Ecology #4: Populations

Which of the following is NOT an example of a Density Dependent Factor?

• Parasitism

• Natural Disasters

• Predation

• Competition

A density-dependent limiting factor only becomes limiting if:

• A population begins to decrease in size.

• Random events occur in nature.

• There are predator-prey interactions.

• A population reaches its carrying capacity.

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The movement of individuals into an area is known as:

• Supplementation

• Emigration

• Immigration

• Eradication

In a given area, if the population of predators increases, the population of prey will _____________.

• increase

• decrease

• remain about the same

• go extinct

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Which factor would contribute to an exponential growth rate in a given population?

• higher death rates

• less competition

• less resources

• lower birth rates

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All of the following are density-independent factors except:

• seasonal changes

• hurricanes

• less space

• deforestation

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If a population grows larger than the carrying capacity:

• birthrate may rise

• birthrate must fall

• birth and death rates remain the same

• death rate must fall

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What is the carrying capacity for this sheep population?

• 1.9 million

• 1.6 million

• 1.25 million

• 1.0 million

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

• The population continues to grow

• The population will go extinct due to limited resources

• The population starts to die off to return to carrying capacity

• The population grows, then finds a new carrying capacity

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Scientists observed that the populations of top-level consumers in a particular ecosystem were rapidly decreasing. Further studies revealed that there was also a decline in producer productivity. Which other changes did the scientists MOST LIKELY observe in the ecosystem?

• Increased producer diversity

• Decreased population size at all levels

• Decreased primary consumer populations only

• Increased primary and secondary consumer diversity

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