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Ecology and Conservation > Primary production > Flashcards

Primary production Flashcards

1
Q

What is meant by primary production?

A

The amount of energy that autotrophs convert into usable chemical energy (organic compounds)

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2
Q

Global energy budget determines the amount of energy available for consumption by:

A
  • herbivores
  • detrivores
  • carnivores
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3
Q

Primary production is driven by?

A

Solar energy

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4
Q

What happens to 1% of visible light that strikes photosynthetic organisms?

A

converted into chemical energy

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5
Q

what are photosynthetic accessory pigments?

A

chlorophyll/carotenoids/phycobilins

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6
Q

What is gross primary production?

A

GPP - the rate of conversation of light energy to chemical energy (e.g biomass) by photosynthesis

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7
Q

What is net primary production?

A

NPP - the rate of chemical energy (e.g biomass) production after respiration has been subtracted

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8
Q

Npp = ?

A

GPP minus respiration

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9
Q

Forest standing stock is typically greater than grassland standing stock however…

A

NPP of forests is typically smaller than NPP of grasslands

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10
Q

Rainforests =

A

High NPP

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11
Q

Oceans =

A

Low NPP

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12
Q

Coral reefs =

A

high NPP

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13
Q

Deserts =

A

Low NPP

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14
Q

Contributions to global NPP

A

Rainforests and oceans = large
Deserts and coral reefs = small

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15
Q

What is primary production in aquatic ecosystems limited by?

A

Light and nutrients

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16
Q

Light availability limits what?

A

Production to surface waters in freshwater and marine ecosystems

17
Q

Geographic variation in primary production is largely shaped by nutrients:

A
  • iron availability in central ocean gyres
  • Nitrogen limitation in marine costal waters
  • Phosphate limitation in freshwater
18
Q

Large scales, primary production is driven mostly nay what?

A

Climate - highest productivity in areas that are warm and wet (higher NPP)

19
Q

On regional and local scales, production constrained by what?

A

Nutrient availability

Ecology and Conservation (26 decks)

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