Further insight into the sound-producing mechanism of clownfishes: what structure is involved in sound radiation?

Colleye, Orphal; Nakamura, Masaru; Frederich, Bruno; Parmentier, Éric

doi:10.1242/jeb.067124

Cited by 18 publications

(19 citation statements)

References 45 publications

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“…Subsequent work indicated that damselfish sounds are initiated by a stretched ceratomandibular ligament that causes a rapid mouth closure and collision of front teeth [54]. Colleye et al then demonstrated that striking the ribs, which are intimately associated with the swimbladder, produces sounds with a similar frequency spectrum as sounds of the intact fish [55]. Thus, energy from teeth collisions is transferred to the ribs, and rib vibration drives the swimbladder.…”

Section: Discussionmentioning

confidence: 99%

Wall structure and material properties cause viscous damping of swimbladder sounds in the oyster toadfishOpsanus tau

et al. 2016

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Despite rapid damping, fish swimbladders have been modelled as underwater resonant bubbles. Recent data suggest that swimbladders of soundproducing fishes use a forced rather than a resonant response to produce sound. The reason for this discrepancy has not been formally addressed, and we demonstrate, for the first time, that the structure of the swimbladder wall will affect vibratory behaviour. Using the oyster toadfish Opsanus tau, we find regional differences in bladder thickness, directionality of collagen layers (anisotropic bladder wall structure), material properties that differ between circular and longitudinal directions (stress, strain and Young's modulus), high water content (80%) of the bladder wall and a 300-fold increase in the modulus of dried tissue. Therefore, the swimbladder wall is a viscoelastic structure that serves to damp vibrations and impart directionality, preventing the expression of resonance.

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Section: Discussionmentioning

confidence: 99%

Wall structure and material properties cause viscous damping of swimbladder sounds in the oyster toadfishOpsanus tau

et al. 2016

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“…Sounds in pomacentrids are produced by a jaw slam that causes teeth collision [32,35,47]; for this reason the start of the sound corresponds to the bite. The sounds produced during fighting and during the biting of filamentous algae can be clearly recorded with a hydrophone.…”

Section: Electromyographymentioning

confidence: 99%

“…the slam of oral jaws). On the other hand, variation observed in pulse durations could be related to other aspects of sound production, such as sonic radiation (see [47]). In all sequences of grazing studied with high-speed video, the individuals keep their jaws closed to pull away algae.…”

Section: Sounds In Agonistic Behavior and Grazingmentioning

confidence: 99%

The cerato-mandibular ligament: a key functional trait for grazing in damselfishes (Pomacentridae)

et al. 2014

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Introduction: The success of a taxonomic group can be promoted by a key character that allows the group to interact with its environment in a different way and to potentially occupy new niches. The Pomacentridae possess a synapomorphic trait, the cerato-mandibular (c-md) ligament, which joins the hyoid bar to the inner part of the lower jaw. It has previously been shown that this ligament is a key trait in communication in damselfishes because it enables them to slam the oral jaws shut causing teeth collision and sound production. This specific behavior of mouth closing could, however, also be used for other tasks, such as feeding. Many territorial damselfishes are referred to as farmers, due to their ability to manage algal crops on which they feed. This study hypothesizes that the c-md ligament provides an advantage for grazing filamentous algae, and should thus be considered a key trait for farming behavior. Results: The kinematic patterns associated with sound production and biting filamentous algae or attached animal prey are all based on the same mechanism and are associated with a slam of the oral jaws. We observed that transection of the c-md ligaments makes the fish unable to perform such actions. We also counted biting rates on filamentous algae in fish with and without the c-md ligament and observed a drop of more than 80% in the latter. Conclusion: This study shows that the c-md ligament is a key trait both for sound production and for grazing activities in damselfishes. The buccal jaw slam enables the fish to perform accurate strikes on small filamentous algae. This kind of bite probably plays a major role in farming activity and allows grazing damselfishes to occupy distinct niches, possibly increasing their competitive evolutionary success.

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“…During simultaneous neurocranium elevation and hyoid depression, it acts as a cord, forcing rapid mouth closing [18] (figure 1). The forceful contact of the teeth of the upper and lower jaws is responsible for producing pulsed sounds [18,27]. As a result of the cmd ligament, the hyoid and mandible represent a coupled system that is subjected to, at least, two distinct functional demands: feeding and sound production.…”

Section: Introductionmentioning

confidence: 99%

Trait decoupling promotes evolutionary diversification of the trophic and acoustic system of damselfishes

et al. 2014

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Trait decoupling, wherein evolutionary release of constraints permits specialization of formerly integrated structures, represents a major conceptual framework for interpreting patterns of organismal diversity. However, few empirical tests of this hypothesis exist. A central prediction, that the tempo of morphological evolution and ecological diversification should increase following decoupling events, remains inadequately tested. In damselfishes (Pomacentridae), a ceratomandibular ligament links the hyoid bar and lower jaws, coupling two main morphofunctional units directly involved in both feeding and sound production. Here, we test the decoupling hypothesis by examining the evolutionary consequences of the loss of the ceratomandibular ligament in multiple damselfish lineages. As predicted, we find that rates of morphological evolution of trophic structures increased following the loss of the ligament. However, this increase in evolutionary rate is not associated with an increase in trophic breadth, but rather with morphofunctional specialization for the capture of zooplanktonic prey. Lineages lacking the ceratomandibular ligament also shows different acoustic signals (i.e. higher variation of pulse periods) from others, resulting in an increase of the acoustic diversity across the family. Our results support the idea that trait decoupling can increase morphological and behavioural diversity through increased specialization rather than the generation of novel ecotypes.

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Further insight into the sound-producing mechanism of clownfishes: what structure is involved in sound radiation?

Cited by 18 publications

References 45 publications

Wall structure and material properties cause viscous damping of swimbladder sounds in the oyster toadfishOpsanus tau

Wall structure and material properties cause viscous damping of swimbladder sounds in the oyster toadfishOpsanus tau

The cerato-mandibular ligament: a key functional trait for grazing in damselfishes (Pomacentridae)

Trait decoupling promotes evolutionary diversification of the trophic and acoustic system of damselfishes

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