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Test 101 Week One Notes

by: Kayla Wilken

Test 101 Week One Notes Test 101

Kayla Wilken
Minnesota State University Moorhead

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Kayla Wilken
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This 2 page Class Notes was uploaded by Kayla Wilken on Tuesday October 4, 2016. The Class Notes belongs to Test 101 at Minnesota State University Moorhead taught by Kayla Wilken in Fall 2016. Since its upload, it has received 4 views.

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Date Created: 10/04/16
Kayla Wilken September 21, 2016 Reading Response #5 Chapter 19, Pages 408-411 Population Growth Density-Dependent factors: Limiting factors whose intensity is Exponential Logistic related to population density. Population Growth: • Intraspecific competition: Population Growth: Competition between Expansion of organisms of the same species for the same resources. population in an ideal, • Division of food supply between Growth rate unlimited environment. more animals, birth rates decreases as the population size In a model, the decline as there is less energy approaches carrying population size of each available for reproduction. capacity (Max new generation is • Increasing death rates from population size calculated by crowded conditions. • Predation (predators environment can multiplying the current concentrates of capturing prey sustain). population size by a constant factor that which is in abundance). Limiting factors represents the number • Limited resources. restrict population of deaths subtracted by growth. the number of births. Density-Independent factors: Generally, on a graph, a Limiting factor whose intensity is unrelated to population density. Reasonings for J-shaped curve is Rapid decline. carrying capacity: produced. Only so much space • Seasonal changes in the suitable for Example: Each months, weather. breeding, food there are more rabbit • Environmental disturbances sources, and births than deaths; as a such as fire, floods, storms. predators. • Population cycles: Booms and result, the population busts. Undergo dramatic size increases each fluctuations in density with On a graph, an S- month. shaped curve is regularity. produced. As in How? •Not certain why. Many exponential growth, Disturbances such as hypothesis: the line continues, fires and floods may • Winter food shortages but for logistic from overgrazing. reduce the size of a • Predator-prey growth, we see the population; some line level off and organisms are able to interactions. stop growing take advantage of the • Combination of food upwards. lack of competition and resource limitation and quickly recolonize. excessive predation. •Long term studies are key to unravel causes. Exponential growth cannot be sustained indefinitely. Regulation: Each green arrow explains the difference between the types of population growth and the blue arrow discusses ways to regulate population grown.


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