Populations Flashcards

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Abiotic
Non-living components e.g. temperature/rainfall
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Biotic
Living components e.g. competition/predation
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Ecosystem
The combination of the biotic and abiotic factors within a specific area, e.g. a lake
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Population
A group of interbreeding organisms of one species in a habitat.
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Species
A group of similar individuals capable of breeding to form fertile offspring.
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Community
All the populations of different organisms living and interacting in a particular place at the same time.
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Habitat
The place where a community of organisms lives.
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Microhabitat
Smaller units within a habitat, each with their own microclimate.
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Ecological Niche
How an organism fits into the environment - where it lives and what it does there. This includes its interactions with the biotic and abiotic features.
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Abundance
The number of individuals of a species in a given space.
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Frequency
The likelihood of a particular species occurring in an area.
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Percentage Cover
An estimate of the area within a quadrant that a particular plant species covers.
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Intraspecific Competition
Competition between individuals of the same species for resources e.g. food, water
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Interspecific Competition
Competition between individuals of different species for resources e.g. food, water
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Predation
The relationship between two organisms of different species where one has the role of predator and the other becomes its prey.
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Selection Pressure
When individuals who are able to escape predation survive to reproduce passing on certain genetic traits.
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Birth Rate
The ratio of live births in an area to the population of the area, expressed per 1000 population per year
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Death Rate
The ratio of deaths in an area to the population of the area, expressed per 1000 per year.
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Migration
The movement of individuals from one population to another.
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Immigration
When individuals join a population from the outside.
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Emigration
Where individuals leave a population
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Stable Population
When birth rate and death rate are in balance, there is no increase or decrease in the population size.
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Increasing Population
Where there is a high birth rate producing a wide base of a population pyramid. Common for LEDCs.
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Decreasing Population
Where there is a lower birth rate and a low death rate so the base of the population pyramid is narrow and the top is wider. Common in MEDCs.
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Average Life Expectancy
The age at which 50% of the individuals of a population are still alive.
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Other cards in this set

Card 2

Front

Living components e.g. competition/predation

Back

Biotic

Card 3

Front

The combination of the biotic and abiotic factors within a specific area, e.g. a lake

Back

Preview of the back of card 3

Card 4

Front

A group of interbreeding organisms of one species in a habitat.

Back

Preview of the back of card 4

Card 5

Front

A group of similar individuals capable of breeding to form fertile offspring.

Back

Preview of the back of card 5
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