Tursiops aduncus

Range: Tursiops aduncus only occurs in the waters of Jeju Island (Kim 2004; Fig. 101).

Sumber: Mammals of Korea: a review of their taxonomy, distribution and conservation status

Distribution: Indian Ocean. In Myanmar, recorded in the nearshore waters of the Myeik Archipelago (Smith and Tun 2008).

Sumber: Mammals of Myanmar: an annotated checklist

Conservation: CITES – Appendix II; IUCN – Data Deficient.

Sumber: Order Cetacea

Distribution: Indian Ocean; distribution in Pacific uncertain.

Sumber: Order Cetacea

Habitat. Tropical to warm temperate waters, occasionally in cooler waters (e. g. offJapan, northern China, southern Australia, and South Africa). Sea-surface temperatures where the Indo-Pacific Bottlenose Dolphin is found vary greatly between regions but are generally 20 - 30 ° C. Preferred habitats of Indo-Pacific Bottlenose Dolphins appear to be near-shore, continental shelf waters and areas with sandy or rocky bottoms, coral reefs, or seagrass beds. They are most abundant in waters less than 100 m deep but can be found in waters deeper than 200 m.

Sumber: Delphinidae

Movements, Home range and Social organization. The Indo-Pacific Bottlenose Dolphin usually travels in groups of 20 - 50 individuals, although groups of up to 2000 individuals have been reported in South Africa. Mean group size in Plettenberg Bay is thought to be 140 individuals. Group size tends to be larger when young offspring are present. Based on populations in regions that have been studied extensively, Indo-Pacific Bottlenose Dolphins tend to be year-round residents in fairly limited coastal habitats. Minimum home range is thought to be more than 200 km? with males tending to range more widely than females. Individual Indo-Pacific Bottlenose Dolphins in waters of Kyushu, Japan, have been recorded in both Oita Prefecture and Kagoshima Bay, which are hundreds of kilometers away from each other. Movement across deep oceanic waters has been reported, but it is unknown if such movements are common. The Indo-Pacific Bottlenose Dolphin has been observed in groups with a variety of other species of delphinids, including the Common Bottlenose Dolphin, the Indo-Pacific Humpback Dolphin (Sousa chinensis), the Spinner Dolphin (Stenella longirostris), the False Killer Whale (Pseudorca crassidens), and common dolphins (Delphinus spp.). Sex ratio of the Indo-Pacific Bottlenose Dolphin is about equal at birth, but there are more males at subadulthood and more females surviving to adulthood. Natal philopatry occurs in some regions. Social organization of the Indo-Pacific Bottlenose Dolphin can be best described as fission — fusion. Males can form small alliances (general 2 - 3 individuals) to challenge other groups of males for access to females. These groups may have long-term consistency, suggesting persistent relationships among cooperating males — an unusual social trait among mammals. Female Indo-Pacific Bottlenose Dolphins can also form cooperative groups for protection against predators, to raise young, and for avoiding male coercion.

Sumber: Delphinidae