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Transcript of Geographical:
The Latitude and the Longitude the Australian Tropical Savanna is 15 degrees North and 30 degrees South, and 15 degrees West, and 40 degrees East.
The elevation is from 250 to 3250 ft.
The specific location is in northern Australia from Broome to Townsville.
Ecotone: There is a savanna/woodland ecotone in Wolfe Creek Meteorite Crater, Western Australia.
There are other ecotones that consist of a savannas and deserts.
Emu - The largest bird that inhabits the grassy fields of Australia.
Koala Bear - Very common mammal of Australia
Bats - About a third of the native fauna
Saltwater Crocidile - The largest reptile in the world
Jarrah Tree -one of the many species of eucalyptus.
Cycads - lean plants that resemble small palm trees.
Pandanus spiralis - are adapted to regular fires
Kangaroo Paw - The biennial red and green kangaroo paw is the floral emblem of Western Australia.
- Jarrah Swan River Mahagony
- Red kangaroo
Australian Tropical Savanna Food Web
Interaction between Organisms
Marsupials dominate among the animals in this area of Australia.
Examples: Echidna, Eastern Gray Kangaroo, the Koala Agile and Whiptale Wallabies, Walaroos, Possums, Gliders, the Northern Qoull, and the Golden Bandicoot.
Australia, unlike Africa, does not have large animals such as giraffe, zebra and wildebeest.
Much of the plant material is eaten and re-cycled by insects such as termites!
More than 40 thousand years ago, however, there were large grazing animals in Australian tropical savannas, such as giant wombats and kangaroos. They have become extinct due to biome threats.
The Australian Tropical Savanna is an area of dense grass and scattered trees in the northern part of Australia.
A savanna is usually very flat and with few trees and shrubs, because the fires destroy most of the trees and shrubs.
Predation : The larger animals in the Australian savanna are the predators.
flying foxes, dingos, possums and large birds are the ones feeding on the termites, bugs, small mammals like wombats, and underdeveloped babies that are unattended.
Commensalism: when one animal benefits from an interaction with another, but the other animal is unaffectd by their interaction.
For example, an animal grazing gets no real benefit, but the insects following them will feed on smaller bugs and get greater nutrients from the grass
Animals and plants are compete to survive in the Australian savanna.
Animals - competition for food sources aren't common due to the differentiation in diets.
For example, a kangaroo does not eat what a possum would, or a large herbivore. The birds usually feast on dead animals.
Endangered Species of the ATS
Many diverse types of Kangaroos are highly endangered in the ATS.
The Rat Kangaroo and the Dunnart Kangaroo are some of the many.
The reason for their low numbers:
foreign pests and weeds that have been brought to this biome, such as the wetland weed Mimosa
Farmers took over land, they brought with them new systems that caused some species to become endangered.
The Kangaroos of the ATS
The Aboriginal people have been stripped of their homes so that the government can make more room for agriculture.
The World Wildlife Fund (WWF) in Australia is reacting to this destruction by working with the communities to stop the clearing programs.
There are a couple million kangaroos left in Australia, but the numbers are rapidly plummeting, endangering many species of Kangaroos
• Must be remembered that Australia is actually the world’s SECOND-driest continent, following right after Antarctica.
Average temp during wet season= 85 degrees F.
• Average temp during dry season= 70 degrees F.
• Eighty percent of Australia receieves less than 600 mm of rainfall per pear, while 50 percent receives fewer than 300 mm.
Climate and Moisture/water:
• Mostly grass grows in the Savanna; trees require too much water and since in the dry season It doesn’t rain, the trees can only grow in the moist , or wet season.
Wet season is during the summer
• It is warmer during the rainy season, due to the humidity.
Average precipitation per year in the Australian Savanna= 20 to 40 inches.
So, some of the highest annual rainfall is received in Australia’s tropical savannas.
• Only form of moisture in Australian Savanna= RAIN.
• This is important for the growth of crops and grass.
• Also, it is important for dams because a lot of rain results in an immense amount of water collected over the years.
Mostly occurs in the north and eastern coastal area.
• Types of floods:
• Flash floods: come from thunderstorms
• Short-lived floods: only last a couple of days and they occur in shorter coastal streams.
In the economic perspective, these have the most damage, affecting the MAJOR river valleys.
• Long-lived floods: include heavy rains in the summer, in the area of Queensland.
It could take a couple of months for these types of floods to move down to water systems, such as Lake Eyre.
Australian tropical savannas receive most droughts in eastern Queensland; drought has affected this area since about 2000.
metal resources in savannas include: copper , bauxite, diamonds, mineral sands, phosphate rock, silica.
Large river systems:
Mitchell, Gregory and Leichhardt in northern Quensland, the Daly and Victoria in the northern Teritory, and the Ord, Fitzroy, Fortescue, Gascoyne, in Western Australia.
Also many flowing rivers like Cooper reek flows into Lake Eyre.
Wetland types found:
flood basins and plains, estuaries and sea-grass beds, lagoons, mangroves, waterfalls, streams.
the northern savannas get regular fire that occur during the wet season; southern part of Australia gets the more intense bush fires
laterirtic soils, cracking clays, sands, and of course grasslands. (grasslands are the most fertile soil types found in Northern Australia)
Intense sunlgiht, which is why savannas could be considered some of the hottest regions in the world..
Sun provides daylight for animals active during the day
Tropical savanna plants use photosynthesis to transom CO2 into foods.
Plants receive 10 to 12 hours of sunlight daily
"Savanna Explorer - Discover the People and Landscapes of Northern Australia." Savanna Explorer - Discover the People and Landscapes of Northern Australia. N.p., n.d. Web. 02 Apr. 2014.
"Australian Savanna Climate." Australian Savanna Climate. N.p., n.d. Web. 02 Apr. 2014.
ph ranges from 5.5-9
"Savanna." Wikipedia. Wikimedia Foundation, 04 Feb. 2014. Web. 02 Apr. 2014.
"Savanna_australia." Savanna_australia. N.p., n.d. Web. 02 Apr. 2014.
Australian Tropical Savanna