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BIOL 4150 Lecture Notes - Genetic Drift, Inbreeding Depression

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ochreherring44
24 Feb 2012
School
University of Guelph
Department
Biology
Course
BIOL 4150
Professor
Andrew Mac Dougall

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Document Summary

Density dependence: density dependence: the birth or growth rate to decrease, as the density of the population increases. Is the tendency for the death rate in a population to increase, and/or: density independent: neither to rise nor fall as the density of the population increases. Is the tendency for the death, birth or growth rate in a population. 0 s h t a e d f o r e b m u. 0 i t y s h t a e d f o r e b m u. 0 h t a e d t n e c r e. 0 n s i t y: density-dependent changes in birth and death rates slow population increase, they represent an example of negative feedback, they can stabilize a population near carrying capacity. Stochastic population growth: stochastic influences, measures used are mostly averages (bx) or probabilities (sx, in reality, these will over- or under-perform.

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Related Questions

Question :Mutations that cause sickness and/or death after reproduction has occurred:

Question 1

options: can be passed on to future generations.

will not be passed on to future generations. are unlikely to occur.

are only passed on to future generations in species that have short life spans.

Question 2

In a population exhibiting logistic growth, what happens when the carrying capacity is exceeded?

Question 2 options:

The growth rate becomes zero until the population is back within the carrying capacity.

The growth rate becomes negative until the population is back within the carrying capacity.

The population crashes and becomes extinct.

The population's fertility drops to zero.

Question 3 How does exponential growth differ from logistic growth?

Question 3 options:

Logistic growth models take the population's age structure into account.

Long-term exponential growth is more commonly observed than long-term logistic growth in nature.

The logistic model of growth incorporates environmental limitations on population size.

Logistic growth generally comes with infinite expansion.

Question 4 Density-dependent and density-independent growth factors influence the size of a population by causing changes in the:

Question 4 options:

death rate and pattern of dispersion.

birth rate and death rate.

age structure and birth rate.

carrying capacity and age structure.

Question 5 The life history of an organism does not include the organism's

Question 5 options:

reproduction

All of these are included in an organism's life history.

death

birth

In a small population, if immigration is greater than emigrationand if the birth rate is higher then the death rate then

Select one:

a. the death rate will likely decrease and the birth rate willlikely increase.

b. the population will experience exponential growth.

c. if nothing changes then the population will eventually reachor exceed the carrying capacity of the environment.

d. the population has plenty of resources.

e. the number of predators will also increase.

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