Ecology 2000 Notes
Ecology 2000 Notes ECOL1000
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This 4 page Class Notes was uploaded by Savannah Peat on Thursday February 18, 2016. The Class Notes belongs to ECOL1000 at University of Georgia taught by Dr. J Vaun McArthur in Spring 2016. Since its upload, it has received 12 views. For similar materials see Environmental Issues in Business at University of Georgia.
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Date Created: 02/18/16
2/16/16 Exponential Growth is Unsustainable Von Foerster Human Population Model o Best model to describe human growth o Factors in declining death o Based on experimental equation o Did not factor in ZPG Movement Ex: China’s one child movement o Predicted population size is 10% within real number What’s the problem with population growth? 7.4 billion humans rapid population growth, which increases impact on environment rate of consumption is growing rapidly History of growth Preagricultural period: o 100,000 years ago o had culture and migrations o took 10,000 years to double population, resulting in 510 million total world pop. Agricultural period: o 10,000 years ago o had plant and animal domestication o took 1,000 years to double population, resulting in 500+ million total world pop. Industrial period: o Sanitation, medicine, fossil fuels Current period: o 7 billion Global Variation in Population growth cultures follow demographic transition, stages in population changes o Latin America is a prime example of demographic transition Influenced by birth rates o Birth rates are influenced wealth (more wealth, lower birth rates), age (age specific birth rates; ages in moms) Influenced by death rates o Death rates are influenced by wealth (wealth leads to increased nutrition and health care) and increased infant mortality rate Survivorship number of years members of a specific group lives, affected by wealth and sex Life expectancy number of years expected to live; affected by wealth and sex, girls live longer Influenced by age structure o Determined by survivorship and birth rates o Shown through pyramids Population Concepts 1 . Population momentum concept 1 o “r” is strongly influenced by people in prereproductive age class o population with most people in prereproductive age class will still continue to go 2. Population momentum concept 2 o “r” is strongly influenced by people in first reproductive class o population with most people in first reproductive class will grow faster Population Scenarios r=increase of 1.13% per year optimistic rate: 9 billion by 2050 Resource Use and Population Sustainability sustainability vs. carrying capacity reach carrying capacity= no growth 3 E’s of Environmental Issues 1. Ecology 2. Economics 3. Ethics Manage Population Family planning (manage birth rate) Some countries growing too fast (China, India) China has the 1 Child Policy, children are often abandoned, especially girls o Women often go missing here, leading to feminist movement Others too slow (Italy, Spain) Population control raises ethical and human issues China has relaxed 1 child policy 2/18/16 Some attributes of “R” and “K” selected species Environmental conditions: R: unstable, K: stable Population si R: below K, K: constant, near K Selection Favor R: high “R”, early reproduction, K: low “R”, delayed reproduction Length of life R: Short K: Long We should be where K is, but we’re not “r” species will have their “k” set back by four factors o Disease o Famine o War o Pestilence GA is 16 fastest growing state In GA and south, there is severe forest loss due to suburbia Components of Change Immigration, birth rate; Ex: Darien Project Georgia Atlas Population is affected by: o Education (adults without high school degree) o Social indicators (Medicaid, food stamps, financial aid) Several Population and Demographic factors suggests there are two GA’s Much of this is because of pregnancy, immigration Education opportunities are causative factors of birth rates This “2 GA’s” can be explained through “r” and “k” Population control is also linked to women’s rights (lack of growth occurs where there are more women, meaning they don’t reach ZPG) Disease Classification: Hard to transmit Easy to transmit Fast to kill Ebola and Meningitis Cholera Slow to kill AIDS Zika Ebola has shown to include the natural world o Explores connection between unrelated pieces of info like MEAT Ex: Busmeat video Pieces of puzzle o 1. Cutting rainforest new contact with wildlife o 2. Wildlife diseases infected animals poaching Eventual transfer to World Health Organizationhumans Diseases come from tropics Disease cannot be quarantined Created a 4 step plan o 1. Invest in public awareness o 2. Invest in public infrastructure o 3. Medical research o 4. Protect tropical habitats