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Auteur Segall, M.; Cornette, R.; Fabre, A.-C.; Godoy-Diana, R.; Herrel, A. openurl 
  Titre Does aquatic foraging impact head shape evolution in snakes? Type Article scientifique
  Année (down) 2016 Publication Proceedings Of The Royal Society B-Biological Sciences Revue Abrégée  
  Volume 283 Numéro Pages  
  Mots-Clés aquatic snakes, head morphology, hydrodynamics, constraints, convergence, geometric morphometrics  
  Résumé Evolutionary trajectories are often biased by developmental and historical factors. However, environmental factors can also impose constraints on the evolutionary trajectories of organisms leading to convergence of morphology in similar ecological contexts. The physical properties of water impose strong constraints on aquatic feeding animals by generating pressurewaves that can alert prey and potentially push them away from the mouth. These hydrodyn- amic constraints have resulted in the independent evolution of suction feeding in most groups of secondarily aquatic tetrapods. Despite the fact that snakes cannot use suction, they have invaded the aquatic milieumany times indepen- dently. Here, we test whether the aquatic environment has constrained head shape evolution in snakes and whether shape converges on that predicted by biomechanical models. To do so, we used three-dimensional geometric morphometrics and comparative, phylogenetically informed analyses on a large sample of aquatic snake species. Our results show that aquatic snakes partially conform to our predictions and have a narrower anterior part of the head and dorsally positioned eyes and nostrils. This morphology is observed, irrespective of the phylogenetic relationships among species, suggesting that the aquatic environment does indeed drive the evolution of head shape in snakes, thus biasing the evolutionary trajectory of this group of animals.  
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  Numéro d'Appel mnhn @ marion.segall @ collection 1491  
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