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32 Cards in this Set
- Front
- Back
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ecosystem consist of
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all organisms living in a community and abiotic factors (climate, nutrient cycling)
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Ecosystem Dynamics
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E flow
Nutrient Cycling |
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Physics controls
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E flow
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Chemistry dominates
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Nutrient cycling
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connect all trophic levels
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Decomposers
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amount of light energy converted to chemical E in an area
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primary productivity
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amount of photosynthesis is dependent on the amount of solar energy
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global E budget
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total amount of photosynthesis per area
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GPP
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GPP units are
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g glucose/ m2/ year
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GPP-Energy used by the plant for repiration
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NPP
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highly productive g/m2/year
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algea beds marsh, tropical rain forest
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Ocean (___%), tropical rainforest (__%) % of earth's net primary productivity
Terrestrial System |
24
22 |
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contributes to approx. 2/3 of the NPP
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terestral systems
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___ocean areas are more productive than equatorial
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N/S
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on the local scale a t is often the limiting factor
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soil nutrien(N and P)
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feedback between light energy and primary production
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negative
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In aquatic biomes ______ limit productivity more than ____
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Nutrients
light |
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trophic
levels is usually less than __% efficient |
20
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% of E energy
that is transformed into biomass (not used for respiration) |
production Effiecency
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% of production transferred from on trophic level to another usually ranges from __ % to ___ % with ___ as the average
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5- 20% with a 10% averagw
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illustrates the trophic efficiency
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Trophic pyramid
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_____are rare because there isn't much energy left for them
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Terticary
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some__have inverted biomass pyramids
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aquatic systems
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green world hypothosis
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Herbivores consume relatively little plants biomass because they're held in check by predators
called top down control |
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Beyond the green world
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Plants have defenses against herbivores
Nutrients- not E supply limit the herbivores interspecific, intraspecific, abiot |
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with in a species
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intraspecific
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biological and geochemical process more nutrients
between inorganic and organ parts |
biochemistry
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between species
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interspecific
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occur
in atmosphere and cycle globally |
C, N, S, N₂
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cycle
on the local level |
PO4,
K+, Ca2+- |
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can only happen in plants
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Assimilation-
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H₂O differs because
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does not change chemical properties
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