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explain the difference between gross primary productivity and net primary productivity. Which is larger, and why? Why is total primary production always greater than total secondary production?


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Reid Wolff
Reid WolffLv2
28 Sep 2019

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Related questions

Net primary production closely equals:
a. ecosystem respiration
b. gross primary production
c. net secondary production
d. photosynthesis minus producer respiration

The tolerance model of succession differs from the facilitationand inhibition models in that:
a. early successional species have little effect on laterones
b. species have little effect on each other
c. later successional species outcompete early successionalones
d. early successional species outcompete later successionalones

1. What limits primary productivity?


2. What drives succession?

1) Explain why we typically find more species under conditions of intermediate disturbance compared to either rare or frequent disturbance. (Ch. 18)

2) Why might you expect communities with fewer species to contain fewer trophic levels? (Ch. 18)

3) How do ecologists distinguish between primary and secondary succession? (Ch. 19)

4) When using a chronosequence to document the pathway of succession, what are the assumptions? (Ch. 19)

5) Why should we not expect a single climax community within a biome? (Ch. 19)

6) Compare and contrast the concepts of facilitation, inhibition, and tolerance in the context of ecological succession. (Ch. 19)

7) When a community experiences succession, why does the species richness of a community initially increase, then plateau, and finally decline? (Ch. 19)

8) Why do early- and late-successional species tend to possess different adaptations? (Ch. 19)

9) Why is the efficiency of energy transfer between two trophic levels generally quite low? (Ch. 20)

10) How do ecologists distinguish between gross primary productivity and net primary productivity? (Ch. 20)

11) Compare and contrast the measurement of primary productivity in terrestrial vs. aquatic systems. (Ch. 20)

12) What factors limit the net primary productivity of terrestrial systems? (Ch. 20)

1: What do trophic relationships illustrate about an ecosystem?

2: About how much of the sun's energy is converted, captured, or fixed by primary producers?

3: Net Primary Production is always lower than Gross Primary Production. What happens to the difference?

4: Does energy flow through an ecosystem or is it recycled? Why?

5: How does climate determine the distribution of ecosystems?

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