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Concept of past enviroments
Transcript of Concept of past enviroments
What is happening with Australia's Biodiversity?
Biodiversity in Australia has been decreasing since the arrival of Europeans. The increased rate of human growth is one of the main factors of loss of biodiversity. Humans increased the rate of hunting, urbanization and land clearing; leading to a decreasing amount animals.
Impact of human activities
It is thought that the extinction of many Australian Megafauna occurred at the time humans first arrived on the continent. As the Megafauna were big and slow, they were vulnerable to hunting.
Increase in carbon in fossils 130000 years ago indicates increase in fire. The introduction of fire led to the evolution of fire resistant plant species.
Why is biodiversity important
Biodiversity boosts ecosystem productivity; Greater species diversity ensures natural sustainability for all life forms. If biodiversity decreases, it increases the chances of extinction for certain specific species.
The river is like our refrigerator that keeps fresh the meat. The forest is like our drug store that has our medicines. It is like a supermarket with all of the food and things we need. Why would we poison our water or clear the forest?
Paiakan, a Kayapo Indian, Quoted in Knudtson and Suzuki, Wisdom of the Elders, 1992
Palaeontology is the study of fossil that tells us about the ecology of the past about the evolution.
Palaeontologists use methods like The study of fossil pollens, spores, aquatic organisms and corals, and analysis of the rock types present in sedimentary layers, to determine past environments.
Efforts to monitor biodiversity.
As people grew more aware of the loss of biodiversity, people started to take actions to stop this from happening. Farmers who uses cross breeding have started to preserve seeds of all variety to make sure genetic information is not lost, this is called a seed bank.
Concepts of past environments
What is Biodiversity?
Biodiversity is the variety of all living things; the different plants, animals and, the genetic information they contain and the ecosystems they form. Biodiversity also refers to the incredible variety of life; from large to small and common to rare
Before Australia broke up from Gondwana, the climate was cool and wet; with rapid growth of rainforests and a larger range of biodiversity.
Megafauna and Dinosaurs also existed when Australia was a part of Gondwana.