The same pathway to the Weddell Sea birdlife, after 65 years: similarities in the species composition, richness and abundances
As part of a multi-year study of top predators in Antarctica, we conducted a seabird shipbased survey on board Almirante Irizar icebreaker in the Weddell Sea to the Filchner Ice Shelf in the austral summer 2020. We carried out 10-minute counts along 1843 km during 125 hours of observation. We analyz...
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ftmasarykunivojs:oai:ojs.journals.muni.cz:article/20744 2023-05-15T13:46:41+02:00 The same pathway to the Weddell Sea birdlife, after 65 years: similarities in the species composition, richness and abundances Orgeira, José Luis Alvarez, Facundo Salvó, Constanza Sofía 2022-02-19 application/pdf https://journals.muni.cz/CPR/article/view/20744 eng eng Masaryk Univerzity https://journals.muni.cz/CPR/article/view/20744/16662 https://journals.muni.cz/CPR/article/view/20744 Copyright (c) 2022 Czech Polar Reports Czech Polar Reports; Vol 11 No 2 (2021); 291-304 Czech Polar Reports; Vol. 11 No. 2 (2021); 291-304 1805-0697 1805-0689 Birdlife Placopsis antarctica ice cover Antarctic petrel Filchner ice shelf warming info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftmasarykunivojs 2022-09-05T23:19:16Z As part of a multi-year study of top predators in Antarctica, we conducted a seabird shipbased survey on board Almirante Irizar icebreaker in the Weddell Sea to the Filchner Ice Shelf in the austral summer 2020. We carried out 10-minute counts along 1843 km during 125 hours of observation. We analyzed the species distributions and the relationships with the ice cover. We registered 15 species of which four represented more than 85% of the total abundance: Antarctic petrel Thalassoica antarctica (43.9%), snow petrel Pagodroma nivea (16.3%), Arctic tern Sterna paradisaea (15.2%) and emperor penguin Aptenodytes forsteri (10.1%). Species distribution and its relationship with ice cover were analyzed statistically. The ice cover concentration was estimated by using satellite images. We compared our results with the first ship-based bird survey conducted up to the Filchner Ice Shelf in the austral summer 1955/56 to analyze possible changes in the bird community over time. Out of 13 recorded species in the 1955/56 cruise, 11 were present in this study with similar abundance proportions. In both cruises, the bird community consisted of a group of non-numerous species associated with icefree waters and another group of very numerous species associated with high concentrations on ice cover. The similarities between the two cruises, spaced 65 years apart, suggest a temporal persistence of the bird community of the central and the southern Weddell Sea that could be explained by the dynamics of the ice cover and the presence of reproductive colonies within the study site. The current environmental warming is alarming in this bird community because more than 85% of all its individuals belong to four species strongly dependent on ice cover. Article in Journal/Newspaper Antarc* Antarctic Antarctic Petrel Antarctica Aptenodytes forsteri Arctic Arctic tern Ice Shelf Icebreaker Snow Petrel Sterna paradisaea Thalassoica antarctica Weddell Sea Masaryk University Journals Arctic Antarctic Weddell Sea Austral Weddell Nivea ENVELOPE(-45.479,-45.479,-60.580,-60.580) Filchner Ice Shelf ENVELOPE(-40.000,-40.000,-79.000,-79.000) Irizar ENVELOPE(162.950,162.950,-75.550,-75.550) |
institution |
Open Polar |
collection |
Masaryk University Journals |
op_collection_id |
ftmasarykunivojs |
language |
English |
topic |
Birdlife Placopsis antarctica ice cover Antarctic petrel Filchner ice shelf warming |
spellingShingle |
Birdlife Placopsis antarctica ice cover Antarctic petrel Filchner ice shelf warming Orgeira, José Luis Alvarez, Facundo Salvó, Constanza Sofía The same pathway to the Weddell Sea birdlife, after 65 years: similarities in the species composition, richness and abundances |
topic_facet |
