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Age-related differences in the acoustic characteristics of male leopard seals, Hydrurga leptonyx
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10.1121/1.2736976
/content/asa/journal/jasa/122/1/10.1121/1.2736976
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/1/10.1121/1.2736976

Figures

Image of FIG. 1.
FIG. 1.

Comparison of frequency of occurrence of broadcast calls (H, M, D, L, O) and variant calls (HV, MV, DV, LV) occurring in randomly chosen leopard seal vocalizations; 450 from adult seals and 450 from subadult seals.

Image of FIG. 2.
FIG. 2.

Sonagrams of a leopard seal high double trill (H) and examples of the seven types of variants of this call (HV).

Image of FIG. 3.
FIG. 3.

Sonagrams of a leopard seal medium single trill (M) and examples of the five types of variants of this call (MV).

Image of FIG. 4.
FIG. 4.

Sonagrams of a leopard seal low double trill (L) and hoot with a single trill (O) and examples of the eight types of variants of these low frequency calls (LVs).

Image of FIG. 5.
FIG. 5.

Leopard seal call repertoires recorded form different Antarctic areas; South Shetland Islands (SS) (Stirling and Siniff, 1979), Palmer Peninsula (PP), McMurdo Sound (MS) (Thomas and Golladay, 1995) and Prydz Bay (PB) (Rogers et al., 1995). Westward drift of the ice is the ice movement parallel to the bathymetry that hugs near the Antarctic continent where the eastward drift of the ice is further out from the Antarctic continent. Call double trill and double trill (), call single trill and descending trill (●), Call double trill (▴), Calls 6, 7, 8, 9, (★), and Call with a single low trill (∎).

Tables

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TABLE I.

Criteria used to distinguish whether a subadult’s call was a broadcast call or a variant type call.

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TABLE II.

Number of broadcast calls analyzed per seal: high double trills (H), medium single trills (M), low descending trills (D), low double trills (L), and hoots with a single trill (O); and the number of vocalizing bouts and periods analysed per seal.

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TABLE III.

ANOVA comparison between acoustic characteristics measured from the five adult and five sub-adult male leopard seal calls, data from variant calls are not included.a

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TABLE IV.

ANOVA comparison between duration and number of units in vocalizing and inter-vocalizing periods produced by adult and sub-adult male leopard seals (an asterisk denotes significant at 0.05 level).

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TABLE V.

ANOVA comparison between calling rates in recordings from adult and sub-adult male leopard seals (an asterisk denotes significant at 0.05 level).

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/content/asa/journal/jasa/122/1/10.1121/1.2736976
2007-07-01
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Age-related differences in the acoustic characteristics of male leopard seals, Hydrurga leptonyx
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/1/10.1121/1.2736976
10.1121/1.2736976
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