European rabbits were introduced into australia and quickly spread, reproduced, and became a terrible pest. they eat up to $600 million worth of food and pasture crops annually, and have damaged the populations of many native plants and the populations of animals that eat the plants. twice in the past 50 years, rabbit diseases have been introduced to try to control the population, with some success. this is a case where

This is a case where AN INVASIVE SPECIE HAS REDUCED THE GENETIC DIVERSITY OF INDIGENOUS SPECIE.
An invasive specie is an animal specie that is brought from another ecosystem and is introduced to a new ecosystem. Such invasive species may throw their new habitat into an imbalance as a result of the manner in which they interact with the components of the ecosystem that has been existing in the ecosystem before and that is what happen in the scenario given above.