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Unit 4 – The Natural Environment and Species Survival

ECOLOGY
What is GPP?
-Gross Primary Productivity
-It is the rate at which energy is incorporated into organic molecules by an ecosystem
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What are the two main ways that carbon dioxide in the atmosphere can be balanced?
-Use of biofuels
-Reforestation
What is a biofuel?
-It is a source of energy produced, directly in plants or indirectly in animals, by recent
photosynthesis
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How are new species formed?
-They are formed through speciation
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What is a biotic factor?
-It is a factor created by a living thing within an environment in which the action of an
organism affects the life of another organism e
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predation and competition
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What are the three main groups of abiotic factors called?
-Climatic factors e
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sunlight, humidity, temperature, atmosphere etc
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g
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-Social factors e
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land use, water resources etc
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What is a habitat?
-It is the place with a distinct set of conditions where an organism lives
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What is a community?
-It is the various populations sharing a habitat or an ecosystem that make up a community
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What is primary succession?
-It starts in a newly formed habitat where there has never been a community before
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g
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What do they pioneer species do?
-They start to break up the rock surface allowing more organic material to build up
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What are the eventual conditions that form?
-A community dominated by trees is reached which creates a stable climax community
which often remains unchanged unless conditions in the habitat change
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What is deflected succession?
-It is a community that remains stable only because human activity prevents succession
from running its course
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