Evolution and diversity of ram-suction feeding in damselfishes (Pomacentridae)
The cerato-mandibular (c-md) ligament is a synapomorphy within Pomacentridae that creates a tight link between the lower jaws and the hyoid bars. However, this morphological trait has been secondarily lost in multiple lineages during evolution. A previous study revealed that the loss of this trait acted as a release of evolutionary constraints, leading to a cascade of morphological changes such elongated buccal jaws and a slender body. Ecomorphological interpretations suggested the loss of the c-md ligament has ultimately led to a new adaptive peak in zooplanktivory through an optimization of the ram feeding mode associated with a specialization in pelagic feeding. Here, we tested these hypotheses by comparing functional and diet diversity between damselfish species with and without the c-md ligament. Although species lacking the c-md ligament presented a conserved kinematic pattern resulting from high ram and low suction performances, our results did not support an optimization of the ram feeding mode. Indeed, some species with the c-md ligament showed the same or exceeded the ram performance of species without the c-md ligament. The species with the c-md ligament had a more diverse kinematic pattern exploring the entire ram-suction functional range in damselfishes. Finally, our results did not show any diet variations associated with the loss of the c-md ligament. Our study furthers the understanding of how a morphological trait has shaped, by its presence or absence, the ecomorpho-functional diversification of Pomacentridae.
KeywordsCerato-mandibular ligament Evolutionary morphology Specialization Reef fishes Zooplanktivory
We thank the two anonymous reviewers for their helpful comments. We thank Dr. Roi Holzman for making us welcome at the Interuniversity Institute for Marine Sciences, Eilat (IUI). DO was a PhD student of FRIA. BF is a postdoctoral fellow at the Belgian Science Policy (BELSPO). LG is a research fellow of F.R.S-F.N.R.S. This research was supported by the FRFC grants from the F.R.S.-FNRS (no. 2.4.535.10) and by the Association of European Marine Biological Laboratories (ASSEMBLE).
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