Question 1

Which of the following best describes the difference between a fundamental niche and a realized niche?

Accepted Answer

A fundamental niche is defined by environmental factors, while a realized niche is restricted by interactions such as competition.

Question 2

Which pattern of dispersion is most likely to occur in a population where resources are patchily distributed and individuals benefit from being close to one another?

Accepted Answer

Clumped

Question 3

According to Phillips and MacMahon's study of desert shrubs, what is the primary reason young shrubs are initially clumped?

Accepted Answer

Seeds germinate at safe sites, are not dispersed far from parent areas, and asexual reproduction occurs.

Question 4

Which equation correctly calculates population density ($$D) $$given the number of individuals ($$N) $$and the area ($$A) $$they occupy?

Accepted Answer

$$D = \frac{N}{A}$$

Question 5

Why do large-scale distributions of organisms, such as bird populations across North America, tend to be clumped?

Accepted Answer

Because historical contingencies, habitat gradients, and clumped habitat variables influence where populations thrive.

Question 6

Which of the following is NOT one of the three factors Rabinowitz used to classify commonness and rarity?

Accepted Answer

Reproductive rate

Question 7

A population of bees is found to have a regular distribution pattern. Based on Hubbell and Johnson's study, what is the most likely explanation for this pattern?

Accepted Answer

The bees are aggressive, leading to avoidance and uniform spacing.

Question 8

Which statement best explains the relationship between organism size and population density?

Accepted Answer

Population density generally declines as organism size increases.

Question 9

Which of the following scenarios would most likely result in a random distribution of individuals?

Accepted Answer

Resources are evenly distributed and interactions between individuals are neutral.

Question 10

If a species has a restricted geographic range, narrow habitat tolerance, and small local population size, what can be inferred about its extinction risk?

Accepted Answer

It is at higher risk of extinction because it combines all three forms of rarity.

Question 11

Which of the following is a real-world example of a limiting factor affecting population distribution?

Accepted Answer

A population of plants in a desert where water availability restricts their growth.

Question 12

Which conservation strategy is most appropriate for a species identified as rare due to limited habitat tolerance?

Accepted Answer

Habitat restoration and preservation.

Question 13

Which of the following best describes the process by which desert shrub distributions change from clumped to regular as they grow?

Accepted Answer

Competition among growing plants increases mortality in clumps, resulting in regular spacing.

Question 14

Which equation would you use to estimate the abundance ($$N) of a $$population if you know the density ($$D) $$and the area ($$A$$)?

Accepted Answer

$$N = D 	imes A$$

Question 15

Why are 'island' organisms generally at higher risk of extinction?

Accepted Answer

They tend to combine restricted range, narrow habitat tolerance, and small population size.

Question 16

Which of the following is an example of a clumped dispersion pattern at a large scale?

Accepted Answer

Bird populations concentrated in 'hot spots' with high abundance.

Question 17

Which factor is LEAST likely to influence the geographic distribution limits of a species?

Accepted Answer

Random genetic drift in a stable environment

Question 18

A population of herbivorous mammals is found to have a density of $$0.5$$ individuals per $$km^2 in an $$area of $$200$$ $$km^2. $$What is the estimated abundance ($$N) of $$this population?

Accepted Answer

$$N = 0.5 	imes 200 = 100$$

Question 19

Which of the following best describes a population with a regular dispersion pattern?

Accepted Answer

Individuals are uniformly spaced due to negative interactions such as competition.

Population Distribution and Abundance (Population Ecology: Chapter 9)

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