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Communication Dans Un Congrès Année : 2022

Does the shape of coleoid beaks bear an ecological signal?

Résumé

Cephalopod beaks provide critical information in understanding cephalopod biology, their ecology and their role in marine ecosystems. Although mandible shape has been shown to be adaptive in many vertebrate taxa, coleoid beak shape and its possible relationships with trophic ecology and habitat use has never been investigated. This is partly due to the consensus that the diet of coleoids is not diversified enough for the beaks to reflect dietary adaptations. More recently, studies have proposed that the beaks of paralarvae of octopods, argonauts, and some squid show features that may facilitate prey ingestion, and that the diet varies during the life cycle, ranging from detritivory in paralarvae to carnivory in adults in some ommastrephid species. This suggests that the debate on the possible adaptive signal in cephalopod beaks should be revisited. Here, we investigated whether variation in cephalopod beak shape reflects ecology and/or, is driven by phylogenetic relatedness. We imaged 101 lower and 108 upper beaks in 3D belonging to 75 species of octopods and squids. Morphometric analysis shows that there is a significant but only moderate phylogenetic signal. Comparative, phylogenetically informed, analyses demonstrate that beak shape is also driven by ecology. We detected significant differences in beak shape between species inhabiting different habitats (pelagic, benthic, or demersal) and of different trophic levels. These results provide new insights into the drivers of beak shape diversity in coleoids and suggest that beak shape has evolved adaptively in relation to diet and habitat use.
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Dates et versions

hal-03665412 , version 1 (11-05-2022)

Identifiants

  • HAL Id : hal-03665412 , version 1

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Marjorie Roscian, Anthony Herrel, Raphael Cornette, Vincent Fernandez, Isabelle Kruta, et al.. Does the shape of coleoid beaks bear an ecological signal?. Cephalopod International Advisory Council 2022, Apr 2022, Sesimbra, Portugal. ⟨hal-03665412⟩
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