Temporal structure of diving behaviour in sympatric Antarctic and Subantarctic fur seals
Lactation is considerably briefer (4 vs. 10 mo) and daily pup energy expenditure higher in Antarctic (AFS) than in subantarctic fur seals (SFS), even in sympatric populations of both species, where their foraging locations and diets are similar. Therefore, lactational demands may be higher for AFS f...
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ftdeakinunifig:oai:figshare.com:article/21054643 2023-05-15T14:01:50+02:00 Temporal structure of diving behaviour in sympatric Antarctic and Subantarctic fur seals S Luque John Arnould C Guinet 2008-01-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30017841 https://figshare.com/articles/journal_contribution/Temporal_structure_of_diving_behaviour_in_sympatric_Antarctic_and_Subantarctic_fur_seals/21054643 unknown http://hdl.handle.net/10536/DRO/DU:30017841 https://figshare.com/articles/journal_contribution/Temporal_structure_of_diving_behaviour_in_sympatric_Antarctic_and_Subantarctic_fur_seals/21054643 All Rights Reserved Oceanography Ecology Zoology optimal foraging foraging niche segregation foraging behaviour diel trends diurnal activity myctophidae syntopy archival tags Science & Technology Life Sciences & Biomedicine Physical Sciences Marine & Freshwater Biology Environmental Sciences & Ecology FORAGING BEHAVIOR ARCTOCEPHALUS-TROPICALIS SPLITTING BEHAVIOR DIVE CYCLES BODY-SIZE PREY COMPETITION PREDATOR HABITAT GROWTH Text Journal contribution 2008 ftdeakinunifig 2022-11-17T22:53:21Z Lactation is considerably briefer (4 vs. 10 mo) and daily pup energy expenditure higher in Antarctic (AFS) than in subantarctic fur seals (SFS), even in sympatric populations of both species, where their foraging locations and diets are similar. Therefore, lactational demands may be higher for AFS females. We investigated whether sympatric lactating AFS and SFS females differ in their physiological or behavioural diving capacities, and in the temporal structure of foraging behaviour. Mean dive depth and duration were greater in SFS, but dives below 140 m were performed only by AFS. An index of activity level during the bottom phase of dives, when fur seals are thought to capture prey, was higher in SFS. Despite these differences, SFS females showed a steady increase in the minimum postdive interval following dives lasting longer than 250 s, compared to the steady increase following dives lasting longer than only 150 s in AFS. These results suggest that physiological constraints on diving behaviour are stronger on AFS females, and that the behavioural aerobic dive limit is greater for SFS. Assuming that dive bouts reflect foraging in prey patches, AFS females exploited more patches per unit time, and remained in them for briefer periods of time, compared to SFS females. Dive bout structure did not differ between overnight and long foraging trips. Our data suggest that AFS females spend greater foraging effort, but may gain access to prey patches of better quality, which may help them cope with higher lactational demands. Other Non-Article Part of Journal/Newspaper Antarc* Antarctic DRO - Deakin Research Online Antarctic |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Oceanography Ecology Zoology optimal foraging foraging niche segregation foraging behaviour diel trends diurnal activity myctophidae syntopy archival tags Science & Technology Life Sciences & Biomedicine Physical Sciences Marine & Freshwater Biology Environmental Sciences & Ecology FORAGING BEHAVIOR ARCTOCEPHALUS-TROPICALIS SPLITTING BEHAVIOR DIVE CYCLES BODY-SIZE PREY COMPETITION PREDATOR HABITAT GROWTH |
spellingShingle |
Oceanography Ecology Zoology optimal foraging foraging niche segregation foraging behaviour diel trends diurnal activity myctophidae syntopy archival tags Science & Technology Life Sciences & Biomedicine Physical Sciences Marine & Freshwater Biology Environmental Sciences & Ecology FORAGING BEHAVIOR ARCTOCEPHALUS-TROPICALIS SPLITTING BEHAVIOR DIVE CYCLES BODY-SIZE PREY COMPETITION PREDATOR HABITAT GROWTH S Luque John Arnould C Guinet Temporal structure of diving behaviour in sympatric Antarctic and Subantarctic fur seals |
topic_facet |
Oceanography Ecology Zoology optimal foraging foraging niche segregation foraging behaviour diel trends diurnal activity myctophidae syntopy archival tags Science & Technology Life Sciences & Biomedicine Physical Sciences Marine & Freshwater Biology Environmental Sciences & Ecology FORAGING BEHAVIOR ARCTOCEPHALUS-TROPICALIS SPLITTING BEHAVIOR DIVE CYCLES BODY-SIZE PREY COMPETITION PREDATOR HABITAT GROWTH |
description |
Lactation is considerably briefer (4 vs. 10 mo) and daily pup energy expenditure higher in Antarctic (AFS) than in subantarctic fur seals (SFS), even in sympatric populations of both species, where their foraging locations and diets are similar. Therefore, lactational demands may be higher for AFS females. We investigated whether sympatric lactating AFS and SFS females differ in their physiological or behavioural diving capacities, and in the temporal structure of foraging behaviour. Mean dive depth and duration were greater in SFS, but dives below 140 m were performed only by AFS. An index of activity level during the bottom phase of dives, when fur seals are thought to capture prey, was higher in SFS. Despite these differences, SFS females showed a steady increase in the minimum postdive interval following dives lasting longer than 250 s, compared to the steady increase following dives lasting longer than only 150 s in AFS. These results suggest that physiological constraints on diving behaviour are stronger on AFS females, and that the behavioural aerobic dive limit is greater for SFS. Assuming that dive bouts reflect foraging in prey patches, AFS females exploited more patches per unit time, and remained in them for briefer periods of time, compared to SFS females. Dive bout structure did not differ between overnight and long foraging trips. Our data suggest that AFS females spend greater foraging effort, but may gain access to prey patches of better quality, which may help them cope with higher lactational demands. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
S Luque John Arnould C Guinet |
author_facet |
S Luque John Arnould C Guinet |
author_sort |
S Luque |
title |
Temporal structure of diving behaviour in sympatric Antarctic and Subantarctic fur seals |
title_short |
Temporal structure of diving behaviour in sympatric Antarctic and Subantarctic fur seals |
title_full |
Temporal structure of diving behaviour in sympatric Antarctic and Subantarctic fur seals |
title_fullStr |
Temporal structure of diving behaviour in sympatric Antarctic and Subantarctic fur seals |
title_full_unstemmed |
Temporal structure of diving behaviour in sympatric Antarctic and Subantarctic fur seals |
title_sort |
temporal structure of diving behaviour in sympatric antarctic and subantarctic fur seals |
publishDate |
2008 |
url |
http://hdl.handle.net/10536/DRO/DU:30017841 https://figshare.com/articles/journal_contribution/Temporal_structure_of_diving_behaviour_in_sympatric_Antarctic_and_Subantarctic_fur_seals/21054643 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30017841 https://figshare.com/articles/journal_contribution/Temporal_structure_of_diving_behaviour_in_sympatric_Antarctic_and_Subantarctic_fur_seals/21054643 |
op_rights |
All Rights Reserved |
_version_ |
1766271896611979264 |