Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Green Generation 1
Ecology of Populations
| Term | Definition |
|---|---|
| Population | Group of individuals of the same species occupying a common geographical area |
| • Population Ecology | The study of how populations interact with their environment |
| • Population | Group of individuals of the same species occupying a common geographical area |
| • Habitat | Where a species normally lives |
| Characteristics of populations | Each population has certain characteristics such as population size, population density, population distribution, age structure. |
| • Population size | Number of individuals making up its gene pool |
| • Population density | Number of individuals per unit of area or volume, e.g.persons/square mile |
| • Population distribution | The general pattern in which the population members are dispersed through its habitat, may be: Clumped (most common), Uniformly dispersed (rare), or Randomly dispersed |
| • Age structure | Defines the relative proportions of individuals of each age: Pre-reproductive, Reproductive, and Post-reproductive |
| • Zero population growth | A near balance of births and deaths |
| • biotic potential | The maximum rate of increase under ideal conditions. Few populations live under ideal conditions because a number of factors limit their growth |
| • Limiting factor | Any resource that is in short supply, e.g. food, minerals, light, living space, refuge from predators, etc. |
| • Carrying capacity | Maximum number of individuals of a species or population a given environment can sustain. Each habitat or area can only support so many individuals |
| • Cohort | A group of individuals born at the same time, e.g. baby boomers are a large group of individuals born just after World War II |
| Life Table | An age-specific death schedule |
| Survivorship schedule | For each age interval there is an predicted life expectancy or survivorship |
| • r-selected organisms | Put most of their energy into rapid growth and reproduction--Unpredictable environments (weeds) |
| • K-selected organisms | Put most of their energy into growth--stable environments--(Redwood trees) |
| Population growth mathematical equation | G=rN (G = population growth per unit time, r = rate of increase and N= the number of individuals) |
| Logistic Growth | S shaped curve--(Early on populations will exhibit very rapid growth but as they near the carrying capacity they will level off) |
| Density dependent | The growth of a population is affected by the density of individuals (26 reindeer in 1910--by 1940 2000 reindeer, no food 8 reindeer in 1950) |
| Density-independent factors | Population size and growth may also be controlled by adverse weather, floods, droughts, cold temperatures etc. |
Created by:
bemcbee
Popular Science sets