Day 19 chapter 14 november 18th
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Transcript of Day 19 chapter 14 november 18th
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Day 19 Chapter 14 November 18th
Dr. Amy B Hollingsworth
The University of Akron
Fall 2014
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• Exam scores were released. Overall, they were WAY better than exam two, so YAY!
• 65 questions, I threw out 9, total out of 56 questions.
• Final Exam – Chapters 14, 15, 16 in CBT during finals day -
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Chapter 14: Population Ecology
Planet at capacity: patterns of population growthLectures by Mark Manteuffel, St. Louis Community College
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14.1–14.6
Population
ecology is the
study of how
populations
interact with their
environments.
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14.1 What is ecology?
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14.2 A population perspective is necessary in ecology.
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14.3 Populations can grow quickly for a while, but not forever.
There is no exception to the rule that every organic being naturally increases at so high a rate that, if not destroyed, the Earth would soon be covered by the progeny of a single
pair.
—Charles Darwin, The Origin of Species
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In stable populations,
How many of the five million eggs that a female cod might lay over the course of her life will, on average, survive and grow to adulthood?
Who leaves more surviving offspring, a pair of elephants or a pair of rabbits?
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14.4 A population’s growth is limited by its environment.
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Density-dependent Factors
The limitations on a population’s growth that are a consequence of population density
This ceiling on growth is the carrying capacity, K, of the environment.
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Density-independent Forces
Factors that strike populations without regard for the size of the population
Mostly weather-based
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How many people can earth support?
Why does the answer keep increasing?
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14.5 Some populations cycle between large and small.
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Do lemmings jump off cliffs committing suicide when their populations get too big?
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14.6 “Maximum sustainable yield” is a useful but impossible-to-implement concept.
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Almost all natural resource managers working for the U.S. government fail to do their job exactly as mandated.
Why?
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What We Often Do Not Know…
Population carrying capacity
Number of individuals alive
Stability of carrying capacity from year to year
Which individuals to harvest
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14.7–14.9
A life history
is like a
species
summary.
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14.7 Life histories are shaped by natural selection.