Before revision: + Relationships between Trophic State Index, chlorophyll, phosphorus, Secchi depth, and trophic class (after Carlson 1996)Trophic State IndexChlorophyll (µg/L)Phosphorus (µg/L)Secchi depthTrophic Class< 30—400—2.60—12> 8—4Oligotrophic or hipotrophic40—502.6—7.312—244—2Mesotrophic50—707.3—5624—962—0.5Eutrophic70—100+56—155+96—384+0.5— < 0.25Hypertrophic Oligotrophic lakes generally host very little or no aquatic vegetation and are relatively clear, while eutrophic lakes tend to host large quantities of organisms, including algal blooms.
After revision: + Relationships between Trophic State Index, chlorophyll, phosphorus, Secchi depth, and trophic class (after Carlson 1996)Trophic State IndexChlorophyll (µg/L)Phosphorus (µg/L)Secchi depth (m)Trophic Class< 30—400—2.60—12> 8—4Oligotrophic or hipotrophic40—502.6—7.312—244—2Mesotrophic50—707.3—5624—962—0.5Eutrophic70—100+56—155+96—384+0.5— < 0.25Hypertrophic Oligotrophic lakes generally host very little or no aquatic vegetation and are relatively clear, while eutrophic lakes tend to host large quantities of organisms, including algal blooms.