Effects of variability in prey abundance on reproduction and foraging in chinstrap penguins ( Pygoscelis antarctica)
Abstract Life‐history theory predicts that adults of long‐lived species such as seabirds should optimally balance investment in current and future offspring. However, when trying to optimize investment in offspring provisioning, the most energetically costly component of seabird parental care, adult...
Published in: | Journal of Zoology |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2006
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/j.1469-7998.2006.00090.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.2006.00090.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.2006.00090.x https://onlinelibrary.wiley.com/doi/full-xml/10.1111/j.1469-7998.2006.00090.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.2006.00090.x |
id |
crwiley:10.1111/j.1469-7998.2006.00090.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/j.1469-7998.2006.00090.x 2024-06-02T07:57:29+00:00 Effects of variability in prey abundance on reproduction and foraging in chinstrap penguins ( Pygoscelis antarctica) Croll, D. A. Demer, D. A. Hewitt, R. P. Jansen, J. K. Goebel, M. E. Tershy, B. R. 2006 http://dx.doi.org/10.1111/j.1469-7998.2006.00090.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.2006.00090.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.2006.00090.x https://onlinelibrary.wiley.com/doi/full-xml/10.1111/j.1469-7998.2006.00090.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.2006.00090.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Zoology volume 269, issue 4, page 506-513 ISSN 0952-8369 1469-7998 journal-article 2006 crwiley https://doi.org/10.1111/j.1469-7998.2006.00090.x 2024-05-03T11:13:52Z Abstract Life‐history theory predicts that adults of long‐lived species such as seabirds should optimally balance investment in current and future offspring. However, when trying to optimize investment in offspring provisioning, the most energetically costly component of seabird parental care, adults need to contend with large interannual fluctuations in prey availability and hence the cost of chick provisioning. Adults faced with this uncertainty can mechanistically balance parental care by adopting a strategy somewhere along the continuum between maintaining constant investment in foraging effort between years and letting chick provisioning fluctuate or holding chick provisioning constant and varying investment in foraging effort. Using ship‐based hydroacoustic assessment of prey, time‐depth recorders attached to penguins and land‐based observations at the breeding colony, we examined how foraging and reproductive effort in breeding chinstrap penguins Pygoscelis antarctica responded to interannual variation in the abundance of Antarctic krill Euphausia superba in the vicinity of Seal Island, South Shetland Islands, 1990–1992. Regional measures of krill density varied by a factor of 2.5 (47.0, 23.8 and 61.2 g m −2 in 1990, 1991 and 1992, respectively) and was correlated with annual measures of breeding adult body weight and reproductive performance (breeding population size, duration of chick rearing, chick growth, breeding success and fledgling weight). In contrast, measures of penguin foraging effort (dive depth, dive duration, number of trips day −1 , trip duration, number of dives trip −1 and dive rate) did not differ between years. We conclude that chinstrap penguins reduce reproductive success rather than increase foraging effort in response to decreases in prey abundance in a manner consistent with predictions of life‐history strategies for long‐lived seabirds. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctica Euphausia superba Pygoscelis antarctica South Shetland Islands Seal Island Wiley Online Library Antarctic South Shetland Islands Journal of Zoology 269 4 506 513 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Life‐history theory predicts that adults of long‐lived species such as seabirds should optimally balance investment in current and future offspring. However, when trying to optimize investment in offspring provisioning, the most energetically costly component of seabird parental care, adults need to contend with large interannual fluctuations in prey availability and hence the cost of chick provisioning. Adults faced with this uncertainty can mechanistically balance parental care by adopting a strategy somewhere along the continuum between maintaining constant investment in foraging effort between years and letting chick provisioning fluctuate or holding chick provisioning constant and varying investment in foraging effort. Using ship‐based hydroacoustic assessment of prey, time‐depth recorders attached to penguins and land‐based observations at the breeding colony, we examined how foraging and reproductive effort in breeding chinstrap penguins Pygoscelis antarctica responded to interannual variation in the abundance of Antarctic krill Euphausia superba in the vicinity of Seal Island, South Shetland Islands, 1990–1992. Regional measures of krill density varied by a factor of 2.5 (47.0, 23.8 and 61.2 g m −2 in 1990, 1991 and 1992, respectively) and was correlated with annual measures of breeding adult body weight and reproductive performance (breeding population size, duration of chick rearing, chick growth, breeding success and fledgling weight). In contrast, measures of penguin foraging effort (dive depth, dive duration, number of trips day −1 , trip duration, number of dives trip −1 and dive rate) did not differ between years. We conclude that chinstrap penguins reduce reproductive success rather than increase foraging effort in response to decreases in prey abundance in a manner consistent with predictions of life‐history strategies for long‐lived seabirds. |
format |
Article in Journal/Newspaper |
author |
Croll, D. A. Demer, D. A. Hewitt, R. P. Jansen, J. K. Goebel, M. E. Tershy, B. R. |
spellingShingle |
Croll, D. A. Demer, D. A. Hewitt, R. P. Jansen, J. K. Goebel, M. E. Tershy, B. R. Effects of variability in prey abundance on reproduction and foraging in chinstrap penguins ( Pygoscelis antarctica) |
author_facet |
Croll, D. A. Demer, D. A. Hewitt, R. P. Jansen, J. K. Goebel, M. E. Tershy, B. R. |
author_sort |
Croll, D. A. |
title |
Effects of variability in prey abundance on reproduction and foraging in chinstrap penguins ( Pygoscelis antarctica) |
title_short |
Effects of variability in prey abundance on reproduction and foraging in chinstrap penguins ( Pygoscelis antarctica) |
title_full |
Effects of variability in prey abundance on reproduction and foraging in chinstrap penguins ( Pygoscelis antarctica) |
title_fullStr |
Effects of variability in prey abundance on reproduction and foraging in chinstrap penguins ( Pygoscelis antarctica) |
title_full_unstemmed |
Effects of variability in prey abundance on reproduction and foraging in chinstrap penguins ( Pygoscelis antarctica) |
title_sort |
effects of variability in prey abundance on reproduction and foraging in chinstrap penguins ( pygoscelis antarctica) |
publisher |
Wiley |
publishDate |
2006 |
url |
http://dx.doi.org/10.1111/j.1469-7998.2006.00090.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.2006.00090.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.2006.00090.x https://onlinelibrary.wiley.com/doi/full-xml/10.1111/j.1469-7998.2006.00090.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.2006.00090.x |
geographic |
Antarctic South Shetland Islands |
geographic_facet |
Antarctic South Shetland Islands |
genre |
Antarc* Antarctic Antarctic Krill Antarctica Euphausia superba Pygoscelis antarctica South Shetland Islands Seal Island |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica Euphausia superba Pygoscelis antarctica South Shetland Islands Seal Island |
op_source |
Journal of Zoology volume 269, issue 4, page 506-513 ISSN 0952-8369 1469-7998 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1469-7998.2006.00090.x |
container_title |
Journal of Zoology |
container_volume |
269 |
container_issue |
4 |
container_start_page |
506 |
op_container_end_page |
513 |
_version_ |
1800740638972444672 |