Well this is quiet a simple question. As the human population grows it needs more resources in order to maintain it. More food, water and land is required.
In order to create these resources forests and wild areas need to be destroyed so that farm land, living space and dumping areas can be created.(Humans cause a lot of refuse and junk) Less space for the animals to live means that there is more competition for resources in the animal kingdom. The animals that can not find food starve and eventually die.
war and active laws in the past
economic causes
There are a couple of animal populations that were not affected by an increase is the krill population. Cobras were not affected.
well, i think it is due to the killing on them.
A natural cause of decline in a population could be disease outbreak or an epidemic. Diseases can spread rapidly through a population, resulting in a significant decrease in the number of individuals. This decline in population can occur in both plants and animal species.
The humans are cutting down trees and forests relentlessly to make more place for human settlements and agriculture. This leads to the wild animals leaving their natural habitats as well as their food source. Not only this but the humans are also hunting and poaching the animals illegally for their skins and horns which are considered valuable. These activities paves the way for the decline of the animal population. Also due to the global warming and green house effect the polar ice caps are melting, forcing the animals to leave which also leads to the decline in animal population.
Because of- 1. Overhunting 2. Pollution 3. Loss or change in habitats 4. Global warming 5. Climate change 6. Deforestation 7. Natural disasters
The factor primarily responsible is loss of habitat by deforestation and the advance of human habitation with subsequent loss of prey or of vegetation that serves as food. Other factors are the hunt by humans, either for 'bush meat' or for skin, horns or tusks.
An increase in the availability of food, a decrease in predation pressure, or an improvement in reproductive success are factors that can lead to an increase in the size of an animal population.
It means breeding. Helps to increase the population of animals.
The animal is the Tasmanian Devil (Sarcophilus harissii), which is sadly suffereing a dramatic population decline thanks to facial tumours.
The population goes down from the organism dieing of disease and the other animals that eats that will die and the things that and the animal that it eats will go up and there will be tons of them!