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• W2271696885 abstract "The damselfishes (Pomacentridae) are one of the most conspicuous fish radiations in rocky and coral reefs. Despite of this recognized success, no hypothesis has been emitted to explain this extraordinary radiation. Sometimes, the evolutionary success of a taxon can be explained by a key innovation that enables it to interact with its environment in an original way. Damselfishes possess a particular ligament, called ceratomandibular (c-md) ligament, joining the ceratohyal of the hyoid bar to the coronoid process of the angular of the mandible. This ligament enables the damselfish to slam shut its mouth in a few milliseconds (2-4 ms). A few years ago, it has been discovered this movement provokes teeth collision, emitting a sound that is used in various behavioural contexts. However, because of its relation with the oral jaws, we expected the c-md ligament to have a larger influence on the evolutionary success of damselfishes by its involvement in other tasks such as feeding behaviour. The present thesis first investigated the feeding mechanisms in six damselfish species representing the taxonomic and trophic diversity of the family: the zooplanktivorous Abudefduf troschelii, Amphiprion clarkii and Chromis chromis, and the grazers Neoglyphidodon nigroris, Stegastes leucostictus and Stegastes rectifraenum. Although no role of the c-md ligament has been found for zooplanktivory, we highlight this ligament plays a major role in the grazing of filamentous algae. The c-md ligament allows grazers to perform accurate bites on small filamentous algae which they feed on. Moreover, the c-md ligament represents a novel way to close the mouth in addition to the adductor mandibulae complex. That duplication of mouth closing systems mitigates one of the most common functional trade-off in musculoskeletal systems, the one between force and speed transmission. A study on 32 damselfish species revealed that the adductor mandibulae are well-suited for force transmission in grazers. However, those species are also able to close their mouth very quickly thanks to the c-md ligament. That functional decoupling is very useful for grazers for which a fast bite allows the seizure of the small algae with accuracy and a forceful bite allows extracting them from the substrate. The farming behaviour is an unusual activity in fishes that is widespread in damselfishes and consists of the managing of algae crops on a small territory. The c-md ligament would be the key innovation allowing the emergence of such a behaviour sustaining the fitness of the grazing species and diversification of the family through its evolutionary history. We also discovered that some zooplanktivorous damselfish lineages lack the c-md ligament. The study of numerous species (126) revealed those lineages have colonized a distinct morpho-functional space, unoccupied by species with the c-md ligament. Those species have more elongated body and jaws, characteristic of species preying upon elusive planktonic animals in the water column. A functional analysis on 15 species showed that the lineages without the c-md ligament diverged functionally towards a high ram-feeding mode to capture their prey. The loss of the c-md ligament may have thus acted as a release of evolutionary constraints promoting the exploration of new adaptive zones. Finally, this thesis highlights that both presence and absence of the c-md ligament have shaped and sustained the diversification of the family, making this trait a major element through the evolutionary history of Pomacentridae." @default.
• W2271696885 created "2016-06-24" @default.
• W2271696885 creator A5037896380 @default.
• W2271696885 date "2015-06-25" @default.
• W2271696885 modified "2023-09-27" @default.
• W2271696885 title "The cerato-mandibular ligament: a key trait in the diversification of damselfishes (Pomacentridae)" @default.
• W2271696885 hasPublicationYear "2015" @default.
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