LECTURE12 PopCommEcology1

LECTURE12 PopCommEcology1 - Chapters 52 and 53 Population...

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Slide 1 Population and Community Ecology Chapters 52 and 53 Population and Community Ecology 52.1. 52.2., (skim 52.3-5), 52.6, 53.1 - 53.2 finish reading 53.3-53.5 and chapter 54
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Slide 2 Population and Community Ecology Populations in relation to their environment Population- group of individuals of the same species living in the same place at the same time Population ecology- the study of populations in relation to environment Including environmental influences on population density and distribution, age structure, and variations in population size
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Slide 3 Population and Community Ecology Density and Dispersion Density is the number of individuals per unit area or volume Dispersion is the pattern of spacing among individuals within the boundaries of the population
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Slide 4 Population and Community Ecology 3 possible types of spacial patterning random random clumped clumped uniform uniform
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Slide 5 Population and Community Ecology Clumped dispersion QuickTime w and a TIFF (Uncompressed) decompressor are needed to see this picture.
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Slide 6 Population and Community Ecology Uniform dispersion QuickTime v and a TIFF (Uncompressed) decompressor are needed to see this picture.
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Slide 7 Population and Community Ecology Random dispersion QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture.
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Slide 8 Population and Community Ecology Demography the study of the size and structure of populations and how they change through time population size depends on inputs from birth and immigration vs. outputs from death and emigration
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Slide 9 Population and Community Ecology Life Tables summarizes probability that an individual will survive and reproduce during any particular time interval throughout its lifetime used by population biologists, conservation biologists, life insurance companies
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Slide 10 Population and Community Ecology The survivorship curve for Belding’s ground squirrels shows that the death rate is relatively constant Figure 52.4, pg. 1140 1000 100 10 1 Number of survivors (log scale) 0 2 4 6 8 10 Age (years) Males Females
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Slide 11 Population and Community Ecology Survivorship curves can be classified into three general types Type I, Type II, and Type III Figure 52.5, pg. 1140 I II III 50 100 0 1 10 100 1,000 Percentage of maximum life span Number of survivors (log scale)
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Slide 12 Population and Community Ecology urvivorship in humans pre- & post- 1950
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Slide 13 Population and Community Ecology Life history traits as products of natural selection semelparity (big-bang reproduction), more common in unpredictable environments iteroparity (repeated reproduction), favored in dependable environments
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Slide 14 Population and Community Ecology Growth Rates 52.3 - 52.5 ideal conditions, unlimited resources exponential growth carrying capacity life histories and population densities competitors, resources, health, territories, predation, toxic waste, immigration, emmigration, stability/fluctuation, etc.
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This note was uploaded on 02/19/2008 for the course BISC 120Lg taught by Professor 11:00-01:50pm during the Fall '06 term at USC.

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LECTURE12 PopCommEcology1 - Chapters 52 and 53 Population...

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