Nonnative Species In Aquatic Ecosystems Answers

Nonnative species disrupt the natural variability of an ecosystem.

Cane toads are highly successful as an invasive species in Australia because there is only one species that is believed to be able to prey on them.

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.

All nonnative species in an ecosystem are considered invasive species.

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.

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.

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

Hull fouling is a(n) _______ introduction of nonnative species.a.unintentionalb.intentionalc.unimportantd.land-based

Introducing invasive species to an ecosystem results in an increase in biodiversity.

Nonnative species are only introduced unintentionally.