Term
| Type I survivorship curve |
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Definition
| Survival is high until old age |
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Term
| Type II survivorship curve |
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Definition
| Mortality is spread evenly among all age groups |
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Term
| Type III survivorship curve |
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Definition
| Very high mortality among the young |
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Term
| 2.List the factors that influence population growth rates and population density. |
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Definition
r = b - d
Sex Ratio—Relative number of males and females in a population.
Age Distribution—Number of individuals of each age in the population.Dispersal: Movement of individuals
Emigration: leaving a population, often from crowded areas or in response to environmental change
Immigration: emigrating individuals become immigrants in a new population (joining a population) |
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Term
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Definition
| Number of individuals per unit area. |
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Term
| 3.Describe the difference between exponential and logistic growth and why populations don’t grow exponentially forever. |
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Definition
exponential-The number of individuals in each generation is a multiple of the previous generation
Logistic growth describes this “S” shaped growth curve. |
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Term
| 4.Tell the four main factors determining carrying capacity. |
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Definition
Raw material availability
Energy availability
Waste accumulation and disposal
Organism interaction |
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Term
| 5.Explain why populations cycle. |
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Definition
| See lynx hare example in slides |
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Term
| 6.Know the key life history traits. |
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Definition
Life history traits – characteristics of an individual that influence survival and reproduction
Age at maturity
Number of offspring produced
Number of reproductive events |
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Term
| 1.Describe the past, present, and projected future world population of humans (explain figure on slides 3 & 4). |
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Definition
| population has become exponential graph, shot up. |
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Term
| 2.List the 6 factors that affect human population growth rate. |
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Definition
Same as for other species:
Birth rate
Death rate
Sex ratio
Age distribution
Immigration/emigration
Density |
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Term
| 3.Explain why women have more children in male-dominated societies and fewer children in developed countries. |
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Definition
| In male-dominated societies, traditional role of women is to marry & have children |
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Term
| 4.List the two factors have the greatest control on birth rates. |
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Definition
1. Cultural role/status of women
2. Desires of women to have children
& access to birth control |
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Term
| 5.Recall the current size of the World Population and the US Population. |
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Definition
U.S. 310,825,424
(10 million more than one year ago)
World 6,900,142,775 |
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Term
| 6.Explain how political policies in China and India changed their population growth rates. |
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Definition
China, 1 child law in 1979
India:
1. Little government intervention until recently
2. Some states emphasizing improving quality of life
Decrease infant mortality
Encourage education for women
3. Others enforcing sterility |
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