Invasive and Keystone Species

How can humans help prevent the spread of invasive species?

• By cleaning boats, not releasing pets into the wild, and reporting sightings of invasive species.

• By planting more trees and creating wildlife reserves.

• By using pesticides indiscriminately in gardens and parks.

• By introducing more non-native species to local ecosystems.

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What do trophic cascades refer to?

• Impacts that reach beyond adjacent trophic levels.

• Effects that only occur within the same trophic level.

• Changes in population size of a single species.

• Direct interactions between predators and their prey.

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What is the difference between native and invasive species?

• Native species are organisms that naturally occur in an area, while invasive species are not native and can cause harm.

• Native species are always beneficial to the ecosystem, while invasive species are harmless.

• Native species can adapt to new environments, while invasive species cannot survive outside their native habitat.

• Native species are larger than invasive species, which are usually smaller.

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Give an example of an invasive species.

• Zebra mussel

• Goldfish

• Common carp

• Rainbow trout

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A species that is not native to an area is called:

• Invasive Species

• Endemic Species

• Native Species

• Migratory Species

Why are invasive species a concern for ecosystems?

• They can enhance biodiversity by introducing new species.

• They can outcompete native species for resources, disrupt food webs, and alter habitats.

• They have no significant impact on the environment.

• They can help in the conservation of native species.

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What is a keystone species?

• A species that has a disproportionately large effect on its environment relative to its abundance.

• A species that is the most abundant in an ecosystem.

• A species that is at the top of the food chain.

• A species that is endangered and at risk of extinction.

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How can invasive species affect the economy?

• They can lead to increased management costs and loss of revenue in industries like fishing and tourism.

• They can improve the efficiency of local industries and boost economic growth.

• They can create new job opportunities in the management of native species.

• They have no significant impact on the economy.

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Invasive species have a negative impact on...

• The ecosystem only.

• The economy only.

• Both the ecosystem and the economy.

• Human health.

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What is an invasive species?

• An organism that is native to an area and benefits the environment.

• An organism that is NOT native to an area and causes harm to the environment/humans.

• An organism that is found in multiple ecosystems without causing harm.

• An organism that is beneficial to humans and the environment.

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