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Nonnative Species In Aquatic Ecosystems Answers

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1
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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.
2
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All nonnative species in an ecosystem are considered invasive species.

A
T
B
F
3

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
4

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.
5

Nonnative species are only introduced unintentionally.

A
T
B
F
6

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.
7

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
8

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

A
unintentional
B
intentional
C
unimportant
D
land-based
9

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.

A
T
B
F
10

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

A
pesticides
B
herbicides
C
net barriers
D
inspections
11

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

A
T
B
F
12

Nonnative species disrupt the natural variability of an ecosystem.

A
T
B
F
13

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.
14

Which of the following is not true about nonnative species?

A
They can have positive impacts on an ecosystem.
B
They can have negative impacts on an ecosystem.
C
They can be introduced within their natural range.
D
A nonnative species can be an invasive species.
15

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.

A
T
B
F
16

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

A
T
B
F
17

All nonnative species in an ecosystem are considered invasive species.

A
T
B
F
18

Which of the following is not true about nonnative species?

A
They can have positive impacts on an ecosystem.
B
They can have negative impacts on an ecosystem.
C
They can be introduced within their natural range.
D
A nonnative species can be an invasive species.
19

Invasive species often unbalance the ecosystems into which they are introduced because _______.

A
they did not co-evolve with the natural species and lack natural controls, like predators
B
they breed quickly and have the potential to overpopulate an area
C
they consume local resources
D
none of the above
20

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

A
They are destructive to native species and have no natural predators.
B
They reproduce more quickly than native species.
C
They have venom glands.
D
Large adult specimens are able to hunt snakes.

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