Weddell seals do not lengthen calls in response to conspecific masking
Progress Code: completed 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. Some mammalian and avian species alter their voca...
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ftands:oai:ands.org.au::2820078 2023-12-03T10:13:41+01:00 Weddell seals do not lengthen calls in response to conspecific masking Spatial: westlimit=59.0625; southlimit=-69.28726; eastlimit=82.61719; northlimit=-64.92354 Temporal: From 1991-10-01 to 2002-12-20 https://researchdata.edu.au/weddell-seals-lengthen-conspecific-masking/2820078 unknown Australian Ocean Data Network https://researchdata.edu.au/weddell-seals-lengthen-conspecific-masking/2820078 ASAC_1132_pulse_repetition AU/AADC > Australian Antarctic Data Centre, Australia biota oceans EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > MAMMALS > CARNIVORES > SEALS/SEA LIONS/WALRUSES Weddell Seal Leptonychotes weddellii vocalisation HYDROPHONES FIELD SURVEYS AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR dataset ftands 2023-11-06T23:51:20Z Progress Code: completed 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. 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. Dataset Antarc* Antarctica Weddell Seal Weddell Seals walrus* Research Data Australia (Australian National Data Service - ANDS) Weddell |
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 > MAMMALS > CARNIVORES > SEALS/SEA LIONS/WALRUSES Weddell Seal Leptonychotes weddellii vocalisation HYDROPHONES FIELD SURVEYS AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR |
spellingShingle |
biota oceans EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > MAMMALS > CARNIVORES > SEALS/SEA LIONS/WALRUSES Weddell Seal Leptonychotes weddellii vocalisation HYDROPHONES FIELD SURVEYS AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR Weddell seals do not lengthen calls in response to conspecific masking |
topic_facet |
biota oceans EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > MAMMALS > CARNIVORES > SEALS/SEA LIONS/WALRUSES Weddell Seal Leptonychotes weddellii vocalisation HYDROPHONES FIELD SURVEYS AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR |
description |
Progress Code: completed 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. 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. |
format |
Dataset |
title |
Weddell seals do not lengthen calls in response to conspecific masking |
title_short |
Weddell seals do not lengthen calls in response to conspecific masking |
title_full |
Weddell seals do not lengthen calls in response to conspecific masking |
title_fullStr |
Weddell seals do not lengthen calls in response to conspecific masking |
title_full_unstemmed |
Weddell seals do not lengthen calls in response to conspecific masking |
title_sort |
weddell seals do not lengthen calls in response to conspecific masking |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.edu.au/weddell-seals-lengthen-conspecific-masking/2820078 |
op_coverage |
Spatial: westlimit=59.0625; southlimit=-69.28726; eastlimit=82.61719; northlimit=-64.92354 Temporal: From 1991-10-01 to 2002-12-20 |
geographic |
Weddell |
geographic_facet |
Weddell |
genre |
Antarc* Antarctica Weddell Seal Weddell Seals walrus* |
genre_facet |
Antarc* Antarctica Weddell Seal Weddell Seals walrus* |
op_source |
AU/AADC > Australian Antarctic Data Centre, Australia |
op_relation |
https://researchdata.edu.au/weddell-seals-lengthen-conspecific-masking/2820078 ASAC_1132_pulse_repetition |
_version_ |
1784260534470705152 |