the area in which the animal is naturally found, the region in which it is endemic. 1999. (On-line pdf). These dolphins live in the shallow waters closer to the coastline. Their territories cover about 35 kilometers in length. The teeth are pointed and narrow like pegs. body of water between the southern ocean (above 60 degrees south latitude), Australia, Asia, and the western hemisphere. Its dorsal fin at the back end is small and has a triangle shape while the pectoral flippers are long, wide and also triangular. Genus: Orcaella. Your contribution will be appreciated to improve our site. Irrawaddy dolphins have narrow, pointed, peg-like teeth about 1 cm in length in both the upper and lower jaws. This is the world's largest ocean, covering about 28% of the world's surface. Accessed at http://www.wdcs.org/submissions_bin/consprojectirr.pdf. The low reproduction rate and the human-related threats contribute to the rapid decline of the Irrawaddy dolphin populations and the danger of extinction in some areas. Dawblin, W. 1972. 2007. Convergent in birds. "Irrawaddy Dolphin" The Irrawaddy river dolphin is a species that belong to the group of oceanic dolphins. having more than one female as a mate at one time. In the first seven months the calves increased in length by 59% and 266% in weight. Individuals from eastern Borneo make daily migrations to the Mahakam River but always return to their area at night. associates with others of its species; forms social groups. 1983. (On-line). They also work with humanssometimes to gather food in the wild and that is really interesting to observe. Location: Irrawaddy dolphins live in the the oceans brackish water near coasts and river mouths, as well as estuaries There are also a few small populations living in the Ganges, Mekong, and Irrawaddy rivers. March 08, 2010 Classification, To cite this page: For the following seven months the calves stay within the pod and continue to receive nourishment from the mother while also eating fish. Additionally, Irrawaddy dolphins have bulging heads, with the forehead extending past the mouth, broad triangular, paddle-like, pectoral fins, and small, triangular dorsal fins set approximately two-thirds of the body length along the back. They have a forehead that extends beyond the rest of the facial features. Adult length is achieved between three and five years old. Students and teachers are allowed to use this information for school projects and homework. 2004. Data from Chilka Lake, India shows a low rate of breeding and production of only a single calf in three years. Fortunately, this dolphin under protection in Laos, Vietnam, and Cambodia, and Bangladesh, India, Laos, Malaysia, Burma, and Thailand banned its hunting. areas with salty water, usually in coastal marshes and estuaries. Additionally, Irrawaddy dolphins have brought ecotourism to communities in Indonesia and India. Vocalizations of Irrawaddy dolphins in captivity within the Mahakam River, Indonesia included a single-component sonar signal, with the majority of frequencies captured at 60 kHz. April 24, 2010 Accessed Additional support has come from the Marisla Foundation, UM College of Literature, Science, and the Arts, Museum of Zoology, and Information and Technology Services. Smith, B., T. Mya. Hong Kong: Hong Kong University Press. Body mass varies from 114 kg to 143 kg and the length ranges from 146 cm to 275 cm. The Irrawaddy dolphin is a slow swimmer, but swimming speeds of 20–25 kilometres per hour (12–16 mph) were reported when dolphins were being chased in a boat. The ADW Team gratefully acknowledges their support. ("Irrawaddy Dolphin", 2006; Stacey and Leatherwood, 1997), Unlike other dolphins, Irrawaddy dolphins lack a beak and have flexible necks. (Boran, et al., 2009), In the Irrawaddy River these dolphins engage in cooperative fishing with cast-net fishermen. It has also increased stress levels for the dolphins. Page 183. https://www.worldwildlife.org/species/irrawaddy-dolphin, Designed by Elegant Themes | Powered by WordPress. Males tend to be larger in mass and length, with a larger dorsal fin. Individuals reach sexual maturity at around 3-9 years of age and the mating season is variable. reproduction in which fertilization and development take place within the female body and the developing embryo derives nourishment from the female. In other words, India and southeast Asia. ("Mammalian Species Orcaella brevirostris", 1999; "Orcaella brevirostris (Gray, 1866)", 2010; "Trey Psaut Cambodia’s Irrawaddy Dolphin", 2007; Stacey and Leatherwood, 1997), Irrawaddy dolphins are not completely weaned until 2 years. This species of dolphin lives in smaller pods than most of the species. They are hosts for parasites including roundworms (Anisakis simplex), flukes (Braunina cordiformis), and tapeworms (Monorygma delphini). The largest decline of them has been found in Thailand due to commercial fishing efforts. There are no identified natural predators of this species, and only the humans represent a threat to them. offspring are produced in more than one group (litters, clutches, etc.) Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes). Accessed The Animal Diversity Web is an educational resource written largely by and for college students. and across multiple seasons (or other periods hospitable to reproduction). Females tend to be smaller than the males. However, it has been seen jumping, making bubbles and hitting the water with its flippers and tail. (On-line pdf). It is a carnivorous cetacean that feeds on several species of cephalopods, fish, crustaceans and fish eggs. by Dolphins-World | Apr 26, 2017 | Species |. ("Mammalian Species Orcaella brevirostris", 1999; "Status and Conservation of Facultative Freshwater Cetaceans in Asia", 2002; Dawblin, 1972; Stacey and Leatherwood, 1997). Their diet includes fish, crustaceans, and squid. They don’t have a cardiac sphincter. Once they do so there is enough turbulence for the fishermen to place their nets and to capture them. Dynamite and electric fishing occur in some important habitats. uses smells or other chemicals to communicate. © 2020 Regents of the University of Michigan. 1997. Since the animals live in small groups averaging between three to six individuals, it is presumed that breeding happens outside of those groups. ("Trey Psaut Cambodia’s Irrawaddy Dolphin", 2007; Stacey and Leatherwood, 1997). The threat of gill net entanglement occurs primarily during the dry season (December to May), when dolphins settle in deep water pools. They can be from 70 to 108 inches long and they can weigh from 215 to 350 pounds. the region of the earth that surrounds the equator, from 23.5 degrees north to 23.5 degrees south. "Whales, porpoises and dolphins." having the capacity to move from one place to another. Ecotourism implies that there are existing programs that profit from the appreciation of natural areas or animals. By Melissa Koss; Lucretia Mahan; Sam Merrill, gonochoric/gonochoristic/dioecious (sexes separate), post-independence association with parents, Status and conservation of freshwater populations of irrawaddy dolphins, dolphins, killer whales, pilot whales, and relatives, "Mammalian Species Orcaella brevirostris", 1999, "Trey Psaut Cambodia’s Irrawaddy Dolphin", 2007, "Orcaella brevirostris (Gray, 1866)", 2010, "Status and Conservation of Facultative Freshwater Cetaceans in Asia", 2002, "Facultative river dolphins : conservation and social ecology of freshwater and coastal Irrawaddy dolphins in Indonesia", 2004, http://www.opcf.org.hk/pdf/species/Irrawaddy_Dolphin.pdf, http://www.science.smith.edu/msi/pdf/i0076-3519-616-01-0001.pdf, http://www.cms.int/reports/small_cetaceans/data/O_brevirostris/O_brevirostris.PDF, http://137.110.142.7/uploadedFiles/Divisions/PRD/Publications/Smith_Jefferson2002(66).pdf, http://faculty.washington.edu/banasn/animals/student_work/Julia%20Boubel,%20Trey%20Psaut.pdf, http://www.service-board.de/ascobans_neu/files/ac16/AC16_31_OrderCetacea_SWF.pdf, http://www.wdcs.org/submissions_bin/consprojectirr.pdf.

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