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Lake Eyre

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by

Yzzie Preller

on 19 October 2012

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Transcript of Lake Eyre

Lake Eyre Lake Location Biotic Abiotic Food Web Adaption of Species Threatened Species Threats to Ecosystem Is located in the Simpson Desert in South Australia.
Lake Eyre is the largest in Australia
It is 9500 square metres
No other salt lake floods in australia besides Lake Eyre
Is 15.2m below sea level
The Lowest rainfall in australia occurs in lake Eyre basin.the annual rainfall averages at 100-140ml Fish & Crustaceans
Australian Pelicans
Native waterbirds
Algae
Bacteria The Abiotic features of lake Eyre Are:
Temperature- lake Eyre has a reasonably hot climate through out the year with temperatures on average of 18oC and 24oC during the winter and 36oC and 39oC in the Summer.
Light-Sun - With the Lake stituated in the desert, there is very little rainfall, hence, very little cloud cover allowing sunlight to be continuous. The annual amount of sunlight lake Eyre recieves may vary from 3250 to over 3500 hours.
Salinity- during the process of flooding the salinity levels in the water increase as the salt crust is dissolved into the water, but when the lake reaches maximum capacity salinity levels are that of normal sea salt levels. Also when the water slowly evaporates, the salinity increases as the water proportionately decreases.
pH levels of soil- pH levels of lake Eyre range from close to pure water ( 7.1, water = 7.0) to midley alkaline (8.0). Sea Water has a pH level of 8.0
Water- in flowing water from shallow springs can have tigh tenperatures ranging 30-40oC.
Wind- The wind that crosses Lake Eyre tends to be a Southerly wind until you start to head south west where the wind changes direction to become a westerly. This can be proved through the shape of the surrounding sand dunes and the direction they face.
Humidity- the humidity of lake Eyre during the later part of the day falls below 30% and as low as 20% in other parts. (cc) image by rocketboom on Flickr (cc) image by quoimedia on Flickr (cc) image by nuonsolarteam on Flickr Food Chain Flow of Energy Sun Algae Fish Pelican Dunaliella salina
bony bream.
Adapting to high concentrates of salt water, conservation of food,
ability to change breeding habits to cope with sudden floods Energy Flow Sun Flower Bug Food Chain There is little public awareness of the threats to this ecosystem, much of which is due to the location of the lake and how remote it is.
Feral animals such as wild donkies and camels and some domestic animals such as cattle graze on the little vegetation in the desert resulting in habitat loss for smaller desert rodents such as the Greater Bilby and the Kowari.
Cane Taods are now arriving to lake eyre coming down with the flow of the rivers.
give more competition for food
mine water pollution from queensland mines, carried down river, heavey presence of metals
http://australianmuseum.net.au/Ornithology-Collection-Eyrean-Grasswren Grey Falcon- the Grey Falcon is one of Australia's native endangered birds with just a small population of 1000. The Gray Falcon was originally only found in open woodland semi arid zones but started to move to arid zones such as lake Eyre where increases in numbers of desert rats and other small creatures came with the floods. After European settlement the Gray Falcon population depleted to where it stands now as only 1000. this population loss was due to land clearence in the woodland, and overgrazing in the arid zones.
Amperta- Is a small carnivorous marsupial that was placed on the endangered list after a big number loss. This is because of hapitat loss from overgrazing from sheep, cattle, camals, having feral cats, dingos, foxes, as their meal and changing fire reigemes.
Eyrean grasswren- small bird
Greater bilby- is endangered due to loss of habitat and competition with other species. Its biggest competition for food has come from the introduced rabbit. Rabbits also burrow where the bandicoots burrow, but their burrows tend to cause the collapse of the bilbies' burrows, resulting in the bilbies being trapped, and suffocating.
Kowari- over grazing, low reproduction rate
http://www.australianfauna.com/kowari.php
http://austhrutime.com/simpson_desert_national_park.htm
http://australianmuseum.net.au/Ornithology-Collection-Eyrean-Grasswren
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