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Population Dynamics SC.912.L.17.5 Analyze how population size is determined by births, deaths, immigration, emigration, and limiting factors (biotic and abiotic) that determine carrying capacity. Source: http://www.stephsnature.com What do I need to know? how population size is determined by births, deaths, immigration, emigration and limiting factors use data about population dynamics, abiotic factors, and biotic factors to explain a change in carrying capacity and population size in an ecosystem that different types of organisms exist within aquatic systems due to chemistry, geography, light, depth, salinity, and/or temperature the potential changes in an ecosystem resulting from seasonal variations, climate changes and/or succession the positive or negative consequences that result from a reduction in biodiversity Population Size the size of a population is always changing four factors affect size immigration births emigration deaths Population Growth: Based on Available Resources Exponential Growth rapid population increase due to an abundance of resources Logistic Growth population facing limited resources Abiotic vs. Biotic non-living living Limiting Factors Video Guiding Questions: 1. Explain the biological carrying capacity? 2. What variables (limiting factors) affect the carrying capacity of a population? 3. How can biologists manage a population such as sturgeon? Video: https://www.youtube.com/watch?v=QI2ixJeIxEU Carrying Capacity the maximum number of individuals in a population that the environment can support Aquatic Systems factors affecting organism distribution geography light depth salinity temperature Source: http://sky.scnu.edu.cn/life/class/ecology/chapter/Chapter3.htm Ecological Relationships Competition, Predation & Symbiosis Video Guiding Questions: 1. Define competition, predation and symbiosis. 2. Explain the ecological niche (role) of organisms. Video: http://www.youtube.com/watch?v=D1aRSeTmQE&feature=player_detailpage Changes in Ecosystems Succession Changes in Ecosystems Climate Change Source: http://www.intechopen.com Loss of Biodiversity Video Guiding Questions: 1. Define biodiversity. 2. Describe the web of life. 3. How do human activities cause a loss of biodiversity? Video: http://www.youtube.com/watch?feature=player_detailpage&v=BXXczLhzlHA Show What You Know The number of pythons found throughout Everglades National Park has increased in recent years. These huge snakes are not native to Florida and are believed to have been released into the wild by pet owners. Wildlife biologists have initiated attempts to capture and remove these pythons. Which statement best explains the biologists’ reason for removing these pythons from the Everglades? A. The pythons could upset the territorial boundaries of native organisms. B. The pythons could adapt to overcome diseases common to native snakes. C. The pythons could prey on native organisms and cause native populations to decline. D. The pythons could begin to interbreed with native snakes and produce a more successful species. Show What You Know The graph below shows a population of pigeons living in a neighborhood over a ten-year period. Which of the following statements account for the change in population seen between years 7 and 8? A. The birth rate of the pigeons increased. B. The emigration rate of the pigeons decreased. C. The death rate of the pigeons exceeded the birth rate. D. The neighborhood reached its carrying capacity for the pigeon population Show What You Know A new species of snake was introduced to a tropical region. Scientists then noticed a steady decline in the presence of field mice and an increase in the number of snakes. Which of these is the most likely explanation about why the population size of each animal changed? A. The snakes introduced to the region dominated the habitat, forcing the mice to find another place to live. B. The mice became prey to the introduced snakes, allowing the snake population to increase but decreasing the mice population. C. The snakes introduced to the region competed with the mice for food, allowing the snake population to increase but decreasing the mice population. D. The people in the surrounding area set traps that killed the mice, allowing the snakes to live without any predators and therefore to increase in number. Show What You Know The highest concentration of life exists in the top 200 meters of ocean water. What is the most important factor that influences the concentration of life? A. amount of gases at the surface B. amount of nutrients in the water C. large number of predators at lower depths D. amount of sunlight Show What You Know Rabbits introduced into Australia over 100 years ago have become a serious pest to farmers. Rabbit populations increases so much that they displaced many native species of plant eaters. What is the most logical explanation for their increased numbers? A. Rabbits have a high death rate. B. There are few effective predators. C. Additional rabbit species have been introduced. D. There is an increase in rabbit competitors. Show What You Know Scientists found, that over a period of 200 years, a mountain pond was transformed into a meadow. During that time, several communities of organisms were replaced by different communities. Which of these best explains why new communities were able to replace older communities? A. The original species became extinct. B. Species in the older community died from old age. C. The abiotic characteristics of the habitat changed. D. Diseases that killed the older organisms disappeared.