Different on the inside: extreme swimbladder sexual dimorphism in the South Asian torrent minnows

Conway, Kevin W.; Britz, Ralf; Siegel, Dustin S.

doi:10.1098/rsbl.2014.0348

Cited by 10 publications

(8 citation statements)

References 16 publications

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“…). Drumming muscles are rare in cypriniforms, but have been found in Sundadanio (Conway and Britz, ) and Psilorhynchus (Conway et al, ), although the drumming apparatus in the latter two is quite different from that of D. dracula and does not include a drumming cartilage. In addition, male D. dracula have several areas of their skeleton affected by hyperossification, which often accompanies miniaturization in vertebrates, as also pointed out by Hanken ().…”

Section: Discussionmentioning

confidence: 99%

Danionella dracula, an escape from the cypriniform Bauplan via developmental truncation?

Britz

Conway

2015

Journal of Morphology

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We provide a detailed account of the osteology of the miniature Asian freshwater cyprinid fish Danionella dracula. The skeleton of D. dracula shows a high degree of developmental truncation when compared to most other cyprinids, including its close relative the zebrafish Danio rerio. Sixty-one bones, parts thereof or cartilages present in most other cyprinids are missing in D. dracula. This impressive organism-wide case of progenesis renders it one of the most developmentally truncated bony fishes or even vertebrates. Danionella dracula lacks six of the eight unique synapomorphies that define the order Cypriniformes and has, thus, departed from the cypriniform Bauplan more dramatically than any other member of this group. This escape from one of the most successful Baupläne among bony fishes may have been facilitated by the organism-wide progenesis encountered in D. dracula. By returning in its skeletal structure to the early developmental condition of other cypriniforms, D. dracula may have managed to overcome the evolutionary constraints associated with this Bauplan and opened up new evolutionary avenues that enabled it to evolve a number of striking morphological novelties, including its tooth-like odontoid processes and a complex drumming apparatus.

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Section: Discussionmentioning

confidence: 99%

Danionella dracula, an escape from the cypriniform Bauplan via developmental truncation?

Britz

Conway

2015

Journal of Morphology

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“…Previous studies have reported sexual dimorphisms in the swim bladders of South Asian torrent minnows (Psilorhynchidae; Conway, Britz, & Siegel, ), Atlantic croakers (Sciaenidae; Hill, Fine, & Musick, ), oyster toadfish (Batrachoididae; Fine et al, ) along with several species of cusk eels (Ophidiidae) with implications for sound production (Courtenay, ; Kéver et al, ; Rose, ). While Bass and Marchaterre () reported overall size differences in gross dissections of the swim bladders of plainfin midshipman across sexual phenotypes, no study has yet provided evidence for functional differences in swim bladders between the sexes, nor between alternative sexual phenotypes of a given sex as it relates to sound reception.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have reported sexual dimorphisms in the swim bladders of South Asian torrent minnows (Psilorhynchidae;Conway, Britz, & Siegel, 2014), Atlantic croakers (Sciaenidae;Hill, Fine, & Musick, 1987), oyster toadfish (Batrachoididae;Fine et al, 1990) along withFIG URE 4 Representative computerized tomography (CT) scans of a female, type I and II male that show differences in swim bladder shape and relative proximity of the swim bladder to the inner ear otoliths of Porichthys notatus. The largest otoliths reside in saccule (SO), the main end organ of hearing in this species, while ventro-caudal to the saccular otoliths are the otoliths of lagena (LO), also a putative midshipman auditory end organ, and then medial-anterior to the saccular otoliths are the otoliths of the utricle (UO), a putative vestibular and auditory end organ.…”

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confidence: 99%

Intra‐ and Intersexual swim bladder dimorphisms in the plainfin midshipman fish (Porichthys notatus): Implications of swim bladder proximity to the inner ear for sound pressure detection

