Data from: Inter-annual variability and long-term trends in breeding success in a declining population of migratory swans
Population declines among migratory Arctic-breeding birds are a growing concern for conservationists. To inform the conservation of these declining populations, we need to understand how demographic rates such as breeding success are influenced by combinations of extrinsic and intrinsic factors. In...
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ftdans:oai:easy.dans.knaw.nl:easy-dataset:92471 2023-07-02T03:30:57+02:00 Data from: Inter-annual variability and long-term trends in breeding success in a declining population of migratory swans Wood, Kevin A. Newth, Julia L. Hilton, Geoff M. Nolet, Bart A. Rees, Eileen C. 2016-01-21T15:29:55.000+01:00 http://nbn-resolving.org/urn:nbn:nl:ui:13-0e-4dnb https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:92471 unknown doi:10.5061/dryad.65k7g/1 doi:10.1111/jav.00819 http://nbn-resolving.org/urn:nbn:nl:ui:13-0e-4dnb doi:10.5061/dryad.65k7g https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:92471 OPEN_ACCESS: The data are archived in Easy, they are accessible elsewhere through the DOI https://dans.knaw.nl/en/about/organisation-and-policy/legal-information/DANSLicence.pdf Life sciences medicine and health care 2016 ftdans https://doi.org/10.5061/dryad.65k7g/110.1111/jav.0081910.5061/dryad.65k7g 2023-06-13T12:49:49Z Population declines among migratory Arctic-breeding birds are a growing concern for conservationists. To inform the conservation of these declining populations, we need to understand how demographic rates such as breeding success are influenced by combinations of extrinsic and intrinsic factors. In this study we examined inter-annual variation and long-term trends in two aspects of the breeding success of a migratory herbivore, the Bewick's swan Cygnus columbianus bewickii, which is currently undergoing a population decline: 1) the percentage of young within the wintering population and 2) mean brood size. We used an information-theoretic approach to test how these two measures of productivity were influenced over a 26 yr period by 12 potential explanatory variables, encompassing both environmental (e.g. temperature) and intrinsic (e.g. pair-bond duration) factors. Swan productivity exhibited sensitivity to both types of explanatory variable. Fewer young were observed on the wintering grounds in years in which the breeding period (May to September) was colder and predator (Arctic fox) abundance was higher. The percentage of young within the wintering population also showed negative density-dependence. Inter-annual variance in mean swan brood size was best explained by a model comprised of the negative degree days during the swan breeding period, mean pair-bond duration of all paired swans (i.e. mean pair duration), and an interaction between these two variables. In particular, mean pair duration had a strong positive effect on mean brood size. However, we found no long-term directional trend in either measure of breeding success, despite the recent decline in the NW European population. Our results highlight that inter-annual variability in breeding success is sensitive to the combined effects of both intrinsic and extrinsic factors. Other/Unknown Material Arctic Fox Arctic Cygnus columbianus Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen) Arctic |
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Open Polar |
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Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen) |
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ftdans |
language |
unknown |
topic |
Life sciences medicine and health care |
spellingShingle |
Life sciences medicine and health care Wood, Kevin A. Newth, Julia L. Hilton, Geoff M. Nolet, Bart A. Rees, Eileen C. Data from: Inter-annual variability and long-term trends in breeding success in a declining population of migratory swans |
topic_facet |
Life sciences medicine and health care |
description |
Population declines among migratory Arctic-breeding birds are a growing concern for conservationists. To inform the conservation of these declining populations, we need to understand how demographic rates such as breeding success are influenced by combinations of extrinsic and intrinsic factors. In this study we examined inter-annual variation and long-term trends in two aspects of the breeding success of a migratory herbivore, the Bewick's swan Cygnus columbianus bewickii, which is currently undergoing a population decline: 1) the percentage of young within the wintering population and 2) mean brood size. We used an information-theoretic approach to test how these two measures of productivity were influenced over a 26 yr period by 12 potential explanatory variables, encompassing both environmental (e.g. temperature) and intrinsic (e.g. pair-bond duration) factors. Swan productivity exhibited sensitivity to both types of explanatory variable. Fewer young were observed on the wintering grounds in years in which the breeding period (May to September) was colder and predator (Arctic fox) abundance was higher. The percentage of young within the wintering population also showed negative density-dependence. Inter-annual variance in mean swan brood size was best explained by a model comprised of the negative degree days during the swan breeding period, mean pair-bond duration of all paired swans (i.e. mean pair duration), and an interaction between these two variables. In particular, mean pair duration had a strong positive effect on mean brood size. However, we found no long-term directional trend in either measure of breeding success, despite the recent decline in the NW European population. Our results highlight that inter-annual variability in breeding success is sensitive to the combined effects of both intrinsic and extrinsic factors. |
author |
Wood, Kevin A. Newth, Julia L. Hilton, Geoff M. Nolet, Bart A. Rees, Eileen C. |
author_facet |
Wood, Kevin A. Newth, Julia L. Hilton, Geoff M. Nolet, Bart A. Rees, Eileen C. |
author_sort |
Wood, Kevin A. |
title |
Data from: Inter-annual variability and long-term trends in breeding success in a declining population of migratory swans |
title_short |
Data from: Inter-annual variability and long-term trends in breeding success in a declining population of migratory swans |
title_full |
Data from: Inter-annual variability and long-term trends in breeding success in a declining population of migratory swans |
title_fullStr |
Data from: Inter-annual variability and long-term trends in breeding success in a declining population of migratory swans |
title_full_unstemmed |
Data from: Inter-annual variability and long-term trends in breeding success in a declining population of migratory swans |
title_sort |
data from: inter-annual variability and long-term trends in breeding success in a declining population of migratory swans |
publishDate |
2016 |
url |
http://nbn-resolving.org/urn:nbn:nl:ui:13-0e-4dnb https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:92471 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Fox Arctic Cygnus columbianus |
genre_facet |
Arctic Fox Arctic Cygnus columbianus |
op_relation |
doi:10.5061/dryad.65k7g/1 doi:10.1111/jav.00819 http://nbn-resolving.org/urn:nbn:nl:ui:13-0e-4dnb doi:10.5061/dryad.65k7g https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:92471 |
op_rights |
OPEN_ACCESS: The data are archived in Easy, they are accessible elsewhere through the DOI https://dans.knaw.nl/en/about/organisation-and-policy/legal-information/DANSLicence.pdf |
op_doi |
https://doi.org/10.5061/dryad.65k7g/110.1111/jav.0081910.5061/dryad.65k7g |
_version_ |
1770275211761942528 |