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.
A comparison of alloploidy (seen in species hybrids) and new allopolyploid species.
Relationship between fruit radius and beak length in populations of native and introduced species of
Roots of the keystone species hypothesis: does a higher proportion of predators in diverse communiti
European scops owl and the extinct Otus mauli species from Madeira.
Linear programming problems using the simplex method.