Textbook Notes (280,000)

CA (170,000)

UTSC (20,000)

Biological Sciences (900)

BIOA02H3 (100)

Kamini Persaud (50)

Chapter 54

Department

Biological SciencesCourse Code

BIOA02H3Professor

Kamini PersaudChapter

54This

**preview**shows half of the first page. to view the full**3 pages of the document.**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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