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UGA - ECOL 1000 - Class Notes - Week 3

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UGA - ECOL 1000 - Class Notes - Week 3

School: University of Georgia
Department: Ecology
Course: Introduction to Environmental Issues
Professor: Connelly
Term: Fall 2016
Tags:
Name: Population Growth and Ecosystem Services
Description: These notes continue the discussion on population growth and begin the next lecture on ecosystem services, explaining many graphs and images extremely applicable to our recent history in ecology.
Uploaded: 08/22/2016
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background image Population Growth continued •  Comparing Birth Rates by Age o  Higher birth rates among younger women shortens generation time, leading to more children growing and reproducing, leaving to higher population growth rates o  Wealthier women tend to have less children later in life •  Age Structure o  If we know something about age-specific survival and fecundity, we can project population size and age structure into the future o  What is the American bulge from? à baby boomers §   Why are we concerned? à social security, we have to take care of them when they’re older, but we need money to support the huge population o  Age structure can apply to humans, animals, plants, etc. §   “walking dead”: if we have 100 rhinos, it is a very miniscule population §   important to know how many are left, how old they are, and the genders •  Life Tables o  Summarize age-specific schedules of survival and fecundity (typically for females) in a convenient format, including: §   Age §   Number alive §   Probability of survival between §   Mortality rate §   Fecundity (reproductive output) o  Cohort: a group of individuals of the same age-class
o  Although it may seem easy to make life tables for populations, there are millions
and millions of species to do them for o  Find out what is responsible for hurting populations and the probability of survival
background image •  Exponential Model of Growth o  dN/dt = rN §   because population growth is finite, this is only helpful to a certain point §   initially, it gives us a good picture o  Assumptions: §   Essential resources are unlimited •  Space
•  Food
§   Environment is constant •  No seasonal or annual variation o  To reflect the fact that populations must be controlled, we create K §   Carrying capacity: the number of individuals that the environment can support indefinitely •  K can and does change with new technology, or lowering our standard of living… •  Logistic Model of Population Growth o  dN/dt = rN (1- N/K) §   the second component reduced population growth as population size approaches carrying capacity o  Example: §   K = 10,000 and N = 10 à populations will grow quickly §   K = 10,000 and N = 10,000 à population would not increase quickly, and theoretically would stop all together because dN/dt = 0 o  If N is small (~0) , 1-0 = 1, term cancels out and you have maximum exponential growth (rN) o  As N approaches K, rN is multiplied by a very small number so population growth rate (dN/dt) slows WAY down

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School: University of Georgia
Department: Ecology
Course: Introduction to Environmental Issues
Professor: Connelly
Term: Fall 2016
Tags:
Name: Population Growth and Ecosystem Services
Description: These notes continue the discussion on population growth and begin the next lecture on ecosystem services, explaining many graphs and images extremely applicable to our recent history in ecology.
Uploaded: 08/22/2016
5 Pages 53 Views 42 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
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