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19bio5785
CU intro to bio: lecture 18
| Question | Answer |
|---|---|
| Population density relates to | the number of individuals per certain area |
| population distribution indicates | where the individuals are positioned in a certain area |
| Clumped Distribution | apattern in which the individuals are in a small area such as when surrounding a water supply |
| uniform distribution | a pattern in which the individals are more evenly spaced |
| random distribution | a pattern in which the individuals have no uniformity to their placement |
| Quadrants | are plots of land of a standard size used for counting the number of organisms |
| the capture-recapture method | is used to estimate the size of a population of animals |
| ToF:Members of a population may leave (emigration) or enter (immigration) a new population. | true |
| WHat happens when zero growth occurs? | When zero growth in a population occurs, it means that the number of individuals being born equals the number dying. |
| per capita growth rate | Equals the birth rate minus the death rate |
| the biotic potential | indicates the larges amount of increase that can occur in that particular population Miotic potential = maximum rate of increase per individuals under ideal conditions |
| The carrying capacity is | the larges number of individuals that a certain environment can support.... an S-shaped curve is indicative of how a population naturally changes |
| Limiting factors are components that | are not plentiful and may restrict population growth |
| Density-dependent factors | are those that become more critical as the population increases. (food, water, disease) |
| Density-independent factors | are those that are not influenced by the size of the population. (floods, fires, earthquakes) |
| life tables indicate | the number of individuals that survie in various age catagories |
| A survivorship curve is | a visual representation of the age-specific survival of a population. |
| Type I, curves | a. Show that the individuals usually survive until old age b. Animals produce a small amount of offspring that require much care c. Ex: elephants, humans. |
| Type II, Curves | a. Illustrate that the survival rate does not relate to age b. Ex: squirrels. |
| Type III, curves | a. Show that the majority of the individuals do not survive to maturity b. Animals produce many offspring that do not require much care c. Ex: sea urchins, many insects |
| The human population's current rate of increase is ? | 1.2% |
| What is this growth rate due to?(3X) | New habitats, New Technologies, Overcome limiting factors |
| New habitats... | Humans can spread easily into new habitat. |
| New Technologies | We have developed new technologies to increase the carrying capacity of the environment. |
| Overcome limiting factors | we have learned how to overcome some limiting factors. combat disease, use fossil fuels for energy production. |
| the total fertility rate. | The average number of children born to each woman of reproductive age |
| The fertility rate worldwide has decreased from ____ to ____ in the last _____ years | 6.5 to 2.7 in the last 50yrs |
| ToF: one third of the worlds population is not yet in the reproductive category | TRUE! wow |
| The demographic transition model | |
| The amount of individuals over age 65 is increasing due to several factors | fertility rates are declining individuals are living longer due to medical advances |
Created by:
jseekins
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