ECOSYSTEM PRODUCTIVITY
The Productivity of an ecosystem refers to the rate of production, i.e. the amount of organic matter accumulated per unit area in unit time. It is of following types
Gross Primary Productivity (GPP) It is minus energy utilized in respiration.
NPP = GPP - R
Net Primary Productivity (NPP) It is the amount of chemical energy that is generated by primary producers in a given period of time. It is also defined as the rate of production of organic matter. NPP is the available biomass for consumption to heterotrophs.
Secondary Productivity (SP) It is the rate of energy storage at consumer level.
Net Productivity (NP) It is the rate of storage of organic matter not used by the heterotrophs or consumers.
Ecological Niche
It is the role, position a species has in its environment. A species niche includes all of its interaction with biotic and abiotic factors of its environment.
Ecological Succession
It is a natural process by which different groups or communities colonize the same area over a period of time in a definite sequence. It can also be defined as a series of stages one after the other, by which a group of organisms living in a community reaches its final stable state or climax.
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