Nonnative Species In Aquatic Ecosystems Answers

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Ships that use ballast water are not in danger of introducing invasive species into aquatic habitats.

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Which of the following is an example of mechanical control of nonnative species?

pesticides

herbicides

net barriers

inspections

Why are cane toads in Australia considered an invasive species rather than simply nonnative?

They are destructive to native species and have no natural predators.

They reproduce more quickly than native species.

They have venom glands.

Large adult specimens are able to hunt snakes.

All of the following are true of the Zebra mussels found in the Great Lakes EXCEPT:

Zebra mussels are having are having a negative impact on the native population of mussels in the region.

They were unintentionally introduced to the Great Lakes by humans.

Zebra mussels have caused a great deal of environmental damage to the area.

People of the Great Lake region are benefitting from the economic advantages of having zebra mussels in the region.

Which of the following is true concerning hull fouling from commercial shipping and recreational boating?

It constitutes less than half of all nonnative species introductions.

The revenue brought in from these industries is relatively small.

It is difficult to prevent since ship hulls begin, conduct, and end voyages in water.

It is best combated by chemical treatments.

Hull fouling is a(n) _______ introduction of nonnative species.

unintentional

intentional

unimportant

land-based

Why does the aquarium trade contribute to the introduction of nonnative species?

Exotic species can escape or be released into local ecosystems.

Aquarium owners do not always understand how ecosystems interact.

Nonnative fish are shipped worldwide for aquariums.

All of the above

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