Table 7: Changes in trophic state for each region
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| Regional council |
Declining quality |
No change |
Improving quality |
Total |
|---|---|---|---|---|
Auckland |
2 |
3 |
2 |
7 |
Bay of Plenty |
3 |
6 |
3 |
12 |
Canterbury |
8* |
12* |
20 |
|
Chatham Islands |
0 |
|||
Gisborne District |
0 |
|||
Greater Wellington |
1# |
1 |
||
Hawke's Bay |
0 |
|||
Manawatu-Wanganui |
0 |
|||
Northland |
3* |
6* |
3* |
12 |
Otago |
2 |
2 |
||
Southland |
3* |
3 |
||
Taranaki |
1 |
1 |
||
Tasman District |
0 |
|||
Waikato |
4* |
5 |
2* |
11 |
West Coast |
1 |
1 |
||
Total |
13 |
34 |
23 |
70 |
Total percentage |
19% |
48% |
33% |
Note: '*' indicates that the trend in one or more of the lakes was based on a change in trophic level compared with previous monitoring rather than on a comprehensive trend analysis such as described in Burns et al (2000).
# Greater Wellington Regional Council report that improvements in key water quality parameters are slight for this lake (Lake Wairarapa). Rates of changes in water quality parameters are slow and likely to have little biological significance.
