Energy Flows Flashcards
In each location, NPP determines what?
how much energy is available to higher trophic levels
What are global patterns in aquatic NPP associated with?
nutrient availability, as well as the presence of nutrient pollution
What are global patterns in terrestrial NPP associated with?
with biomes and abiotic conditions
Trophic pyramids
help us visualize the amount of energy and biomass available in an ecosystem
Where is there more energy in terrestrial ecosystems?
energy & biomass: primary producer level
Where is there more energy in aquatic ecosystems?
energy: primary producer level
biomass: tertiary consumer level
How do we measure the amount of energy available to primary consumers in an ecosystem?
A. Gross Primary Productivity
B. Net Primary Productivity
C. Respiration Rate
D. A & B
B. Net Primary Productivity
Efficiency of energy transfer
not all energy at the primary producer level is transferred to primary consumers, and not all energy at the primnary consumer level is transferred to secondary consumers…and so on
Why is all energy not transferred?
-consumers cannot physically consume some parts of prey
-do not digest all energy…some lost as waste (assimilate)
-lost due to respiration
Consumption efficiency formula
Consumed energy / energy present in next lower trophic level
Assimilation efficiency formula
Assimilated energy / consumed energy
Net secondary productivity formula
assimilated energy - respiration rate
Net secondary productivity best
represents:
a. The amount of energy available to primary producers
b. The amount of energy available in primary consumers
c. The amount of energy available to secondary consumers
d. A & B
e. B & C
e. B & C
How many J/m/yr of net
primary productivity are
needed for a vegetarian to
acquire 100 J of energy?
A. 10 J
B. 100 J
C. 1000 J
D. 10000 J
C. 1000 J
How many J of net primary
productivity are needed for a
meat-eater to acquire 100 J
of energy?
A. 10 J
B. 100 J
C. 1000 J
D. 10000 J
C. 1000 J
