Energy requirements and daily food consumption of crabeater seals in the Antarctic winter pack-ice
Progress Code: completed Although the most abundant of all mammalian predators in the Antarctic marine ecosystem, crabeater seals are also one of the least understood. The most fundamental question of all - how many are there? - is the focus of an extensive international collaborative program (the A...
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Online Access: | https://researchdata.edu.au/energy-requirements-daily-pack-ice/2820942 |
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ftands:oai:ands.org.au::2820942 2023-12-03T10:09:58+01:00 Energy requirements and daily food consumption of crabeater seals in the Antarctic winter pack-ice Spatial: westlimit=130; southlimit=-66.0; eastlimit=150; northlimit=-64.0 Temporal: From 1999-07-01 to 1999-08-31 https://researchdata.edu.au/energy-requirements-daily-pack-ice/2820942 unknown Australian Ocean Data Network https://researchdata.edu.au/energy-requirements-daily-pack-ice/2820942 ASAC_1090 AU/AADC > Australian Antarctic Data Centre, Australia biota oceans EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES ANIMALS/VERTEBRATES > MAMMALS BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > CONSUMPTION RATES SPECIES/POPULATION INTERACTIONS > USE/FEEDING HABITATS MAMMALS > CARNIVORES > SEALS/SEA LIONS/WALRUSES BATHYMETRY CRABEATER SEALS DENSITY DISTRIBUTION HABITAT USE LOBODON CARCINOPHAGUS MERTZ GLACIER POLYNYA POLYNYA SEA ICE WINTER FIELD INVESTIGATION FIELD SURVEYS AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR dataset ftands 2023-11-06T23:51:52Z Progress Code: completed Although the most abundant of all mammalian predators in the Antarctic marine ecosystem, crabeater seals are also one of the least understood. The most fundamental question of all - how many are there? - is the focus of an extensive international collaborative program (the Antarctic Pack-ice Seal Program, or APIS). This study supplements APIS by providing additional data on the diving behaviour and food requirements of crabeater seals, that can be used in conjunction with census data to provide information on the role of crabeater seals in the antarctic ecosystem. Winter densities and distributions of Crabeater seals were collected during 1999. Crabeater seals were most often encountered on the shelf break. The data collected include numbers of seals sighted per hour in relation to the amount of time the ship spent in each 0.5 degree grid square. This study is the first to describe the winter distribution of crabeater seals (Lobodon carcinophagus) in East Antarctica. The study was conducted in the Mertz Glacier Polynya region from July to August 1999. In total 89 crabeater seals were seen in 26 groups which ranged in size from 1 to 35 animals (mean = 3.2). The mean observed haulout density along a 200m wide strip transect was 0.108 seals per square kilometre, or 0.042 groups per square kilometre. Crabeater seals were not uniformly distributed in the polynya but selected areas of stable ice over shallow (less than 1000m) waters. We used a generalised linear model to assess the relationship of seal distribution to the physical attributes of sea ice concentration, thickness, and ocean depth. We found that ice thickness and ocean depth were the most important determinants of seal distribution. Crabeater seals occurred in areas where the ice affords them a stable haulout platform while allowing them access to Antarctic krill that live directly beneath the ice. Dataset Antarc* Antarctic Antarctic Krill Antarctica Crabeater Seals East Antarctica Lobodon carcinophagus Mertz Glacier Sea ice Southern Ocean walrus* Research Data Australia (Australian National Data Service - ANDS) Antarctic Southern Ocean The Antarctic East Antarctica Mertz Glacier ENVELOPE(144.500,144.500,-67.667,-67.667) |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
biota oceans EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES ANIMALS/VERTEBRATES > MAMMALS BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > CONSUMPTION RATES SPECIES/POPULATION INTERACTIONS > USE/FEEDING HABITATS MAMMALS > CARNIVORES > SEALS/SEA LIONS/WALRUSES BATHYMETRY CRABEATER SEALS DENSITY DISTRIBUTION HABITAT USE LOBODON CARCINOPHAGUS MERTZ GLACIER POLYNYA POLYNYA SEA ICE WINTER FIELD INVESTIGATION FIELD SURVEYS AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR |
spellingShingle |
