Utilisation of intensive foraging zones by female Australian fur seals
Within a heterogeneous environment, animals must efficiently locate and utilise foraging patches. One way animals can achieve this is by increasing residency times in areas where foraging success is highest (area-restricted search). For air-breathing diving predators, increased patch residency times...
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ftdeakinunifig:oai:figshare.com:article/20913760 2023-05-15T16:05:46+02:00 Utilisation of intensive foraging zones by female Australian fur seals Andrew Hoskins D P Costa John Arnould 2015-01-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30070858 https://figshare.com/articles/journal_contribution/Utilisation_of_intensive_foraging_zones_by_female_Australian_fur_seals/20913760 unknown http://hdl.handle.net/10536/DRO/DU:30070858 https://figshare.com/articles/journal_contribution/Utilisation_of_intensive_foraging_zones_by_female_Australian_fur_seals/20913760 All Rights Reserved Uncategorized Animals Australia Behavior Animal Diving Feeding Behavior Female Fur Seals Geography Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics AREA-RESTRICTED SEARCH SOUTHERN ELEPHANT SEALS LIONS PHOCARCTOS-HOOKERI AEROBIC DIVE LIMIT OPTIMAL PATCH USE 1ST PASSAGE TIME MARINE PREDATOR DIVING BEHAVIOR 1ST-PASSAGE TIME HABITAT USE Text Journal contribution 2015 ftdeakinunifig 2022-11-17T21:25:28Z Within a heterogeneous environment, animals must efficiently locate and utilise foraging patches. One way animals can achieve this is by increasing residency times in areas where foraging success is highest (area-restricted search). For air-breathing diving predators, increased patch residency times can be achieved by altering both surface movements and diving patterns. The current study aimed to spatially identify the areas where female Australian fur seals allocated the most foraging effort, while simultaneously determining the behavioural changes that occur when they increase their foraging intensity. To achieve this, foraging behaviour was successfully recorded with a FastLoc GPS logger and dive behaviour recorder from 29 individual females provisioning pups. Females travelled an average of 118 ± 50 km from their colony during foraging trips that lasted 7.3 ± 3.4 days. Comparison of two methods for calculating foraging intensity (first-passage time and first-passage time modified to include diving behaviour) determined that, due to extended surface intervals where individuals did not travel, inclusion of diving behaviour into foraging analyses was important for this species. Foraging intensity 'hot spots' were found to exist in a mosaic of patches within the Bass Basin, primarily to the south-west of the colony. However, the composition of benthic habitat being targeted remains unclear. When increasing their foraging intensity, individuals tended to perform dives around 148 s or greater, with descent/ascent rates of approximately 1.9 m•s-1 or greater and reduced postdive durations. This suggests individuals were maximising their time within the benthic foraging zone. Furthermore, individuals increased tortuosity and decreased travel speeds while at the surface to maximise their time within a foraging location. These results suggest Australian fur seals will modify both surface movements and diving behaviour to maximise their time within a foraging patch. Other Non-Article Part of Journal/Newspaper Elephant Seals Southern Elephant Seals DRO - Deakin Research Online |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Uncategorized Animals Australia Behavior Animal Diving Feeding Behavior Female Fur Seals Geography Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics AREA-RESTRICTED SEARCH SOUTHERN ELEPHANT SEALS LIONS PHOCARCTOS-HOOKERI AEROBIC DIVE LIMIT OPTIMAL PATCH USE 1ST PASSAGE TIME MARINE PREDATOR DIVING BEHAVIOR 1ST-PASSAGE TIME HABITAT USE |
spellingShingle |
Uncategorized Animals Australia Behavior Animal Diving Feeding Behavior Female Fur Seals Geography Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics AREA-RESTRICTED SEARCH SOUTHERN ELEPHANT SEALS LIONS PHOCARCTOS-HOOKERI AEROBIC DIVE LIMIT OPTIMAL PATCH USE 1ST PASSAGE TIME MARINE PREDATOR DIVING BEHAVIOR 1ST-PASSAGE TIME HABITAT USE Andrew Hoskins D P Costa John Arnould Utilisation of intensive foraging zones by female Australian fur seals |
topic_facet |
Uncategorized Animals Australia Behavior Animal Diving Feeding Behavior Female Fur Seals Geography Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics AREA-RESTRICTED SEARCH SOUTHERN ELEPHANT SEALS LIONS PHOCARCTOS-HOOKERI AEROBIC DIVE LIMIT OPTIMAL PATCH USE 1ST PASSAGE TIME MARINE PREDATOR DIVING BEHAVIOR 1ST-PASSAGE TIME HABITAT USE |
description |
Within a heterogeneous environment, animals must efficiently locate and utilise foraging patches. One way animals can achieve this is by increasing residency times in areas where foraging success is highest (area-restricted search). For air-breathing diving predators, increased patch residency times can be achieved by altering both surface movements and diving patterns. The current study aimed to spatially identify the areas where female Australian fur seals allocated the most foraging effort, while simultaneously determining the behavioural changes that occur when they increase their foraging intensity. To achieve this, foraging behaviour was successfully recorded with a FastLoc GPS logger and dive behaviour recorder from 29 individual females provisioning pups. Females travelled an average of 118 ± 50 km from their colony during foraging trips that lasted 7.3 ± 3.4 days. Comparison of two methods for calculating foraging intensity (first-passage time and first-passage time modified to include diving behaviour) determined that, due to extended surface intervals where individuals did not travel, inclusion of diving behaviour into foraging analyses was important for this species. Foraging intensity 'hot spots' were found to exist in a mosaic of patches within the Bass Basin, primarily to the south-west of the colony. However, the composition of benthic habitat being targeted remains unclear. When increasing their foraging intensity, individuals tended to perform dives around 148 s or greater, with descent/ascent rates of approximately 1.9 m•s-1 or greater and reduced postdive durations. This suggests individuals were maximising their time within the benthic foraging zone. Furthermore, individuals increased tortuosity and decreased travel speeds while at the surface to maximise their time within a foraging location. These results suggest Australian fur seals will modify both surface movements and diving behaviour to maximise their time within a foraging patch. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Andrew Hoskins D P Costa John Arnould |
author_facet |
Andrew Hoskins D P Costa John Arnould |
author_sort |
Andrew Hoskins |
title |
Utilisation of intensive foraging zones by female Australian fur seals |
title_short |
Utilisation of intensive foraging zones by female Australian fur seals |
title_full |
Utilisation of intensive foraging zones by female Australian fur seals |
title_fullStr |
Utilisation of intensive foraging zones by female Australian fur seals |
title_full_unstemmed |
Utilisation of intensive foraging zones by female Australian fur seals |
title_sort |
utilisation of intensive foraging zones by female australian fur seals |
publishDate |
2015 |
url |
http://hdl.handle.net/10536/DRO/DU:30070858 https://figshare.com/articles/journal_contribution/Utilisation_of_intensive_foraging_zones_by_female_Australian_fur_seals/20913760 |
genre |
Elephant Seals Southern Elephant Seals |
genre_facet |
Elephant Seals Southern Elephant Seals |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30070858 https://figshare.com/articles/journal_contribution/Utilisation_of_intensive_foraging_zones_by_female_Australian_fur_seals/20913760 |
op_rights |
All Rights Reserved |
_version_ |
1766401659054850048 |