Biology 2382B Lecture Notes - Lecture 17: Logistic Function, Exponential Growth, Northern Ontario

48 views3 pages
Human Population I
- Density 15 people/m2 based on total surface of Earth, 50 people/m2 based on land surface of Earth (but areas
vary from 0 people/m2 to more than 1000 people/m2)
Spatial Structure
- Human population is clumped at multiple scales...
- At the broadest scale, it is clumped due to availability of resources, culture, and history.
- Areas of lowest density = areas of harsh environment (not many resources, and environmental conditions are
much difficult cold, desert, thick forest, etc.).
- Zooming in at a smaller spatial scale, we see the estimate of population densities of Ontario. Even at this more
local scale, there is still a clumped distribution (largely driven by the environment much harsher in Northern
Ontario like the muskeg, and it is also driven by the fact that there are more resources in South Ontario like other
people, jobs, economies, etc.).
- Zooming in at a smaller spatial scale, this is the map of the population density of London. Even at this smaller
spatial scale, there is still clumping. Once we get w/in a city, there are fairly high population densities. Higher
population densities in the core (apartments, businesses, etc.), lower population densities in surrounding area. At
this scale, there are a number of different factors that are now driving population density more related to urban
planning, cultural factors, etc.
Dynamics
- First Paradox when it comes to human population (and not a othe speies’ populatio hat’s poal
been driving the increase in population in recent years is the decrease in the death rate, but if we want to limit the
growth of the population, we should focus on controlling the birth rate.
- Second paradox when it comes to the human population (and not any other species) In other organisms, if
there is a richer environment/better quality life, they would be able to survive better, have more offspring that
also survive and so there would be a positive relationship between wealth and growth rate. However, in human
population, the opposite is true. As people become more affluent and quality of life improves, they have fewer
offspring and so there is a negative relationship between wealth and growth rate.
- Third paradox In recent time, human population has changed (globally) by decrease in death rate, but if we
think about spatial variation in terms of what we see now, a lot of the variation in growth rate from one place to
another is also driven by differences in birth rate (which is affected by wealth). It is important to distinguish
between processes that occur historically and change over time and processes that lead to spatial variation that
we might see right now.
- The human population now is following exponential growth model (but some slight variation as the growth rate is
going down a little). Natural populatios a’t go epoetiall foee, the ill eetuall eah a liit. The,
they will either crash or approach a carrying capacity.
- In natural populations, we would expect to see a period of exponential growth followed by a period of decrease
in the growth rate of the population and eventually settling at a population size that approaches carrying capacity
logisti goth ue. As populatio appoahes aig apait, it epeiees eioetal esistae –
limiting factors in the environment that either increases rate of death or decreases rate of birth which decreases
total growth rate of the population and leading it to eventually reach an r of 0 and level out at that carrying
capacity.
find more resources at oneclass.com
find more resources at oneclass.com
Unlock document

This preview shows page 1 of the document.
Unlock all 3 pages and 3 million more documents.

Already have an account? Log in

Document Summary

Density 15 people/m2 based on total surface of earth, 50 people/m2 based on land surface of earth (but areas vary from 0 people/m2 to more than 1000 people/m2) Human population is clumped at multiple scales At the broadest scale, it is clumped due to availability of resources, culture, and history. Areas of lowest density = areas of harsh environment (not many resources, and environmental conditions are much difficult cold, desert, thick forest, etc. Zooming in at a smaller spatial scale, we see the estimate of population densities of ontario. Even at this more local scale, there is still a clumped distribution (largely driven by the environment much harsher in northern. Ontario like the muskeg, and it is also driven by the fact that there are more resources in south ontario like other people, jobs, economies, etc. Zooming in at a smaller spatial scale, this is the map of the population density of london.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents