Biomass
Biomass is the mass of living biological organisms in a given area or ecosystem at a given time. Biomass can refer to species biomass, which is the mass of one or more species, or to community biomass, which is the mass of all species in the community. (Ricklefs & Miller, 2000)
Sources
Ricklefs, R. E., & Miller, G. L. 2000. Ecology (4th ed.). Macmillan. p. 192. ISBN 978-0-7167-2829-0.