Trophic level index (TLI)
Purpose of monitoring
Table 1. Lake TLI unit values and long term trend.
* Long term trends starting point is year 1900
Source: Bay of Plenty Regional Council, 2011
Figure 1. Lake types according to TLI values.
- Lake Okaro shows improvement
- Lakes Okareka and Tarawera show no change
- Lakes Tikitapu and Okataina show possible degradation
- Lake Rotokakahi shows some degradation
Further information sources