Population Dynamics

What is an invasive species?

• An organism that is new to an environment that has positive effects on the environment.

• An organism that is native to an environment that has negative effects on the environment.

• An organism that is new to an environment that has negative effects on the environment.

When a population grows past the ecosystem's carrying capacity, what happens to the population?

• Continues to grow
• The population starts to die off to return to carrying capcity
• The population will go extinct due to lack of resources
• The population grows then finds a new carrying capacity

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Is a fungal infection in frogs considered biotic or abiotic?

• biotic
• abiotic

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What is the carrying capacity of the graph?

• around 500
• more than 500
• less than 500
• around 600

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If wolves were re-introduced what would happen to the moose population

• The moose would go extinct from over hunting
• The wolf population would take over the island
• The moose population would decline to normal levels
• The moose would adapt to other environments

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Review the graph provided. What statements can be made about the significant decline in wolves around 1979?

• The wolf decline was a direct result of moose decline.

• The is no way to know why the wolf population dropped.

• The drop is most likely due to the declining moose population, but more information would be needed to determine that.

• The drop is most likely due to the increasing moose population, but more information would be needed to determine that.

• The wolf decline was a direct result of the moose increase.

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Which statement correctly explains why one of the species is more likely to survive an environmental change?

• Species 1 because it has fewer genes

• Species 2 because it has more genes

• Species 1 because it has less genetic diversity

• Species 2 because it has greater genetic diversity

A desert lake has evaporated to half its original size over the past 50 years. This caused a large increase in the lake's salt concentration. Over these 50 years, scientists have observed a decrease in the population of one fish species and an increase in the population of a shrimp species. Which hypothesis about the organisms ability to live with the salt concentration does the evidence suport

• The fish are better able to live in areas of high salt concentration
• Neither the shrimp nor the fish are able to live in areas of high salt concentration
• Both the shrimp and the fish are equally able to live in areas of high salt concentration
• The shrimp are better able to live in areas of high salt concentration

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Highways allow people to travel between towns and cities. These highways also divide ecosystems into smaller pieces. Animals can become separated from lakes they use for breeding. For example, tiger salamanders travel long distances to breed at lakes. How could highway systems affect animals such as tiger salamanders?

• Tiger salamanders may be cut off from important resources
• Tiger salamander could improve their ability to remember roads
• Tiger salamander's habitat within ecosystems could become larger
• Tiger salamanders habitat may be exposed to less pollution

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