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Flashcards in Ecology Deck (21):
1

Pioneer Species

The beginning species of the ecosystem

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Population

The number of organisms in a species

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Secondary Succession

Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat. Examples include areas which have been cleared of existing vegetation (such as after tree-felling in a woodland) and destructive events such as fires.

4

Stability


the state of being stable. When prey and predator populations are around the same number

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Climax community

An ecological community in which populations of plants or animals remain stable and exist in balance with each other and their environment. A climax community is the final stage of succession, remaining relatively unchanged until destroyed by an event such as fire or human interference. See more at succession.

6

Disturbance

In biology, a disturbance is a temporary change in environmental conditions that causes a pronounced change in an ecosystem. Disturbances often act quickly and with great effect, sometimes resulting in the removal of large amounts of biomass.

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Density Dependent Factor

Density-dependent factors are factors where the effects on the size or ... Biotic variables are all of the living organisms within an ecosystem.

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Density independent factors

Population ecologists commonly divide the factors that affect the size of populations into density-dependent and density-independent factors. Density-independent factors, such as weather and climate, exert their influences on population size regardless of the population's density.

9

Primary succession

Primary succession is one of two types of biological and ecological succession of plant life, occurring in an environment in which new substrate devoid of vegetation and other organisms usually lacking soil, such as a lava flow or area left from retreated glacier, is deposited.

10

Inbreeding

The mating of two closely related persons. Also called consanguinity. The act of mating closely related individuals.

11

Dispersion

In ecology, this is referred to as dispersal. Dispersal is when individuals (plants or animals) move from where they were born to, typically, a breeding or growing site. Individuals may disperse actively or passively. Active dispersal is when organisms move from one location to another without assistance.

12

Immigration

the increased immigration strengthened the colony.The movement of organisms to an area.

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Emigration

When organisms leave the colony or area

14

Birth Rate

The number of births in a certain population or species

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Growth Rate

How the population is increasing over the years

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Ecological Succession

Ecological succession is the observed process of change in the species structure of an ecological community over time.

17

Life Expectancy

How long an organism or species is going to live

18

Agricultural Revolution

The Agricultural Revolution was a time of agricultural development that saw many changes on how organisms ate and how much land there was

19

Hunter Gatherer Lifestyle


A hunter-gatherer or early human society is one in which most or all food is obtained ... In the gradual process of families improving their immediate environment

20

Death Rate

How many organisms die in a population

21

Population density

How many and what kind of species live in a certain area or ecosystem