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Population Growth

by: Carina Sauter

Population Growth Ecology 1000

Carina Sauter
GPA 3.79
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About this Document

These notes discuss the video we watched in class as well as Connelly's lecture on the increasing population of humans, and how this affects the world around us.
Introduction to Environmental Issues
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This 2 page Class Notes was uploaded by Carina Sauter on Thursday August 18, 2016. The Class Notes belongs to Ecology 1000 at University of Georgia taught by Connelly in Fall 2016. Since its upload, it has received 304 views. For similar materials see Introduction to Environmental Issues in Ecology at University of Georgia.

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Date Created: 08/18/16
Populations: Population Growth • October of 2011: the world reached 7 billion people and is still growing • David Attenborough video o Naturalists realize animals and plants are going extinct and began to research the factors leading to this and measures to take to avoid this o World Wildlife Fund § Raise awareness, money and knowledge § Now known as the Worldwide Fund for Nature § Animals brought to zoos to conserve § National Parks made § Eco-tourism: tourism directed toward exotic, often threatened, natural environments, especially to support conservation efforts and observe wildlife § As of 50 years ago, more than 20 countries had a wildlife conservation program o Why are there more problems than ever? § 50 years ago, there were approximately 3 billion people on earth – we now have more than 7 billion and need space and resources to support the growing population • animals and plants, the natural world, use to have the land to itself § these disasters are all connected to the growing population • food, water, energy, space • we can’t have more people than we can provide for § Solutions: • Government involvement • Women’s rights and education • Family planning § Even if we help to keep the human population and sustain its growth, we hurt other populations – plants, animals, etc. • Population growth = 10,000 per hour o Population is growing o Life expectancy is increases o Death rates decreasing • Darwin o “There is no exception to the rule that every organic being naturally increases at so high a rate, that, if not destroyed, the earth would soon be covered by the progeny of a single pair § No matter what organism you are, you will cover the earth unless not destroyed • Decrease birth rates OR • Increase death • Introduction of European Starlings into NYC Central Park 1890 o Moved organisms around the country to make it more homogenous § Exponential growth because the birth rate > death rate § If it weren’t for death rate, a population of 60 birds could turn into 78,782 thousand in 6 years • Population determinants: o Birth, Death, Immigration, Emigration o Changes in a population = N o ∆N = B + I – D – E : change in population equals… • Because organisms have different life histories, there is a need for two general models of population growth o Exponential (logistic) growth: used for populations with continuous reproduction and/or overlapping generations § Ex. bacteria, humans, animals, etc. o Geometric growth: used for populations with production occurring at discrete intervals § Ex. birds • Rate of change in population o dN/dt = the change in population size through time o r = the growth rate, which is the difference between births and deaths o N is the population size • Why does the model not work? o Because we can’t incrase infinitely § Finite planet § Must slow down • What does this suggest? o Population growth is very rapid (exponential) and independent of density o But as more and more of the resources are taken up and become unavailable, the growth rate slows down and eventually becomes zero when all resources are used up • Are Birth rates and Death rates (r) consistent throughout the world? o Higher birth rates in less wealthy areas § Higher birth rates among younger women shortens generation time leading to more children growing and reproducing leading to higher population growth rates § Why are there more births in poorer areas? • Need kids to help them with work (farming countries) • Low access to birth control • Culture/religious affiliation • Low education/literacy • Always trying to have boys (culture) o Replacement = 2 (mom and dad) § BUT this does not factor in immigration


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