What problems arise when a species is introduced from a foreign ...

[Bernana]

What problems arise when a species is introduced from a foreign ecosystem? Why do these problems occur?
 
  What will be an ideal response?

Question 2

What is meant by territoriality, and how does it limit the effects of competition in nature?
 
  What will be an ideal response?

[Carliemb17]

Answer to Question 1

Introducing species into foreign ecosystems alter(s) community and population ecology relationships such as competition and predation. These problems can occur because an introduced species typically does not have predators, parasites, and/or grazers. A non-native plant may also release chemicals that exclude native species. A non-native species may find the environment favorable for survival but it is unlikely that it fits in the framework of relationships in the new biotic community.
Examples of exotic species include rabbits introduced into Australia, and chestnut blight, Japanese beetles, fire ants, gypsy moth, zebra mussel, kudzu, and spotted knapweed and purple loosestrife introduced into the United States.

Answer to Question 2

Territoriality refers to individuals or groups defending a territory against the encroachment of others of the same species. It is a form of intraspecific competition. By establishing a territory, a nesting area or adequate food resources are being defended against others' use. When populations are high some individuals are unable to secure nest sites or areas with adequate food resources, thus limiting the size of a population.