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No fossils exist of other members of the Dugongidae. The colour of a dugong can change due to the growth of algae on the skin. [10] Special habitats are used for different activities. IT C-7 KMG Tower Palau has legislated to protect dugongs, although this is not well enforced and poaching persists. [40], Despite being legally protected in many countries, the main causes of population decline remain anthropogenic and include hunting, habitat degradation, and fishing-related fatalities. Most currently live in established marine parks, where boats must travel at a restricted speed and mesh net fishing is restricted. The eastern side of the Red Sea is home to large populations numbering in the hundreds, and similar populations are thought to exist on the western side. and other non-biodegradable materials abound in the coastal areas. [27] Females tend to be larger than males. Boat strikes on dugongs occur in heavy boat traffic areas and are usually associated with coastal development. The Steller's sea cow became extinct in the 18th century. A large number of infections and parasitic diseases affect dugongs. Alana Grech does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment. Seagrass ecosystems are regarded to be as important as coral reef systems because they are critical to the success of coastal fisheries. Seaweed uses ‘holdfasts’ to anchor itself to other objects; (4) The recorded number of species of seagrass is approximately 60, but there are estimated to be between 5,000 and 6,000 know species of seaweed; (5) Seagrass is a flowering plant, seaweed is a type of large algae; (6) Seagrass uses its roots to extract nutrients from sediment, but seaweed extracts nutrients from the water around it. They can eat up to 40 kilograms of seagrasses per day. [10] As dugongs cannot stay underwater for a very long period, they are highly prone to deaths due to entanglement. Dugongs are seagrass community specialists and their range is broadly coincident with the distribution of seagrasses in the tropical and sub-tropical Indo-West Pacific. In Moreton Bay, dugongs often travel between foraging grounds inside the bay and warmer oceanic waters. In many semi-tropical and tropical regions, seagrass habitats are also often closely linked to mangrove and reef ecosystems, which together are essential for the lifecycles of a number of reef and mangrove-dependent species. As the anthropologist A. Asbjørn Jøn has noted, they are often considered as the inspiration for mermaids,[19][89] and people around the world developed cultures around dugong hunting. Sirenians are thought to have a 50-million-year-old fossil record (early Eocene-recent). [17], The skull of a dugong is unique. Green sea turtles and dugong are iconic animals on the reef, and seagrass is their food. [58] The Gulf of Thailand was historically home to large number of the animals, but none have been sighted in the west of the gulf in recent years,[10] and the remaining population in the east is thought to be very small and possibly declining. Body parts are used as food, medicine, and decorations. [16] Although almost completely herbivorous,[17] they will occasionally eat invertebrates such as jellyfish, sea squirts, and shellfish. [10], Dugong habitat in the Oura Bay area of Henoko, Okinawa, Japan, is currently under threat from land reclamation conducted by Japanese Government in order to build a US Marine base in the area. RoundGlass Sustain is a media-rich resource on India’s natural world. Smaller populations exist up the coast, including one in Ashmore reef. The fossil record shows sirenians appearing in the Eocene, where they most likely lived in the Tethys Ocean. The species is sometimes referred to as a "sea cow" because it grazes on seagrass, although it believed to be more closely related to elephants than cows. [17] Today populations of dugongs are found in the waters of 37 countries and territories. Marine conservation awareness programme by OMCAR Foundation in Palk Bay. [97] The construction is expected to seriously damage the dugong population's habitat, possibly leading to local extinction. [10] An endangered population of 50 or fewer dugongs, possibly as few as three individuals, survives[66] around Okinawa. [88] The age when a female first gives birth is disputed, with some studies placing the age between ten and seventeen years, while others place it as early as six years. They are either struck by the hull of the boat or more often cut … E xplore The Pew's Charitable Trusts' ocean-science facts, findings, and fellows. “Dugong leaves the required gaps in between seagrasses that facilitate further growth and makes the seagrass habitats conducive for breeding of fishes that are commercially important for the livelihoods of fishermen.

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