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Biology

Robert J. Brooker

Chapter 56

Population Ecology - all with Video Answers

Educators


Chapter Questions

00:33

Problem 1

A student decides to use the mark-recapture technique to estimate the population size of mosquitofish in a small pond near his home. In the first catch, he marked 45 individuals. Two weeks later, he captured 62 individuals, of which 8 were marked. What is the estimated size of the population based on these data?
a. 134
b. 349
c. 558
d. 1,016
e. 22,320

Questions 2–4 refer to the following life table:

$$\begin{array}{llllll}\text { Age } & n_{x} & d_{x} & l_{x} & m_{x} & l_{x} m_{x} \\ 0 & 100 & 35 & 1.00 & 0 & 0 \\ 1 & 65 & ? & 0.65 & 0 & 0 \\ 2 & 45 & 15 & ? & 3 & 1.35 \\ 3 & 30 & 20 & 0.30 & 1 & ? \\ 4 & 10 & 10 & 0.10 & 1 & 0.10 \\ 5 & 0 & 0 & 0.00 & 1 & 0.0\end{array}$$

Morgan Thompson
Morgan Thompson
Numerade Educator
00:15

Problem 2

How many individuals in this population die between their first and second birthday?
a. 65
b. 45
c. 35
d. 25
e. 20

Morgan Thompson
Morgan Thompson
Numerade Educator
00:17

Problem 3

What proportion of newborns survive to age 2?
a. 0.55
b. 0.45
c. 0.35
d. 0.20
e. 0.15

Morgan Thompson
Morgan Thompson
Numerade Educator
01:23

Problem 4

What is the net reproductive rate?
a. 5
b. 2.5
c. 1.75
d. 1.45
e. 0.80

Christina Sorrentino
Christina Sorrentino
Numerade Educator
00:15

Problem 5

_____ survivorship curves are usually associated with organisms that have high mortality rates in the early stages of life.
a. Type I
b. Type II
c. Type III
d. Types I and II
e. Types II and III

Morgan Thompson
Morgan Thompson
Numerade Educator
00:19

Problem 6

If $\Sigma l_{x} m_{x}$ is equal to $0.5,$ what prediction can we make about the population?
a. This population is essentially not changing in numbers.
b. This population is in decline.
c. This population is growing.
d. This population is in equilibrium.
e. None of the above is correct.

Morgan Thompson
Morgan Thompson
Numerade Educator
01:04

Problem 7

Under what condition(s) will a population grow?
a. $\quad R_{0}=0.5$
b. $r=0.4$
c. $\quad \lambda=0.8$
d. conditions a and b
e. conditions b and c

Christina Sorrentino
Christina Sorrentino
Numerade Educator
06:00

Problem 8

The maximum number of individuals a certain area can sustain is known as the
a. intrinsic rate of growth.
b. resource limit.
c. carrying capacity
d. logistic equation.
e. equilibrium size.

Holly Brooks
Holly Brooks
Numerade Educator
01:25

Problem 9

Which pattern occurs when a population exhibits a constant per capita growth rate?
a. A
b. B
c. C
d. D
e. none of the above

Christina Sorrentino
Christina Sorrentino
Numerade Educator
01:11

Problem 10

Which pattern is observed when a population is heading toward extinction?
a. A
b. B
c. C
d. D
e. none of the above

Christina Sorrentino
Christina Sorrentino
Numerade Educator