An ecologist studying the spread of Purple loosestrife, an invasive plant species into a field would not expect species diversity in the field.
Invasive species are species which are not originally found in a given habitat but which when introduced take over and become the dominant species in that habitat.
An ecologist studying the spread of Purple loosestrife, an invasive plant in Wisconsin, into a field would not expect a large number of other species of plants in the field.
In conclusion, invasive species dominate when introduced into a habitat.
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