Ecosystem Basics
Energy Flow in Ecosystems
Biodiversity
Population Dynamics
Human Population
100

A group of two or more populations of different species living in the same area

Community

100

The primary source of energy for most ecosystems

The sun

100

Type of ecosystem service that provides humans with materials needed to survive or use

Provisioning service 

100

The maximum number of individuals that an ecosystem can support over the long-term

Carrying capacity

100

The average number of children a woman will have in her lifetime

Total fertility rate

200

A flea living on a dog's skin is what type of symbiotic relationship

Parasitism

200

Type of relationship when one organism consumes another for energy (Ex: wolf eats deer)

predator-prey

200

The number of species present in an ecosystem

Species richness

200

Raccoons and cockroaches can use many different resources and survive in many different habitats so they would be considered

Generalists

200
Population growth rate of a country with an age structure diagram that is wide at the base and narrow at the top

Rapid growth

300

An area's GPP = 50 kcal/m2/yr and respiration = 20 kcal/m2/yr. What is the NPP? 

30 kcal/m2/yr

300

The arrows in a food web show the

flow of energy
300

Type of ecological succession that occurs on lava flow after a volcanic eruption 

Primary succession

300

Ragweed plants produce thousands of seeds and have short life spans (annuals) so they are considered

r-strategists

300
Population growth rate = 5% 

What is the doubling time for this population? 

14 years

400

Step of the nitrogen cycle when decomposers break down dead organic matter returning nitrogen to the soil as ammonia 

Ammonification

400
Producers capture 5,000 J of energy from the sun. This amount of energy will be passed on to the primary consumers

500 J 

400
Environmental conditions outside an organism's optimal conditions causing difficulty such as decreased growth, fertility, or activity. 

Zone of physiological stress

400

Cycads bear cones, are long-lived with slow growth rates, show late reproductive maturity, and have very few offspring so they are considered

k-strategists

400

CBR = 20 

CDR = 5 

What is the natural increase rate? 

1.5%

500

Biome with average temperatures from -10 to 5ºC and 0-100 cm of annual precipitation. Found in Northern Alaska

Tundra

500

A snake preys on frogs which prey on grasshoppers which eat grass. If the frog population is eliminated, the amount of grass will

Decrease

500

Type of diversity that must exist in a population for natural selection to take place

Genetic diversity

500

Food, water, and habitat availability are what kind of limiting factors for a population

Density dependent

500

Stage of demographic transition of a country with a low brith rate, low death rate, high per capita GDP, and long life expectancy. 

Stage 4

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