title: Postnatal ontogeny of the cochlea and flight ability in Jamaican fruit bats (Phyllostomidae) with implications for the evolution of echolocation.
abstract: Recent evidence has shown that the developmental emergence of echolocation calls in young bats follow an independent developmental pathway from other vocalizations and that adult-like echolocation call structure significantly precedes flight ability. These data in combination with new insights into the echolocation ability of some shrews suggest that the evolution of echolocation in bats may involve inheritance of a primitive sonar system that was modified to its current state, rather than the ad hoc evolution of echolocation in the earliest bats. Because the cochlea is crucial in the sensation of echoes returning from sonar pulses, we tracked changes in cochlear morphology during development that included the basilar membrane (BM) and secondary spiral lamina (SSL) along the length of the cochlea in relation to stages of flight ability in young bats. Our data show that the morphological prerequisite for sonar sensitivity of the cochlea significantly precedes the onset of flight in young bats and, in fact, development of this prerequisite is complete before parturition. In addition, there were no discernible changes in cochlear morphology with stages of flight development, demonstrating temporal asymmetry between the development of morphology associated with echo-pulse return sensitivity and volancy. These data further corroborate and support the hypothesis that adaptations for sonar and echolocation evolved before flight in mammals.
authors.affiliation: Ohio University, Chillicothe, OH, USA.
authors.forename: Richard T
authors.initials: RT
authors.lastname: Carter
authors.forename: Rick A
authors.initials: RA
authors.lastname: Adams
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D005075:Biological Evolution; D002685:Chiroptera / Q000033:anatomy & histology*; D003051:Cochlea / Q000033:anatomy & histology*; D004455:Echolocation / Q000502:physiology*; D005426:Flight, Animal / Q000502:physiology*
keywords: Artibeus jamaicensis; bats; cochlea; evolution; ontogeny
references.citation: Anat Rec (Hoboken). 2014 Jul;297(7):1270-7
references.pmid: 24778087
references.citation: J Morphol. 1995 Jul;225(1):107-123
references.pmid: 29865318
references.citation: Nature. 2000 Jan 13;403(6766):188-92
references.pmid: 10646602
references.citation: Anim Behav. 1997 Jul;54(1):131-41
references.pmid: 9268443
references.citation: Mol Biol Evol. 2005 Sep;22(9):1869-86
references.pmid: 15930153
references.citation: Proc Natl Acad Sci U S A. 2008 Sep 16;105(37):13959-64
references.pmid: 18776049
references.citation: Proc Natl Acad Sci U S A. 1995 Jan 3;92(1):276-9
references.pmid: 7816832
references.citation: J Exp Zool. 1964 Jun;156:19-37
references.pmid: 14189919
references.citation: J Exp Biol. 1974 Oct;61(2):379-99
references.pmid: 4443734
references.citation: J Morphol. 1967 Mar;121(3):241-54
references.pmid: 5341488
references.citation: J Mammal. 1978 Nov;59(4):852-4
references.pmid: 750639
references.citation: Trends Ecol Evol. 1997 Feb;12(2):53-8
references.pmid: 21237972
references.citation: Trends Ecol Evol. 2006 Mar;21(3):149-56
references.pmid: 16701491
references.citation: Hear Res. 1991 Nov;56(1-2):122-32
references.pmid: 1769907
references.citation: J Exp Biol. 1977 Aug;69:207-32
references.pmid: 908910
references.citation: Front Zool. 2013 Jan 30;10(1):2
references.pmid: 23360746
references.citation: Naturwissenschaften. 1997 Jan;84(1):9-16
references.pmid: 9050002
references.citation: Nature. 2010 Feb 18;463(7283):939-42
references.pmid: 20098413
references.citation: Nat Commun. 2012 Apr 10;3:773
references.pmid: 22491321
references.citation: Hear Res. 1994 Jun 1;76(1-2):133-46
references.pmid: 7928706
references.citation: Naturwissenschaften. 1996 Feb;83(2):89-91
references.pmid: 8668230
references.citation: Hear Res. 2003 Oct;184(1-2):113-22
references.pmid: 14553909
references.citation: Hear Res. 2011 Mar;273(1-2):89-99
references.pmid: 20630478
references.citation: Science. 1984 Aug 17;225(4663):741-3
references.pmid: 6463651
references.citation: Curr Biol. 2010 Jan 26;20(2):R55-6
references.pmid: 20129037
references.citation: Nature. 2008 Feb 14;451(7180):818-21
references.pmid: 18270539
references.citation: Curr Biol. 2010 Jan 26;20(2):R62-4
references.pmid: 20129041
references.citation: Biol Lett. 2009 Oct 23;5(5):593-6
references.pmid: 19535367
references.citation: J Morphol. 1993 Oct;218(1):85-98
references.pmid: 8230237
references.citation: Hear Res. 1994 Jan;72(1-2):73-80
references.pmid: 8150747
references.citation: J Mammal. 1975 Feb;56(1):15-29
references.pmid: 1113037
references.citation: Nature. 2013 Oct 10;502(7470):228-31
references.pmid: 24005325
references.citation: Nature. 2010 Aug 19;466(7309):E8; discussion E9
references.pmid: 20724993