Trophic Cascades and Keystone Species

Why did the vegetation on the Aleutian islands grow sparse?

• indirect negative impact of the fox population on the seabirds

• direct negative impact of the fox population on the seabirds

• direct positive impact of the seabirds on vegetation

• direct negative impact of the seabirds on the foxes

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Which of the following brought direct negative impacts of the next trophic level?

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NGSS.MS-LS2-3

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Which of the following was affected by the loss of the otters?

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NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

A keystone species is a species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.

Which of the following is/are (a) keystone species?

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NGSS.MS-LS2-1

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What would happen to an ECOSYSTEM if a KEYSTONE SPECIES DISAPPEARED?

• It would COLLAPSE or not be able to survive.

• It would help SUSTAIN the ecosystem.

• The FOOD WEB would stay the same.

• MIGRATORY species would arrive and take over.

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NGSS.MS-LS2-2

NGSS.MS-LS2-3

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A species that maintain biodiversity by keeping prey populations controlled are called...

• Introduced Species

• Apex Predators

• Invasive Species

• Keystone Species

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NGSS.MS-LS2-4

Based on the graph shown, what is the effect of removing a keystone species from an ecosystem?

• biodiversity goes up

• biodiversity goes down

• biodiversity stays about the same

• not enough information to tell

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NGSS.MS-LS2-4

NGSS.MS-LS2-5

Based on the graph shown, how can you tell sea otters are a keystone species?

• as the sea otter population decreases, biodiversity increases

• as sea otter population increases, biodiversity increases

• changes in the sea otter population have little effect on biodiversity 

• the sea otter population dereases due to the presence of urchins

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

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Trophic cascades refer to...

• impacts that reach beyond adjacent trophic levels.

• impacts that reach the adjacent trophic level.

• impacts that reach only one trophic level.

• impacts that reach the top trophic level

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

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in 1995 Wolves were reintroduced to Yellowstone National Park. Which answer below most accurately describes a possible trophic cascade the could result from the reintroduction of wolves?

• wolves reintroduced-> deer population increased -> tree and vegetation cover decreased

• wolves reintroduced-> beaver population decreased -> tree and vegetation cover increased

• wolves reintroduced-> deer population decreased -> tree and vegetation cover increased -> beaver population increased

• wolves reintroduced-> deer population decreased -> beaver population decreased -> songbird population increased

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4