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Factors make species prone to extinction

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Maggie Zhu

on 19 September 2013

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Transcript of Factors make species prone to extinction

Factors make species prone to extinction
Not all species are made to extinct, but through their ecology or behaviour, they place themselves more at risk.
Small population size and limited distribution
Any change in habitat or small dip in their population can elimate them. For example, the slender billed grackle near Mexico city. Species with small population are likely to be extinct as well due to their inability of adpoting new conditions.
Habitat specialists
Special organisms with a unique diet are threatened are also under threat. For example, the palila bird which is dependent on the mamane tree but the trees are been cut down. Others like panda and kolala.
Low reproductive capacity
Species who lives for a long time tend to have low reproductive rate, makes them vulnerable to extinction. If there's predator or change in the habitat, the specie won't be able to replace their number because they are very slow. For example, the Steller's sea cow.
Poor competitors
Flightless and slow moving birds like the great auk and the dodo, they easy to eliminate because of the pressure of hunting and predation. Lack of mobility and poor defence make them vulnerable.
Large mammals
Because they are already a significant source of meat, large animals are vulnerable to over hunting. If their habitat is reduced, these animals often found it quite difficult to survive or even find any food. Many large mammals are endangered.
Wild animals and plants have a value as food, pets, ceremonial objects or marketable products are at risk from humans. Animals such as monkeys, forest antelope and chimpanzees are often hunted for markets as bushmeat. Huia birds and paradise birds are hunted for their feathers.
Altruistic species
Some animals developed bonds between themselves to fight off predators. However, when confronted with hunters with guns, animals which come to the aid of hunted mates are easily killed. Wolves, gorillas, whales and elephants, all refuse to leave their wounded companions and are often killed themselves.
Species that require large number of their own kind for protection or to locate food are vulnerable to extinction. For example, pigeons can only survive in a huge group, flocking and seeking food sources. When food reduced, they splited, eventally population died out.
Position in food chain
Top predators are sensitive to any disturbance in the food chain and therefore any reduction in population can cause disastrous consequence. Any plants or animals who is rare, has a restricted distribution, has a high specialised habitat or niche, or low productivity potential are prone to extinction
Valuable products
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