Dominance in Marine Ecosystems

Abstract
The hypothesis that species-rich communities have more equal distributions of relative abundance than species-poor communites (MacArthur 1969) was tested with data from quantitative samples of marine [macrofauna and flora] communities. The opposite apparently is true and there is a significant tendency for numerical dominance of common species to be greater in species-rich than species-poor communities. Dominance-weighted diversity indices, which are postulated on a negative correlation between species richness and dominance, should thus be cautiously interpreted.