patchiness potentially associated with changes in climate and krill fishing activity may be occurring too rapidly for the penguins to adapt. We use a stochastic dynamic programming model to examine how changes in both the mean and patchiness of krill supply may affect the foraging decisions, and therefore breeding success, of female macaroni penguins at South Georgia. We predict that rapid changes in the mean supply of prey will have more of an effect on the condition of the female and chick than changes in prey patchiness, and that changes in foraging behavior compensate for changes in prey up to a threshold point, beyond which breeding success is likely impacted. In particular, we predict that the location of the threshold is affected by whether or not the penguins are adapted to the prey environment in which they are foraging, with the female and chick receiving on average 20% less of their daily energetic requirement if the female is not foraging optimally. |
format |
Article in Journal/Newspaper |
author |
Cresswell, KA Wiedenmann, J Mangel, M |
author_facet |
Cresswell, KA Wiedenmann, J Mangel, M |
author_sort |
Cresswell, KA |
title |
Can macaroni penguins keep up with climate- and fishing-induced changes in krill? |
title_short |
Can macaroni penguins keep up with climate- and fishing-induced changes in krill? |
title_full |
Can macaroni penguins keep up with climate- and fishing-induced changes in krill? |
title_fullStr |
Can macaroni penguins keep up with climate- and fishing-induced changes in krill? |
title_full_unstemmed |
Can macaroni penguins keep up with climate- and fishing-induced changes in krill? |
title_sort |
can macaroni penguins keep up with climate- and fishing-induced changes in krill? |
publisher |
Springer-Verlag |
publishDate |
2008 |
url |
https://doi.org/10.1007/s00300-007-0401-0 http://ecite.utas.edu.au/131152 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Polar Biology Southern Ocean |
genre_facet |
Polar Biology Southern Ocean |
op_relation |
http://dx.doi.org/10.1007/s00300-007-0401-0 Cresswell, KA and Wiedenmann, J and Mangel, M, Can macaroni penguins keep up with climate- and fishing-induced changes in krill?, Polar Biology, 31, (5) pp. 641-649. ISSN 0722-4060 (2008) [Refereed Article] http://ecite.utas.edu.au/131152 |
op_doi |
https://doi.org/10.1007/s00300-007-0401-0 |
container_title |
Polar Biology |
container_volume |
31 |
container_issue |
5 |
container_start_page |
641 |
op_container_end_page |
649 |
_version_ |
1766171661170638848 |