Beak deviations in the skull of Franciscana dolphins Pontoporia blainvillei from Argentina

DENUNCIO, P; RODRÍGUEZ, D; DEL CASTILLO,D; BASTIDA, R; PANEBIANCO, MV; CAPOZZO,HL

DISEASES OF AQUATIC ORGANISMS

INTER-RESEARCH

Lugar: Oldendorf/Luhe; Año: 2016 vol. 120 p. 1 - 7

0177-5103

The Franciscana dolphin Pontoporia blainvillei is characterized by a long rostrum,a feature that is shared with the families formerly classified as river dolphins (Pontoporiidae,Platanistidae, Iniidae, Lipotidae). Although there are occasional reports on the existence of beakdeformations, very little published information exists describing this process. The object of thepresent study was to describe and quantify the beak anomalies of Franciscana dolphins from thecoastal waters of Argentina. Of 239 skulls analyzed 12% showed beak deviations (BD), affectingthe premaxillary−maxillary and dentary bones to different extents. The occurrence of BD in thedentary bone represented 58%, whereas premaxillary−maxillary BDs were observed in 14% ofthe studied specimens, while the complete rostrum (dentary, premaxillary and maxillary) wasaffected in 28% of the skulls. Dorsoventral axis BD was more frequent than lateral BD (48 and38%, respectively), and double BD was only observed in the dentary bone. Most of the BDobserved in this study could be classified as mild/moderate, and we assume that it did not affectthe feeding activities of individuals; however, 2 specimens (