Keystone species video DBA

Why do you think herbivores (plant eaters) don't just eat all the leaves until the plants die?

This is your opinion. There are no right or wrong answers.

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What do you think happened after the scientist removed all the starfish from some tidepools?

This is a prediction; there are no right or wrong answers.

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What happened in the tidepools without starfish?

• The number of species increased

• The number of species decreased

• The species that the starfish used to eat increased in number

• There was little change in the number of individuals or species

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True or False: All species in an ecosystem have the same impact on their ecosystem.

• True

• False

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How could the scientists compare ecosystems WITH sea otters to ecosystems WITHOUT sea otters?

• They hunted or moved all the sea otters at some locations and compared those areas to places that still had sea otters.

• They found islands that never had sea otters in the past and compared them to ecosystems that currently have sea otters

• Sea otters nearly went extinct from fur hunting, so there were islands that USED to have sea otters in the past, but didn't have them anymore

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How do sea otters impact kelp forests in Alaska?

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Why did orcas start eating more sea otters?

• Humans hunted too many whales, which the orcas usually eat

• Humans hunted orcas, so they hid in areas with lots of sea otters

• Orcas decided that sea otters were easier to catch than their usual prey (whales)

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