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18 Cards in this Set

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Parasitism
a relationship in which an organism feeds on the body fluids or tissues of another.
Host
The organism on which a parasite feeds on
Symbiosis
Any relationship in which two species live closely together.
Commensalism
A symbiotic relationship that benefits one species but neither benefits nor harms the other.
Mutualism
A symbiotic relationship when both species benefit.
Primary Succesion
The sequence of communities forming in an originally lifeless habitat.
Lichen
A fungus and an alga living in a mutualistic relationship.
Pioneer Community
The lichen community which is first to colonize a new area.
Climax community
A community that does not undergo further succession.
Secondary succession
Succession that occurs where a disturbance eliminates most organisms but does not destroy the soil.
Aquatic and Island succession
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.
Stability
A measure of how easily an ecosystem is affected by a disturbance and how quickly it returns to its original condition after a disturbance.
Equilibrium
When a disrupted ecosystem returns to a state of balance.
Chaos Theory
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.
Impacts of Human Population:*
-Introduction of foreign species to new ecosystems

-The pollution of fresh water

-Habit destruction
Biome
A major type of ecosystem with distinctive temperature, rainfall, and organisms.
Biomass
The total mass of organic material in an ecosystem.
The eight major biomes:*
-Desert
-Tundra
-Coniferous Forest
-Deciduous Forest
-Rain Forest
-Steppe
-Prairie
-Savanna