title: Comparative assessment of amphibious hearing in pinnipeds.
abstract: Auditory sensitivity in pinnipeds is influenced by the need to balance efficient sound detection in two vastly different physical environments. Previous comparisons between aerial and underwater hearing capabilities have considered media-dependent differences relative to auditory anatomy, acoustic communication, ecology, and amphibious life history. New data for several species, including recently published audiograms and previously unreported measurements obtained in quiet conditions, necessitate a re-evaluation of amphibious hearing in pinnipeds. Several findings related to underwater hearing are consistent with earlier assessments, including an expanded frequency range of best hearing in true seals that spans at least six octaves. The most notable new results indicate markedly better aerial sensitivity in two seals (Phoca vitulina and Mirounga angustirostris) and one sea lion (Zalophus californianus), likely attributable to improved ambient noise control in test enclosures. An updated comparative analysis alters conventional views and demonstrates that these amphibious pinnipeds have not necessarily sacrificed aerial hearing capabilities in favor of enhanced underwater sound reception. Despite possessing underwater hearing that is nearly as sensitive as fully aquatic cetaceans and sirenians, many seals and sea lions have retained acute aerial hearing capabilities rivaling those of terrestrial carnivores.
authors.affiliation: Long Marine Laboratory, Institute of Marine Sciences, University of California Santa Cruz, Santa Cruz, CA 95060, USA. coll@ucsc.edu
authors.forename: Colleen
authors.initials: C
authors.lastname: Reichmuth
authors.forename: Marla M
authors.initials: MM
authors.lastname: Holt
authors.forename: Jason
authors.initials: J
authors.lastname: Mulsow
authors.forename: Jillian M
authors.initials: JM
authors.lastname: Sills
authors.forename: Brandon L
authors.initials: BL
authors.lastname: Southall
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold; D010872:Caniformia / Q000502:physiology* / Q000523:psychology; D017753:Ecosystem; D005260:Female; D006309:Hearing; D008297:Male; D009792:Oceans and Seas; D011571:Psychoacoustics; D013045:Species Specificity
references.citation: Psychol Bull. 1981 Mar;89(2):288-307
references.pmid: 7232612
references.citation: J Acoust Soc Am. 2010 Apr;127(4):2692-701
references.pmid: 20370049
references.citation: J Acoust Soc Am. 2012 May;131(5):4182-7
references.pmid: 22559389
references.citation: J Acoust Soc Am. 2002 Jan;111(1 Pt 1):447-56
references.pmid: 11831819
references.citation: Am J Psychol. 1962 Sep;75:485-91
references.pmid: 13881416
references.citation: J Acoust Soc Am. 1998 Apr;103(4):2216-28
references.pmid: 9566340
references.citation: Adv Mar Biol. 2012;63:197-246
references.pmid: 22877613
references.citation: J Acoust Soc Am. 2007 Jul;122(1):606-14
references.pmid: 17614517
references.citation: J Acoust Soc Am. 2008 Jul;124(1):625-33
references.pmid: 18647004
references.citation: PLoS One. 2012;7(5):e36728
references.pmid: 22615801
references.citation: J Acoust Soc Am. 2009 Feb;125(2):1222-9
references.pmid: 19206895
references.citation: J Acoust Soc Am. 2003 Jan;113(1):629-37
references.pmid: 12558298
references.citation: J Acoust Soc Am. 2006 Dec;120(6):3463-6
references.pmid: 17225374
references.citation: J Exp Anal Behav. 1972 May;17(3):339-50
references.pmid: 5033891
references.citation: Hear Res. 1985;19(1):85-8
references.pmid: 4066516
references.citation: J Acoust Soc Am. 1999 Jun;105(6):3575-83
references.pmid: 10380675
references.citation: J Acoust Soc Am. 2008 Jul;124(1):44-7
references.pmid: 18646953
references.citation: J Acoust Soc Am. 1974 Apr;55(4):845-8
references.pmid: 4833081
references.citation: J Acoust Soc Am. 1974 Oct;56(4):1248-51
references.pmid: 4424866
references.citation: Can J Zool. 1971 Mar;49(3):385-90
references.pmid: 5575662
references.citation: J Acoust Soc Am. 2002 Jul;112(1):329-33
references.pmid: 12141359
references.citation: J Acoust Soc Am. 2011 Apr;129(4):2298-306
references.pmid: 21476685
references.citation: J Acoust Soc Am. 2012 Oct;132(4):2147-50
references.pmid: 23039406
references.citation: J Acoust Soc Am. 2005 Jan;117(1):436-41
references.pmid: 15704436
references.citation: Can J Zool. 1972 May;50(5):565-9
references.pmid: 5027182
references.citation: J Acoust Soc Am. 1988 Sep;84(3):936-40
references.pmid: 3183211
references.citation: J Acoust Soc Am. 2000 Sep;108(3 Pt 1):1322-6
references.pmid: 11008832
references.citation: J Acoust Soc Am. 2003 Sep;114(3):1660-6
references.pmid: 14514219
references.citation: J Acoust Soc Am. 2000 Apr;107(4):2256-64
references.pmid: 10790051
references.citation: Hear Res. 1986;24(3):269-75
references.pmid: 3793642
references.citation: J Acoust Soc Am. 1978 May;63(5):1501-8
references.pmid: 690329
references.citation: J Acoust Soc Am. 2002 Jul;112(1):334-44
references.pmid: 12141360