biota oceans EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES ANIMALS/VERTEBRATES > MAMMALS BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > CONSUMPTION RATES SPECIES/POPULATION INTERACTIONS > USE/FEEDING HABITATS MAMMALS > CARNIVORES > SEALS/SEA LIONS/WALRUSES BATHYMETRY CRABEATER SEALS DENSITY DISTRIBUTION HABITAT USE LOBODON CARCINOPHAGUS MERTZ GLACIER POLYNYA POLYNYA SEA ICE WINTER FIELD INVESTIGATION FIELD SURVEYS AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR Energy requirements and daily food consumption of crabeater seals in the Antarctic winter pack-ice |
topic_facet |
biota oceans EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES ANIMALS/VERTEBRATES > MAMMALS BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > CONSUMPTION RATES SPECIES/POPULATION INTERACTIONS > USE/FEEDING HABITATS MAMMALS > CARNIVORES > SEALS/SEA LIONS/WALRUSES BATHYMETRY CRABEATER SEALS DENSITY DISTRIBUTION HABITAT USE LOBODON CARCINOPHAGUS MERTZ GLACIER POLYNYA POLYNYA SEA ICE WINTER FIELD INVESTIGATION FIELD SURVEYS AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR |
description |
Progress Code: completed Although the most abundant of all mammalian predators in the Antarctic marine ecosystem, crabeater seals are also one of the least understood. The most fundamental question of all - how many are there? - is the focus of an extensive international collaborative program (the Antarctic Pack-ice Seal Program, or APIS). This study supplements APIS by providing additional data on the diving behaviour and food requirements of crabeater seals, that can be used in conjunction with census data to provide information on the role of crabeater seals in the antarctic ecosystem. Winter densities and distributions of Crabeater seals were collected during 1999. Crabeater seals were most often encountered on the shelf break. The data collected include numbers of seals sighted per hour in relation to the amount of time the ship spent in each 0.5 degree grid square. This study is the first to describe the winter distribution of crabeater seals (Lobodon carcinophagus) in East Antarctica. The study was conducted in the Mertz Glacier Polynya region from July to August 1999. In total 89 crabeater seals were seen in 26 groups which ranged in size from 1 to 35 animals (mean = 3.2). The mean observed haulout density along a 200m wide strip transect was 0.108 seals per square kilometre, or 0.042 groups per square kilometre. Crabeater seals were not uniformly distributed in the polynya but selected areas of stable ice over shallow (less than 1000m) waters. We used a generalised linear model to assess the relationship of seal distribution to the physical attributes of sea ice concentration, thickness, and ocean depth. We found that ice thickness and ocean depth were the most important determinants of seal distribution. Crabeater seals occurred in areas where the ice affords them a stable haulout platform while allowing them access to Antarctic krill that live directly beneath the ice. |
format |
Dataset |
title |
Energy requirements and daily food consumption of crabeater seals in the Antarctic winter pack-ice |
title_short |
Energy requirements and daily food consumption of crabeater seals in the Antarctic winter pack-ice |
title_full |
Energy requirements and daily food consumption of crabeater seals in the Antarctic winter pack-ice |
title_fullStr |
Energy requirements and daily food consumption of crabeater seals in the Antarctic winter pack-ice |
title_full_unstemmed |
Energy requirements and daily food consumption of crabeater seals in the Antarctic winter pack-ice |
title_sort |
energy requirements and daily food consumption of crabeater seals in the antarctic winter pack-ice |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.edu.au/energy-requirements-daily-pack-ice/2820942 |
op_coverage |
Spatial: westlimit=130; southlimit=-66.0; eastlimit=150; northlimit=-64.0 Temporal: From 1999-07-01 to 1999-08-31 |
long_lat |
ENVELOPE(144.500,144.500,-67.667,-67.667) |
geographic |
Antarctic Southern Ocean The Antarctic East Antarctica Mertz Glacier |
geographic_facet |
Antarctic Southern Ocean The Antarctic East Antarctica Mertz Glacier |
genre |
Antarc* Antarctic Antarctic Krill Antarctica Crabeater Seals East Antarctica Lobodon carcinophagus Mertz Glacier Sea ice Southern Ocean walrus* |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica Crabeater Seals East Antarctica Lobodon carcinophagus Mertz Glacier Sea ice Southern Ocean walrus* |
op_source |
AU/AADC > Australian Antarctic Data Centre, Australia |
op_relation |
https://researchdata.edu.au/energy-requirements-daily-pack-ice/2820942 ASAC_1090 |
_version_ |
1784268756725268480 |