Dominance
In each community, a few over topping species are present in greater bulk. By their greater number or biomass (living weight) the dominant species modify the habitat characteristic and influence the growth of other species in the community. In most communities only a single species, being particularly conspicuous, is dominant and in such case.the community is named after the dominant species, as for example spruce forest community. In some communities, however, there may be more than one dominant species, as in oak-fir forest in the west Himalayas.