The Indo-Pacific bottlenose dolphin (Tursiops aduncus) in Tañon Strait, central Philippines. Issue 1 (December 2016) - Tiongson, Angelico
Abstract Previous sightings of bottlenose dolphins in Tañon Strait, central Philippines, in the late 1980's to early 1990's were limited to the southern section of the strait, in waters <500 m deep, and the species was formerly identified asTursiops truncatus . Photo-identification surveys (n = 117) conducted in 2014 and 2015 in Tañon Strait resulted in 50 encounters of Indo-Pacific bottlenose dolphinsTursiops aduncus . No common bottlenose dolphinT. truncatus was seen. The Indo-Pacific bottlenose dolphin has only recently been confirmed to occur in coastal waters in the Philippines and thus very little is known of its local distribution and ecology. In Tañon Strait, the species was seen across a wide range of water depth (4–668 m, x̅ = 309 m) in groups ranging from 1 to ~60 individuals. We provide a photographic verification of this species and first evidence of a seemingly small population in a tropical protected seascape in the Philippines.