Definitions

All the key terms in this topic

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Ecosystems
All the living organisms and non living components ina specific habitat and how they interact
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Decomposers
Organisms that feed on dead organic matter releasing molecules, minerals and energy that are available to living organisms int he ecosystem.
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Habitat
Where an organism or populations of organisms live
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Denitrifying bacteria
Bacteria that converts nitrates into nitrogen gas, under anaerobic conditions, they use the nitrates as a source of oxygen for respiration
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Biodiversity
The number and variety of organisms found in the world, ecosystems or habitat
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Community
All the populations of different species living in the same place at the same time that interact with each other.
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Pioneer community
The living organisms that first colonise bare ground eg algae and lichen
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Population
All of the organisms of one species int he same place at the same time that can breed together
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Sere
A recognised stage in succession
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Interspecific
Competition for resources between different species eg for food space.
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conservation
The maintenence of diversity, including diversity between species, genetic diversity within species and maintenance of habitats and ecosystems
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Nitrifying bacteria
Organisms that obtain energy from chemical processes eg NITROSOMONAS-oxidise ammonium ions to nitrates
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Nitrogen fixing bacteria
Bacteria that are in the soil or root nodules that convert NITROGEN GAS into AMMONIUM IONS
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Carrying capacity
The maximum population size that can be maintained over a period of time in a particular habitat.
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Abiotic factor
A non living component eg water, space
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Biotic Factor
effect of a living component eg parasite
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Climax community
a final stable community eg a woodland
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Trophic level
The level that an organism feeds in a food chain
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Coppicing
cutting trees down to ground level, wood can be used, trees can regrow, further pollarding is possible
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Succession
A directional change in a community over time, starting with pioneer plants and ending with a climax community, goes through seres
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Dry mass
Used to construct a pyramid of biomass. Calculated by drying an organism in an oven at 80C to evaporate all the water.
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niche
the role that a species plays in a ecosystem, inlcuding interaction with living and non living things
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Intraspecific competition
Competitions between organisms of the same species for a resource eg food
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Limiting factor
A variable that limits the rate of a particular process. If increased the process occurs at a faster rate
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Pollarding
Cutting small quantities of wood of a tree (branches) branches will regrow and wood can be used.
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Other cards in this set

Card 2

Front

Organisms that feed on dead organic matter releasing molecules, minerals and energy that are available to living organisms int he ecosystem.

Back

Decomposers

Card 3

Front

Where an organism or populations of organisms live

Back

Preview of the back of card 3

Card 4

Front

Bacteria that converts nitrates into nitrogen gas, under anaerobic conditions, they use the nitrates as a source of oxygen for respiration

Back

Preview of the back of card 4

Card 5

Front

The number and variety of organisms found in the world, ecosystems or habitat

Back

Preview of the back of card 5
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