The Irrawaddy dolphin (Orcaella brevirostris) is a euryhaline species of oceanic dolphin found in scattered subpopulations near sea coasts and in estuaries and rivers in parts of the Bay of Bengal and Southeast Asia. It closely resembles the Australian snubfin dolphin (of the same genus, Orcaella), which was not … See more One of the earliest recorded descriptions of the Irrawaddy dolphin was by Sir Richard Owen in 1866 based on a specimen found in 1852, in the harbour of Visakhapatnam on the east coast of India. It is one of two species in its genus. … See more The Irrawaddy dolphin's colour is grey to dark slate blue, paler underneath, without a distinctive pattern. The dorsal fin is small and rounded behind the middle of the back. The forehead … See more Communication is carried out with clicks, creaks, and buzzes at a dominant frequency of about 60 kilohertz, which is thought to be used for See more Irrawaddy dolphins have a mutualistic relationship of co-operative fishing with traditional fishers. Fishers in India recall when they would call out to the dolphins, by tapping a wooden … See more The species name brevirostris is from the Latin meaning short-beaked. It is very closely related to the Australian snubfin dolphin (Orcaella heinsohni). The two snubfin dolphins … See more Although sometimes called the Irrawaddy river dolphin, it is not a true river dolphin, but an oceanic dolphin that lives in brackish water near coasts, river mouths, and estuaries. It has established subpopulations in freshwater rivers, including the See more Irrawaddy dolphins are more susceptible to human conflict than most other dolphins that live farther out in the ocean. Drowning in See more WebIrrawaddy dolphins are usually seen in groups of 2 to 5 individuals, although they are sometimes spotted in groups as large as 15. 6 10. Staying in groups keep them safe Irrawaddy dolphins are vulnerable to threats from sharks. By staying in groups, they become more difficult to hunt and have better chances of survival. 11.
Genetic structure of the endangered Irrawaddy dolphin (Orcaella ...
WebSep 21, 2010 · Indian Irrawaddy dolphin showed closest genetic identity with its counterpart from Thailand (bp difference, 0.3%). CYB sequence comparison indicated that the Indian haplotype was genetically farthest from the unknown sample (6.2%), followed by the one from Australia (5.9%). WebIrrawaddy dolphins were reported to be at the highest bycatch risk. ... (2003) for any population with an Nmin <1500), the PBR for the population of Irrawaddy dolphins in Kuching Bay is estimated to be only 0.29 dolphins per year. Assuming a less pessimistic recovery factor of 0.5 raises the PBR to 1.43 animals per year, and assuming that the ... how many spells can a artificer have
Irrawaddy dolphin - IWC
WebApr 2, 2024 · The Irrawaddy dolphin (Orcaella brevirostris) is an endangered, small cetacean species which is widely distributed in rivers, estuaries, and coastal waters throughout the tropical and subtropical Indo-Pacific. Despite the extensive distribution of this species, little is known of individual movement … WebSoutheast-Asian Irrawaddy dolphins ( Orcaella brevirostris) are highly susceptible to anthropogenic effects that reduce effective population size and genetic diversity. Coastal populations are currently listed as “Vulnerable” on IUCN’s Red List, while some riverine populations are listed as “Critically Endangered”. Though conservation ... WebApr 11, 2024 · 2.9 Irrawaddy dolphins. 2.10 Spinner and Fraser’s dolphins. 2.11 Yangtze River dolphins ... Two stocks have been identified in the population but genetic information and bycatch levels ... Initial … how many spells are in ro wizard