Birdlife Placopsis antarctica ice cover Antarctic petrel Filchner ice shelf warming |
description |
As part of a multi-year study of top predators in Antarctica, we conducted a seabird shipbased survey on board Almirante Irizar icebreaker in the Weddell Sea to the Filchner Ice Shelf in the austral summer 2020. We carried out 10-minute counts along 1843 km during 125 hours of observation. We analyzed the species distributions and the relationships with the ice cover. We registered 15 species of which four represented more than 85% of the total abundance: Antarctic petrel Thalassoica antarctica (43.9%), snow petrel Pagodroma nivea (16.3%), Arctic tern Sterna paradisaea (15.2%) and emperor penguin Aptenodytes forsteri (10.1%). Species distribution and its relationship with ice cover were analyzed statistically. The ice cover concentration was estimated by using satellite images. We compared our results with the first ship-based bird survey conducted up to the Filchner Ice Shelf in the austral summer 1955/56 to analyze possible changes in the bird community over time. Out of 13 recorded species in the 1955/56 cruise, 11 were present in this study with similar abundance proportions. In both cruises, the bird community consisted of a group of non-numerous species associated with icefree waters and another group of very numerous species associated with high concentrations on ice cover. The similarities between the two cruises, spaced 65 years apart, suggest a temporal persistence of the bird community of the central and the southern Weddell Sea that could be explained by the dynamics of the ice cover and the presence of reproductive colonies within the study site. The current environmental warming is alarming in this bird community because more than 85% of all its individuals belong to four species strongly dependent on ice cover. |
format |
Article in Journal/Newspaper |
author |
Orgeira, José Luis Alvarez, Facundo Salvó, Constanza Sofía |
author_facet |
Orgeira, José Luis Alvarez, Facundo Salvó, Constanza Sofía |
author_sort |
Orgeira, José Luis |
title |
The same pathway to the Weddell Sea birdlife, after 65 years: similarities in the species composition, richness and abundances |
title_short |
The same pathway to the Weddell Sea birdlife, after 65 years: similarities in the species composition, richness and abundances |
title_full |
The same pathway to the Weddell Sea birdlife, after 65 years: similarities in the species composition, richness and abundances |
title_fullStr |
The same pathway to the Weddell Sea birdlife, after 65 years: similarities in the species composition, richness and abundances |
title_full_unstemmed |
The same pathway to the Weddell Sea birdlife, after 65 years: similarities in the species composition, richness and abundances |
title_sort |
same pathway to the weddell sea birdlife, after 65 years: similarities in the species composition, richness and abundances |
publisher |
Masaryk Univerzity |
publishDate |
2022 |
url |
https://journals.muni.cz/CPR/article/view/20744 |
long_lat |
ENVELOPE(-45.479,-45.479,-60.580,-60.580) ENVELOPE(-40.000,-40.000,-79.000,-79.000) ENVELOPE(162.950,162.950,-75.550,-75.550) |
geographic |
Arctic Antarctic Weddell Sea Austral Weddell Nivea Filchner Ice Shelf Irizar |
geographic_facet |
Arctic Antarctic Weddell Sea Austral Weddell Nivea Filchner Ice Shelf Irizar |
genre |
Antarc* Antarctic Antarctic Petrel Antarctica Aptenodytes forsteri Arctic Arctic tern Ice Shelf Icebreaker Snow Petrel Sterna paradisaea Thalassoica antarctica Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Petrel Antarctica Aptenodytes forsteri Arctic Arctic tern Ice Shelf Icebreaker Snow Petrel Sterna paradisaea Thalassoica antarctica Weddell Sea |
op_source |
Czech Polar Reports; Vol 11 No 2 (2021); 291-304 Czech Polar Reports; Vol. 11 No. 2 (2021); 291-304 1805-0697 1805-0689 |
op_relation |
https://journals.muni.cz/CPR/article/view/20744/16662 https://journals.muni.cz/CPR/article/view/20744 |
op_rights |
Copyright (c) 2022 Czech Polar Reports |
_version_ |
1766245091307945984 |