Q: Given the following data for a beaver population: Births ($$B) = 50$$, Deaths ($$D) = 25$$, Time ($$T) = 5 $$years, Initial population ($$N) = 125. $$What is the population size after 5 years, assuming no immigration or emigration?

$$N_{final} = N + (B - D) \times T = 125 + (50 - 25) \times 5 = 250$$

Q: In a population of deer, 12 individuals die between ages 3 and 4 out of 776 remaining from the original 1000. What is the mortality rate per 1000 individuals?

$$\text{Mortality rate} = \frac{12}{776} \times 1000 \approx 15$$

Q: A population of bass fish in a lake is estimated using mark and recapture. If 100 fish are marked and released, and in a second sample of 200 fish, 20 are found to be marked, what is the estimated population size?

$$N = \frac{\text{number marked} \times \text{total second sample}}{\text{number recaptured marked}} = \frac{100 \times 200}{20} = 1000$$

Question 1

Given the following data for a beaver population: Births ($$B) = 50$$, Deaths ($$D) = 25$$, Time ($$T) = 5 $$years, Initial population ($$N) = 125. $$What is the population size after 5 years, assuming no immigration or emigration?

Accepted Answer

$$N_{final} = N + (B - D) 	imes T = 125 + (50 - 25) 	imes 5 = 250$$

Question 2

Which dispersion pattern is most likely observed in a population of bedbugs living in a mattress, as shown in the provided image?

Accepted Answer

Clumped

Question 3

A tornado devastates a prairie, killing many organisms regardless of their population size. What type of limiting factor is this?

Accepted Answer

Density-independent factor

Question 4

Which method would be most appropriate for estimating the population size of dandelions in a field?

Accepted Answer

Random sampling using quadrats

Question 5

In a population of deer, 12 individuals die between ages 3 and 4 out of 776 remaining from the original 1000. What is the mortality rate per 1000 individuals?

Accepted Answer

$$	ext{Mortality rate} = \frac{12}{776} 	imes 1000 \approx 15$$

Question 6

Which survivorship curve is most likely for a population of kangaroos, given their life history traits?

Accepted Answer

Type I (late loss)

Question 7

What happens to the carrying capacity of a fox population if the number of available rabbits decreases due to overhunting?

Accepted Answer

The carrying capacity decreases

Question 8

Which population growth model is characterized by a J-shaped curve and occurs under ideal conditions with unlimited resources?

Accepted Answer

Exponential growth

Question 9

If a population exceeds its carrying capacity, what is the most likely outcome?

Accepted Answer

Population size will decrease due to resource limitations

Question 10

Which of the following is a density-dependent limiting factor?

Accepted Answer

Disease

Question 11

In a predator-prey relationship, what typically happens to the predator population as the prey population increases?

Accepted Answer

The predator population increases

Question 12

Which method would be most appropriate for estimating the population size of zebras in a savanna?

Accepted Answer

Mark and recapture

Question 13

Which life history strategy is characterized by organisms living in stable environments, caring for their young, and having long life spans?

Accepted Answer

K-selected species

Question 14

A population of bass fish in a lake is estimated using mark and recapture. If 100 fish are marked and released, and in a second sample of 200 fish, 20 are found to be marked, what is the estimated population size?

Accepted Answer

$$N = \frac{	ext{number marked} 	imes 	ext{total second sample}}{	ext{number recaptured marked}} = \frac{100 	imes 200}{20} = 1000$$

Question 15

Which age structure diagram would indicate a rapidly growing population?

Accepted Answer

A pyramid-shaped diagram with a wide base

Question 16

In Springfield, 245 babies are born in 2019 and 115 people died. What type of growth rate did the city experience?

Accepted Answer

Positive growth rate

Question 17

Which of the following best describes the population growth of humans over the past 1000 years?

Accepted Answer

Exponential growth

Question 18

What is the main difference between interspecific and intraspecific competition?

Accepted Answer

Interspecific occurs between different species; intraspecific occurs within the same species

Question 19

Which population measurement technique is best suited for tracking dolphins in the ocean?

Accepted Answer

Tagging and mark-recapture

Question 20

If a population is experiencing zero population growth, what does this mean?

Accepted Answer

Birth rate equals death rate

Population Ecology: Principles, Patterns, and Human Impact

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