Secondary productivity is the rate of formation of new organic matter by consumers. Whether they are primary consumers or secondary consumers.
Here re-synthesis of organic matter by primary consumers is converting the plant matter into flesh,milk,etc(by herbivores) and to compost,simple organic matter(by decomposers). And re-synthesis by secondary consumers is converting the matter they consume(herbivore/carnivore animals) into the complex organic compounds/matter they produce. I.e. flesh,eggs,milk etc.
I've tried to explain in simple words.Hope this cleared you doubt.
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