BS276 Lecture Notes - Growth Factor, Limiting Factor, Paramecium
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9 Dec 2022
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Size (n): total # of individuals in a given area at a given time. High density = higher competition, possibility for disease outbreak, possibility of depleting food source. Distribution: how individuals in a population are spaced out compared to each other. Die-off or bottleneck effect can lead to skewed sex ratio (not enough females) limiting population growth. Density-dependent factors: factors that influence population growth based on size. Ex. food, competition for habitat, water, light, even disease. All of these things limit population growth based on their size; aka - small populations don"t experience these, large populations do. Density-independent factors: factors that influence population growth independent of their size. Ex. natural disasters (flood, hurricane, tornado, fire) It doesn"t matter how big or small a population is, natural disasters limit them both. Food is a density-dependent factor (also a limiting resource) When twice as much food was added to the dish, both species (paramecium) increased carrying capacity by about 2x.
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The number of individuals in a given area, such as an acre or a square mile, is a measurement known as: | |||||||||
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2. | Individuals who live in social groups are usually found in a ________________ distribution. | ||||||||
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3. | Under what conditions might we see exponential population growth? | ||||||||
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4. | What kind of things might cause a population experiencing exponential growth to transition to logistic growth? | ||||||||
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5. | Which of the following is an example of a density-independent factor for population growth? | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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What characteristic(s) should a sample have to be representative of the population?
Carefully selected to possess all the phenotypes in question |
Randomly selected |
At least 50% of the total population size |
Large enough to include every individual in the population |