A proposed mechanism for the observed ontogenetic improvement in the hearing ability of hapuka (Polyprion oxygeneios)

Caiger, Paul E.; Montgomery, John C.; Bruce, Michael P.; Lu, Jun; Radford, Craig A.

doi:10.1007/s00359-013-0820-z

Cited by 9 publications

(9 citation statements)

References 39 publications

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“…This technique is attractive to researchers because it is a fairly simple way to determine what sounds fi sh can detect and AEP can be quite useful in a comparative context to test how sound detection changes ontogenetically (e.g. Kenyon 1996 ;Higgs et al 2002Higgs et al , 2003Caiger et al 2013 ), how experimental manipulations can affect detection (e.g. Yan et al 2000 ;Radford et al 2012Radford et al , 2013Higgs and Radford 2013 ), and to examine the bandwidth of detection between different species of interest (e.g.…”

Section: "Hearing" As a Physiological Responsementioning

confidence: 99%

The Potential Overlapping Roles of the Ear and Lateral Line in Driving “Acoustic” Responses

Higgs

Radford

2016

Advances in Experimental Medicine and Biology

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Examination of fish responses to sound stimuli has a rich and varied history but it is not always clear when responses are true measures of hearing or the lateral-line. The central innervation of auditory and lateral-line sensory afferents lie in close proximity in the brainstem and both sets of receptors are, at heart, hair cell-based particle motion detectors. While it is possible to separately measure physiological activity of these two receptor subtypes, many studies of fish "hearing" use whole brain potentials or behavioural assays in complex sound fields where it is not possible to distinguish inputs. We argue here that, as often measured, what is thought of as fish "hearing" is often a multisensory response of both auditory and lateral line receptors. We also argue that in many situations where fish use sound stimuli, the behaviour is also an integrative response of both systems, due to the often close proximity of fish during sound communication. We end with a set of recommendations for better understanding the separate and combined roles of ear and lateral-line hair cells as well as an acknowledgment of the seminal and continuing contributions of Arthur N. Popper and Richard R. Fay to this field.

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Section: "Hearing" As a Physiological Responsementioning

confidence: 99%

The Potential Overlapping Roles of the Ear and Lateral Line in Driving “Acoustic” Responses

Higgs

Radford

2016

Advances in Experimental Medicine and Biology

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“…; 2a-b, otophysic connection via Weberian apparatus; 3a, anterior part of swim bladder extension penetrates skull but is separated from the main swim bladder; 3b, suprabranchial chamber close to ear. For morphological details in Polyprion oxygeneios see Caiger et al (2013). Additional laterophysic connections: 1b-c, 2b.…”

Section: Figure 4 | Continuedmentioning

confidence: 99%

Diversity in Fish Auditory Systems: One of the Riddles of Sensory Biology

2016

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An astonishing diversity of inner ears and accessory hearing structures (AHS) that can enhance hearing has evolved in fishes. Inner ears mainly differ in the size of the otolith end organs, the shape and orientation of the sensory epithelia, and the orientation patterns of ciliary bundles of sensory hair cells. Despite our profound morphological knowledge of inner ear variation, two main questions remain widely unanswered. (i) What selective forces and/or constraints led to the evolution of this inner ear diversity? (ii) How is the morphological variability linked to hearing abilities? Improved hearing is mainly based on the ability of many fish species to transmit oscillations of swim bladder walls or other gas-filled bladders to the inner ears. Swim bladders may be linked to the inner ears via a chain of ossicles (in otophysans), anterior extensions (e.g., some cichlids, squirrelfishes), or the gas bladders may touch the inner ears directly (labyrinth fishes). Studies on catfishes and cichlids demonstrate that larger swim bladders and more pronounced linkages to the inner ears positively affect both auditory sensitivities and the detectable frequency range, but lack of a connection does not exclude hearing enhancement. This diversity of auditory structures and hearing abilities is one of the main riddles in fish bioacoustics research. Hearing enhancement might have evolved to facilitate intraspecific acoustic communication. A comparison of sound-producing species, however, indicates that acoustic communication is widespread in taxa lacking AHS. Eco-acoustical constraints are a more likely explanation for the diversity in fish hearing sensitivities. Low ambient noise levels may have facilitated the evolution of AHS, enabling fish to detect low-level abiotic noise and sounds from con-and heterosopecifics, including predators and prey. Aquatic habitats differ in ambient noise regimes, and preliminary data indicate that hearing sensitivities of fishes vary accordingly.

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“…1 µPa during ontogeny and the small juveniles were unable to detect frequencies higher than 2-3 kHz, whereas large juveniles showed best sensitivity to higher frequencies of 4-6 kHz. Recently, Caiger et al (2013) described an ontogenetic enhancement of auditory abilities in the hapuka (Polyprion oxygeneios) based on AEP measurements, i.e. a 22× increase in auditory sensitivity and an expansion of the auditory bandwidth (from the maximum 800 Hz to 1000 Hz) from larvae to the juvenile stage.…”

Section: Ontogenetic Development Of Peripheral Auditory Sensitivitymentioning

confidence: 99%

Vocal differentiation parallels development of auditory saccular sensitivity in a highly soniferous fish

Vasconcelos

Alderks

Ramos

et al. 2015

Journal of Experimental Biology

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Vocal differentiation is widely documented in birds and mammals but has been poorly investigated in other vertebrates, including fish, which represent the oldest extant vertebrate group. Neural circuitry controlling vocal behaviour is thought to have evolved from conserved brain areas that originated in fish, making this taxon key to understanding the evolution and development of the vertebrate vocal-auditory systems. This study examines ontogenetic changes in the vocal repertoire and whether vocal differentiation parallels auditory development in the Lusitanian toadfish Halobatrachus didactylus (Batrachoididae). This species exhibits a complex acoustic repertoire and is vocally active during early development. Vocalisations were recorded during social interactions for four size groups (fry: <2 cm; small juveniles: 2-4 cm; large juveniles: 5-7 cm; adults >25 cm, standard length). Auditory sensitivity of juveniles and adults was determined based on evoked potentials recorded from the inner ear saccule in response to pure tones of 75-945 Hz. We show an ontogenetic increment in the vocal repertoire from simple broadband-pulsed 'grunts' that later differentiate into four distinct vocalisations, including low-frequency amplitude-modulated 'boatwhistles'. Whereas fry emitted mostly single grunts, large juveniles exhibited vocalisations similar to the adult vocal repertoire. Saccular sensitivity revealed a three-fold enhancement at most frequencies tested from small to large juveniles; however, large juveniles were similar in sensitivity to adults. We provide the first clear evidence of ontogenetic vocal differentiation in fish, as previously described for higher vertebrates. Our results suggest a parallel development between the vocal motor pathway and the peripheral auditory system for acoustic social communication in fish.

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A proposed mechanism for the observed ontogenetic improvement in the hearing ability of hapuka (Polyprion oxygeneios)

Cited by 9 publications

References 39 publications

The Potential Overlapping Roles of the Ear and Lateral Line in Driving “Acoustic” Responses

The Potential Overlapping Roles of the Ear and Lateral Line in Driving “Acoustic” Responses

Diversity in Fish Auditory Systems: One of the Riddles of Sensory Biology

Vocal differentiation parallels development of auditory saccular sensitivity in a highly soniferous fish

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