Bio Koala Powerpoint 2
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Phascolarctos Cenereus
Ella Hubley
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Scientific name- phascolarctos cenereus “ash colored bear”
Fossils trace back 50,000 years ago--giant koalas
Europeans fur trade-almost extinct
Today, live on the coastal southern eastern region--New South Whales, Queensland, Victoria, South Australia
Now, “protected species”--suffers loss habitat and diseases such as Chlamydia(dieback, brushfires, drought,land clearing)
Extinction in Victoria-authorities relocate animals--increases numbers--inbreeding and over population occurs
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Taxonomy Kingdom: animalia
Phylum: Chordata (spinal chord)
Sub-phylum: Verbrata (backbone)
Class: Mammalia (feeds off memory gland/fur)
Sub-class: Marsupial (saftey pouch)
Order: Diprotodontia (sharp teeth lower jaw/ digits are together)
Sub Order: Vambatiformes( womabat left 2 of 7 known families)
Family: Phascolarctidae (only one left)
Sub Species- not identified as valid. Differ in states characterisitcs.North vs. South
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Characteristics
Herbivorous, arboreal,marsupial
-well adapted to life in trees--do not external tails--well balanced
Lean and muscular--strong limbs--low thigh to shin
Rough padded paws--five digits sharp claws--front 2 and 3--hind 1 and 4, two attached for grooming
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Fur-”raincoat”--woolly protection from extreme high and low temp. very thick and dense “cushion”
Mature males-brown scent gland
Individual fingerprints
Teeth-adapted to herbivorous diet--front cut--molars shear and chew--large diastema
Average size of a Queensland male- “buck” 14lbs-female “doe”-11lbs--24-33 in.
Keen sense--tell whose marked territory and toxicity
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Small brains-use less energy-adaptive quality to survive on low energy Low body temperature--36 degrees Celsius,slow metabolism.In temperatures above 77 degrees Ferenheit-use evaporative cooling-breathing rapidly-reduce water loss by the amount of water in their urine-in cold-shiver
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Behavior
Solitary animals-other than breeding seasonAdults occupy home ranges-range size depends on environment and social ranking--as little as 2.5 acres-half for a female--male live in only 12 diff. trees throughout life Dominant male overlap rangesWithin a stable social group- “food trees” “home trees”--trespassers attacked Young koala becomes sexually mature-disperse from mother’s home range
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Arnie’s home range-43 acres-travel in a single night during breeding season.
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CommunicationMales bellow--large distances--saves energy--social and physical position
Females not as often-aggression/sexual behavior--with babies annoyance
Both have same call- cry when feared or under stress
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DIET
Eucalyptus leaves contain approximately 50% water, 18% fibre, 13% tannins, 8% fat, 5% carbohydrates, 4% protein and 2% minerals.Contains cellulose-inedibleLarge caecum Digestive system-water loss
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BIRTH
Marsupial--live in pouch 6 to 7 monthsRides on backPap--in order to get the right digestive system for eucalyptus leaves
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Chlamydia
Most healthy koalas have antibodies--will not necessarily dieTransmitted through pap, mating, fightingCould be natural selection?Prevents trees from being over browsed
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Bibliography(“ANTARCTICA YIELDS FIRST LAND MAMMAL FOSSIL”By ROBERT REINHOLD, SPECIAL TO THE NEW YORK TIMES Published: March 21, 1982) (“Environmental assessment of koala’s conservation status, Australian Government website: www.environment.gov.au/minister/env) . (“Physical Characteristics of the Koala”, Australian Koala Foundation, www.savethekoalas.com/koalaphysic.html) (University of Queensland Koala Study Pogram: www.thekoala.com)(Hoff, Mary. Koalas, Creative Education, Mankato, Minnesota, 2006. 12) (“Fingerprint homoplasy: koalas and humans: www.koalaresearch.net.au)(www.koalaplayworld.com(Australian Marsupial & Monotreme Specialist Group, 2006 IUCN Red List of Threatened Species)