The tall wetland plant, purple loosestrife, was brought from Europe to the United States in the early 1800s as a garden plant. The plant's growth is now so widespread across the United States that it is crowding out a number of native plants. This situation is an example of
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Step 1: Purple loosestrife, a tall wetland plant, was brought from Europe to the United States in the early 1800s as a garden plant. Show more…
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A marsh supports a large population of cattails, which are tall wetland plants. Purple loosestrife, an invasive wetland plant, is introduced to the marsh. Both purple loosestrife and cattails require access to sunlight and space along the floor of the marsh to grow. What effect will the growth of purple loosestrife have on the marsh's carrying capacity for cattails? A. The carrying capacity will decrease because the cattails will have increased competition for resources. B. The carrying capacity will increase because invasive species are typically beneficial to ecosystems. C. The carrying capacity will increase because the cattails can use resources produced by purple loosestrife. D. The carrying capacity will decrease because invasive species are typically predators of native species.
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In the chaparral ecosystem, which we have here in Southern California, there is not enough rainfall to support dense plant growth. Consequently, plants do not grow very close together, in part because a plant that takes root and grows sends chemical signals that inhibit growth of other plants.
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People often move plants from one part of the world to another. Sometimes, an introduced plant species can become invasive, taking over native plant populations. The U.S. Department of Agriculture manages the National Invasive Species Information Center, whose website maintains a list of invasive plants. Which plant species are considered invasive in your home state? Why are those species harmful? Should invasive plants be eradicated? How?
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