a) The amount a species yields, when grown with other species compared to yield in a monoculture.
b) The amount a biomass yields in an ecological community (e.g. a grassland patch), compared to any of its members alone.

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  • Ecological effects of biodiversity — The diversity of species and genes in ecological communities affects the functioning of these communities. These ecological effects of biodiversity in turn affect both climate change through enhanced greenhouse gases, aerosols and loss of land… …   Wikipedia

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