Towards integrated population monitoring based on the fieldwork of volunteer ringers: productivity, survival and population change of Tawny Owls Strix aluco and Ural Owls Strix uralensis in Finland
ABSTRACT Capsule: Monitoring of demographic parameters by volunteer ringers provides insight into the factors driving population changes in owls. Aims: To assess the value of national ringing, recapture and recovery data from volunteers to understand population dynamics. Methods: We analysed 49 year...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/303622 2024-01-07T09:46:53+01:00 Towards integrated population monitoring based on the fieldwork of volunteer ringers: productivity, survival and population change of Tawny Owls Strix aluco and Ural Owls Strix uralensis in Finland Saurola, Pertti Lauri Francis, Charles Zoology Finnish Museum of Natural History 2019-06-28T12:55:02Z 14 application/pdf http://hdl.handle.net/10138/303622 eng eng Taylor & Francis 10.1080/00063657.2018.1481364 Saurola , P L & Francis , C 2018 , ' Towards integrated population monitoring based on the fieldwork of volunteer ringers: productivity, survival and population change of Tawny Owls Strix aluco and Ural Owls Strix uralensis in Finland ' , Bird Study , vol. 65 , no. supplement 1 , pp. S63-S76 . https://doi.org/10.1080/00063657.2018.1481364 ORCID: /0000-0002-8468-9751/work/58958477 85048759576 b7858347-077b-4d1f-bbea-a7625cf74474 http://hdl.handle.net/10138/303622 000578992900008 cc_by openAccess info:eu-repo/semantics/openAccess 1181 Ecology evolutionary biology Article publishedVersion 2019 ftunivhelsihelda 2023-12-14T00:07:16Z ABSTRACT Capsule: Monitoring of demographic parameters by volunteer ringers provides insight into the factors driving population changes in owls. Aims: To assess the value of national ringing, recapture and recovery data from volunteers to understand population dynamics. Methods: We analysed 49 years of ringing, recapture and recovery data from throughout Finland for Tawny Owls Strix aluco and Ural Owls Strix uralensis and compared them with annual population and productivity indices from other volunteer-based surveys. Results: Volunteer-based ringing data show that all aspects of the demography of Ural and Tawny Owls fluctuate dramatically in relation to an approximately three-year cycle of voles. When voles are abundant, a high proportion of owls breed and many young are produced; however, few of those young survive because vole populations crash the following winter. Survival of adults fluctuates less than that of young, suggesting that adults are better able to survive on alternative prey. In 2005, when vole populations remained high two years in row, many young were produced and survived, leading to a peak in owl breeding populations four years later at the top of the next vole cycle. This was immediately followed by a crash in populations suggesting a densitydependent interaction with vole abundance. Changing climate could affect owls both directly, by influencing winter survival, as well as indirectly through impacting prey availability. Conclusion: Encouraging similar, volunteer-based national-scale ringing efforts for owls elsewhere in Europe, especially for Tawny Owls which occur in most countries, would be a cost-effective way to understand how factors such as changing prey availability, climate and habitat availability are influencing the population levels of this and other raptors. Peer reviewed Article in Journal/Newspaper Strix uralensis HELDA – University of Helsinki Open Repository Bird Study 65 sup1 S63 S76 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
1181 Ecology evolutionary biology |
spellingShingle |
1181 Ecology evolutionary biology Saurola, Pertti Lauri Francis, Charles Towards integrated population monitoring based on the fieldwork of volunteer ringers: productivity, survival and population change of Tawny Owls Strix aluco and Ural Owls Strix uralensis in Finland |
topic_facet |
1181 Ecology evolutionary biology |
description |
ABSTRACT Capsule: Monitoring of demographic parameters by volunteer ringers provides insight into the factors driving population changes in owls. Aims: To assess the value of national ringing, recapture and recovery data from volunteers to understand population dynamics. Methods: We analysed 49 years of ringing, recapture and recovery data from throughout Finland for Tawny Owls Strix aluco and Ural Owls Strix uralensis and compared them with annual population and productivity indices from other volunteer-based surveys. Results: Volunteer-based ringing data show that all aspects of the demography of Ural and Tawny Owls fluctuate dramatically in relation to an approximately three-year cycle of voles. When voles are abundant, a high proportion of owls breed and many young are produced; however, few of those young survive because vole populations crash the following winter. Survival of adults fluctuates less than that of young, suggesting that adults are better able to survive on alternative prey. In 2005, when vole populations remained high two years in row, many young were produced and survived, leading to a peak in owl breeding populations four years later at the top of the next vole cycle. This was immediately followed by a crash in populations suggesting a densitydependent interaction with vole abundance. Changing climate could affect owls both directly, by influencing winter survival, as well as indirectly through impacting prey availability. Conclusion: Encouraging similar, volunteer-based national-scale ringing efforts for owls elsewhere in Europe, especially for Tawny Owls which occur in most countries, would be a cost-effective way to understand how factors such as changing prey availability, climate and habitat availability are influencing the population levels of this and other raptors. Peer reviewed |
author2 |
Zoology Finnish Museum of Natural History |
format |
Article in Journal/Newspaper |
author |
Saurola, Pertti Lauri Francis, Charles |
author_facet |
Saurola, Pertti Lauri Francis, Charles |
author_sort |
Saurola, Pertti Lauri |
title |
Towards integrated population monitoring based on the fieldwork of volunteer ringers: productivity, survival and population change of Tawny Owls Strix aluco and Ural Owls Strix uralensis in Finland |
title_short |
Towards integrated population monitoring based on the fieldwork of volunteer ringers: productivity, survival and population change of Tawny Owls Strix aluco and Ural Owls Strix uralensis in Finland |
title_full |
Towards integrated population monitoring based on the fieldwork of volunteer ringers: productivity, survival and population change of Tawny Owls Strix aluco and Ural Owls Strix uralensis in Finland |
title_fullStr |
Towards integrated population monitoring based on the fieldwork of volunteer ringers: productivity, survival and population change of Tawny Owls Strix aluco and Ural Owls Strix uralensis in Finland |
title_full_unstemmed |
Towards integrated population monitoring based on the fieldwork of volunteer ringers: productivity, survival and population change of Tawny Owls Strix aluco and Ural Owls Strix uralensis in Finland |
title_sort |
towards integrated population monitoring based on the fieldwork of volunteer ringers: productivity, survival and population change of tawny owls strix aluco and ural owls strix uralensis in finland |
publisher |
Taylor & Francis |
publishDate |
2019 |
url |
http://hdl.handle.net/10138/303622 |
genre |
Strix uralensis |
genre_facet |
Strix uralensis |
op_relation |
10.1080/00063657.2018.1481364 Saurola , P L & Francis , C 2018 , ' Towards integrated population monitoring based on the fieldwork of volunteer ringers: productivity, survival and population change of Tawny Owls Strix aluco and Ural Owls Strix uralensis in Finland ' , Bird Study , vol. 65 , no. supplement 1 , pp. S63-S76 . https://doi.org/10.1080/00063657.2018.1481364 ORCID: /0000-0002-8468-9751/work/58958477 85048759576 b7858347-077b-4d1f-bbea-a7625cf74474 http://hdl.handle.net/10138/303622 000578992900008 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
container_title |
Bird Study |
container_volume |
65 |
container_issue |
sup1 |
container_start_page |
S63 |
op_container_end_page |
S76 |
_version_ |
1787428803764551680 |