Functional Morphology of the Ear of the Lesser Bamboo Rat (<i>Cannomys badius</i>)

Wannaprasert, Thanakul

doi:10.3106/041.041.0301

Cited by 6 publications

(5 citation statements)

References 41 publications

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“…which describes the ratio of the specific acoustic impedance at the oval window to the specific acoustic impedance at the eardrum [81,84,85] (although the interpretations do not change, we note that this is the inverse of the conventional ITR values (e.g. [21,86]). Box plots were used to show the median, minimum and maximum values of ITR for each lifestyle category, that is, semi-aquatic, terrestrial, semi-subterranean and subterranean.…”

Section: Impedance Transform Analysismentioning

confidence: 94%

“…Following previous studies, the ITR of the middle ear was calculated as

which describes the ratio of the specific acoustic impedance at the oval window to the specific acoustic impedance at the eardrum [ 81 , 84 , 85 ] (although the interpretations do not change, we note that this is the inverse of the conventional ITR values (e.g. [ 21 , 86 ]).…”

Section: Methodsmentioning

confidence: 99%

“…As low-frequency sound is better propagated than high-frequency sound through the dense medium of soil [11], subterranean mammals are known to depend more on low-frequency sound [5,12,13]. Previous studies have identified that subterranean mammals exhibit larger tympanic membranes and stapes footplates, loose connections between the malleus and tympanic bones and reduced middle ear muscles [2,12,[14][15][16][17][18][19][20][21]. However, previous functional studies have rarely considered the phylogenetic effect on middle ear morphology due to a lack of rigorous phylogenetic frameworks, and even distantly related taxa have often been compared.…”

Section: Introductionmentioning

confidence: 99%

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Into the dark: patterns of middle ear adaptations in subterranean eulipotyphlan mammals

Koyabu¹,

Hosojima²,

Endo³

2017

R. Soc. open sci.

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Evolution of the middle ear ossicles was a key innovation for mammals, enhancing the transmission of airborne sound. Radiation into various habitats from a terrestrial environment resulted in diversification of the auditory mechanisms among mammals. However, due to the paucity of phylogenetically controlled investigations, how middle ear traits have diversified with functional specialization remains unclear. In order to identify the respective patterns for various lifestyles and to gain insights into fossil forms, we employed a high-resolution tomography technique and compared the middle ear morphology of eulipotyphlan species (moles, shrews and hedgehogs), a group that has radiated into various environments, such as terrestrial, aquatic and subterranean habitats. Three-dimensional geometric morphometric analysis was conducted within a phylogenetically controlled framework. Quantitative shapes were found to strongly reflect the degree of subterranean lifestyle and weakly involve phylogeny. Our analyses demonstrate that subterranean adaptation should include a relatively shorter anterior process of the malleus, an enlarged incus, an enlarged stapes footplate and a reduction of the orbicular apophysis. These traits arguably allow improving low-frequency sound transmission at low frequencies and inhibiting the low-frequency noise which disturbs the subterranean animals in hearing airborne sounds.

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Section: Impedance Transform Analysismentioning

confidence: 94%

“…Following previous studies, the ITR of the middle ear was calculated as

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Into the dark: patterns of middle ear adaptations in subterranean eulipotyphlan mammals

Koyabu¹,

Hosojima²,

Endo³

2017

R. Soc. open sci.

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“…Rodents have evolved various anatomical and physiological auditory specializations that enhance low frequency detection and enable predator evasion, prey detection, and conspecific recognition (Basso et al, 2017;Pfaff et al, 2015;Pleštilová et al, 2016;Schleich & Vassallo, 2003;Wannaprasert, 2016). In fact, the relationship between the morphology of components of the auditory apparatus, such as the middle ear ossicles, cochlea, and bony labyrinth, and ecology has been studied before in numerous species (Bhagat et al, 2020;Kerber & Sánchez-Villagra, 2018;Mason, 2001Mason, , 2016Mason et al, 2010;Pfaff et al, 2015;Pleštilová et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Ecological correlates of the morphology of the auditory bulla in rodents: Application to the fossil record

Scarpitti

Calede

2021

Journal of Anatomy

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The fossil record provides a fantastic laboratory to explore the effects of past climatic and environmental changes on biodiversity and morphology (Barnosky et al., 2003;Blois & Hadly, 2009;Dietl & Flessa, 2011). Rodents are of particular interest because of their high taxonomic diversity during the Cenozoic (Samuels & Hopkins, 2017); their small body size, short breeding cycles, and ecological adaptations make them helpful indicators of environmental change (Chaline, 1977). One group of rodents that is expected to closely track the environment through time is fossorial rodents (e.g., Calede et al., 2011); a group of animals whose distribution and abundance is dependent on soil and environmental characteristics (e.g., Lazo-

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“…Improvements of non-visual sensory organs are critical to live in the darkness where available light is limited. Previous studies have identified that subterranean mammals tend to exhibit larger tympanic membrane, larger stapes footplate, loose connection between malleus and tympanic bone, and reduced middle ear muscles (Fleischer, 1978;Burda, 1979Burda, , 2006Burda et al, 1990Burda et al, , 1992Mason, 2001Mason, , 2003Mason, , 2006Pleštilová et al, 2016;Wannaprasert, 2016). Their morphology is argued to be related to hearing low-frequency sounds and reduced impedance performance (Burda et al, 1990(Burda et al, , 1992.…”

Section: Introductionmentioning

confidence: 99%

3D atlas and comparative osteology of the middle ear ossicles among Eulipotyphla (Mammalia, Placentalia).

Koyabu¹

2017

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Considerable morphological variations are found in the middle ear among mammals. Here I present a threedimensional atlas of the middle ear ossicles of eulipotyphlan mammals. This group has radiated into various environments as terrestrial, aquatic, and subterranean habitats independently in multiple lineages. Therefore, eulipotyphlans are an ideal group to explore the form-function relationship of the middle ear ossicles. This comparative atlas of hedgehogs, true shrews, water shrews, mole shrews, true moles, and shrew moles encourages future studies of the middle ear morphology of this diverse group.

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Functional Morphology of the Ear of the Lesser Bamboo Rat (Cannomys badius)

Cited by 6 publications

References 41 publications

Into the dark: patterns of middle ear adaptations in subterranean eulipotyphlan mammals

Into the dark: patterns of middle ear adaptations in subterranean eulipotyphlan mammals

Ecological correlates of the morphology of the auditory bulla in rodents: Application to the fossil record

3D atlas and comparative osteology of the middle ear ossicles among Eulipotyphla (Mammalia, Placentalia).

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