Biological productivity | Wikipedia audio article
Channel: wikipedia tts
Date: 02/05/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Productivity_(ecology)


00:00:31 1 Primary production
00:00:56 2 Secondary production
00:02:05 3 See also



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SUMMARY
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In ecology, productivity refers to the rate of generation of biomass in an ecosystem.  It is usually expressed in units of mass per unit surface (or volume) per unit time, for instance grams per square metre per day (g m−2 d−1).  The mass unit may relate to dry matter or to the mass of carbon generated.  Productivity of autotrophs such as plants is called primary productivity, while that of heterotrophs such as animals is called secondary productivity.