Repetition patterns in Weddell seal (Leptonychotes weddellii) underwater multiple element calls

Many vocalisations produced by Weddell seals (Leptonychotes weddellii) are made up of repeated individual distinct sounds (elements). Patterning of multiple element calls was examined during the breeding season at Casey and Davis, Antarctica. Element and interval durations were measured from 405 calls all greater than 3 elements in length. The duration of the calls (22 plus or minus 16.6s) did not seem to vary with an increasing number of elements (F4.404 = 1.83, p = 0.122) because element and interval durations decreased as the number of elements within a call increased. Underwater vocalisations showed seven distinct timing patterns of increasing, decreasing, or constant element and interval durations throughout the calls. One call type occurred with six rhythm patterns, although the majority exhibited only two rhythms. Some call types also displayed steady frequency changes as they progressed. Weddell seal multiple element calls are rhythmically repeated and thus the durations of the elements and intervals within a call occur in a regular manner. Rhythmical repetition used during vocal communication likely enhances the probability of a call being detected and has important implications for the extent to which the seals can successfully transmit information over long distances and during times of high level background noise.


See other metadata records and datasets associated with ASAC project 2122 (ASAC_2122) for further information.


The fields in this dataset are:


Tape/Site/File

Filename

Call Type

Total Number of Elements

Attribute

Frequency

Time

Casey

Davis

Simple

Identification info

Alternate title
Repetition patterns in Weddell seal (Leptonychotes weddellii) underwater multiple element calls
Date (Publication)
2004-11-11
Edition
1
Citation identifier
Dataset DOI

Title
Information and documentation - Digital object identifier system
Date (Publication)
2012-04-23
Citation identifier
ISO 26324:2012

Citation identifier
doi:10.4225/15/55EF8FC681CF3

Originator

Terhune, J.M.

Publisher

Australian Antarctic Data Centre

Principal investigator

TERHUNE, JOHN MOORE
Department of Biology
PO Box 5050
University of New Brunswick
Saint John
New Brunswick
E2L 4L5
Canada
Name
CAASM Metadata
Website
https://data.aad.gov.au/metadata/records/ASAC_2122-2

Status
Completed

Custodian

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)
Australian Antarctic Division
203 Channel Highway
Kingston
Tasmania
7050
Australia
Topic category
  • Biota
  • Oceans

Extent

N
S
E
W


N
S
E
W


Extent

Description
Temporal Coverage

Temporal extent

TimePeriod
1997-10-21 1997-12-01
Title
Repetition patterns in Weddell seal (Leptonychotes weddellii) underwater multiple element calls
Date (Publication)
2004
Citation identifier
116

Author

Moors, H.B. and Terhune, J.M.
Name
J. Acoust. Soc. Am.
Issue identification
2
Page
1261-1270
NASA/GCMD Earth Science Keywords
  • EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES
  • EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > MAMMALS
Keywords
  • ATTRIBUTE
  • CALL TYPE
  • CALLS
  • CASEY
  • DAVIS
  • ELEMENTS
  • FREQUENCY
  • LEPTONYCHOTES WEDDELLII
  • REPETITION
  • TIME
  • TRILLS
  • UNDERWATER
  • VOCALISATIONS
  • WEDDELL SEALS
NASA/GCMD Earth Science Keywords
  • HYDROPHONES
NASA/GCMD Earth Science Keywords
  • FIELD SURVEYS
NASA/GCMD Earth Science Keywords
  • AMD/AU
  • CEOS
  • AMD
NASA/GCMD Earth Science Keywords
  • CONTINENT > ANTARCTICA > Davis
  • CONTINENT > ANTARCTICA > Casey
  • GEOGRAPHIC REGION > POLAR

Resource constraints

Use limitation
This metadata record is publicly available.

Resource constraints

Access constraints
licence
Other constraints
These data are publicly available for download from the provided URL. A copy of the referenced paper is available for download to AAD staff only.

