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OCN 201 Twelfth Quiz Questions

Biological Productivity in the Ocean II

Pinet - Chapter 10

10-2 General Marine Productivity (p. 353)

Primary Production in the Ocean

1. Define primary productivity.

2. List the primary and secondary factors the limit primary productivity.

Solar Radiation

3. How much of the incoming solar radiation is used by phytoplankton to create organic matter?

4. Define net primary production. (Also see p. 633)

5. Define compensation depth.

6. Explain why the compensation depth generally is deeper in the open ocean compared to coastal oceans.

7. Give the compensation depth in the open ocean.

Nutrient Concentrations

8. Define macronutrients and give several examples. (Also see p. 632)

9. Define micronutrients and give several examples. (Also see p. 632)

10. Give the relative amounts of C, N, and P consumed during primary production.

11. Explain why in most instances C is not a limiting factor in primary production.

12. List the three primary (bio)limiting nutrients.

13. List the primary N and P species used during photosynthesis.

14. Explain why N tends to be the primary limiting nutrients in marine habitats.

Upwelling and Turbulence

15. Explain the importance of upwelling and turbulence for primary production.


16. Explain how grazing by herbivorous zooplankton can affect the growth rate of a phytoplankton bloom or cause it to end.

17. How is the population of zooplankters affected by the end of a phytoplankton bloom?

Water Turbidity

18. Explain why nutrient-rich coastal waters sometimes have reduced rates of primary production. (Also see fig. 10-9)

Variations in Productivity

19. Explain why the tropical oceans have very low rates of primary productivity despite the abundance of solar radiation. (Also see fig. 10-10a)

20. List three types of regions in the tropical oceans that have high rates of primary productivity.

21. Explain why primary production is low in the temperate regions during winter, despite the high nutrient concentrations that result from storm-related turbulence.

22. Explain the cause of the large spring diatom blooms in the temperate regions. (Also see fig. 10-10b)

23. Explain why the bloom stops in midsummer in the temperate regions. (Also see fig. 10-10b)

24. Explain the small spike in primary production in the early fall for the temperate regions. (Also see fig. 10-10b)

25. Explain why the polar oceans have very low primary production for most of the year. (Also see fig. 10-10c)

26. Explain the intense productivity of the polar ocean in the short summer months.