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Shark Bay. Shark Bay is a world heritage site in the Gascoyne region of Western Australia. It is an area centered approximately on 25°30′S 113°30′E

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PowerPoint Slideshow about 'Shark Bay' - lori


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Presentation Transcript
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Shark Bay is a world heritage site in the Gascoyne region of Western Australia. It is an area centered approximately on 25°30′S 113°30′E
  • 800 kilometres north of Perth, on the westernmost point of Australia. An expedition led by Dirk Hartog happened upon the area in 1616, becoming the second group of Europeans known to have visited Australia. Shark Bay was named by William Dampier, in 1699.
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The area has a population of fewer than 1,000 people and a coastline of over 1,500 kilometers. The half dozen small communities making up this population occupy less than 1% of the total area.
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The bay itself covers an area of 10,000 km², with an average depth of 10 metres. It is divided by shallow banks and has many peninsulas and islands. The coastline is over 1,500 km long. It is located in the transition zone between three major climatic regions and between two major botanical provinces.
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Dirk Hartog Island is of major historic significance due to early explorers landing upon it. In 1616 Dirk Hartog landed at Inscription Point on the north end of Dirk Hartog Island and marked his discovery with a plate, which he inscribed with the date and nailed to a post. This plate was then replaced by a later explorer and returned to Holland. It is now kept in the National Museum of Holland. A replica can be found in the Shark Bay Discovery Centre in Denham.
slide6
Bernier and Dorre islands in the north west corner of the Heritage area are locations of some last remaining habitats of some Australian mammals threatened with extinction. They are used, as well and numerous smaller islands throughout the marine park, to release threatened species that are being bred at Project Eden in Francois Peron National Park. These islands are feral-free and so provide a safe haven of pristine environment on which to restore species that are threatened on the mainland.
slide7
The Australian Wildlife Conservatory are guardians of Faure Island off Monkey Mia. Seasonally, turtles come here to nest and in conjunction with DEC studies can be conducted on this sheltered island.
  • Stromatolites in Hamelin Pool are ancient structures that are built by microbes.
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Shark Bay is an area of major zoological importance. It is home to about 10,000 dugongs (sea cows), around 10% of the world's population, and there are many Indo-Pacific bottlenose dolphins, particularly at Monkey Mia. The area supports 26 threatened Australian mammal species, over 230 species of bird, and nearly 150 species of reptile. It is an important breeding and nursery ground for fish, crustaceans, and coelenterates. There are over 323 fish species, with many sharks and rays.
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Some Bottlenose Dolphins in Shark Bay exhibit the only known case of tool use in marine mammals (outside of sea otters): they protect their nose with a sponge while foraging for food in the sandy sea bottom.
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Shark Bay has the largest known area of seagrass, with seagrass meadows covering over 4000 km² of the bay. It includes the 1030 km² Wooramel Seagrass Bank, the largest seagrass bank in the world. Shark Bay also contains the largest number of seagrass species ever recorded in one place; twelve species have been found, with up to nine occurring together in some places. The seagrasses are a vital part of the complex environment of the bay. Over thousands of years, sediment and shell fragments have accumulated in the seagrasses to form vast expanses of seagrass beds. This has raised the sea floor, making the bay shallower. Seagrasses are the basis of the food chain in Shark Bay, providing home and shelter to various marine species and attracting the dugong population.
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In Shark Bay's hot, dry climate, evaporation greatly exceeds the annual precipitation rate. Thus, the seawater in the shallow bays becomes very salt concentrated, or 'hypersaline'. Seagrasses also restict the tidal flow of waters through the bay area, preventing the ocean tides from diluting the sea water. The water of the bay is 1.5x to 2x more salty than the surrounding ocean waters.
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Shark Bay was inscribed as a World Heritage Site in 1991. The site covers an area of 23,000 square kilometres. It includes many protected areas and conservation reserves, including Shark Bay Marine Park, Francois Peron National Park, Hamelin Pool Marine Nature Reserve, Zuytdorp Nature Reserve and numerous protected islands.
  • Denham and Useless Loop both fall within the boundary of the site but are specifically excluded from it. Shark Bay was the first to be classified on the Australian World Heritage list.