Population (Lily) Activity-1
.docx
keyboard_arrow_up
School
Pennsylvania State University, Berks *
*We aren’t endorsed by this school
Course
419
Subject
Biology
Date
Dec 6, 2023
Type
docx
Pages
3
Uploaded by DoctorDolphinMaster130
Population Growth
Exercise 1: Exponential Growth of Populations
Which one of the graph lines in this graph does your
lily pad graph most resemble? Highlight or put a star
or somehow identify that graph line.
The graph you have constructed represents
exponential growth
. It is called a "
J-curve
".
Exponential growth occurs when there are no limits to
the size to which a population can grow. Food, water,
and living space are some of the resources individuals
need to live healthfully and to reproduce to their
maximum potential. When such resources are
unlimited, populations may undergo exponential
growth.
Some characteristics of exponential growth curves are slow initial growth and then a rapid, dramatic population
"explosion" after several generations.
There are several factors affecting the shape of the growth curve.
reproductive rate
(number of new organisms produced compared with number of deaths)
limits on resources: food, water, living space
4. Would there be a maximum number of lily pads that can grow in your pond (your table top)? Explain.
5. Resources and space are typically limited in ecosystems. Exponential growth generally occurs only when the
population is either a) very small relative to available resources or b) very aggressive in taking resources away from
other populations. What type of interaction would the latter (situation b) represent?
Exercise 2: Can populations grow forever?
1. Examine the graph shown below. What do you notice about the graph? How is it different from the graph of lily
pads you saw earlier?
2. What do you suppose could explain this type of
population growth?
As you may have predicted, there is a maximum number of lily pads that can grow in your pond. This is called the
carrying capacity
.
There are several factors which limit the carrying capacity of any environment. Some of them
are:
climate (temperature, etc)
food and water availability
salinity
sunlight
physical space
disease
predators
3. Which one of the above was the limiting factor in the lily population simulation? What about in a real life
situation?
The figure above shows what happens to a population when it reaches the carrying capacity of the surrounding
environment. This is called an "
S curve
"
because it is roughly shaped like an "S". Label the graph as an S curve
then identify the point in the growth where carrying capacity is reached.
4. What is the carrying capacity of the population recorded in the above figure (about how many organisms of this
species can be supported in this ecosystem)?
5. Take a look at the figure to the right. What do you
notice is occurring to the population? What happens at
point "A"? What happens at point "B"? What could
explain such a population growth pattern? How is it
different from the previous graph?
If there is a sudden change which affects the amount of available resources (for instance, a drought or a frost) a
population which is growing exponentially may experience a dramatic decrease in size. This is called a
population
crash
. Some populations experience cycles of exponential growth followed by crashes. This pattern is called
boom
and crash
and is illustrated in the above figure.
6. Sometimes a population drops to zero when it crashes. An example is the Hohokam tribe in central Arizona,
which lived there more than 2,000 years ago. Experts believe that the population was at one time over 1 million
people, but somehow the entire Hohokam culture vanished. Can you think about another population that we
learned about which had a similar fate? Explain.
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
Related Questions
Do the questions below the mosquito please
arrow_forward
Which of the following are true for a population that is increasing according to the exponential
growth equation? Choose all that are true.
per capita birth rate is always greater than per capita death rate
O r is constant
O ris greatest when the population is greatest
the population would continue to grow forever
the population grows as if resources are never limiting growth
doubling time is constant
arrow_forward
help ?
arrow_forward
1 Of the three models of population growth, which is the most accurate depiction of a population in a natural environment?
exponential model
linear model
boom-and-bust
logistic model
arrow_forward
A population of rabbits, when introduced to a new environment with abundant resources, would
most likely display what type of growth?
Logistic growth
Exponential growth
Negative growth
No growth
arrow_forward
Which growth model would you expect to see in a stable population?
Select one:
Exponential
Speculative
Factorial
Logistic
arrow_forward
Match each organism to the most likely life strategy and growth type
Organism
Life Strategy
K-Selected or r-Selected
Growth Pattern
Logistic or exponential
Beavers are monogamous mammals that breed annually and produce a litter of about one to four kits. Kits remain in the care of the colony until two to three years of age.
Century plants are flowering plants native to Mexico. Century plants live 10-30 years and flower only once in their lifetime and perish shortly after. THeir giant flowering stalks can reach up to 9m long but they reproduce primarily via suckers.
Honeybees live in colonies as large as 50,000 bees. Only the queen lays eggs and lays up to 2,000 per day.
