Data

Weddell seals do not lengthen calls in response to conspecific masking

Australian Antarctic Division
Terhune, J.M. ; TERHUNE, JOHN MOORE
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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=http://data.aad.gov.au/metadata/ASAC_1132_pulse_repetition&rft.title=Weddell seals do not lengthen calls in response to conspecific masking&rft.identifier=http://data.aad.gov.au/metadata/ASAC_1132_pulse_repetition&rft.publisher=Australian Antarctic Data Centre&rft.description=Some mammalian and avian species alter their vocal communication signals to reduce masking by background noises (including conspecific calls). A preliminary study suggested that Weddell seals (Leptonychotes weddellii) increase the durations of some underwater call types when overlapped by another calling seal. The present study examined the durations and overlapping sequences of Weddell seal calls recorded in Eastern Antarctica. The calling rate, call type (13 major categories), total duration, numbers of elements per call, and overlapping order of 100-200 consecutive calls per recording location were measured. In response to increased conspecific calling rates, the call durations and numbers of elements (within repeated-element call types) did not change or became shorter. Calls that were not overlapped were 3.8 plus or minus 6.1 s long, the first call in a series of overlapped calls was 14.4 plus or minus 15.7 s and subsequent calls in an overlapping series were 6.5 plus or minus 10.3 s. The mean durations of non-overlapped and overlapped calls matched random distributions. Weddell seals do not appear to be adjusting the durations or timing of their calls to purposefully avoid masking each others' calls. The longer a call is, the more likely it is to overlap another call by chance. An implication of this is that Weddell seals may not have the behavioural flexibility to reduce masking by altering the temporal aspects of their calls or calling behaviours as background noises (natural and from shipping) increase.Progress Code: completed&rft.creator=Terhune, J.M. &rft.creator=TERHUNE, JOHN MOORE &rft.date=2016&rft.coverage=westlimit=59.06250; southlimit=-69.28726; eastlimit=82.61719; northlimit=-64.92354&rft.coverage=westlimit=59.06250; southlimit=-69.28726; eastlimit=82.61719; northlimit=-64.92354&rft_rights=None&rft_rights=Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/legalcode&rft_rights=None 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_pulse_repetition when using these data.&rft_rights=This metadata record is publicly available.&rft_subject=biota&rft_subject=oceans&rft_subject=EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > MAMMALS > CARNIVORES > SEALS/SEA LIONS/WALRUSES&rft_subject=Weddell Seal&rft_subject=Leptonychotes weddellii&rft_subject=vocalisation&rft_subject=HYDROPHONES&rft_subject=FIELD SURVEYS&rft_subject=AMD/AU&rft_subject=AMD&rft_subject=CEOS&rft_subject=GEOGRAPHIC REGION > POLAR&rft.type=dataset&rft.language=English Access the data
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Some mammalian and avian species alter their vocal communication signals to reduce masking by background noises (including conspecific calls). A preliminary study suggested that Weddell seals (Leptonychotes weddellii) increase the durations of some underwater call types when overlapped by another calling seal. The present study examined the durations and overlapping sequences of Weddell seal calls recorded in Eastern Antarctica. The calling rate, call type (13 major categories), total duration, numbers of elements per call, and overlapping order of 100-200 consecutive calls per recording location were measured. In response to increased conspecific calling rates, the call durations and numbers of elements (within repeated-element call types) did not change or became shorter. Calls that were not overlapped were 3.8 plus or minus 6.1 s long, the first call in a series of overlapped calls was 14.4 plus or minus 15.7 s and subsequent calls in an overlapping series were 6.5 plus or minus 10.3 s. The mean durations of non-overlapped and overlapped calls matched random distributions. Weddell seals do not appear to be adjusting the durations or timing of their calls to purposefully avoid masking each others' calls. The longer a call is, the more likely it is to overlap another call by chance. An implication of this is that Weddell seals may not have the behavioural flexibility to reduce masking by altering the temporal aspects of their calls or calling behaviours as background noises (natural and from shipping) increase.

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Progress Code: completed

Notes

Purpose
The data were used in the two sets of analyses of Weddell seal underwater calls that are presented in Terhune, J.M. 2016. Weddell seals do not lengthen calls in response to conspecific masking. Bioacoustics 25: 75-88.

Data time period: 1991-10-01 to 2002-12-20

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82.61719,-64.92354 82.61719,-69.28726 59.0625,-69.28726 59.0625,-64.92354 82.61719,-64.92354

70.839845,-67.1054

text: westlimit=59.06250; southlimit=-69.28726; eastlimit=82.61719; northlimit=-64.92354

Subjects
AMD | AMD/AU | CEOS | EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > MAMMALS > CARNIVORES > SEALS/SEA LIONS/WALRUSES | FIELD SURVEYS | GEOGRAPHIC REGION > POLAR | HYDROPHONES | Leptonychotes weddellii | Weddell Seal | biota | oceans | vocalisation |

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Download point for the data (GET DATA)

url : http://data.aad.gov.au/aadc/portal/download_file.cfm?file_id=4580

Public information for ASAC project 1132 (PROJECT HOME PAGE)

url : https://projects.aad.gov.au/search_projects_results.cfm?project_no=AAS_1132

Download point for the data - papers - AAD Staff Only (VIEW RELATED INFORMATION > PUBLICATIONS)

url : http://data.aad.gov.au/aadc/portal/download_file.cfm?file_id=4579

Citation reference for this metadata record and dataset. (VIEW RELATED INFORMATION)

url : https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_1132_pulse_repetition

Identifiers
  • global : ASAC_1132_pulse_repetition
ACN 633 798 857