Dynamic Ecosystems and Their Populations

New predators move into an ecosystem

A drought occurs for several months

A hurricane passes through an ecosystem

Living space is lost due to deforestation

Birth rate > Death rate

Emmigration > Immigration

Increase of predator

Death rate increases due to a forest fire

They can never change once they are established.

They constantly change in different ways over time.

Ecosystems always revert back to their original state.

Each ecosystem can exist for only a specific length of time.

predation

commensalism

mutualism

parasitism

parasitism

predation

commensalism

competition

gazelle - smaller population, so higher up in food web/ energy pyramid

lion - smaller population, so higher up in food web/ energy pyramid

gazelle - larger population, so higher up in food web / energy pyramid

lion - larger population, so higher up in food web / energy pyramid

Secondary occurs after a disturbance in an area that was previously uninhabited.

Secondary occurs after a disturbance in an area in which the soil has remained intact.

Secondary occurs over a longer period of time than primary succession.

Secondary occurs when animals are introduced to an area that had only plants.

No producers exist when the process begins.

Soil is present at the beginning of the process.

The process ends with the growth of large trees.

The sizes of the plants generally increase over time.

eutrophication

succession

carrying capacity

limiting factor

establishing homes in which animals can live

using chemicals to produce food

breaking down rocks into soil for plants to grow

adjusting the climate by altering the average temperature in a region

commensalism

consumerism

competition

cooperation

primary

secondary

not enough information is given

competition among two organisms over necessary resources

more predators of a prey

a tornado destroying an ecosystem

an invasive parasite attacks ash trees

they adapted to eat dust instead of grass

they were not affected because population size can't change over time

they decreased because the resources they needed were not available

they increased because other populations were eliminated from the environment

a population falls below the environment's carrying capacity

members of a population have different roles

organisms struggle for a limited resource

good conditions make resources plentiful