| 11. | It is thus a major sink for "'fixed "'nitrogen and so limits oceanic primary productivity.
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| 12. | These include primary productivity ( production of trophic interactions.
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| 13. | The fern is a keystone species in Hawaiian ecosystems, and primary productivity in some areas.
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| 14. | Changes in the temperature ranges will also change the location of areas with high primary productivity.
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| 15. | Net primary productivity ( NPP ) is the primary measure of biomass accumulation within an ecosystem.
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| 16. | This may affect regional temperatures and primary productivity.
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| 17. | Only if the concentration is extreme will it decrease the light level sufficiently for impacting primary productivity.
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| 18. | Freshwater influences primary productivity in two ways.
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| 19. | An oligotrophic lake is a lake with low primary productivity, as a result of low nutrient content.
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| 20. | Heavily shaded pools have colder water, where as lightly shaded pools have increased levels of primary productivity.
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