Diving behaviour of sub-adult harbour seals (Phoca vitulina) at Prins Karls Forland, Svalbard
Diving behaviour of sub-adult harbour seals (Phoca vitulina) from Svalbard was studied using time-depth recorders (TDRs, n=3), during the post-moulting period. The TDRs recorded depth and time at 10 s intervals with a depth resolution of 2 m. The seals spent 82±10% of their time in the water and 18±...
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Norwegian Polar Institute
2008
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npolardata:oai:npolar.no:dataset/a4ce28a2-a391-59f3-9857-b7eb0b0d28c5 2024-03-03T22:15:37+00:00 Diving behaviour of sub-adult harbour seals (Phoca vitulina) at Prins Karls Forland, Svalbard Kovacs, Kit M. Gjertz, Ian Krafft, Bjørn Lydersen, Christian BEGINDATE: 1994-09-01 ENDDATE: 1994-09-30 ENVELOPE(11.16666667,11.16666667,78.55,78.55) OCEAN, ATLANTIC OCEAN, NORTH ATLANTIC OCEAN, SVALBARD AND JAN MAYEN, Prins Karls Forland GEOGRAPHIC REGION, ARCTIC GEOGRAPHIC REGION, POLAR 2008-07-09 http://data.npolar.no/dataset/a4ce28a2-a391-59f3-9857-b7eb0b0d28c5 unknown Norwegian Polar Institute BIOTA biology EARTH SCIENCE BIOLOGICAL CLASSIFICATION ANIMALS/VERTEBRATES MAMMALS CARNIVORES SEALS/SEA LIONS/WALRUSES BIOSPHERE ECOLOGICAL DYNAMICS Dataset 2008 npolardata 2017-09-07T07:14:17Z Diving behaviour of sub-adult harbour seals (Phoca vitulina) from Svalbard was studied using time-depth recorders (TDRs, n=3), during the post-moulting period. The TDRs recorded depth and time at 10 s intervals with a depth resolution of 2 m. The seals spent 82±10% of their time in the water and 18±10% of their time hauled out during the autumn study period. Activity patterns were significantly affected by both tidal and light cycles. Most of the dives (n=11,322) were relatively shallow (mean depth 40.6±25.5 m) and of short duration (mean duration 2.6±1.0 min) with maximum depth and duration values of 172 m and 10 min, respectively. The dives were classified into one V- and two U-shaped classes, via PCA and cluster analyses. The most frequent dive type, U 1 -dives, were much deeper, lasted longer, and had longer bottom time and faster ascent and descent rates than the other dive types. Approximately 70% of all dives fell into this category and these dives occurred predominantly in clearly defined bouts. Diving bouts lasted 12.5 h on average and consisted almost entirely of U 1 -dives (97.5%). Harbour-seal foraging in Svalbard, at least that which is performed by juveniles during the autumn, appears to involve dedicated excursions that include very intense diving bouts. Dataset Arctic harbour seal Jan Mayen North Atlantic Phoca vitulina Prins Karls Forland Svalbard walrus* Norwegian Polar Data Centre Arctic Jan Mayen Prins Karls Forland ENVELOPE(11.175,11.175,78.543,78.543) Svalbard Svalbard ENVELOPE(20.000,20.000,78.000,78.000) ENVELOPE(11.16666667,11.16666667,78.55,78.55) |
institution |
Open Polar |
collection |
Norwegian Polar Data Centre |
op_collection_id |
npolardata |
language |
unknown |
topic |
BIOTA biology EARTH SCIENCE BIOLOGICAL CLASSIFICATION ANIMALS/VERTEBRATES MAMMALS CARNIVORES SEALS/SEA LIONS/WALRUSES BIOSPHERE ECOLOGICAL DYNAMICS |
spellingShingle |
BIOTA biology EARTH SCIENCE BIOLOGICAL CLASSIFICATION ANIMALS/VERTEBRATES MAMMALS CARNIVORES SEALS/SEA LIONS/WALRUSES BIOSPHERE ECOLOGICAL DYNAMICS Kovacs, Kit M. Gjertz, Ian Krafft, Bjørn Lydersen, Christian Diving behaviour of sub-adult harbour seals (Phoca vitulina) at Prins Karls Forland, Svalbard |
