The spread of these species is most likely due to overgrazing.

Soil erosion as a result of overgrazing is a growing problem.

Overgrazing can also lead to the degradation of the soil.

However, overgrazing and the expansion of agricultural land could cause this area to increase.

It was believed to have become extinct in the early 1950s as a result of overgrazing.

However, due to overgrazing, the dairy industry declined in the 1970s.

This generally leads to overgrazing and degradation of the land.

It is threatened by habitat loss due to fire and overgrazing.

However it is thought to be declining on the mainland because of overgrazing.

But overgrazing, while widespread, is just one reason for the heather's decline.

It was opposed by environmental groups, who say overgrazing is damaging public lands.

Many environmentalists also question whether it is a mistake to put too much of the blame on overgrazing.

These conflicts are complicated by problems of overgrazing and wildlife protection.

The Gaur population also doubled in recent years, with risk of overgrazing.

The failure of the rains led to overgrazing and deforestation.

Sampson's mission was to study the relationship between these disasters and overgrazing.

By the late 1880s, the species was probably extirpated from Arizona, perhaps as a result of overgrazing.

Overgrazing and deforestation are factors, but so is the rise in the world's temperature.

Its presence is often an indication of overgrazing or poor veld management.

However the drought of 1891-93 killed off over half the cattle and produced severe overgrazing.

Overgrazing can increase predation by making nests easier to find.

The guidelines are intended to limit overgrazing and abusive land practices.

Major causes of damage include farming, overgrazing and deforestation, the study said.

It is mostly dry country, and overgrazing can turn grassland into desert.

The area became almost desert-like after decades of overgrazing and was subsequently developed, he said.

They have their own community, actually, but it's not too far from here to walk, though the path is a bit overgrazed.

The spread of these species is most likely due to overgrazing.

The result of all these various changes has been serious overgrazing and environmental degradation.

Long-term overgrazing and fast population growth have made the problem worse.

In recent years, as the pastoral population rose to some 90,000 people, overgrazing has increased.

It may also be impacted by overgrazing in the area.

Overgrazing can also lead to the degradation of the soil.

Soil erosion as a result of overgrazing is a growing problem.

The weight of scientific evidence, they argue, shows that the range is not overgrazed.

Land clearing and overgrazing result in the degradation of a community.

Overgrazing is a large problem and another cause of desertification.

Threat from overgrazing by the domestic livestock is ever present.

Therefore, certain steps should be taken to prevent overgrazing by cattle.

However, due to overgrazing, the dairy industry declined in the 1970s.

However, overgrazing and the expansion of agricultural land could cause this area to increase.

It was believed to have become extinct in the early 1950s as a result of overgrazing.

Authorities say the animals threaten other local species through overgrazing.

However it is thought to be declining on the mainland because of overgrazing.

It is threatened by habitat loss due to fire and overgrazing.

This generally leads to overgrazing and degradation of the land.

For example, they might be overgrazed by livestock and urban development in nearby areas.

By 1912, however, much of the land was overgrazed.

The reasons given for the policy was overgrazing of the reservation by livestock.

There is no government in the world that can just let an area so important to conservation to be wasted away by overgrazing.

Some have argued that the species' range is expanding due to overgrazing.