Ships that use ballast water are not in danger of introducing invasive species into aquatic habitats.
Why does the aquarium trade contribute to the introduction of nonnative species?a.Exotic species can escape or be released into local ecosystems.b.Aquarium owners do not always understand how ecosystems interact.c.Nonnative fish are shipped worldwide for aquariums.d.All of the above
Nonnative species disrupt the natural variability of an ecosystem.
Why might it be beneficial to regulate what species of plants and animals people are allowed to own in particular environments?a.Some species might become invasive and destructive if they escaped.b.Some species may be dangerous to humans.c.Nonnative plants and animals should only be used for commercial purposes.d.There is no reason to restrict an individuals’ right to own plants or animals.
Why has the spread of the herbicide-resistant hydrilla through Florida’s waterways resulted in them no longer being navigable by most boats?a.Thy hydrilla has induced a drought that drained the waterways.b.The weed clogs propellers that boats use for propulsion.c.The sticky leaves of the weed hold boats in place.d.All of the above
Which of the following is not true concerning the zebra mussel in the United States?a.It was introduced accidentally.b.It was first introduced in the Great Lakes.c.It is still spreading throughout the United States.d.It can be eliminated from a river with minimal effort.
Which of the following is an example of mechanical control of nonnative species?a.pesticidesb.herbicidesc.net barriersd.inspections
Which of the following is true concerning hull fouling from commercial shipping and recreational boating?a.It constitutes less than half of all nonnative species introductions.b.The revenue brought in from these industries is relatively small.c.It is difficult to prevent since ship hulls begin, conduct, and end voyages in water.d.It is best combated by chemical treatments.
Hull fouling is a(n) _______ introduction of nonnative species.a.unintentionalb.intentionalc.unimportantd.land-based
The rusty crayfish is harmful to native species of crayfish because it clear cuts the bottom of waterways leaving native species without a food supply.
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