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BIOL 313 Lecture Notes - Lecture 13: Exponential Growth, No Age, Logistic Function

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rosefrog223
10 Feb 2018
School
University of Calgary
Department
Biology
Course
BIOL 313
Professor
Kyla Flanagan

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Document Summary

No i or e the population is closed; changes in population depend only on local births and deaths. Constant b and d if a population is going to grow with constant birth and death rates, an unlimited supply of space, food, and other resources is required. and d do not vary randomly in time. All individuals are the same no genetic structure, or if there is, the genetic structure must be the same through time. No age or size or sex structure no differences in b and d among individuals due to their age or body size or sex. Continuous growth with no time lags individuals are being born and dying continuously and the rate of increase change instantly as a function of the current population size. Density-independent growth is when the per capita birth and death rates are independent function of) of the (not a the density population.

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Related Questions

Compare and contrast the application of the exponential and logistic growth model to population growth.

Include examples and how each model may or may not address the assumptions listed below:

-A population is closed (growth only depends on births and deaths)

-Birth and death rates are constant

-All individuals are identical

-Reproduction is continuous (overlapping generations)

-Resources are totally unlimited

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

Populations (Ecology)

•What’s the difference between a cohort and static life table and what are the difficulties with each? Be able to interpret data in a life table.

• Be able to draw or interpret survivorship curves for different populations. What are the differences between the three types?

• Why does population age structure matter?

• What happened to Pablo Escobar’s hippos? What are some possible consequences? What might happen in the future?

• What are exponential and geometric growth?

• Be able to graph population size over time for a given growth rate (like figure 10.11).

• What’s the difference between density dependent and density independent factors to limit growth? Give examples. Which one regulates population size? Why?

• What is logistic growth? Explain how the growth rate changes at different population sizes. Be able to compare logistic and exponential growth.

• What are the four factors that affect population size over time?

• What are population cycles? What are some of the factors that drive them?

• What is delayed density dependence and why does delayed density dependence cause populations to fluctuate? What factors affect these fluctuations? Be able to draw typical population fluctuation figures like fig. 11.10.

• What’s the difference between stabilizing and destabilizing feedbacks? How do delayed feedbacks affect a stabilizing feedback?

• How does population size affect the likelihood of extinction?

• What is the Allee effect? How does it affect growth rate at different population densities? Draw a figure illustrating this.