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BIO220H1 Lecture 17: Lecture 17 Notes

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School
UTSG
Department
Biology
Course
BIO220H1
Professor
James Thomson

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BIO220H1 Full Course Notes
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BIO220H1 Full Course Notes
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Document Summary

Human impact is a function of population and consumption (affluence and technology: affluence the consumption that humans are imposing on natural systems, technology efficiency with which that affluence is gained. Dn/dt = rn; solved as nt = n0ert. The simplest model of density-dependent regulation is the logistic model: density-dependent growth rates are not constant but vary with the number of individuals in the population. Logistic growth sigmoid growth, asymptotic approach to carrying capacity (k) Slide 7: population starts with exponential growth but flattens out at k, the breaking term [(k-n)/k] shows how resources are being exhausted. The data from allee from before 1949 best fit the sigmoid curve. They reached the conclusion that the carrying capacity would be 2. 6 billion people. Best fit of logistic equation to data suggests levelling at 2. 6 billion. So far, human population growth looks more like exponential growth than logistic. The population didn"t fit the logistic model predicted by allee in the 1940s.

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Related Questions

The number of individuals in a given area, such as an acre or a square mile, is a measurement known as:
a. population size.
b. minimum viable population.
c. population distribution.
d. population density.
2. Individuals who live in social groups are usually found in a ________________ distribution.
a. patterned
b. clumped
c. uniform
d. random
3. Under what conditions might we see exponential population growth?
a. When the population is large and approaching carrying capacity
b. When there is a sudden influx of a new food source
c. When there are enough predators around to keep the population in check
d. When a population has exceeded carrying capacity
4. What kind of things might cause a population experiencing exponential growth to transition to logistic growth?
a. The loss of that population's main predator
b. The emergence of a new food source such as ripening fruit on a tree
c. More competition for food from other species in the area
d. All of these could spur the transition.
5. Which of the following is an example of a density-independent factor for population growth?
a. Fire
b. Predators
c. Competition for nesting sites
d. Food availability
The number of individuals in a given area, such as an acre or a square mile, is a measurement known as:
a. population size.
b. minimum viable population.
c. population distribution.
d. population density.
2. Individuals who live in social groups are usually found in a ________________ distribution.
a. patterned
b. clumped
c. uniform
d. random
3. Under what conditions might we see exponential population growth?
a. When the population is large and approaching carrying capacity
b. When there is a sudden influx of a new food source
c. When there are enough predators around to keep the population in check
d. When a population has exceeded carrying capacity
4. What kind of things might cause a population experiencing exponential growth to transition to logistic growth?
a. The loss of that population's main predator
b. The emergence of a new food source such as ripening fruit on a tree
c. More competition for food from other species in the area
d. All of these could spur the transition.
5. Which of the following is an example of a density-independent factor for population growth?
a. Fire
b. Predators
c. Competition for nesting sites
d. Food availability
The number of individuals in a given area, such as an acre or a square mile, is a measurement known as:
a. population size.
b. minimum viable population.
c. population distribution.
d. population density.
2. Individuals who live in social groups are usually found in a ________________ distribution.
a. patterned
b. clumped
c. uniform
d. random
3. Under what conditions might we see exponential population growth?
a. When the population is large and approaching carrying capacity
b. When there is a sudden influx of a new food source
c. When there are enough predators around to keep the population in check
d. When a population has exceeded carrying capacity
4. What kind of things might cause a population experiencing exponential growth to transition to logistic growth?
a. The loss of that population's main predator
b. The emergence of a new food source such as ripening fruit on a tree
c. More competition for food from other species in the area
d. All of these could spur the transition.
5. Which of the following is an example of a density-independent factor for population growth?
a. Fire
b. Predators
c. Competition for nesting sites
d. Food availability
The number of individuals in a given area, such as an acre or a square mile, is a measurement known as:
a. population size.
b. minimum viable population.
c. population distribution.
d. population density.
2. Individuals who live in social groups are usually found in a ________________ distribution.
a. patterned
b. clumped
c. uniform
d. random
3. Under what conditions might we see exponential population growth?
a. When the population is large and approaching carrying capacity
b. When there is a sudden influx of a new food source
c. When there are enough predators around to keep the population in check
d. When a population has exceeded carrying capacity
4. What kind of things might cause a population experiencing exponential growth to transition to logistic growth?
a. The loss of that population's main predator
b. The emergence of a new food source such as ripening fruit on a tree
c. More competition for food from other species in the area
d. All of these could spur the transition.
5. Which of the following is an example of a density-independent factor for population growth?
a. Fire
b. Predators
c. Competition for nesting sites
d. Food availability
The number of individuals in a given area, such as an acre or a square mile, is a measurement known as:
a. population size.
b. minimum viable population.
c. population distribution.
d. population density.
2. Individuals who live in social groups are usually found in a ________________ distribution.
a. patterned
b. clumped
c. uniform
d. random
3. Under what conditions might we see exponential population growth?
a. When the population is large and approaching carrying capacity
b. When there is a sudden influx of a new food source
c. When there are enough predators around to keep the population in check
d. When a population has exceeded carrying capacity
4. What kind of things might cause a population experiencing exponential growth to transition to logistic growth?
a. The loss of that population's main predator
b. The emergence of a new food source such as ripening fruit on a tree
c. More competition for food from other species in the area
d. All of these could spur the transition.
5. Which of the following is an example of a density-independent factor for population growth?
a. Fire
b. Predators
c. Competition for nesting sites
d. Food availability

Nairobi has a birth rate of 3.3 individuals per individual per year and a death rate of 3.2 individuals per individual per year.

a. What is r?

b. Is the population declining, growing, or remaining constant based on your answer for part a.

c. Assuming exponential growth, how many years are necessary for the population to double?

d. If the population is presently 49. What will be the population in 25 years?

e. If the carrying capacity were 105, what would the population be in 25 years?

Visit the websites titled, “Exponential Growth”(http://www.otherwise.com/population/exponent.html)and “Logistic Growth”. (http://www.otherwise.com/population/logistic.html) Run theapplet (for both websites) at birth rates of 1.2, 1.5 and 2. Makesure to view the graph results of all growth rates.

Describe the effects of birth rate on the exponential andlogistic growth curves.

Answer in100 words or less.