Cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from South Georgia
The food and feeding ecology of albatrosses during the nonbreeding season is still poorly known, particularly with regard to the cephalopod component. This was studied in black-browed Thalassarche melanophris and grey-headed T. chrysostoma albatrosses by analysing boluses collected shortly after adu...
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2020
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Online Access: | http://hdl.handle.net/10451/41133 https://doi.org/10.1007/s00300-014-1626-3 |
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ftunivlisboa:oai:repositorio.ul.pt:10451/41133 2023-05-15T13:36:26+02:00 Cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from South Georgia Alvito, Pedro M. Rosa, Rui Phillips, Richard A. Cherel, Yves Ceia, Filipe R. Guerreiro, Miguel Seco, José Baeta, Alexandra Vieira, Rui P. Xavier, José C. 2020-01-19T20:00:04Z http://hdl.handle.net/10451/41133 https://doi.org/10.1007/s00300-014-1626-3 eng eng Springer Verlag https://link.springer.com/article/10.1007%2Fs00300-014-1626-3 0722-4060 http://hdl.handle.net/10451/41133 doi:10.1007/s00300-014-1626-3 restrictedAccess Antarctica Albatrosses Cephalopods Thalassarche melanophris Thalassarche chrysostoma article 2020 ftunivlisboa https://doi.org/10.1007/s00300-014-1626-3 2022-05-25T18:39:59Z The food and feeding ecology of albatrosses during the nonbreeding season is still poorly known, particularly with regard to the cephalopod component. This was studied in black-browed Thalassarche melanophris and grey-headed T. chrysostoma albatrosses by analysing boluses collected shortly after adults returned to colonies at Bird Island, South Georgia (54°S, 38°W), in 2009. Based on stable isotopic analyses of the lower beaks, we determined the habitat and trophic level (from δ13C and δ15N, respectively) of the most important cephalopods and assessed the relative importance of scavenging in terms of the albatrosses’ feeding regimes. Based on lower rostral lengths (LRLs), the main cephalopod species in the diets of both albatrosses was Kondakovia longimana, by frequency of occurrence (F > 90 %), number (N > 40 %) and mass (M > 80 %). The large estimated mass of many squid, including K. longimana, suggests that a high proportion (>80 % by mass) was scavenged, and that scavenging is much more important during the nonbreeding season than would be expected from breeding-season diets. The diversity of cephalopods consumed by nonbreeding birds in our study was similar to that recorded during previous breeding seasons, but included two new species [Moroteuthis sp. B (Imber) and ?Mastigoteuthis A (Clarke)]. Based on similarities in LRL, δ13C and δ15N, the squid consumed may have been from the same oceanic populations or region, with the exception of Taonius sp. B (Voss) and K. longimana, which, based on significant differences in δ15N values, suggest that they may have originated from different stocks, indicating differences in the albatrosses’ feeding regimes. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Antarc* Antarctica Bird Island Universidade de Lisboa: repositório.UL Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Polar Biology 38 5 631 641 |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Antarctica Albatrosses Cephalopods Thalassarche melanophris Thalassarche chrysostoma |
spellingShingle |
Antarctica Albatrosses Cephalopods Thalassarche melanophris Thalassarche chrysostoma Alvito, Pedro M. Rosa, Rui Phillips, Richard A. Cherel, Yves Ceia, Filipe R. Guerreiro, Miguel Seco, José Baeta, Alexandra Vieira, Rui P. Xavier, José C. Cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from South Georgia |
topic_facet |
Antarctica Albatrosses Cephalopods Thalassarche melanophris Thalassarche chrysostoma |
description |
The food and feeding ecology of albatrosses during the nonbreeding season is still poorly known, particularly with regard to the cephalopod component. This was studied in black-browed Thalassarche melanophris and grey-headed T. chrysostoma albatrosses by analysing boluses collected shortly after adults returned to colonies at Bird Island, South Georgia (54°S, 38°W), in 2009. Based on stable isotopic analyses of the lower beaks, we determined the habitat and trophic level (from δ13C and δ15N, respectively) of the most important cephalopods and assessed the relative importance of scavenging in terms of the albatrosses’ feeding regimes. Based on lower rostral lengths (LRLs), the main cephalopod species in the diets of both albatrosses was Kondakovia longimana, by frequency of occurrence (F > 90 %), number (N > 40 %) and mass (M > 80 %). The large estimated mass of many squid, including K. longimana, suggests that a high proportion (>80 % by mass) was scavenged, and that scavenging is much more important during the nonbreeding season than would be expected from breeding-season diets. The diversity of cephalopods consumed by nonbreeding birds in our study was similar to that recorded during previous breeding seasons, but included two new species [Moroteuthis sp. B (Imber) and ?Mastigoteuthis A (Clarke)]. Based on similarities in LRL, δ13C and δ15N, the squid consumed may have been from the same oceanic populations or region, with the exception of Taonius sp. B (Voss) and K. longimana, which, based on significant differences in δ15N values, suggest that they may have originated from different stocks, indicating differences in the albatrosses’ feeding regimes. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Alvito, Pedro M. Rosa, Rui Phillips, Richard A. Cherel, Yves Ceia, Filipe R. Guerreiro, Miguel Seco, José Baeta, Alexandra Vieira, Rui P. Xavier, José C. |
author_facet |
Alvito, Pedro M. Rosa, Rui Phillips, Richard A. Cherel, Yves Ceia, Filipe R. Guerreiro, Miguel Seco, José Baeta, Alexandra Vieira, Rui P. Xavier, José C. |
author_sort |
Alvito, Pedro M. |
title |
Cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from South Georgia |
title_short |
Cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from South Georgia |
title_full |
Cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from South Georgia |
title_fullStr |
Cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from South Georgia |
title_full_unstemmed |
Cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from South Georgia |
title_sort |
cephalopods in the diet of nonbreeding black-browed and grey-headed albatrosses from south georgia |
publisher |
Springer Verlag |
publishDate |
2020 |
url |
http://hdl.handle.net/10451/41133 https://doi.org/10.1007/s00300-014-1626-3 |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
geographic |
Bird Island |
geographic_facet |
Bird Island |
genre |
Antarc* Antarctica Bird Island |
genre_facet |
Antarc* Antarctica Bird Island |
op_relation |
https://link.springer.com/article/10.1007%2Fs00300-014-1626-3 0722-4060 http://hdl.handle.net/10451/41133 doi:10.1007/s00300-014-1626-3 |
op_rights |
restrictedAccess |
op_doi |
https://doi.org/10.1007/s00300-014-1626-3 |
container_title |
Polar Biology |
container_volume |
38 |
container_issue |
5 |
container_start_page |
631 |
op_container_end_page |
641 |
_version_ |
1766078381584023552 |