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Trophic (nutrient) level trends

Trends in trophic level of 49 monitored lakes, 1990–2006

The bar graph shows the numbers of 49 monitored lakes that are either deteriorating, not changing or improving over time.

Tropic level trends of 49 lakes

Low nutrients
(Oligotrophic/ Microtrophic)

Moderate nutrients
(Eutrophic/ Mesotrophic)

High nutrients
(Supertrophic/ Hypertrophic)

Deterioration

1

6

3

No Change

9

13

11

Improvement

0

4

2

Data source: Ministry for the Environment.

 

This information has come from the latest state of the environment report, Environment New Zealand 2007.

Return to the trophic level index for lakes page

Last updated: December 2007