Parental allocation of additional food to own health and offspring growth in a variable environment
Life-history theory predicts increased investment in current reproduction when future reproduction is uncertain and a more balanced investment in current and future reproduction when prospects for both are good. The outcome of the balance in parental allocation depends on which life-history componen...
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2009
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Online Access: | http://dx.doi.org/10.1139/z08-133 http://www.nrcresearchpress.com/doi/full-xml/10.1139/Z08-133 http://www.nrcresearchpress.com/doi/pdf/10.1139/Z08-133 |
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crcansciencepubl:10.1139/z08-133 2024-04-07T07:56:04+00:00 Parental allocation of additional food to own health and offspring growth in a variable environment Karell, Patrik Pietiäinen, Hannu Siitari, Heli Pihlaja, Tuomo Kontiainen, Pekka Brommer, Jon E. 2009 http://dx.doi.org/10.1139/z08-133 http://www.nrcresearchpress.com/doi/full-xml/10.1139/Z08-133 http://www.nrcresearchpress.com/doi/pdf/10.1139/Z08-133 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 87, issue 1, page 8-19 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2009 crcansciencepubl https://doi.org/10.1139/z08-133 2024-03-08T00:37:42Z Life-history theory predicts increased investment in current reproduction when future reproduction is uncertain and a more balanced investment in current and future reproduction when prospects for both are good. The outcome of the balance in parental allocation depends on which life-history component maximizes the fitness benefits. In our study system, a 3-year vole cycle generates good prospects of current and future reproduction for Ural owls ( Strix uralensis Pallas, 1771) in increase vole phases and uncertain prospects in decrease vole phases. We supplementary-fed Ural owls during the nestling period in 2002 (an increase phase) and 2003 (a decrease phase), and measured offspring growth, parental effort, and physiological health by monitoring haematocrit, leucocyte profiles, intra- and inter-celluar blood parasites, and (in 2003) humoral antibody responsiveness. Food supplementation reduced parental feeding rate in both years, but improved a female parent’s health only in 2002 (an increase phase) and had no effects on males in either year. Nevertheless, supplementary-fed offspring reached higher asymptotic mass and fledged earlier in both years. Furthermore, early fledging reduced offspring exposure to blood-sucking black flies (Diptera, Simuliidae) in the nest. We discuss how parental allocation of resources to current and future reproduction may vary under variable food conditions. Article in Journal/Newspaper Strix uralensis Canadian Science Publishing Canadian Journal of Zoology 87 1 8 19 |
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Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Karell, Patrik Pietiäinen, Hannu Siitari, Heli Pihlaja, Tuomo Kontiainen, Pekka Brommer, Jon E. Parental allocation of additional food to own health and offspring growth in a variable environment |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Life-history theory predicts increased investment in current reproduction when future reproduction is uncertain and a more balanced investment in current and future reproduction when prospects for both are good. The outcome of the balance in parental allocation depends on which life-history component maximizes the fitness benefits. In our study system, a 3-year vole cycle generates good prospects of current and future reproduction for Ural owls ( Strix uralensis Pallas, 1771) in increase vole phases and uncertain prospects in decrease vole phases. We supplementary-fed Ural owls during the nestling period in 2002 (an increase phase) and 2003 (a decrease phase), and measured offspring growth, parental effort, and physiological health by monitoring haematocrit, leucocyte profiles, intra- and inter-celluar blood parasites, and (in 2003) humoral antibody responsiveness. Food supplementation reduced parental feeding rate in both years, but improved a female parent’s health only in 2002 (an increase phase) and had no effects on males in either year. Nevertheless, supplementary-fed offspring reached higher asymptotic mass and fledged earlier in both years. Furthermore, early fledging reduced offspring exposure to blood-sucking black flies (Diptera, Simuliidae) in the nest. We discuss how parental allocation of resources to current and future reproduction may vary under variable food conditions. |
format |
Article in Journal/Newspaper |
author |
Karell, Patrik Pietiäinen, Hannu Siitari, Heli Pihlaja, Tuomo Kontiainen, Pekka Brommer, Jon E. |
author_facet |
Karell, Patrik Pietiäinen, Hannu Siitari, Heli Pihlaja, Tuomo Kontiainen, Pekka Brommer, Jon E. |
author_sort |
Karell, Patrik |
title |
Parental allocation of additional food to own health and offspring growth in a variable environment |
title_short |
Parental allocation of additional food to own health and offspring growth in a variable environment |
title_full |
Parental allocation of additional food to own health and offspring growth in a variable environment |
title_fullStr |
Parental allocation of additional food to own health and offspring growth in a variable environment |
title_full_unstemmed |
Parental allocation of additional food to own health and offspring growth in a variable environment |
title_sort |
parental allocation of additional food to own health and offspring growth in a variable environment |
publisher |
Canadian Science Publishing |
publishDate |
2009 |
url |
http://dx.doi.org/10.1139/z08-133 http://www.nrcresearchpress.com/doi/full-xml/10.1139/Z08-133 http://www.nrcresearchpress.com/doi/pdf/10.1139/Z08-133 |
genre |
Strix uralensis |
genre_facet |
Strix uralensis |
op_source |
Canadian Journal of Zoology volume 87, issue 1, page 8-19 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z08-133 |
container_title |
Canadian Journal of Zoology |
container_volume |
87 |
container_issue |
1 |
container_start_page |
8 |
op_container_end_page |
19 |
_version_ |
1795673753507594240 |