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How do alien species affect ecosystems? How might alien plants and animals influence evolutionary differentiation? Why is understanding diversity and species richness so challenging for ecologists?

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Deanna Hettinger
Deanna HettingerLv2
28 Sep 2019

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Related questions

Why do humans have a greater affect on ecosystems than other animals? What are some ways that we might be able to retard habitat destruction? What are the challenges associated with them?

In 200-300 words.

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)

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