Population estimates and geographical distributions of swans and geese in East Asia based on counts during the non-breeding season
For the first time, we estimated the population sizes of two swan species and four goose species from observations during the non-breeding period in East Asia. Based on combined counts from South Korea, Japan and China, we estimated the total abundance of these species as follows: 42,000–47,000 Whoo...
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ftuniaarhuspubl:oai:pure.atira.dk:publications/d71c7640-9719-40be-a11c-6885af1ddd05 2023-12-24T10:16:09+01:00 Population estimates and geographical distributions of swans and geese in East Asia based on counts during the non-breeding season Jia, Qiang Koyama, Kazuo Choi, Chang-Yong Kim, Hwa-Jung Cao, Lei Gao, Dali Liu, Guanhua Fox, Anthony David 2016-11-24 https://pure.au.dk/portal/da/publications/population-estimates-and-geographical-distributions-of-swans-and-geese-in-east-asia-based-on-counts-during-the-nonbreeding-season(d71c7640-9719-40be-a11c-6885af1ddd05).html eng eng https://pure.au.dk/portal/da/publications/population-estimates-and-geographical-distributions-of-swans-and-geese-in-east-asia-based-on-counts-during-the-nonbreeding-season(d71c7640-9719-40be-a11c-6885af1ddd05).html info:eu-repo/semantics/restrictedAccess Jia , Q , Koyama , K , Choi , C-Y , Kim , H-J , Cao , L , Gao , D , Liu , G & Fox , A D 2016 , ' Population estimates and geographical distributions of swans and geese in East Asia based on counts during the non-breeding season ' , Bird Conservation International , vol. 26 , pp. 397-417 . article 2016 ftuniaarhuspubl 2023-11-29T23:59:28Z For the first time, we estimated the population sizes of two swan species and four goose species from observations during the non-breeding period in East Asia. Based on combined counts from South Korea, Japan and China, we estimated the total abundance of these species as follows: 42,000–47,000 Whooper Swans Cygnus cygnus 99,000–141,000 Tundra Swans C. columbianus bewickii 56,000–98,000 Swan Geese Anser cygnoides 157,000–194,000 Bean Geese A. fabalis 231,000–283,000 Greater White-fronted Geese A. albifrons and 14,000–19,000 Lesser White-fronted Geese A. erythropus . While the count data from Korea and Japan provide a good reflection of numbers present, there remain gaps in the coverage in China, which particularly affect the precision of the estimates for Bean, Greater and Lesser White-fronted Geese as well as Tundra Swans. Lack of subspecies distinction of Bean Geese in China until recently also limits our ability to determine the true status of A. f. middendorffii there, but all indications suggest this population numbers around 18,000 individuals and is in need of urgent attention. The small, highly concentrated and declining numbers of Lesser White-fronted Geese give concern for this species, as do the major declines in Greater White-fronted Geese in China (in contrast to numbers in Japan and Korea, considered to be a separate flyway). In the absence of any demographic data, it is impossible to interpret the causes of these changes in abundance. Improved monitoring, including demographic and tracking studies are required to provide the necessary information to retain populations in favourable conservation status. Article in Journal/Newspaper Cygnus cygnus Tundra Aarhus University: Research |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
description |
For the first time, we estimated the population sizes of two swan species and four goose species from observations during the non-breeding period in East Asia. Based on combined counts from South Korea, Japan and China, we estimated the total abundance of these species as follows: 42,000–47,000 Whooper Swans Cygnus cygnus 99,000–141,000 Tundra Swans C. columbianus bewickii 56,000–98,000 Swan Geese Anser cygnoides 157,000–194,000 Bean Geese A. fabalis 231,000–283,000 Greater White-fronted Geese A. albifrons and 14,000–19,000 Lesser White-fronted Geese A. erythropus . While the count data from Korea and Japan provide a good reflection of numbers present, there remain gaps in the coverage in China, which particularly affect the precision of the estimates for Bean, Greater and Lesser White-fronted Geese as well as Tundra Swans. Lack of subspecies distinction of Bean Geese in China until recently also limits our ability to determine the true status of A. f. middendorffii there, but all indications suggest this population numbers around 18,000 individuals and is in need of urgent attention. The small, highly concentrated and declining numbers of Lesser White-fronted Geese give concern for this species, as do the major declines in Greater White-fronted Geese in China (in contrast to numbers in Japan and Korea, considered to be a separate flyway). In the absence of any demographic data, it is impossible to interpret the causes of these changes in abundance. Improved monitoring, including demographic and tracking studies are required to provide the necessary information to retain populations in favourable conservation status. |
format |
Article in Journal/Newspaper |
author |
Jia, Qiang Koyama, Kazuo Choi, Chang-Yong Kim, Hwa-Jung Cao, Lei Gao, Dali Liu, Guanhua Fox, Anthony David |
spellingShingle |
Jia, Qiang Koyama, Kazuo Choi, Chang-Yong Kim, Hwa-Jung Cao, Lei Gao, Dali Liu, Guanhua Fox, Anthony David Population estimates and geographical distributions of swans and geese in East Asia based on counts during the non-breeding season |
author_facet |
Jia, Qiang Koyama, Kazuo Choi, Chang-Yong Kim, Hwa-Jung Cao, Lei Gao, Dali Liu, Guanhua Fox, Anthony David |
author_sort |
Jia, Qiang |
title |
Population estimates and geographical distributions of swans and geese in East Asia based on counts during the non-breeding season |
title_short |
Population estimates and geographical distributions of swans and geese in East Asia based on counts during the non-breeding season |
title_full |
Population estimates and geographical distributions of swans and geese in East Asia based on counts during the non-breeding season |
title_fullStr |
Population estimates and geographical distributions of swans and geese in East Asia based on counts during the non-breeding season |
title_full_unstemmed |
Population estimates and geographical distributions of swans and geese in East Asia based on counts during the non-breeding season |
title_sort |
population estimates and geographical distributions of swans and geese in east asia based on counts during the non-breeding season |
publishDate |
2016 |
url |
https://pure.au.dk/portal/da/publications/population-estimates-and-geographical-distributions-of-swans-and-geese-in-east-asia-based-on-counts-during-the-nonbreeding-season(d71c7640-9719-40be-a11c-6885af1ddd05).html |
genre |
Cygnus cygnus Tundra |
genre_facet |
Cygnus cygnus Tundra |
op_source |
Jia , Q , Koyama , K , Choi , C-Y , Kim , H-J , Cao , L , Gao , D , Liu , G & Fox , A D 2016 , ' Population estimates and geographical distributions of swans and geese in East Asia based on counts during the non-breeding season ' , Bird Conservation International , vol. 26 , pp. 397-417 . |
op_relation |
https://pure.au.dk/portal/da/publications/population-estimates-and-geographical-distributions-of-swans-and-geese-in-east-asia-based-on-counts-during-the-nonbreeding-season(d71c7640-9719-40be-a11c-6885af1ddd05).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1786203487178063872 |