Sunday, September 23, 2012

Autobiography of an exinct animal

My name is  Thylacine.  Some people call me Tasmanian tiger because I have  striped back . Some people call me  Tasmanian wolf . May be I look like a wolf. Do I ?
I was a native of continental Australia. My relatives lived in Tasmania and New Guinea too . Tasmania and New Guinea are islands and are part of Australia.  
I was the largest known carnivorous marsupial of modern times. Do you know what a Marsupial is? Marsupials are kind of mammals whose babies are born incompletely developed and are typically carried and suckled in a pouch on the mother's belly.
Our species , that is the  modern thylacine , first appeared on the earth about 4 million years ago.
Location and Habitat
We originally used to roam all over the mainland of Australia, but was confined to the island of Tasmania for the last 3,000 years. We used to live in forest and scrubland close to our grazing preys like wallabies.
Appearance
Let me tell you how I look. 
I resembled a large, short-haired dog with a stiff tail similar to that of a Kangaroo. My body colour was yellow-brown with  dark stripes half way down my back  which got me the nickname, "Tiger”. I had dense and soft hair in my body. My ears were erect and rounded and  about 8 cm long . My belly was cream-coloured. We typically had a length of 1 to 1.3 m and our tail was about half a metre. Our height was about 60 cm and we weighed about 20 to 30 kg.
We were one among the two marsupials to have a pouch in both male and female. The other is the water opossum. The female had a backward facing pouch. The male thylacine had a pouch that act as a protective sheath, covering the male's external reproductive organs while he runs through thick bush.
You know one interesting thing ? I could open my jaw upto 120 degrees and I had 46 teeth !!!!!
Diet
 Do you know what I used to eat?
I was a carnivorous animal. I was a nocturnal hunter hunting other marsupials like wallabies, smaller animals like rodent and also sheep. I hunted at night by smell using my pace and stamina to run down smaller animals until they became tired. I used to use my wide opening jaws to rip out its preys neck .I liked to feed only  from the fresh kill.
 Breeding
 We, the Thylacines typically used to breed once a year, with the young being carried in their mother’s backward facing pouch. After approximately 6-8 months the young ones too big for the pouch were left alone in a sheltered place while their mothers went for food.
Why did we become extinct?
We were living happily. That is when the most unfortunate things happened to us,

A wild dog called “dingo” arrived in mainland of Australia. We had to compete with him for food. The dingo hunted for the same food, but was a lot more efficient and adaptable. Slowly we became extinct about 2000 years ago.
Although we were extinct in the mainland of Australia, we survived in Tasmania till 1930.  European settlers were there in Tsmania. The introduction of sheep in 1824 led to conflict between the settlers and thylacines. We were blamed for killing their sheep. Government offered rewards to people for killing us. There were other reasons too for our extinction.
We had to compete with wild dogs introduced by European settlers; we lost most of our habitats due to grazing and farming. There was some disease  too that killed some of us.
We became extremely rare by late 1920’s.
The last known Thylacine to be killed in the wild was killed in 1930 by Wilf Batty, a farmer from Tasmania.
The last captive thylacine, later referred to as "Benjamin" was captured in 1933 sent to the Hobart Zoo where it lived for three years. This thylacine died on 7 September 1936. It is believed to have died as the result of neglect—locked out of its sheltered sleeping quarters, it was exposed to a rare occurrence of extreme Tasmanian weather: extreme heat during the day and freezing temperatures at night. To commemorate our loss 7th September is declared as 'Threatened Species Day'  in Tasmania . This is to raise awareness of all the threatened species in the world, and to encourage action.
We held the status of endangered species until the 1980s.But nobody could confirm our existence. So  Tasmanian government declared as extinct in 1986.
Today our pictures have been used extensively as a symbol of Tasmania. I am featured on the officialTasmanian coat of arms and also on the official logos of Tourism Tasmania.Since 1998, my picture has been prominently displayed on Tasmanian vehicle number plates.
We remain now only in pictures. That is my story friends. So , dear friends, I would like to conclude with this small piece of advice.
Every creature has as much right to  life as you do. So, protect and care for them.
PLEASE DON'T SHOOT animals WITH GUNS, DO WITH CAMERAS IF YOU WANT.

