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18 Cards in this Set
- Front
- Back
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Parasitism
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a relationship in which an organism feeds on the body fluids or tissues of another.
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Host
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The organism on which a parasite feeds on
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Symbiosis
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Any relationship in which two species live closely together.
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Commensalism
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A symbiotic relationship that benefits one species but neither benefits nor harms the other.
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Mutualism
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A symbiotic relationship when both species benefit.
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Primary Succesion
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The sequence of communities forming in an originally lifeless habitat.
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Lichen
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A fungus and an alga living in a mutualistic relationship.
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Pioneer Community
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The lichen community which is first to colonize a new area.
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Climax community
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A community that does not undergo further succession.
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Secondary succession
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Succession that occurs where a disturbance eliminates most organisms but does not destroy the soil.
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Aquatic and Island succession
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Aquatic - as time passes, the water becomes a fertile meadow and may turn to a forest.
Island - The first organisms choose their niche, then through generations, the offspring evolve to fill the other niches. |
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Stability
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A measure of how easily an ecosystem is affected by a disturbance and how quickly it returns to its original condition after a disturbance.
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Equilibrium
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When a disrupted ecosystem returns to a state of balance.
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Chaos Theory
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A theory that ecosystems may be sensitive to very small changes, and that the initial state of an ecosystem is crucial to its later development.
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Impacts of Human Population:*
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-Introduction of foreign species to new ecosystems
-The pollution of fresh water -Habit destruction |
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Biome
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A major type of ecosystem with distinctive temperature, rainfall, and organisms.
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Biomass
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The total mass of organic material in an ecosystem.
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The eight major biomes:*
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-Desert
-Tundra -Coniferous Forest -Deciduous Forest -Rain Forest -Steppe -Prairie -Savanna |
