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APES POPULATION NOTES AND DEFINITIONS GIVEN IN CLASS CHAPTER ONE

APES POPULATION NOTES AND DEFINITIONS GIVEN IN CLASS CHAPTER ONE. 08/13/2013. APES – POPULATION DYNAMICS Notes, CHAPTER 1

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APES POPULATION NOTES AND DEFINITIONS GIVEN IN CLASS CHAPTER ONE

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  1. APES POPULATION NOTES AND DEFINITIONSGIVEN IN CLASSCHAPTER ONE 08/13/2013

  2. APES – POPULATION DYNAMICS Notes, CHAPTER 1 "Never before has one species had such a great impact on the environment in such a short time and continued to increase at such a rapid rate. These qualities make the human population growth the underlying environmental issue.” Basic Concepts of Population Dynamics • Population: • A group of individuals of the same species living in the same area of interbreeding and sharing genetic information. • Species: All individuals that are capable of interbreeding. • Make up populations • Population dynamics: The general study of population changes. • Population Growth and Demography: • Demography: The science of human population growth • the term "population growth" refers to how the number of individuals in a population increases (or decreases) with time. • This growth is controlled by the rate at which new individuals are added to the population (the birthrate), and the rate at which individuals leave the population (the death rate)

  3. Crude Birth and Death Rates: • Crude birth and death rates (CBR and CDR) are the number of people in a particular population that are born or die, respectively, per 1000 of population. • CBR= number of births in a given year x 1000/population size • CDR= number of deaths in a given year x 1000/population size ***Note: per total population, not by gender • Annual population growth rate: • To calculate the annual population growth rate as a percentage change from the CBR and CDR. The formula is: • % annual growth rate (R) = (CBR-CDR/10) • Example: • In the last quarter of the 20th century, the global CBR was 29 and the CDR was 12.  The percent annual growth rate of the population was (29-12)/10 = 1.7% per year. • This means that if there were X number of people present at the beginning of the year, there were 1.017X present at the end of the year. • Age Structure • Population age structure: The proportion of the population in each age class • Affects current and future birth rates, death rates and growth rates • Has an impact on the environment • Has complications for current and future social and economic status.

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