Ecosystems Reading: Freeman Chapter 54 An ecosystem is the unit composed of all the living things in a single place at a given time, in addition to , the important non-living components of the system.
Reading: Freeman Chapter 54
Pyramid of biomass for a pond. (Source: Data from Whittaker, R.H. 1961. Experiments with radiophosphorus tracer in aquarium microcosms. Ecological Monographs 31:157-188).
Productivity is high in areas of oceanic upwelling-oceanic producers, which include diatoms, dinoflagellates, cryptomonads, and other algae-require nutrients