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Exam 30: Ecology and Populations

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Question 21

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During a recent hurricane, 25 individuals of the same butterfly species were blown onto a barrier island in southern Florida. During the first year, 80 caterpillars hatched from eggs laid by the butterflies and only 5 individuals in the population died. What is the growth rate for the population during this period?

A) 1%
B) 3%
C) 10%
D) 30%
E) 400%

F) C) and D)
G) B) and D)

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Question 22

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Prairie dogs are highly social, burrow dwelling rodents. Families have a strict social hierarchy and their "towns" can span hundreds of acres. In one colony, 750 animals live in a 500m² area. What is the population density?

A) 15
B) 1.5
C) 150
D) 2.5
E) 25

F) A) and B)
G) All of the above

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Question 23

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Equilibrium populations tend to exhibit a Type III survivorship curve.

All of the following are true about equilibrium populations EXCEPT

When a population reaches the stable equilibrium phase, this is considered

During a recent hurricane, 25 individuals of the same butterfly species were blown onto a barrier island in southern Florida. After several years, the population stabilized with approximately 150 individuals. The butterflies and the flowers that they require for food would be considered an example of a(n) __________.

Figure: -Above is a life history table for a minnow (small fish) . Based on this table, how many years until the population drops to less than 50% of its original population?

Which of the following represents a Type II survivorship curve?

During a recent hurricane, 25 individuals of the same butterfly species were blown onto a barrier island in southern Florida. When the butterflies first arrived on the island they did not have to compete for access to food or space. In addition, there were few natural predators such as wasps and birds which were common on the mainland. As a result, the island population will have a __________ biotic potential compared to the mainland population.

If a population of 200 squirrels has a 10 percent growth rate each year, how many individuals will there born in the next year?

Which of the following is an example of exponential growth?

Which of the following is true about the majority of LDCs?

Which of the following is true about the current state of human population growth?

During a summer with lots of rain, the vegetation grew lush and the white-footed mouse populations increased due to increases in food availability. However, the next 2 summers were record drought years and food became increasingly scarce. Over these 2 years, the population size of the mice decreased due to increased competition for access to food. This increased competition is an example of

Honey bees have been declining at dramatic rates in the last few years. Colony collapse disorder has been linked to a virus and results in hives completely emptied of bees among both wild populations and domestic hives. Recently, scientists have suggested that infected bees may contaminate flowers that they visit and thus spread the disease. This is an example of a(n) ________________.

Meghan is studying interactions between caribou and their wolf predators. This is an example of ___________ ecology.

Figure: -Above is a life history table for a minnow (small fish) . Based on this table, what type of survivorship curve do these animals have?

During a recent hurricane, 25 individuals of the same butterfly species were blown onto a barrier island in southern Florida. Prior to this event, this species did not inhabit the island, but with the ample vegetation on the island and a lack of predators, the displaced individuals were able to survive and reproduce. After several years, the population stabilized with approximately 150 individuals. The 150 individuals on the island is an example of the

Exponential growth

Which of the following statements is correct about the comparison between MDCs and LDCs?