Ecosystems

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what is the definition of habitat
meets all the environmental conditions an organism needs to survive
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what is the definition of ecological niche
the functional position of an organisms in its environment. made up of the organisms habitat, it activity patters and resources it obtains from its habitat
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what is the definition of a
population
all of the organims of one species, who live together at the same time and who can breed together
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what is the definition of a community
All the populations of different species, who live in the same place at the same time and who can interact
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what is the definition of an ecosystem
A community of animals, plants and bacteria interrelated with the physical and chemical environment.
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what is the definition of an abiotic factor
The physical and chemical factors that influence populations in a community. These are the non-living factors.
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what is the definition of a biotic factor
The physical factors that influence populations in a community. These are the living factors.
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what is the definition of a producer
Organisms that produce biomass by converting energy from the Sun into chemical energy – autotrophs.
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what is the definition of a consumer
Consumers are unable to make their own energy, and instead rely on the consumption and digestion of producers or other consumers, or both, to survive.
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what is the definition of a decomposer
Decomposers are organisms that break down dead or decaying organisms, they carry out decomposition, a process possible by only certain kingdoms
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what is the definition of biomass
The total mass of plants and/or animals living in one place.
Can be measured as fresh mass or dry mass.
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what is the definition of pH
A measure of acidity or alkalinity of water-soluble substances.
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what is the definition of relative humidity
The amount of water vapour present in air expressed as a percentage of the amount needed for saturation at the same temperature.
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what is the definition of air temperature
The falling of liquid rain or precipitation
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what is the definition of rainfall
the quantity of rain falling within a given area in a given time
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what is the definition of salinity
The measure of all the salts dissolved in water. Salinity is usually measured in parts per thousand (ppt).
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what is the definition of altitude
Height of an object or land mass in relation of sea level
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what id the definition of radiation
The emission of energy as electromagnetic waves or as moving subatomic particles.
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what are the three main groups that affect populations
cyclical changes, directional changes and unpredictable or erratic changes
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what is an example of a cyclical change
day and night cycles, oceans and sea tides and season
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what are examples of directional change
fruit ripening, global warming and river changes
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what are examples of unpredictable or erratic changes
effects of natural disasters e.g. tsunamis, earthquakes or volcano eruptions, and manmade disasters/events - oil spills, nuclear accidents or global warming
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what is the definition of a trophic level
A ‘feeding’ level within a food chain or ecological pyramid
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what is the definition of a food chain
A feeding hierarchy in which organisms I an ecosystem are grouped into trophic level and are shown ins succession to represent the flow of food energy
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what is the definition of a food web
A graphical model showing the interconnecting food chains in an ecosystem
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what is the definition of the dry mass of an organism
The dry matter of a sample as a reliable measure of biomass
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what is the definition of ecological efficiency
Describes the efficiency with which energy is transferred from one trophic level to the next (around 10% but this can vary)
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how do you calculate ecological efficiency
biomass at the higher trophic level/ biomass at the lower trophic level x 100
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what is the definition of ecological niche

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the functional position of an organisms in its environment. made up of the organisms habitat, it activity patters and resources it obtains from its habitat

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what is the definition of a
population

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Card 4

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what is the definition of a community

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what is the definition of an ecosystem

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