PPT-Population Growth Curves

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. Chapter Overview Questions. What are the major characteristics of populations?. How do populations respond to changes in environmental conditions?. How do species differ in their reproductive patterns?. 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. How can the human population continue to grow exponentially unlike other populations of organisms? Can this continue . indefinitely? . Objectives. Observe trends in human pop. growth. Identify controls that influence pop. growth. 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). Overpopulation: Proponents and Critics . Malthus Basics. Idea: late 1700’s. During this time (before the industrial revolution) he predicted that the growing population would eclipse the available food supply. . 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 . 3.. A . population. is a group of individuals of the same species living in an . area. Distribution Patterns. Uniform . distribution . results from intense competition or antagonism between individuals. 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. and Population Control. Chapter 5 (Miller and . Spoolman. , 2010). Figure 5.1. An endangered southern sea otter in Monterey Bay, California (USA), uses a stone to crack the shell of a clam (insert). It lives in a giant kelp bed near San Clemente Island, California (background). Scientific studies indicate that the otters act as a keystone species in a kelp forest system by helping to control the populations of sea urchins and other kelp-eating species.. 0. 25. 1000. 100. Human. (type I). Hydra. (type II). Oyster. (type III). 10. 1. 50. Percent of maximum life span. 100. 75. Survival per thousand. I. High death rate in post-reproductive years. II. Constant mortality rate throughout life span. Course Objectives. Define the following ecological terms: Population, population density, community, population distribution, diversity, Limiting factors, resources, biotic potential (. r ), . carrying capacity .