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| Recall: What is the Definition of a population? |
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| A group of the same species that occur in an area |
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| Statistics that describe a population |
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| # of individuals in a population |
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| _?_ _?_ estimates the total number of individuals in an area based on the basis of direct counts in a small portion of that area |
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| _?_ _?_ is the number of individuals per unit of area or volume |
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| Occurs when enviromental resources are evenly distributed |
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| occurs when there is a patchy distribution of resources |
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| occurs when the distribution of resources allows for even spacing of individuals |
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| Which of the population distributions is seen most often in nature? |
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| # of individuals of various age categories |
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| What two events add members to a population? |
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| What two events subtract members to a population? |
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| when would zero population growth occur? |
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| The per capita growth rate (r) is equal to the _?_ rate minus the _?_ rate |
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| To determine the population increases per unit of time (G), you would multiply the _?_ times the _?_ |
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Definition
| growth rate; # of individuals |
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| What is the shape of the curve that displays exponential growth? |
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| The faster a population increases in size, the longer/shorter the doubling time |
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| The maximum possible increase in population growth under optimal conditions is called the _?_ _?_ for that group |
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| Any essential resource that is in short supply for a population will be a _?_ _?_ for population growth |
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| From your own experience, give some examples of limiting factors on population growth |
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| The _?_ _?_ of any particular environment is the maximum number of individuals that can be sustained indefinitely |
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| In logistic growth, the J-shaped curve changes to an _?_ shape as the numbers reach the carrying capacity |
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| Crowding, competition, pathogens, and disease are all examples of density-_?_ factors |
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| Fires, snowstorms, hurricanes and other natural disasters are all examples of density-_?_ factors |
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| What can you learn from a life table? |
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Definition
| age @ maturity, # offspring/reproductive event, life span, death rate |
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| born @ more or less the same time |
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| Individuals die in large numbers at early age |
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| Survivorship is high until late in life |
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| Individuals die at a fairly constant rate throughout life |
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| How many years did it take for the Earth's human population to double from 1B to 2B? |
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| In modern history, the shortest doubling time occurred between the years of _?_ and _?_ when the population when from 3B to 6B |
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| Give THREE reasons why the world's human population has been able to increase so rapidly in the past 200 years |
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| Fossil fuels, grow food, controlling disease agents |
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| What is the expected world population of humans in the year 2050? |
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| What has happened to the total fertility rate of the human population in the past 50 years? |
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| How many children must a female bear to reproduce at the replacement fertility rate? |
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| Why are the red bars wider for the United States than India? |
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| US has a lower death rate |
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| Which country has the greatest potential for increase in human population in the future? |
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| To maintain the life-style that we all like, USA requires _?_ times as the average world citizen |
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