The residency pattern and site fidelity of Risso’s dolphin Grampus griseus were studied using sightings data collected during standardized vessel-based surveys carried out from 2013 to 2018 in the Gulf of Taranto (Northern Ionian Sea, Central-Eastern Mediterranean Sea). The photo-identification of 91 individuals of G. griseus and the occurrence of re-sighted dolphins up to 8 times provide the evidence that this mid-sized odontocetes persistently occurred in the study area. The presence of transient individuals, visitors, and seasonal residents in the Gulf of Taranto, along with the 29 multi-year resident Risso’s dolphins observed from 2 to 4 times on different years, indicated some degree of inter-annual variability in its temporal use of the area. Moreover, the occurrence of newborns and calves through the study period suggests the possibility to consider the Gulf of Taranto as both nursery and feeding area for females caring for their offspring. The importance of the Gulf of Taranto as critical habitat for the Risso’s dolphin as well as the common bottlenose dolphin and the striped dolphin candidates this area as potential Important Marine Mammal Area, in which enforce specific conservation measures are aimed to mitigate the anthropogenic pressure on different cetacean species according to ACCOBAMS and the MMPATF indication.

中文翻译：

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塔兰托湾（北爱奥尼亚海，中东部地中海）的灰熊（居维叶，1812年）的居住模式和现场逼真度

使用从2013年至2018年在塔兰托湾（北爱奥尼亚海，地中海中部东部）进行的标准化船基调查期间收集的目击数据，研究了里索海豚Grampus griseus的居住模式和场地逼真度。91. Griseus griseus的照片鉴定再次观察到海豚的次数高达8次，这证明了这种中等大小的齿突科动物在研究区内持续发生。塔兰托湾的暂住人员，来访者和季节性居民的存在，以及29位多年居住的里索海豚在不同年份的2-4次观察到，表明其在时间上的使用存在一定程度的年际变化。该地区。此外，整个研究期间新生儿和小牛的出现表明，有可能考虑将塔兰托湾作为照顾后代的雌性的苗圃和喂养区。塔兰托湾是Risso海豚以及普通宽吻海豚和条纹海豚候选地区的重要栖息地的重要性，该地区是潜在的重要海洋哺乳动物区，