The house mouse is a polygamous mammal with the gestation period of about 20 days and a litter size of up to 14. Mice nurse their young until about 20 days.
arrow_forward
Help
arrow_forward
Create/draw a graph that represents a population undergoing exponential growth. Properly label the x and y-axis of your graphs.
arrow_forward
Don't give AI generated solution
Give typing all answers with explanation
arrow_forward
The following equation is used to calculate the population growth rate, Ro, per generation from a life
table. Iy is survival probability from birth to age x and my is fecundity at age x.
Ro = Elkm
Multiplying ly and my and summing it over all age categories in the life table gives the population growth
rate per generation because:
Calculating the reproductive output for each age class requires considering the survival probability to
that age (a dead individual does not reproduce) and the fecundity at that age by multiplying them
with each other. Summing over reproductive output for all age classes gives the total per capita
growth rate of the population
The fecundity at each age is lower when the survival is higher because of energy constraints.
Multiplying probability of survival and fecundity in each age class takes this trade-off into account.
Summing over reproductive output for all age classes gives the total per capita growth rate of the
population
The resulting type of growth…
arrow_forward
Heparin is a blood-thinning drug (prevents coagulation). Heparin is broken down by
the liver, and has a half-life of 1.4 hours in the body.
What type of mathematical model is immediately implied by the term 'half-life'?
Exponential growth
Exponential decay
Logistic growth
Logistic decay
arrow_forward
False
False
False
True
500
drag and drop answer here
Here is a chart representing the human population growth on earth.
drag and drop answer here
1000
Year (A.D.)
Use the data in the chart to classify each statement as true or false.
drag and drop answer here
1500
drag and drop answer here
2000
ITEM BANK: Move to Top
According to the chart, human population
has always been rising.
In the year 1500, there were more than 2
billion people on earth.
Saying that, "the recent rise in population
is due to better farming" is an observation_
Saying that, the recent rise in population
is due to better medicine" is an inference.
Ecosystem Dynamic
HB 6A 2) Limiting Facto
arrow_forward
What are the challenges posed by population growth? Please explain why it happens and how it affects the population
arrow_forward
The per-capita birth rate of individuals in a population is 0.8, and the per-capita death rate of individuals in the same population is 0.6. Given these rates, what is happening to the size of the population?
constant
decreasing
increasing
nearing half of K
random
arrow_forward
Examine the characteristics of logistic growth by completing each statement. Not all choices will be used.
*1
S
exponential
four
competition
follicular
lag
two
J
stable equilibrium
Logistic growth results in a(n)
curve when graphed.
This growth curve exhibits
time.
The
phase exhibits a slow growth rate due to
the small number of individuals within the population early on.
Exponential growth slows as
increases during the deceleration phase.
As the population size grows, the growth rate will accelerate due
to biotic potential during what is called the
growth phase.
-shaped growth
distinct phases over
Finally, the carrying capacity is reached during the
< Prey
n
for resources
phase where birth and death rates are equal
arrow_forward
During 24 months, a population of 5,000 prairie dogs experienced 6 500 births and 5 560 deaths. Forty two prairie dogs left the population, and 85 prairie dogs joined the population. Calculate the growth of the prairie dog population during the 24 months. Calculate the per capita growth rate of the prairie dog population and the per capita growth rate per year. Show all work and explanation.
arrow_forward
Which set of values for the intrinsic rate of increase, finite rate of increase, and net
reproductive rate could describe the same growing population?
(Note: you should not need to do any math to figure this one out. Just think through general
interpretations of each parameter)
Or = -0.14, A = 0.87, RO = 0.5
r = 3.0, A = 0.22, RO = 0.5
r = 0.22, A = 1.25, RO = 3.0
%3!
r =
= 0.22, A = -0.14, RO = 0.5
arrow_forward
Give typing answer with explanation and conclusion
arrow_forward
identify and describe this type of population growth pattern.
I put fluctuation growth pattern as it matched up with what i have previously learned but just wanted to double check.
i know there is exponential growth, logistic growth, fluctuations and cycles when it comes to population dynamics
arrow_forward
What is true of a population with a logistic growth pattern?
