Commercial hunting 23% Habitat alteration 40% Competition with introduced species 16% Pest control 7% Pollution 1% Hunted for food 6% Killed because of Captured to serve superstition 2% as pets 5% Causes of Extinction Many organisms have become extinct as a result of human activities On a worldwide basis, the most important of these activities is the destruction of habitat by humans modifying the environment for their own purposes
Causes of Extinction Causes of Extinction Many organisms have become extinct as a result of human activities. On a worldwide basis, the most important of these activities is the destruction of habitat by humans modifying the environment for their own purposes
>.05% net decrease in forest area per year >.05% net increase in forest area per year Note: Map shows the location of in countries that have the highest and lowest rates of net change in forest area Other forests are shown in lighte Annual Change in Forest Area 1990-2000 Yearly Change Tropical areas 14.2 million hectares(about the and area of lowa Non-tropical areas +1.7 million hectares -12.5 million hectares Changes in Forest Area Most tropical forests in Central America, Africa, and much of Asia are being lost, while non-tropical areas are holding their own or growing
Changes in Forest Area Changes in Forest Area Most tropical forests in Central America, Africa, and much of Asia are being lost, while non-tropical areas are holding their own or growing
A Specialized marsupial - the Numbat this small marsupial mammal requires termite- and ant-infested trees for its survival. termites serve as food, and the hollow limes and logs provide hiding places. Loss of old-growth forests with diseased trees will lead to the numbat' s extinction
A Specialized Marsupial A Specialized Marsupial – the Numbat This small marsupial mammal requires termite- and ant-infested trees for its survival. Termites serve as food, and the hollow limes and logs provide hiding places. Loss of old-growth forests with diseased trees will lead to the numbat’s extinction