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Chapter 54

# Chapter 54

Department
Biological Sciences
Course Code
BIOA02H3
Professor
Kamini Persaud
Chapter
54

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â€¢A population consists of the individuals of a species within a given area.
â€¢The age distribution of individuals in a population and the way those individuals are
spread over the environment describe its population structure
â€¢Population density is the number of individuals of a population per unit of area
â€¢Demographic events are events that change the structure of the population such as
death, birth, migration and emigration
â€¢Molecular markers are used such as hydrogen isotopes to determine where birds
molt during their migrations
â€¢Counting ever individual in a population is sometimes impossible so statistical
methods are used to estimate population size from samples
â€¢N1 is the number of marked individuals in the first sample
â€¢N2 is the number of individuals in the second sample
â€¢M2 is the number of marked individuals in the second sample
â€¢N is the estimated size of the population
â€¢The formula is : N1 X N2 = M2 X N
â€¢N1= N0+B â€“ D + I â€“ E
â€¢N1= the number of individuals at time 1
â€¢N0 = the number of individuals at time 0
â€¢B = the number of individuals born between time 0 and time 1
â€¢D = the number of individuals that died between time 0 and time 1
â€¢I = the number of individuals that immigrated between time 0 and time 1
â€¢E= the number of individuals that emigrated between time 0 and time 1
â€¢A life table is a useful way to display information about birth and death rates in a
population
â€¢Cohort is a group of individuals born at the same time
â€¢Survivorship is the number that are still alive at later dates
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