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Table 7.10: Trophic (nutrient) state, catchment status and water quality of 177 New Zealand lakes.
| Oligotrophic lakes (low nutrient levels) | Mesotrophic lakes (moderate nutrient levels) | Eutrophic lakes (high nutrientlevels) | Hypertrophic lakes (very high nutrients) | |
|---|---|---|---|---|
| Number in sample | 63 | 43 | 39 | 32 |
| Percent of sample | 36% | 24% | 22% | 18% |
| % in North Island | 14% | 72% | 90% | 94% |
| % in South Island | 86% | 28% | 10% | 6% |
| % of lakes in pasture-dominant catchments | 6% | 35% | 66% | 92% |
| Phytoplankton biomass as chlorophyll a (mg/m3 ) | less than 2 | 2-5 | 5-30 | more than 30 |
| Water clarity (metres) | more than 10 | 5-10 | 1.5-5 | less than 1.5 |
| Oxygen status of bottom waters in summer | Well oxygenated | Moderately depleted | Depleted | Severely depleted |
| Total phosphorus (mg/m3) | less than 10 | 10-20 | 20-50 | more than 50 |
| Total nitrogen (mg/m3) | less than 200 | 200-300 | 300-500 | more than 500 |
Adapted from Smith et al. (1993)
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