Data

Proportional underwater call type usage by Weddell seals (Leptonychotes weddellii) in breeding and nonbreeding situations

Australian Antarctic Data Centre
TERHUNE, JOHN MOORE ; ROUGET, PHIL A
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.4225/15/54D058FBBE555&rft.title=Proportional underwater call type usage by Weddell seals (Leptonychotes weddellii) in breeding and nonbreeding situations&rft.identifier=10.4225/15/54D058FBBE555&rft.publisher=Australian Antarctic Data Centre&rft.description=During the winter and spring of 2000 and 2002, underwater calls of Weddell seals were recorded near Mawson. The goal was to determine if some call types were only given during the spring breeding season. The calls were classified into 10 broad types and the proportional usage of each was determined from May to December. All call types were present throughout the study period and during periods of darkness and light and at high, medium or low calling rates. Taken from the abstract of the referenced paper: Proportional underwater call type usage by Weddell seals (Leptonychotes weddellii (Lesson, 1826)) near Mawson, Antarctica, investigated the hypothesis that certain call types function specifically in breeding behaviour. Recordings were collected at various sites in 2000 and 2002 from June to December. Twenty-four hour recordings were collected in 2002 at two sites. One hundred consecutive calls from each of 248 recordings were classified into one of ten common call types. Time to 100 calls provided the calling rate. The study period was divided into four periods representing initial sea-ice formation, pre-pupping, pupping, and mating. Calling rate and light-dark differences were also examined. No presence-absence differences were observed for any of the call types with season. The largest difference between nonbreeding and breeding situations was an increase from 32.2% to 38.1% for descending whistles (F[3,244] = 4.483, p = 0.004). Trills gradually increased from 1.8% to 7.3% toward the mating period (F[3,244] = 30.932, p less than 0.001). The proportion of trills, chugs, descending whistles, and other call types also varied with calling rate and light-dark conditions. Some pre-reproductive behaviours may occur in winter, but no call types of Weddell seals function solely in the breeding season.&rft.creator=TERHUNE, JOHN MOORE &rft.creator=ROUGET, PHIL A &rft.date=2012&rft.coverage=northlimit=-67.4; southlimit=-67.65; westlimit=62.2; eastLimit=63.7; projection=WGS84&rft.coverage=northlimit=-67.4; southlimit=-67.65; westlimit=62.2; eastLimit=63.7; projection=WGS84&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_1132-3 when using these data.&rft_subject=biota&rft_subject=oceans&rft_subject=SEALS/SEA LIONS/WALRUSES&rft_subject=EARTH SCIENCE&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=ANIMALS/VERTEBRATES&rft_subject=MAMMALS&rft_subject=CARNIVORES&rft_subject=Weddel seal&rft_subject=Breeding&rft_subject=Non-breeding&rft_subject=underwater calls&rft_subject=Leptonychotes weddellii&rft_subject=vocal behaviour&rft_subject=seasonal variation&rft_subject=HYDROPHONES&rft_subject=FIELD SURVEYS&rft_subject=FIELD INVESTIGATION&rft_subject=OCEAN > SOUTHERN OCEAN&rft_subject=CONTINENT > ANTARCTICA&rft_subject=GEOGRAPHIC REGION > POLAR&rft_place=Hobart&rft.type=dataset&rft.language=English Access the data
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This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_1132-3 when using these data.

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Brief description

During the winter and spring of 2000 and 2002, underwater calls of Weddell seals were recorded near Mawson. The goal was to determine if some call types were only given during the spring breeding season. The calls were classified into 10 broad types and the proportional usage of each was determined from May to December. All call types were present throughout the study period and during periods of darkness and light and at high, medium or low calling rates. Taken from the abstract of the referenced paper: Proportional underwater call type usage by Weddell seals (Leptonychotes weddellii (Lesson, 1826)) near Mawson, Antarctica, investigated the hypothesis that certain call types function specifically in breeding behaviour. Recordings were collected at various sites in 2000 and 2002 from June to December. Twenty-four hour recordings were collected in 2002 at two sites. One hundred consecutive calls from each of 248 recordings were classified into one of ten common call types. Time to 100 calls provided the calling rate. The study period was divided into four periods representing initial sea-ice formation, pre-pupping, pupping, and mating. Calling rate and light-dark differences were also examined. No presence-absence differences were observed for any of the call types with season. The largest difference between nonbreeding and breeding situations was an increase from 32.2% to 38.1% for descending whistles (F[3,244] = 4.483, p = 0.004). Trills gradually increased from 1.8% to 7.3% toward the mating period (F[3,244] = 30.932, p less than 0.001). The proportion of trills, chugs, descending whistles, and other call types also varied with calling rate and light-dark conditions. Some pre-reproductive behaviours may occur in winter, but no call types of Weddell seals function solely in the breeding season.

Issued: 2012-02-15

Data time period: 2000-06-06 to 2002-12-11

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63.7,-67.4 63.7,-67.65 62.2,-67.65 62.2,-67.4 63.7,-67.4

62.95,-67.525

text: northlimit=-67.4; southlimit=-67.65; westlimit=62.2; eastLimit=63.7; projection=WGS84

Subjects
ANIMALS/VERTEBRATES | BIOLOGICAL CLASSIFICATION | Breeding | CARNIVORES | CONTINENT > ANTARCTICA | EARTH SCIENCE | FIELD INVESTIGATION | FIELD SURVEYS | GEOGRAPHIC REGION > POLAR | HYDROPHONES | Leptonychotes weddellii | MAMMALS | Non-breeding | OCEAN > SOUTHERN OCEAN | SEALS/SEA LIONS/WALRUSES | Weddel seal | biota | oceans | seasonal variation | underwater calls | vocal behaviour |

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AU-ANL:PEAU : http://nla.gov.au/nla.party-617536

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