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How does one measure marine primary productivity in the the geologic record? It is difficult to do directly, but one indirect way is to look at metrics regarding the organisms that are primary consumers, those that rely directly on consuming plankton, marine algae, kelp, and other important primary producers in the oceanic realm. One can infer that a high abundance of filter-feeding, primary consumer organisms would suggest a high amount of primary producers to support that food web. [Source: Physorg.com]
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