Mohr

Whitchurch

Anderson

et al. 2017

Journal of Morphology

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The plainfin midshipman fish, Porichthys notatus, is a nocturnal marine teleost that uses social acoustic signals for communication during the breeding season. Nesting type I males produce multiharmonic advertisement calls by contracting their swim bladder sonic muscles to attract females for courtship and spawning while subsequently attracting cuckholding type II males. Here, we report intra- and intersexual dimorphisms of the swim bladder in a vocal teleost fish and detail the swim bladder dimorphisms in the three sexual phenotypes (females, type I and II males) of plainfin midshipman fish. Micro-computerized tomography revealed that females and type II males have prominent, horn-like rostral swim bladder extensions that project toward the inner ear end organs (saccule, lagena, and utricle). The rostral swim bladder extensions were longer, and the distance between these swim bladder extensions and each inner-ear end organ type was significantly shorter in both females and type II males compared to that in type I males. Our results revealed that the normalized swim bladder length of females and type II males was longer than that in type I males while there was no difference in normalized swim bladder width among the three sexual phenotypes. We predict that these intrasexual and intersexual differences in swim bladder morphology among midshipman sexual phenotypes will afford greater sound pressure sensitivity and higher frequency detection in females and type II males and facilitate the detection and localization of conspecifics in shallow water environments, like those in which midshipman breed and nest.

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“…In non-ophidiiform teleosts, sexual dimorphism in the sound production apparatus seems to be commonly related to the size of sonic muscles and swimbladder (Kratochvil, 1980;Fine et al, 1990;Brantley et al, 1993) or the absence or presence of sonic muscles (Hill et al, 1987;Tellechea and Norbis, 2012). However, the recent work of Conway et al (Conway et al, 2014) highlighted extreme (shape and size) internal dimorphisms in some minnows, which suggest that pronounced intersexual differences may have been missed, even in well-studied groups. In the past, sex-related differences in the soundproduction apparatus (and sounds) of carapids may have been overlooked because they are inconspicuous, especially when compared with the sexual dimorphism observed in the sister family Ophidiidae (Rose, 1961;Courtenay, 1971;Kéver et al, 2012).…”

Section: Introductionmentioning

confidence: 98%

Sound production inOnuxodon fowleri(Carapidae) and its amplification by the host shell

Kéver¹,

Colleye²,

Lugli

et al. 2014

Journal of Experimental Biology

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Onuxodon species are well known for living inside pearl oysters. As in other carapids, their anatomy highlights their ability to make sounds but sound production has never been documented in Onuxodon. This paper describes sound production in Onuxodon fowleri as well as the anatomy of the sound production apparatus. Single-pulsed sounds and multiple-pulsed sounds that sometimes last more than 3 s were recorded in the field and in captivity (Makemo Island, French Polynesia). These pulses are characterized by a broadband frequency spectrum from 100 to 1000 Hz. Onuxodon fowleri is mainly characterized by its ability to modulate the pulse period, meaning that this species can produce pulsed sounds and tonal-like sounds using the same mechanism. In addition, the sound can be remarkably amplified by the shell cavity (peak gain can exceed 10 dB for some frequencies). The sonic apparatus of O. fowleri is characterized by a rocker bone in front of the swimbladder, modified vertebrae and epineurals, and two pairs of sonic muscles, one of which (primary sonic muscle) inserts on the rocker bone. The latter structure, which is absent in other carapid genera, appears to be sexually dimorphic suggesting differences in sound production in males and females. Sound production in O. fowleri could be an example of adaptation where an animal exploits features of its environment to enhance communication.

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Different on the inside: extreme swimbladder sexual dimorphism in the South Asian torrent minnows

Cited by 10 publications

References 16 publications

Danionella dracula, an escape from the cypriniform Bauplan via developmental truncation?

Danionella dracula, an escape from the cypriniform Bauplan via developmental truncation?

Intra‐ and Intersexual swim bladder dimorphisms in the plainfin midshipman fish (Porichthys notatus): Implications of swim bladder proximity to the inner ear for sound pressure detection

Sound production inOnuxodon fowleri(Carapidae) and its amplification by the host shell

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