PPT-Population and Growth

Overpopulation Proponents and Critics Malthus Basics Idea late 1700s During this time before the industrial revolution he predicted that the growing population would eclipse the available food supply . Image from Wikimedia Commons. Global human population. United Nations . projections (2004) . (. red. , . orange. , . green. ). . U. S. Census Bureau modern (. blue. ) . & historical . (. black. ) . Photo of introduced (exotic) rabbits at “plague proportions” in Australia from Wikimedia Commons.. Life Cycle Diagram. 0. 1. 2. 3. 0.3. 0.8. 0. 2. 4. seed. 1 to 2 . yr. old . adult. 2. to 3 . yr. Image from Wikimedia Commons. Global human population. United Nations . projections (2004) . (. red. , . orange. , . green. ). . U. S. Census Bureau modern (. blue. ) . & historical . (. black. ) . Factors Affecting Population Growth. Populations grow and shrink in response to abiotic and biotic factors.. Abiotic. – physical & chemical factors such as water & light availability, soil structure, salinity, pH, etc.. Graphs & Histograms. When conditions are . ideal. for growth and reproduction, a population will experience a rapid . increase. in size. . Initially the population grows . slowly. , but the larger the population gets, the faster it grows. As more offspring survive and reproduce, even more offspring are born.. Chapter 2 Key Issue 3. Earth. ’. s Population History. 1 billion reached circa 1830. 2 billion reached 1930 (100 years later). 3 billion reached 1959 (29 years later). 4 billion reached 1974 (15 years later). What is population?. Group of individuals of the same species that live in the same area. Does population change?. Sea otters, kelp, and sea urchins. Kelp forests offer a habitat for sea otters. Sea urchins feed on kelp. Arc of the course. Intro. Biodiversity is important for ecosystem function. Many causes for the loss of biodiversity. Module 1 – population growth. Module 2 – habitat loss and protection. Module 3 - climate . and Mechanisms. Species and Population. Organism. Species. : genetically similar organisms that reproduce. Population. : all members of . a. species in an area. Characteristics of populations:. Same species living in same area. 2) What are some things he mentions that can slow human population growth?. 3) How does increasing child survivability decrease population growth?. A . city experiences 12 deaths for each thousand people. What is the death rate (as a percentage and per thousand. 5-1: How Populations Grow. What is a population?. . Group of individuals of the same species in a given area.. 5-1: How Populations Grow. Characteristics of Populations:. Geographic Distribution (Range). Exponential Growth. (J-shaped curve). Logistic Growth. (S-shaped curve). Population ecology. Population ecology is the study of populations.. Population . = group of individuals of the same species occupying a common geographical area. An interbreeding group of the . same species. living in the same general area. may be distinguished by natural or . . arbitrary boundaries. Population Density vs Dispersion. the number of individuals per unit area or volume. Introduction to linking demography, population growth and extinction due to climate warming. What is Population Ecology? . Goal is to understand . factors. and . processes. that govern . abundance.