Lecture 22

Lecture 22 - Exam 3 Stats Average: ~78 Lecture 22: How do...

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Exam 3 Stats Average: ~78
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Lecture 22: How do populations change over time? BIOL 1104 Dr. Paula Lemons
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Learning Objectives Make predictions about the life history parameters of organisms, given a set of population growth data about that organism. Recognize the exponential growth model and the logistic growth model. Name and describe the variables in each model and how they lead to different growth curves. Cite examples of exponential and logistic growth in nature. Describe the human population growth patterns historically as well as the different projections for human growth patterns the issues and questions surrounding human population growth, including the concept of ecological footprint. Explain what an ecological footprint is.
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“The Game of Life” (from the perspective of biology) All living things play the game. The object of the game: Compete for limited resources to grow, survive, and reproduce. The winners: Those who put more offspring into the next generation.
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Population Ecology Population = a group of individuals from the same species that live in the same area at the same time Asks: How and why do the number of individuals in a population change over time?
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UK http://www.rothamsted.ac.uk/Research/ParkGrassGa Began in 1856 1/3 acre plots established in a hay meadow. Meadow had uniform soil characteristics and vegetation. Since then some plots treated with fertilizer and some have been left untreated. Every year researchers record which plant species are present in each plot. Weather in all plots the same. Assumed that all plots exposed to same predators and disease. Dramatic changes in population sizes have taken place. 43 species tracked. 4 patterns of population change were observed.
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Lecture 22 - Exam 3 Stats Average: ~78 Lecture 22: How do...

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