ABSTRACTS OF POSTERS –BEHAVIOUR


B 17 Sociogram focused on bottlenose dolphin infants on the basis of affiliative tactile interactions


Raffaella Tizzi (1), Andrea Saglietti (2), Pier Attilio Accorsi (2)


(1) Delfinario Rimini, Lungomare Tintori 2, 47921 Rimini, Italy (2) Dipartimento di Scienze Mediche Veterinarie, Università degli Studi di Bologna, via Tolara di Sopra 50 – 40064 Ozzano Emilia (BO), Italy


raftizzi@gmail.com


As members of a fluid but socially structured society, bottlenose dolphin (Tursiops truncatus) infants, in the period between zero and one year of age, are involved in reiterated and diversified affiliative interactions. Through sociograms representing the infants’ social links, this work aims to delineate the contacts promoted or received by calves from conspecifics. Behavioural data were systematically collected on four calves born in different periods (1995, 1997, 2003 and 2007) at the Rimini Delfinario (Italy). During their first year of life, a total of 1440 sessions lasting 30 minutes each (total 720 hours) were carried out. The software Observer 5.0 (Noldus) was applied to assess the frequency of following behaviours: “contact”, “rubbing”, “bonding”, “bumping” and “beak-genital propulsion”. Even if accompanied by a gradual decreasing in affiliative contacts with months, the mother remained the pivot around which calves’ relationship with other individuals revolved. Nutritional and protective factors firmly set the mother-calf pair with frequency values over 70% of active touches and about 60% of passive. At the opposite, the male parent has almost no role. As for other conspecifics, the choices of preference within the group showed adult nulliparous females to be useful aunt in neonatal phases while juveniles males appeared, besides the mother, the most interactive partners after the first month of life. Both classes registered about 15% of given contacts and over 20% of received. In conclusion, distinctive social roles and links could be detected depending on sex-age-kin characteristics, confirming how calves’ tactile relationships are extremely affected by both age and differences in group composition and size.


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