Anjali- AP Enviromental- Chapter 4

Anjali- AP Enviromental- Chapter 4 - APES Ch. 4 Notes- The...

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APES Ch. 4 Notes- The Human Population and the Environment 4.1 Notes 1. How Populations Change Over Time: Basic Concepts of Population Dynamics a. General Information i. Population - a group of individuals of the same species living in the same area or interbreeding and sharing genetic information. ii. Species - all individuals that are capable of interbreeding 1. Made up of populations iii. Five key properties of population are: abundance, birth rates, death rates, growth rates and age structure. iv. Population dynamics - the general study of population changes. v. Four general types of age structures are: a pyramid, a column, an inverted pyramid (top-heavy), and a column with a bulge. vi. Pyramid age structure- occurs in population with many young people and a high death rate at each age- short lifespan vii. Column shape- the birth rate and death rate are low and a high percentage of the population is elderly. viii. Bulge- occurs if some event in the past caused a high birth rate or death rate for some age group but not others. ix. In today’s developing countries, about 35% of populations are under 15 years of age. 4.2 Notes 2. Kinds of Population Growth a. General Information i. Hunters and Gatherers - the world’s population was probably less than a few million ii. Early, pre-industrial agriculture 1. Allowed a much greater density of people
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This note was uploaded on 09/15/2011 for the course ENVIRON 100 taught by Professor Staff during the Spring '11 term at UC Irvine.

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Anjali- AP Enviromental- Chapter 4 - APES Ch. 4 Notes- The...

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