a

b

c

d

e

f

g

h

i

j

k

l

m

n

o

p

q

r

s

t

u

v

w

x

y

z

NET PRIMARY PRODUCTION (NPP)

Definition

The production of new organic matter by autotrophs, such as photosynthetic algae. This is very often the first step in a food chain. The total amount of organic matter produced per unit time by an individual, a population, an area or a water volume, is termed the gross primary production. When simultaneous losses of organic matter by catabolism (e.g. respiration) are subtracted from the gross primary production, a measure of net primary production is obtained. For photosynthetic algae, gross and net primary production are estimated by the light and dark bottle method.

English French Spanish Greek Norwegian Polish Hungarian Turkish Galician