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Bias trumps science

05/10/2018

Homepaddock

There’s mixed news in Land, Air Water, Aotearoa (LAWA)’s 10-year trends report which was released yesterday:

. . .LAWA River Water Quality Lead Dr Tim Davie said the 10-year trends released today show the complexity of freshwater ecosystems.

“Looking at the trends, we see a mixed bag of improving and degrading sites across all water quality parameters. At the national level, for every parameter there are more sites showing signs of getting better than getting worse, except for the MCI trend which shows 2 out of 5 monitored sites are likely or very likely degrading,” said Dr Davie.

The MCI is used by scientists to monitor changes in macroinvertebrate populations because macroinvertebrates are responsive to multiple environmental changes such as flow, habitat, temperature, water quality and sediment. Macroinvertebrates are small animals (e.g. insects, worms, and snails) that live on or just below the stream-bed and are an important food source for…

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