The trophic level index (TLI) is used in
New Zealand as a measure of nutrient status of lakes. It is similar to the
trophic state index but was proposed as alternative that suited New Zealand.
The system uses four criteria, phosphorus and nitrogen concentrations, as well as visual clarity and algal biomass weighted equally.
See also
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Water pollution in New Zealand
Water pollution in New Zealand is an increasing concern for those who use and care for waterways and for New Zealand regulatory bodies. An increase in population is linked to an increase in water pollution, due to a range of causes such as rural ...
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Lakes of New Zealand
There are 3,820 lakes in New Zealand that have a surface area larger than one hectare. Many of the lakes in the central North Island are volcanic crater lakes. The majority of the lakes near the Southern Alps / Kā Tiritiri o te Moana were carve ...
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Environment of New Zealand
External links
New Zealand Ministry for the Environment- Trophic Level Index for lakes
Definitions of the 5 trophic states - Oligotrophic, Mesotrophic, Eutrophic, Supertrophic and Hypertrophic lakes
References
Water in New Zealand
Water pollution
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