Resource constraints

File type
Portable Network Graphic
Linkage
Creative Commons by Attribution logo

Title
Attribution 4.0 International (CC BY 4.0)
Website
https://creativecommons.org/licenses/by/4.0/legalcode

Legal code for Creative Commons by Attribution 4.0 International license

Use constraints
licence
Other constraints
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_2122-2 when using these data.
Language
English
Character encoding
UTF8

Distribution Information

Distributor

Distributor

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)
Australian Antarctic Division
203 Channel Highway
Kingston
Tasmania
7050
Australia

Distributor

Fees
free
Planned available datetime
2004-11-11T00:00:00

Distributor

Fees
Free
Planned available datetime
2004-11-11T00:00:00
Units of distribution
kb
Transfer size
100
Distribution format
  • excel

Units of distribution
MB
Transfer size
3
Distribution format
  • PDF

OnLine resource
GET DATA

Download point for the data.

OnLine resource
PROJECT HOME PAGE

Public information for ASAC project 2122

OnLine resource
VIEW RELATED INFORMATION > PUBLICATIONS

Download point for the referenced publication - AAD only.

OnLine resource
VIEW RELATED INFORMATION

Citation reference for this metadata record and dataset

Resource lineage

Statement
Digital audio tape (DAT) recordings of Weddell seal underwater vocalisations were obtained near Weddell seal breeding groups during the 1997 breeding season. These recordings were made off the Eastern Antarctic coastline near two Australian Antarctic stations. Eight recordings (three from the same location) were made near Casey during 21 October - 30 November and seven recordings (each at a different location) were made near Davis during 8 November - 1 December, for a total of 15 recordings made at 12 locations. The recordings were made during a period of 24 h light, near groups of females with pups on the ice. The number, sex and age of the vocalising seals could not be determined, nor was it possible to determine the proximity of the seals to the hydrophone. Each recording lasted 1-2 hours. At each recording site, one hole was drilled through the sea-ice and the hydrophone was lowered approximately 2 m below the ice. Sony TCD-D3 DAT recorders (frequency response 0.002-20kHz plus or minus 1 dB) were used to make the recordings. At Casey, an ITC 6050C hydrophone (frequency response 0.002-30 kHz plus or minus 1 dB), with a built in preamplifier was connected to the Sony DAT recorder. At Davis, a Bruel and Kjaer 8100 hydrophone equipped with a Bruel and Kjaer 2635 charge preamplifier (frequency response 0.002-30 kHz plus or minus 1 dB) was used.
Hierarchy level
Dataset
Maintenance and update frequency
As needed
Maintenance note
2015-09-09 - record updated by Dave Connell. Basic updates.

Metadata

Metadata identifier
string/ASAC_2122-2

Language
English
Character encoding
UTF8

Author

TERHUNE, JOHN MOORE
Department of Biology
PO Box 5050
University of New Brunswick
Saint John
New Brunswick
E2L 4L5
Canada

Sponsor

Australian Antarctic Division

Owner

AADC

Type of resource

Resource scope
Dataset

Alternative metadata reference

Title
gov.nasa.gsfc.gcmd
Citation identifier
97dc311c-dc3c-4e76-8b46-0c8599979c89

Alternative metadata reference

Title
gov.nasa.gsfc.gcmd
Date (Last Revision)
2015-11-29T18:22:29

Identifier

Description
metadata.extraction_date

Alternative metadata reference

Title
gov.nasa.gsfc.gcmd
Citation identifier
8.6

Metadata linkage
http://data.aad.gov.au/metadata/records/ASAC_2122-2

Point of truth for the metadata record

Date info (Creation)
2002-05-29T00:00:00
Date info (Last Update)
2017-04-26

Metadata standard

Title
ISO 19115-3
Edition
2014
Other citation details
Version 1
Title
DIF to ISO 19115-1 Profile
 
 

Overviews

Spatial extent

N
S
E
W


N
S
E
W


Keywords


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