A dominant species that constitutes a large
proportion of the biomass and which affects
many other species
A species which makes up only a small
proportion of the total biomass of a
community, yet has a huge impact on the
community's organization and survival
A common species that has plenty of
biomass, yet has a fairly low impact on the
community's organization
A rare species that has minimal impact on
the biomass and on other species in the
community
