It soon became obvious, however, that the introduction of commercial television indirectly threatened the position and security of the BBC.

In 1981 a research study showed that the habitat destruction and the introduction of the non-native fish threatened the dace.

The introduction of Oriental bittersweet into new areas threatens the local flora because the native plants then have a strong competitor in the vicinity.

In the wild, the introduction of feral cats during human settlement can threaten native species with extinction.

In the case of the rare hooded crane, the introduction of a foreign herpes virus has threatened the remaining wild population.

Such introductions threaten to establish this agricultural pest in North America.

But human habitation and the introduction of non-native species have threatened its indigenous flora and fauna.

But its introduction threatens the beginning of the end of Detroit's unquestioned dominance of the pickup truck market.

The introduction of non-native species of plants has also threatened the species population.

Human encroachment, civil unrest and the introduction of non-native species threatens biodiversity in Africa.