PPT-Serengeti Wildebeest: Density-dependent population growth

Month Rainfall mm Dry s eason vegetation t ype l ong grass amp open woodland Wet s eason vegetation t ype short grass plains productivity nutrients Synchronized birth pulse . Case Study: . Serengeti Lion Population Study. Panthera. . leo. “They say that cats have nine lives, but they don’t say that about the Serengeti lion. Life is hard and precarious on this unforgiving landscape”. 7 billion and growing. How can humans cause population decline in other species?. “As dead as a dodo”. humans . Mauritius, . dogs. pigs. cats. rats. nests, . forests. Four ways humans can cause population decline are:. Agenda for . Monday Jan 30. th. . Populations notes. Population worksheet. Why study populations?. Learn how organisms change over time, problems in an environment, and relationships between . organisms. Density. Density describes the number of organisms in a defined area.. Can be found with the following formula:. D. p. = N / A (or D = N / S in Nelson). D. p. is density. N is number of organisms . 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. Density-dependent: . something that depends on the amount of organisms in a unit . area. . (5 examples to follow). So what in the world is a density-dependent limiting factor??. Crowded populations mean the individuals have to compete for food, water, space, sunlight, or anything else necessary for survival and reproduction. 3 characteristics of all populations. Density. The number of organisms of the same species per unit area (25 people per classroom). Dispersion. The pattern of population distribution. Ranges. Limited by biotic and abiotic factors. ?. A large, dense population or . a small, scattered population. A small, scattered population. Two . ways a population can decrease in size?. decreased birthrate and emigration. Suppose that a species of . Size. 2. Density. 3. Growth rate. 4. Survivorship. 5. Age structure. Each population has a density, a dispersion, and a reproductive strategy.. . Populations. Population density is. a measurement of the number of individuals living in a defined space.. Factors. Remember, primary productivity of an ecosystem can be reduced by limiting nutrients. Limiting . factors can . determine carry capacity. Density Dependent Factors. Density Independent Factors. An Interrupted Case Study. Speaking: . Tony Sinclair, University of British Columbia. Populations in Serengeti National Park. Factor. Bottom-up or top-down?. Density-dependent or independent?. Bottom-up. Most . populations . live together in clumps or patches.. Populations can grow, shrink, or remain stable. Population Dynamics. Age Structure. – proportions of individuals at various ages. Population Density. Course Objectives. Define the following ecological terms: Population, population density, community, population distribution, diversity, Limiting factors, resources, biotic potential (. r ), . carrying capacity . Nicole . Tunbridge. and. Kathleen Fitzpatrick. Turtle Tracks. Population ecology explores how biotic and abiotic factors influence density, distribution, size, and age structure of populations. For example, the number of loggerhead turtle hatchlings that survive their first journey to the ocean is affected by both biotic and abiotic factors.