Thursday, September 13, 2012

Symbiotic Relationships

Symbiotic relationship is defined as  a relationship between two organisms in which the organisms benefit from one another. This relationship could be between a plant and another plant , between a plant and an animal and between animals. Some of the examples are given below.

No Fungus, No Tree ( Symbiotic relationship between plants and Fungus)

 mushrooms

 

Plants and fungi occupy completely different categories in taxonomy. Yet their lives are so utterly entwined that about 90 percent of all the plants in the world have their own fungal “partners” that allow them to survive. The fungus in question is “ mycorrhizal”. Many mycorrhizal varieties live in close association with trees and other plants, drawing in nutrients from deep underground and providing them to the tree in exchange for a share of the energy (in the form of sugars) produced by the tree’s photosynthesis. The mushrooms and toadstools (An inedible or poisonous fungus with an umbrella-shaped fruiting body) often seen around the bases of trees are actually the reproductive organs of vast subterranean fungal networks that plants tap into in order to gain nutrients more efficiently.

Plovers and Crocodiles ( Symbiotic relationship between animals)



It looks like something out of a storybook – and in fact it can be traced back to accounts told thousands of years ago – a crocodile opens its mouth, invites a bird in before … what?  ::Chomp:: it swallows the sap alive? Amazingly, the crocodile remains still while the plover picks meat from its mouth. This cleans the crocodile’s teeth and prevents infection while providing a somewhat scary meal for the hungry bird.
It looks like something out of a storybook – and in fact it can be traced back to accounts told thousands of years ago – a crocodile opens its mouth, invites a bird in before … what?  ::Chomp:: it swallows the sap alive? Amazingly, the crocodile remains still while the plover picks meat from its mouth. This cleans the crocodile’s teeth and prevents infection while providing a somewhat scary meal for the hungry bird.


Anglerfish And Bacteria ( Animal and Bacteria)


Animals which produce light directly are known as producing Bio luminescence. Angler fishes are different. They do not produce the light with their own bodies like fire flies, rather they have a unique relationship with bacteria called symbiosis, and the bacteria actually produce the light for the angler-fish. This symbiotic relationship is called bio-luminescence.

Bugs, Bats, Birds and Flowers (Symbiotic relationship between plants and animals)

Many plants depend on animals to help them get pollen from the stamen of one plant to the ovum of another plant. These plants have evolved flowers that attract pollinators either by color or scent. In a symbiotic relationship, the flower contains nectar, a sweet, energy-rich material that gives the insect, bat or bird a nutritional benefit. When the animal moves on to the next flower for more nectar, it inadvertently carries pollen there, accomplishing the plant’s goal of pollination. Some animals have evolved very specialized features, such as shaped beaks or proboscises, to withdraw nectar efficiently. The flowers, in turn, may be specifically shaped to only allow a certain species of animal to get nectar from them. This allows the plant to monopolize that animal’s pollination efforts, since it won’t be flitting around to other species of plant.

Plant or Animal?

See full size image
                          
  

One of the strangest cases of symbiosis is that of the acoel flatworm, Convoluta roscoffensis. These tiny worms live along shorelines and look like masses of seaweed. The worms themselves are transparent, but within them live Platymonas algae, which contain chlorophyll and are capable of photosynthesis. They give the worms a green color.



The algae absorb sunlight through the worms’ clear skin and photosynthesize food -- enough foodthat the worms have no functioning digestive tract or even working mouths. The algae even recycle the worms’ waste products, and go through entire life cycles inside the worms’ bodies.

More symbiotic relationships - Please refer to

1. http://webecoist.momtastic.com/2009/03/01/symbiotic-bird-animal-relationships/

2. http://science.howstuffworks.com/environmental/life/evolution/symbiosis.htm