topic_facet |
BIOTA biology EARTH SCIENCE BIOLOGICAL CLASSIFICATION ANIMALS/VERTEBRATES MAMMALS CARNIVORES SEALS/SEA LIONS/WALRUSES BIOSPHERE ECOLOGICAL DYNAMICS |
description |
Diving behaviour of sub-adult harbour seals (Phoca vitulina) from Svalbard was studied using time-depth recorders (TDRs, n=3), during the post-moulting period. The TDRs recorded depth and time at 10 s intervals with a depth resolution of 2 m. The seals spent 82±10% of their time in the water and 18±10% of their time hauled out during the autumn study period. Activity patterns were significantly affected by both tidal and light cycles. Most of the dives (n=11,322) were relatively shallow (mean depth 40.6±25.5 m) and of short duration (mean duration 2.6±1.0 min) with maximum depth and duration values of 172 m and 10 min, respectively. The dives were classified into one V- and two U-shaped classes, via PCA and cluster analyses. The most frequent dive type, U 1 -dives, were much deeper, lasted longer, and had longer bottom time and faster ascent and descent rates than the other dive types. Approximately 70% of all dives fell into this category and these dives occurred predominantly in clearly defined bouts. Diving bouts lasted 12.5 h on average and consisted almost entirely of U 1 -dives (97.5%). Harbour-seal foraging in Svalbard, at least that which is performed by juveniles during the autumn, appears to involve dedicated excursions that include very intense diving bouts. |
format |
Dataset |
author |
Kovacs, Kit M. Gjertz, Ian Krafft, Bjørn Lydersen, Christian |
author_facet |
Kovacs, Kit M. Gjertz, Ian Krafft, Bjørn Lydersen, Christian |
author_sort |
Kovacs, Kit M. |
title |
Diving behaviour of sub-adult harbour seals (Phoca vitulina) at Prins Karls Forland, Svalbard |
title_short |
Diving behaviour of sub-adult harbour seals (Phoca vitulina) at Prins Karls Forland, Svalbard |
title_full |
Diving behaviour of sub-adult harbour seals (Phoca vitulina) at Prins Karls Forland, Svalbard |
title_fullStr |
Diving behaviour of sub-adult harbour seals (Phoca vitulina) at Prins Karls Forland, Svalbard |
title_full_unstemmed |
Diving behaviour of sub-adult harbour seals (Phoca vitulina) at Prins Karls Forland, Svalbard |
title_sort |
diving behaviour of sub-adult harbour seals (phoca vitulina) at prins karls forland, svalbard |
publisher |
Norwegian Polar Institute |
publishDate |
2008 |
url |
http://data.npolar.no/dataset/a4ce28a2-a391-59f3-9857-b7eb0b0d28c5 |
op_coverage |
BEGINDATE: 1994-09-01 ENDDATE: 1994-09-30 ENVELOPE(11.16666667,11.16666667,78.55,78.55) OCEAN, ATLANTIC OCEAN, NORTH ATLANTIC OCEAN, SVALBARD AND JAN MAYEN, Prins Karls Forland GEOGRAPHIC REGION, ARCTIC GEOGRAPHIC REGION, POLAR |
long_lat |
ENVELOPE(11.175,11.175,78.543,78.543) ENVELOPE(20.000,20.000,78.000,78.000) ENVELOPE(11.16666667,11.16666667,78.55,78.55) |
geographic |
Arctic Jan Mayen Prins Karls Forland Svalbard Svalbard |
geographic_facet |
Arctic Jan Mayen Prins Karls Forland Svalbard Svalbard |
genre |
Arctic harbour seal Jan Mayen North Atlantic Phoca vitulina Prins Karls Forland Svalbard walrus* |
genre_facet |
Arctic harbour seal Jan Mayen North Atlantic Phoca vitulina Prins Karls Forland Svalbard walrus* |
_version_ |
1792545071836430336 |