When and where to count? Implications of migratory connectivity and nonbreeding distribution to population censuses in a migratory bird population
Abstract Migratory connectivity is a metric of the co‐occurrence of migratory animals originating from different breeding sites, and like their spatial dispersion, can vary substantially during the annual cycle. Together, both these properties affect the optimal times and sites of population censusi...
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Online Access: | http://dx.doi.org/10.1002/1438-390x.12143 https://onlinelibrary.wiley.com/doi/pdf/10.1002/1438-390X.12143 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/1438-390X.12143 |
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crwiley:10.1002/1438-390x.12143 2024-09-09T19:01:12+00:00 When and where to count? Implications of migratory connectivity and nonbreeding distribution to population censuses in a migratory bird population Piironen, Antti Fox, Anthony D. Kampe‐Persson, Hakon Skyllberg, Ulf Therkildsen, Ole Roland Laaksonen, Toni Svenska Jägareförbundet Naturvårdsverket 2022 http://dx.doi.org/10.1002/1438-390x.12143 https://onlinelibrary.wiley.com/doi/pdf/10.1002/1438-390X.12143 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/1438-390X.12143 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Population Ecology volume 65, issue 2, page 121-132 ISSN 1438-3896 1438-390X journal-article 2022 crwiley https://doi.org/10.1002/1438-390x.12143 2024-08-20T04:15:18Z Abstract Migratory connectivity is a metric of the co‐occurrence of migratory animals originating from different breeding sites, and like their spatial dispersion, can vary substantially during the annual cycle. Together, both these properties affect the optimal times and sites of population censusing. We tracked taiga bean geese ( Anser fabalis fabalis ) during 2014–2021 to study their migratory connectivity and nonbreeding movements and determine optimal periods to assess the size of their main flyway population. We also compared available census data with tracking data, to examine how well two existing censuses covered the population. Daily Mantel's correlation between breeding and nonbreeding sites lay between 0 and 0.5 during most of the nonbreeding season, implying birds from different breeding areas were not strongly separated at other times in the annual cycle. However, the connectivity was higher among birds from the westernmost breeding areas compared to the birds breeding elsewhere. Daily Minimum Convex Polygons showed tracked birds were highly aggregated at census times, confirming their utility. The number of tracked birds absent at count sites during the censuses however exceeded numbers double‐counted at several sites, indicating that censuses might have underestimated the true population size. Our results show that connectivity can vary in different times during the nonbreeding period, and should be studied throughout the annual cycle. Our results also confirm previous studies, which have found that estimates using marked individuals usually produce higher population size estimates than total counts. This should be considered when using total counts to assess population sizes in the future. Article in Journal/Newspaper Anser fabalis taiga Wiley Online Library Population Ecology 65 2 121 132 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Migratory connectivity is a metric of the co‐occurrence of migratory animals originating from different breeding sites, and like their spatial dispersion, can vary substantially during the annual cycle. Together, both these properties affect the optimal times and sites of population censusing. We tracked taiga bean geese ( Anser fabalis fabalis ) during 2014–2021 to study their migratory connectivity and nonbreeding movements and determine optimal periods to assess the size of their main flyway population. We also compared available census data with tracking data, to examine how well two existing censuses covered the population. Daily Mantel's correlation between breeding and nonbreeding sites lay between 0 and 0.5 during most of the nonbreeding season, implying birds from different breeding areas were not strongly separated at other times in the annual cycle. However, the connectivity was higher among birds from the westernmost breeding areas compared to the birds breeding elsewhere. Daily Minimum Convex Polygons showed tracked birds were highly aggregated at census times, confirming their utility. The number of tracked birds absent at count sites during the censuses however exceeded numbers double‐counted at several sites, indicating that censuses might have underestimated the true population size. Our results show that connectivity can vary in different times during the nonbreeding period, and should be studied throughout the annual cycle. Our results also confirm previous studies, which have found that estimates using marked individuals usually produce higher population size estimates than total counts. This should be considered when using total counts to assess population sizes in the future. |
author2 |
Svenska Jägareförbundet Naturvårdsverket |
format |
Article in Journal/Newspaper |
author |
Piironen, Antti Fox, Anthony D. Kampe‐Persson, Hakon Skyllberg, Ulf Therkildsen, Ole Roland Laaksonen, Toni |
spellingShingle |
Piironen, Antti Fox, Anthony D. Kampe‐Persson, Hakon Skyllberg, Ulf Therkildsen, Ole Roland Laaksonen, Toni When and where to count? Implications of migratory connectivity and nonbreeding distribution to population censuses in a migratory bird population |
author_facet |
Piironen, Antti Fox, Anthony D. Kampe‐Persson, Hakon Skyllberg, Ulf Therkildsen, Ole Roland Laaksonen, Toni |
author_sort |
Piironen, Antti |
title |
When and where to count? Implications of migratory connectivity and nonbreeding distribution to population censuses in a migratory bird population |
title_short |
When and where to count? Implications of migratory connectivity and nonbreeding distribution to population censuses in a migratory bird population |
title_full |
When and where to count? Implications of migratory connectivity and nonbreeding distribution to population censuses in a migratory bird population |
title_fullStr |
When and where to count? Implications of migratory connectivity and nonbreeding distribution to population censuses in a migratory bird population |
title_full_unstemmed |
When and where to count? Implications of migratory connectivity and nonbreeding distribution to population censuses in a migratory bird population |
title_sort |
when and where to count? implications of migratory connectivity and nonbreeding distribution to population censuses in a migratory bird population |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1002/1438-390x.12143 https://onlinelibrary.wiley.com/doi/pdf/10.1002/1438-390X.12143 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/1438-390X.12143 |
genre |
Anser fabalis taiga |
genre_facet |
Anser fabalis taiga |
op_source |
Population Ecology volume 65, issue 2, page 121-132 ISSN 1438-3896 1438-390X |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/1438-390x.12143 |
container_title |
Population Ecology |
container_volume |
65 |
container_issue |
2 |
container_start_page |
121 |
op_container_end_page |
132 |
_version_ |
1809944350890655744 |