Short-term movement patterns, population estimates and breeding biology of an island endemic bird, the Tristan Thrush
Abstract The Tristan Thrush Turdus eremita is the only land bird that survived human colonisation of the main island of Tristan da Cunha and is listed as “Near Threatened”. Population estimates are confounded by the thrushes’ inquisitive and gregarious nature as well as limited information on their...
Published in: | Revista Brasileira de Ornitologia |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer Science and Business Media LLC
2019
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1007/bf03546070 http://link.springer.com/content/pdf/10.1007/BF03546070.pdf http://link.springer.com/article/10.1007/BF03546070/fulltext.html |
id |
crspringernat:10.1007/bf03546070 |
---|---|
record_format |
openpolar |
spelling |
crspringernat:10.1007/bf03546070 2023-05-15T16:53:42+02:00 Short-term movement patterns, population estimates and breeding biology of an island endemic bird, the Tristan Thrush Ryan, Peter G. Dilley, Ben J. Davies, Delia Glass, Trevor Abadi, Fitsum 2019 http://dx.doi.org/10.1007/bf03546070 http://link.springer.com/content/pdf/10.1007/BF03546070.pdf http://link.springer.com/article/10.1007/BF03546070/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Revista Brasileira de Ornitologia volume 27, issue 4, page 245-252 ISSN 2178-7875 journal-article 2019 crspringernat https://doi.org/10.1007/bf03546070 2022-01-04T14:45:41Z Abstract The Tristan Thrush Turdus eremita is the only land bird that survived human colonisation of the main island of Tristan da Cunha and is listed as “Near Threatened”. Population estimates are confounded by the thrushes’ inquisitive and gregarious nature as well as limited information on their movements. We report the first measures of nest densities on Nightingale Island: 6 nests·ha -1 in Phylica arborea woodland and 4–5 nests·ha -1 in tussock habitat, which suggests that the population is approximately double the previous estimate. At Inaccessible Island, we individually color ringed 110 thrushes over two months to track their short-term movements and estimate the local population size. Individuals moved up to 950 m along the coast, but 96% of resightings were < 100 m. A Bayesian data augmentation approach estimated that some 260 thrushes visited the core study area, a 200-m stretch of cobble and boulder beach where birds come to drink, bathe and forage. This result suggests that the population on Inaccessible Island also is substantially larger than reported previously. We estimate the total population to be 8000–15,000 Tristan Thrushes. The main need is a population estimate for the nominate subspecies on the main island of Tristan. Article in Journal/Newspaper Inaccessible Island Springer Nature (via Crossref) Inaccessible Island ENVELOPE(166.350,166.350,-77.650,-77.650) Main Island ENVELOPE(-38.220,-38.220,-54.007,-54.007) Tristan ENVELOPE(140.900,140.900,-66.735,-66.735) Revista Brasileira de Ornitologia 27 4 245 252 |
institution |
Open Polar |
collection |
Springer Nature (via Crossref) |
op_collection_id |
crspringernat |
language |
English |
description |
Abstract The Tristan Thrush Turdus eremita is the only land bird that survived human colonisation of the main island of Tristan da Cunha and is listed as “Near Threatened”. Population estimates are confounded by the thrushes’ inquisitive and gregarious nature as well as limited information on their movements. We report the first measures of nest densities on Nightingale Island: 6 nests·ha -1 in Phylica arborea woodland and 4–5 nests·ha -1 in tussock habitat, which suggests that the population is approximately double the previous estimate. At Inaccessible Island, we individually color ringed 110 thrushes over two months to track their short-term movements and estimate the local population size. Individuals moved up to 950 m along the coast, but 96% of resightings were < 100 m. A Bayesian data augmentation approach estimated that some 260 thrushes visited the core study area, a 200-m stretch of cobble and boulder beach where birds come to drink, bathe and forage. This result suggests that the population on Inaccessible Island also is substantially larger than reported previously. We estimate the total population to be 8000–15,000 Tristan Thrushes. The main need is a population estimate for the nominate subspecies on the main island of Tristan. |
format |
Article in Journal/Newspaper |
author |
Ryan, Peter G. Dilley, Ben J. Davies, Delia Glass, Trevor Abadi, Fitsum |
spellingShingle |
Ryan, Peter G. Dilley, Ben J. Davies, Delia Glass, Trevor Abadi, Fitsum Short-term movement patterns, population estimates and breeding biology of an island endemic bird, the Tristan Thrush |
author_facet |
Ryan, Peter G. Dilley, Ben J. Davies, Delia Glass, Trevor Abadi, Fitsum |
author_sort |
Ryan, Peter G. |
title |
Short-term movement patterns, population estimates and breeding biology of an island endemic bird, the Tristan Thrush |
title_short |
Short-term movement patterns, population estimates and breeding biology of an island endemic bird, the Tristan Thrush |
title_full |
Short-term movement patterns, population estimates and breeding biology of an island endemic bird, the Tristan Thrush |
title_fullStr |
Short-term movement patterns, population estimates and breeding biology of an island endemic bird, the Tristan Thrush |
title_full_unstemmed |
Short-term movement patterns, population estimates and breeding biology of an island endemic bird, the Tristan Thrush |
title_sort |
short-term movement patterns, population estimates and breeding biology of an island endemic bird, the tristan thrush |
publisher |
Springer Science and Business Media LLC |
publishDate |
2019 |
url |
http://dx.doi.org/10.1007/bf03546070 http://link.springer.com/content/pdf/10.1007/BF03546070.pdf http://link.springer.com/article/10.1007/BF03546070/fulltext.html |
long_lat |
ENVELOPE(166.350,166.350,-77.650,-77.650) ENVELOPE(-38.220,-38.220,-54.007,-54.007) ENVELOPE(140.900,140.900,-66.735,-66.735) |
geographic |
Inaccessible Island Main Island Tristan |
geographic_facet |
Inaccessible Island Main Island Tristan |
genre |
Inaccessible Island |
genre_facet |
Inaccessible Island |
op_source |
Revista Brasileira de Ornitologia volume 27, issue 4, page 245-252 ISSN 2178-7875 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/bf03546070 |
container_title |
Revista Brasileira de Ornitologia |
container_volume |
27 |
container_issue |
4 |
container_start_page |
245 |
op_container_end_page |
252 |
_version_ |
1766044280602755072 |