Any group of living organisms and non-living things occurring together in a habitat, and the interrelationships between them
Ecosystem
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The place where an organism lives
Habitat
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All the populations of different species that live in the same place at the same time
Community
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All the organisms of one species that live in the same place at the same time, and that can breed together
Population
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The role that each species plays in an ecosystem is called its
Niche
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How and what an organism feeds on, what it excretes, how it reproduces etc is a description of
Niche
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Biotic factors include
Food supply, predation and disease
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Autotrophic organisms that convert light energy into chemical energy , which they then supply to consumers
Producers
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Herbivores that feed on plants and eaten by carnivorous secondary consumers
Primary consumers
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Feed on waste material or dead organisms
Decomposers
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The level at which an organism feeds in a food chain is called
Trophic level
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Energy remains stored in dead organisms and waste material, which is then only available to
Decomposers
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To construct a pyramid of energy
The organisms are burned in a calorimeter to work out how much heat energy is released per gram
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Pyramids of energy have limitations, as population sizes fluctuate over time, this may provide a distorted idea of the efficiency of energy transfer and
They only take a snapshot of an ecosystem at one moment in time
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A pyramid of energy flow is used to look at
The rate at which energy passes though each trophic level
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The rate of energy flows through each trophic level is a measure of
Productivity
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At the base of the food chain, the productivity of plants is called
Primary productivity
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The gross primary ______ is the rate at which plants convert light energy into chemical energy
Productivity
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A directional change in a community of organisms over time
Succession
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Development of a community from bare ground is known as
Primary succession
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These are the first species to occupy a new habitat, starting new communities. They have rapid reproductive strategies, enabling them to quickly occupy an uninhabited area. Many have an asexual stage to their reproduction
Pioneer species
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When a final stable community is reached it is known as a
Climax community
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Other cards in this set
Card 2
Front
The place where an organism lives
Back
Habitat
Card 3
Front
All the populations of different species that live in the same place at the same time
Back
Card 4
Front
All the organisms of one species that live in the same place at the same time, and that can breed together
Back
Card 5
Front
The role that each species plays in an ecosystem is called its
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