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22 Jan 2019

A keystone species affects relative abundance of species in a community at

the lowest trophic level
the trophic level immediately below it
all higher trophic levels
all but the uppermost trophic levels

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Nelly Stracke
Nelly StrackeLv2
24 Jan 2019

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Related questions

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)

Part A) Multiple choice

1. A_____ represents the flow of energy from one level to the next as a sequence where one organism being eaten by another .

A. network B.Trophic diagram C.Food Chain D.Food diagram

2. The persistence of Candida zemplinina in botrytized wine fermentation occurred because:

A. Saccharomyces preferentially uses glucose to avoid competition with the fermenting yeast

B. Saccharomyces preferentially uses fructose to avoid competition with the fermenting yeast

C. zemplinina preferentially uses glucose to avoid competition with the fermenting yeast

D. zemplinina preferentially uses fructose to avoid competition with tht fermenting yeast

3. The concept of _______________ suggests that predators can have a profound impact on species diversity in a community by keeping prey below their carrying capacity.

A. keystone species B.cornerstaone species C.food webs D. trophic networks

Choose one of the below.

Which of the following organisms would be easiest to place in asingle trophic level? AND WHY?

A. dinoflagellates that are photosynthetic andconsume bacteria

B. brown bears that eat salmon and berries

C. walleye pike that eat zooplankton when they aresmall and other fish species when they are large

D. the algae in lichen that participate in themutualistic interaction of fungis

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