Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Modeling whale audiograms: effects of bone mass on high-frequency hearing
Autore:
Hemila, S; Nummela, S; Reuter, T;
Indirizzi:
Univ Helsinki, Dept Systemat & Ecol, Zool Lab, FIN-00014 Helsinki, FinlandUniv Helsinki Helsinki Finland FIN-00014 ab, FIN-00014 Helsinki, Finland Helsinki Univ Technol, Phys Lab, FIN-02150 Espoo, Finland Helsinki Univ Technol Espoo Finland FIN-02150 , FIN-02150 Espoo, Finland
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 151, anno: 2001,
pagine: 221 - 226
SICI:
0378-5955(200101)151:1-2<221:MWAEOB>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
MIDDLE-EAR; ORCINUS-ORCA; IMPEDANCE;
Keywords:
middle ear; high-frequency hearing; isometry; audiogram; mass inertia; killer whale; odontocete hearing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Nummela, S Univ Helsinki, Dept Systemat & Ecol, Zool Lab, POB 17, FIN-00014 Helsinki,Finland Univ Helsinki POB 17 Helsinki Finland FIN-00014 lsinki,Finland
Citazione:
S. Hemila et al., "Modeling whale audiograms: effects of bone mass on high-frequency hearing", HEARING RES, 151(1-2), 2001, pp. 221-226

Abstract

In a previous paper (Hemila et al., Hear. Res. 133 (1999) 82-97) we have presented a mechanical model, based on species-specific anatomical data, forthe toothed whale middle ear. For five odontocete species of six we found that the model quite well predicted published behavioral audiograms. Here we report that new published data indicate that the audiogram of the sixth and deviating species, the killer whale Orcinus orca, was from a specimen with deficient high-frequency hearing. A new published killer whale audiogramis similar to other odontocete audiograms and does fit our four-bone model. With certain general conditions, a model with isometric (middle) ears results in uniform audiograms for different species, when presented in a log-log plot; with larger ears the audiogram curves are just moved towards lowerfrequencies. The audiograms coincide in case all frequencies are scaled bya Factor 1/3 rootm, where m is the mass of the ear ossicles. Odontocete ears are isometric enough to show that the corresponding audiograms are indeed similar after such mass scaling. Specifically, this scaling factor can beused to predict the high-frequency hearing limits of all odontocete species. Our anatomical data and models support the notion that ossicular mass isa crucial factor limiting high-frequency hearing in both terrestrial mammals and toothed whales. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 08:04:09