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Lecture

bio434 lec 3.docx

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Department
Biology
Course Code
BIO434H5
Professor
Maria Arts

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02/22/2014 Lecture 3 Focus and concerns Populations: ­the  # composition distribution of people in relation to variations in conditions across the globe ­unequal distribution of pop ­significant variation in pop dynamics(birth rate, death rate , growth rate) ­concern of disconnect populations  and resources Population dynamics: births Crude Birth Rate (CBR): # of live births(LB) in one year multiplied by the total population (TP) divided by 1000[ LB/ TP *1000 =CBR] Some geographic patterns that influence birth rate  are: Economic structure Social structure Cost of children Role of women in society Population dynamic death: # of of death (ND) in one year divided by the total populations(TP) multiplied by 1000s [ND/TP*1000=CDR] Geographic patterns that influence death rate: Economic structure: Influence food supply,water,medical facilities Social structure: Welfare,role of women Cause of death : Geographical variations Structure of populations: Proportions of young/old in population Population  Growth Rate of natural increase: NRI= CBR­CDR CBR 35 by 1000 people CDR  5 by 1000 people NRI = 30 by 1000 people Divide by 10 to express Double time = 70/ RNI Problems with crude measurements: ­does not consider the population structures ­to overcome these processes you have to included other indices ­The increase of pop, gives us a perdicive perspective on society ­rate of natural increase, doubling time ­immgiration helps to stabilize pop and grow pop ­ problems with crude measurm
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