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17 Cards in this Set

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Primary Producer

- autotrophs (self-feeder)


- an organism that can synthesize its own food from inorganic sources (usually via photosynthesis)


- Do not create energy, only transform it

Gross Primary Productivity (GPP)

- Total amount of chemical energy produced in a given area and time period

Net Primary Productivity (NPP)

- energy that is invested by primary producers in building new tissue or offspring




NPP = GPP - R (where R is the energy used in cellular respiration or lost as heat)

Food Chain

- focuses on one possible pathway of energy flow among trophic (feeding) levels in an ecosystem

Food Web

- includes ALL the organisms interacting in an ecosystem along with estimates of the amount of energy transferred at each link

Efficiency

- fraction of biomass transferred from one trophic level to the next

Who is more efficient, ectotherms or endotherms?

- Ectotherms


- they don't have to spend energy maintaining temperature

Biomagnification

- increase in concentration at higher levels in a food chain of persistent pollutants (toxins)

Trophic Cascade

- when changes in top-down control cause clear effects two or three links away in a food chain


- E.g. Yellowstone Wolves

Is NPP higher on land or in water and why?

- higher on land


- because much more light is available

Biochemical Cycle

- the path an element takes as it moves from abiotic systems through producers, consumers and decomposers and back again

Water Level

- the level where soul is saturated with stored water

Positive Feedback in Climate Change

- changes due to global warming result in the further acceleration of warming

Negative Feedback in Climate Change

- changes due to global warming result in increased and separation of CO2 and other green house gases

Phenology Shift

- changes in the timing of seasonal events

Geographic Range Shift

- geographic redistribution of species to more favorable climate envelopes


- can change ecological interactions

Acidification

- the ocean becomes more acidic as it absorbs CO2