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Landscape Ecology Unit 2
Study Cards for Vocab
23
Biology
Undergraduate 4
04/15/2014

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Term
Habitat
Definition
Natural home environment of an organism. Meets its needs.
Term
Stochasticity
Definition
Unpredictable events with a more than 0 likelihood of occurring.
Term
Extinction Debt
Definition
Habitat loss occurs to unsustainable levels before a population goes extinct. We dont know until it is too late.
Term
Disturbance
Definition
A relatively discreet event that disrupts the structure of an ecosystem, community, or population
Term
Synergism
Definition
One disturbance event affects another disturbance event
Term
Intensity
Definition
Force per unit area (Measurable)
Term
Severity
Definition
The resulting impact on the ecosystem of a disturbance
Term
Rotation period
Definition
The mean time that it takes to disturb an area equal in size to the study area
Term
Return Interval
Definition
The frequency of the disturbance
Term
Residuals
Definition
The biotic portion of a landscape that is left in tact after a disturbance event.
Term
Productivity
Definition
Term
GPP
Definition
Total photosynthesis (carbon in) of an ecosystem
Term
NPP
Definition
Total respiration (carbon out) by plants
Term
NEP
Definition
Total respiration (carbon out) by plants and animals
Term
Flux
Definition
Movement of production in or out of the ecosystem.
Term
Watershed
Definition
the area of land that drains into a common outlet (single point)
Term
Topographic divide
Definition
Water runoff over the surface
Term
Pheatic Divide
Definition
Water runoff under the surface (underlying geology)
Term
Pressure potential
Definition
Gravity, turgor pressure
Term
Osmotic Potential
Definition
Dissolved substances. Flow from low to high.
Term
Matric potential
Definition
Attraction of water to itself and other substances
Term
Pore Volume
Definition
Overall amount of space in the soil column
Term
Permanent Wilting Point
Definition
the point where plants are no longer able to extract water from the soil.
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