Radar observations of northbound migration of the Arctic tern, Sterna paradisaea, at the Antarctic Peninsula
An intensive migration of Arctic terns was observed from 7–9 March 1989 in Marguerite Bay (67°50'S 67°30'W). The movement pattern and speed of tern flocks were analysed from time-lapse films of a marine navigation radar. The terns migrated north at altitudes 30–60 m asl along the inner coa...
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Language: | English |
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Cambridge University Press (CUP)
1992
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Online Access: | http://dx.doi.org/10.1017/s0954102092000257 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102092000257 |
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crcambridgeupr:10.1017/s0954102092000257 2024-09-09T19:03:28+00:00 Radar observations of northbound migration of the Arctic tern, Sterna paradisaea, at the Antarctic Peninsula Gudmundsson, Gudmundur A. Alerstam, Thomas Larsson, Bertil 1992 http://dx.doi.org/10.1017/s0954102092000257 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102092000257 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 4, issue 2, page 163-170 ISSN 0954-1020 1365-2079 journal-article 1992 crcambridgeupr https://doi.org/10.1017/s0954102092000257 2024-06-19T04:01:51Z An intensive migration of Arctic terns was observed from 7–9 March 1989 in Marguerite Bay (67°50'S 67°30'W). The movement pattern and speed of tern flocks were analysed from time-lapse films of a marine navigation radar. The terns migrated north at altitudes 30–60 m asl along the inner coast of Marguerite Bay. When approaching Pourquois Pas Island, the majority veered to the NNE flying into Bourgeois Fjord. Mean flock size was 11.6 (s.e. = 1.9). The estimated total during the three observation days was about 7600 migrating terns. Analysing flight speed in relation to wind showed that the terns increased their airspeed when flying into headwinds and decreased it with following winds. The terns' airspeeds, with an estimated mean of 11.3 ms -1 (s.e. = 1.3) with no wind effect, were significantly faster than the predicted maximum range speed. It is suggested that the terns were migrating on a connecting route between the pack ice of the Bellingshausen and Weddell Seas, involving a flight across the Antarctic Peninsula. Topographical conditions are favourable for such a passage close to the observation site in Marguerite Bay, where the distance across the 1500 m high ice cap of the Antarctic Peninsula is only 37 km. It remains to be clarified if the suggested migration route is of importance for regional tern populations only, or if it is part of a circumpolar Antarctic migration pattern. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Arctic Arctic tern Ice cap Sterna paradisaea Cambridge University Press Antarctic Antarctic Peninsula Arctic Bourgeois ENVELOPE(-66.996,-66.996,-67.628,-67.628) Bourgeois Fjord ENVELOPE(-67.417,-67.417,-67.833,-67.833) Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) Pourquois-pas ENVELOPE(-67.467,-67.467,-67.683,-67.683) The Antarctic Weddell Antarctic Science 4 2 163 170 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
An intensive migration of Arctic terns was observed from 7–9 March 1989 in Marguerite Bay (67°50'S 67°30'W). The movement pattern and speed of tern flocks were analysed from time-lapse films of a marine navigation radar. The terns migrated north at altitudes 30–60 m asl along the inner coast of Marguerite Bay. When approaching Pourquois Pas Island, the majority veered to the NNE flying into Bourgeois Fjord. Mean flock size was 11.6 (s.e. = 1.9). The estimated total during the three observation days was about 7600 migrating terns. Analysing flight speed in relation to wind showed that the terns increased their airspeed when flying into headwinds and decreased it with following winds. The terns' airspeeds, with an estimated mean of 11.3 ms -1 (s.e. = 1.3) with no wind effect, were significantly faster than the predicted maximum range speed. It is suggested that the terns were migrating on a connecting route between the pack ice of the Bellingshausen and Weddell Seas, involving a flight across the Antarctic Peninsula. Topographical conditions are favourable for such a passage close to the observation site in Marguerite Bay, where the distance across the 1500 m high ice cap of the Antarctic Peninsula is only 37 km. It remains to be clarified if the suggested migration route is of importance for regional tern populations only, or if it is part of a circumpolar Antarctic migration pattern. |
format |
Article in Journal/Newspaper |
author |
Gudmundsson, Gudmundur A. Alerstam, Thomas Larsson, Bertil |
spellingShingle |
Gudmundsson, Gudmundur A. Alerstam, Thomas Larsson, Bertil Radar observations of northbound migration of the Arctic tern, Sterna paradisaea, at the Antarctic Peninsula |
author_facet |
Gudmundsson, Gudmundur A. Alerstam, Thomas Larsson, Bertil |
author_sort |
Gudmundsson, Gudmundur A. |
title |
Radar observations of northbound migration of the Arctic tern, Sterna paradisaea, at the Antarctic Peninsula |
title_short |
Radar observations of northbound migration of the Arctic tern, Sterna paradisaea, at the Antarctic Peninsula |
title_full |
Radar observations of northbound migration of the Arctic tern, Sterna paradisaea, at the Antarctic Peninsula |
title_fullStr |
Radar observations of northbound migration of the Arctic tern, Sterna paradisaea, at the Antarctic Peninsula |
title_full_unstemmed |
Radar observations of northbound migration of the Arctic tern, Sterna paradisaea, at the Antarctic Peninsula |
title_sort |
radar observations of northbound migration of the arctic tern, sterna paradisaea, at the antarctic peninsula |
publisher |
Cambridge University Press (CUP) |
publishDate |
1992 |
url |
http://dx.doi.org/10.1017/s0954102092000257 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102092000257 |
long_lat |
ENVELOPE(-66.996,-66.996,-67.628,-67.628) ENVELOPE(-67.417,-67.417,-67.833,-67.833) ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) ENVELOPE(-67.467,-67.467,-67.683,-67.683) |
geographic |
Antarctic Antarctic Peninsula Arctic Bourgeois Bourgeois Fjord Marguerite Marguerite Bay Pourquois-pas The Antarctic Weddell |
geographic_facet |
Antarctic Antarctic Peninsula Arctic Bourgeois Bourgeois Fjord Marguerite Marguerite Bay Pourquois-pas The Antarctic Weddell |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Arctic Arctic tern Ice cap Sterna paradisaea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Arctic Arctic tern Ice cap Sterna paradisaea |
op_source |
Antarctic Science volume 4, issue 2, page 163-170 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102092000257 |
container_title |
Antarctic Science |
container_volume |
4 |
container_issue |
2 |
container_start_page |
163 |
op_container_end_page |
170 |
_version_ |
1809817481936633856 |