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Gross primary production (GPP) is the amount of chemical energy, typically expressed as carbon biomass, that primary producers create in a given length of time.Some fraction of this fixed energy is used by primary producers for cellular respiration and maintenance of existing tissues (i.e., "growth respiration" and "maintenance respiration").
The organisms responsible for primary production are called primary producers or autotrophs. Most marine primary production is generated by a diverse collection of marine microorganisms called algae and cyanobacteria. Together these form the principal primary producers at the base of the ocean food chain and produce half of the world's oxygen ...
The primary sector of the economy includes any industry involved in the extraction and production of raw materials, such as farming, logging, fishing, forestry and mining. [ 1 ] [ 2 ] [ 3 ] The primary sector tends to make up a larger portion of the economy in developing countries than it does in developed countries .
In a bottom-up cascade, the population of primary producers will always control the increase/decrease of the energy in the higher trophic levels. Primary producers are plants, phytoplankton and zooplankton that require photosynthesis. Although light is important, primary producer populations are altered by the amount of nutrients in the system.
While the equity market gets high off the fumes of Alcoa's optimistic outlook, another industrial bellwether is still reeling from the impact of some noteworthy market softness during its fiscal ...
Fate of mangrove primary production. A producer is any organism that performs photosynthesis. [9] Producers are important because they convert energy from the sun into a storable and usable chemical form of energy, glucose, [1] as well as oxygen. The producers themselves can use the energy stored in glucose to perform cellular respiration.
Why top producers on the international series scene come back to Spain is little mystery at all: Among the big reasons are crews, locations and service companies.
The factors are also frequently labeled "producer goods or services" to distinguish them from the goods or services purchased by consumers, which are frequently labeled "consumer goods". [2] There are two types of factors: primary and secondary. The previously mentioned primary factors are land, labour and capital.