Foraging behaviour of King Penguins (Aptenodytes patagonicus) in relation to predictable mesoscale oceanographic features in the Polar Front Zone to the north of South Georgia
Marine predators are thought to utilise oceanic features adjusting their foraging strategy in a scale-dependent manner. Thus, they are thought to dynamically alter their foraging behaviour in response to environmental conditions encountered. In this study, we examined the foraging behaviour of King...
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ftnerc:oai:nora.nerc.ac.uk:10582 2023-05-15T17:03:54+02:00 Foraging behaviour of King Penguins (Aptenodytes patagonicus) in relation to predictable mesoscale oceanographic features in the Polar Front Zone to the north of South Georgia Scheffer, Annette Trathan, Phil Collins, Martin 2010 http://nora.nerc.ac.uk/id/eprint/10582/ unknown Pergamon-Elsevier Scheffer, Annette; Trathan, Phil orcid:0000-0001-6673-9930 Collins, Martin. 2010 Foraging behaviour of King Penguins (Aptenodytes patagonicus) in relation to predictable mesoscale oceanographic features in the Polar Front Zone to the north of South Georgia. Progress in Oceanography, 86 (1-2). 232-245. https://doi.org/10.1016/j.pocean.2010.04.008 <https://doi.org/10.1016/j.pocean.2010.04.008> Zoology Ecology and Environment Publication - Article PeerReviewed 2010 ftnerc https://doi.org/10.1016/j.pocean.2010.04.008 2023-02-04T19:26:49Z Marine predators are thought to utilise oceanic features adjusting their foraging strategy in a scale-dependent manner. Thus, they are thought to dynamically alter their foraging behaviour in response to environmental conditions encountered. In this study, we examined the foraging behaviour of King Penguins (Aptenodytes patagonicus) breeding at South Georgia in relation to predictable and stable oceanographic features. We studied penguins during their long post-laying foraging trips during December 2005 and January 2006. For this investigation, we undertook a simultaneous analysis of ARGOS satellite-tracking data and Mk 7 Wild Life Computers Time Depth Recorder (TDR) dive data. To investigate correlations between foraging behaviour and oceanographic conditions, we used SST data from January 2006 from MODIS satellite AQUA. To determine changes in search effort, first passage time (FPT) was calculated; for analysis of dive behaviour, we used several dive parameters that are thought to be reliable indicators of changes in foraging behaviour. King Penguins appeared to target predictable mesoscale features in the Polar Front Zone (PFZ), either a warm-core eddy in the PFZ or regions of strong temperature gradients at oceanic fronts. Two different trip types could be distinguished: direct trips with a straight path to one foraging area at the edge of an eddy or at a thermal front, and circular trips where birds foraged along strong thermal gradients at the northern limit of the PFZ. It is likely that both trip types were a direct consequence of prey encounter rates and distributions, both of which are likely to be associated with these oceanographic features. Circular trips often included passages across the centre of an eddy where birds made deep foraging dives, but remained only a short time in the eddy, possibly because prey were too deep. All birds showed Area Restricted Search (ARS) at scales of <10 km. The two trip types had different ARS patterns, with clear ARS hotspots for direct trips and several ARS ... Article in Journal/Newspaper King Penguins Natural Environment Research Council: NERC Open Research Archive Progress in Oceanography 86 1-2 232 245 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Zoology Ecology and Environment |
spellingShingle |
Zoology Ecology and Environment Scheffer, Annette Trathan, Phil Collins, Martin Foraging behaviour of King Penguins (Aptenodytes patagonicus) in relation to predictable mesoscale oceanographic features in the Polar Front Zone to the north of South Georgia |
topic_facet |
Zoology Ecology and Environment |
description |
Marine predators are thought to utilise oceanic features adjusting their foraging strategy in a scale-dependent manner. Thus, they are thought to dynamically alter their foraging behaviour in response to environmental conditions encountered. In this study, we examined the foraging behaviour of King Penguins (Aptenodytes patagonicus) breeding at South Georgia in relation to predictable and stable oceanographic features. We studied penguins during their long post-laying foraging trips during December 2005 and January 2006. For this investigation, we undertook a simultaneous analysis of ARGOS satellite-tracking data and Mk 7 Wild Life Computers Time Depth Recorder (TDR) dive data. To investigate correlations between foraging behaviour and oceanographic conditions, we used SST data from January 2006 from MODIS satellite AQUA. To determine changes in search effort, first passage time (FPT) was calculated; for analysis of dive behaviour, we used several dive parameters that are thought to be reliable indicators of changes in foraging behaviour. King Penguins appeared to target predictable mesoscale features in the Polar Front Zone (PFZ), either a warm-core eddy in the PFZ or regions of strong temperature gradients at oceanic fronts. Two different trip types could be distinguished: direct trips with a straight path to one foraging area at the edge of an eddy or at a thermal front, and circular trips where birds foraged along strong thermal gradients at the northern limit of the PFZ. It is likely that both trip types were a direct consequence of prey encounter rates and distributions, both of which are likely to be associated with these oceanographic features. Circular trips often included passages across the centre of an eddy where birds made deep foraging dives, but remained only a short time in the eddy, possibly because prey were too deep. All birds showed Area Restricted Search (ARS) at scales of <10 km. The two trip types had different ARS patterns, with clear ARS hotspots for direct trips and several ARS ... |
format |
Article in Journal/Newspaper |
author |
Scheffer, Annette Trathan, Phil Collins, Martin |
author_facet |
Scheffer, Annette Trathan, Phil Collins, Martin |
author_sort |
Scheffer, Annette |
title |
Foraging behaviour of King Penguins (Aptenodytes patagonicus) in relation to predictable mesoscale oceanographic features in the Polar Front Zone to the north of South Georgia |
title_short |
Foraging behaviour of King Penguins (Aptenodytes patagonicus) in relation to predictable mesoscale oceanographic features in the Polar Front Zone to the north of South Georgia |
title_full |
Foraging behaviour of King Penguins (Aptenodytes patagonicus) in relation to predictable mesoscale oceanographic features in the Polar Front Zone to the north of South Georgia |
title_fullStr |
Foraging behaviour of King Penguins (Aptenodytes patagonicus) in relation to predictable mesoscale oceanographic features in the Polar Front Zone to the north of South Georgia |
title_full_unstemmed |
Foraging behaviour of King Penguins (Aptenodytes patagonicus) in relation to predictable mesoscale oceanographic features in the Polar Front Zone to the north of South Georgia |
title_sort |
foraging behaviour of king penguins (aptenodytes patagonicus) in relation to predictable mesoscale oceanographic features in the polar front zone to the north of south georgia |
publisher |
Pergamon-Elsevier |
publishDate |
2010 |
url |
http://nora.nerc.ac.uk/id/eprint/10582/ |
genre |
King Penguins |
genre_facet |
King Penguins |
op_relation |
Scheffer, Annette; Trathan, Phil orcid:0000-0001-6673-9930 Collins, Martin. 2010 Foraging behaviour of King Penguins (Aptenodytes patagonicus) in relation to predictable mesoscale oceanographic features in the Polar Front Zone to the north of South Georgia. Progress in Oceanography, 86 (1-2). 232-245. https://doi.org/10.1016/j.pocean.2010.04.008 <https://doi.org/10.1016/j.pocean.2010.04.008> |
op_doi |
https://doi.org/10.1016/j.pocean.2010.04.008 |
container_title |
Progress in Oceanography |
container_volume |
86 |
container_issue |
1-2 |
container_start_page |
232 |
op_container_end_page |
245 |
_version_ |
1766057861455020032 |