Choose All That Apply
It has growing at a constant rate
It is at or close to its carrying capacity
Its K-N/K value does not change
It has an exponential growth phase
arrow_forward
Population growth model Notes
Population growth
Using discrete time steps, which is easier to describe that continuous change, the model for population growth is this:
N₁
Try changing the blue numbers, for "r" (rate) and "N0" (start population), below.
r:
No:
Nort
Moose: 1.5
House fly: 80
***
80 Time step (t) (N) Population at end of time step (N₁)
2
0
1
2
3
4
5
6
7
8
9
10
Wolf: 1.2
Z żż ź żż žžžžž ž
Cockroach: 40
2
N₁ 160
No
12800
1024000
81920000
6553600000
5.24288E+11
4.1943E+13
3.35544E+15
2.68435E+17
N10 2.14748E+19
N₂
N3
N4
N5
N6
Try these hypothetical "r" values to begin, then try new numbers of your own:
N7
N8
N9
Rabbit: 5
Endangered tiger: 0.8
arrow_forward
Exponential population growth occurs when N=K.
True
False
arrow_forward
If a population has a constant r = 0.3
Group of answer choices
the per capita rate of population increase continues to accelerate as the population grows
the time necessary for population size to double gets shorter as time goes by since population size is increasing exponentially
the absolute increase (change in population size per unit time) is also constant
the time necessary for population size to double is also constant
arrow_forward
1. A population of black-capped chickadees grows continuously with a constant per
capita growth rate. It took 2 years to grow from 400 individuals to the current population
of 3000 individuals. How long will it take to grow from 3000 to 12,000? Write your
answer in the box below. No credit will be given for your answers unless you show your
work. Place your final answer in the box below.
time to grow from 3000 to 12,000 =
arrow_forward
Demographic momentum is the population principle that states that;
Populations cannot exceed their carrying capacity
Youthful populations grow much faster than populations with many older people
The resources of the earth are finite and so no population can grow forever
We can increase production to account for the growing human population
arrow_forward
SEE MORE QUESTIONS
Recommended textbooks for you
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Related Questions
- Do the questions below the mosquito pleasearrow_forwardWhich of the following are true for a population that is increasing according to the exponential growth equation? Choose all that are true. per capita birth rate is always greater than per capita death rate O r is constant O ris greatest when the population is greatest the population would continue to grow forever the population grows as if resources are never limiting growth doubling time is constantarrow_forwardhelp ?arrow_forward
- 1 Of the three models of population growth, which is the most accurate depiction of a population in a natural environment? exponential model linear model boom-and-bust logistic modelarrow_forwardA population of rabbits, when introduced to a new environment with abundant resources, would most likely display what type of growth? Logistic growth Exponential growth Negative growth No growtharrow_forwardWhich growth model would you expect to see in a stable population? Select one: Exponential Speculative Factorial Logisticarrow_forward
- Match each organism to the most likely life strategy and growth type Organism Life Strategy K-Selected or r-Selected Growth Pattern Logistic or exponential Beavers are monogamous mammals that breed annually and produce a litter of about one to four kits. Kits remain in the care of the colony until two to three years of age. Century plants are flowering plants native to Mexico. Century plants live 10-30 years and flower only once in their lifetime and perish shortly after. THeir giant flowering stalks can reach up to 9m long but they reproduce primarily via suckers. Honeybees live in colonies as large as 50,000 bees. Only the queen lays eggs and lays up to 2,000 per day. The house mouse is a polygamous mammal with the gestation period of about 20 days and a litter size of up to 14. Mice nurse their young until about 20 days.arrow_forwardHelparrow_forwardCreate/draw a graph that represents a population undergoing exponential growth. Properly label the x and y-axis of your graphs.arrow_forward
- Don't give AI generated solution Give typing all answers with explanationarrow_forwardThe following equation is used to calculate the population growth rate, Ro, per generation from a life table. Iy is survival probability from birth to age x and my is fecundity at age x. Ro = Elkm Multiplying ly and my and summing it over all age categories in the life table gives the population growth rate per generation because: Calculating the reproductive output for each age class requires considering the survival probability to that age (a dead individual does not reproduce) and the fecundity at that age by multiplying them with each other. Summing over reproductive output for all age classes gives the total per capita growth rate of the population The fecundity at each age is lower when the survival is higher because of energy constraints. Multiplying probability of survival and fecundity in each age class takes this trade-off into account. Summing over reproductive output for all age classes gives the total per capita growth rate of the population The resulting type of growth…arrow_forwardHeparin is a blood-thinning drug (prevents coagulation). Heparin is broken down by the liver, and has a half-life of 1.4 hours in the body. What type of mathematical model is immediately implied by the term 'half-life'? Exponential growth Exponential decay Logistic growth Logistic decayarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Biology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage LearningBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax