Give an example of a nonnative species that was introduced into an ecosystem that had a negative impact on the indigenous (native) species and describe what happened.

The Gypsy Moth, Nutria, Zebra Mussel, Hydrilla, Sea Lamprey and Kudzu are examples of non-natives that have caused massive economic and ecological losses in new locations because the natural controls of their native ecosystems were not there.

Non-native species can provide services useful to humans, particularly in facilitating many contemporary needs of ... For example, D. polymorpha has both numerous negative and positive effects on natural ecosystems.

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desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.