A) What is the difference between an introduced and an invasive species? (1 point)
An introduced species is added in by humans; an invasive species enters new ecosystems on its
own.
An introduced species is new to the ecosystem; an invasive species has been there a long time.
An introduced species is not necessarily harmful to the environment; an invasive species has a
negative effect.
An introduced species is brought in on purpose; an invasive species is brought in by accident.
Correct answer: An introduced species is added in by humans; an invasive species enters new ecosystems on its own.
A) What is species richness? (1 point)
the number of species in a community
the combined total of all individuals of each species in an ecosystem
the population size of each species in a community
the different types of species in an ecosystem
Correct answer: the number of species in a community
A) Due to climate change, places that used to be colder are now warming up, allowing new
invasive species to establish themselves. What is one way that warming conditions are
beneficial to invasive species? (1 point)
Warm weather allows animals to travel farther and longer because they do not need to hibernate
for winter.
If the location used to be too cold for non-native species, it is now warm enough to allow them to
exist.
Warming leads to longer life spans for the animals because none die due to exposure to the cold.
There is more food and shelter available since the growing season is year round.
Correct answer: If the location used to be too cold for non-native species, it is now warm enough to allow them to exist.
A) The Cuban treefrog invaded Florida in the 1930s and has since spread throughout the
southeastern U.S. It produces a “grating squawk” as a mating call. Their call drowns out the
mating calls of native frogs, hindering their ability to find a mate. Some frogs, like the Green
treefrog, changed their calls, but this also may reduce their ability to attract a mate if females
do not learn to recognize the new call.
How does the Cuban treefrog cause a reduction in biodiversity? (1 point)
It reduces biodiversity by reducing successful mating in native species.
It reduces biodiversity because it reproduces rapidly.
It reduces biodiversity by reducing food availability for native species.
It reduces biodiversity because it has no natural predators in the are
Correct answer: It reduces biodiversity by reducing successful mating in native species.
A)
Humans built dams, dikes, and levees to control water flow and flooding in the Florida
Everglades. This allowed us to expand urban and agricultural areas, but it also allowed
invasive species to take over and destroy habitat for native species, as well as reducing native
species ability to move to find resources and reproduce. Restoration efforts are under way to
allow for natural water drainage and to treat the water.
Which size impact does this human-led destruction of habitat have?
(1 point)
Medium because many species were impacted, but they are still surviving in the remaining
areas.
Large because it has led to several significant changes, including new invasive species and loss
of natives.
Small because they are restoring the original hydrology by removing interior canals.
Medium because only some species were affected by the changes.