River and stream water quality and ecology - Greater Wellington ...

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River and stream water quality and ecology in the Wellington region: State and trends Table 5.6: Summary of ‘probable’ (p
River and stream water quality and ecology in the Wellington region: State and trends Annual mean and maximum mat periphyton streambed cover (%) 100 90 80 70 60 50 40 30 20 10 RS21 annual maximum RS21 annual mean RS22 annual maximum RS22 annual mean 0 2004 2005 2006 2007 2008 2009 2010 2011 Figure 5.7: Annual mean and maximum mat periphyton streambed cover at Hutt River opposite Manor Park Golf Club (RS21) and Hutt River at Boulcott (RS22), based on monthly assessments undertaken over 2003/04 to 2010/11 (based on a July to June year). The horizontal red line indicates the MfE (2000) streambed cover guidelines for mat periphyton (60%) Clear trends were evident in periphyton biomass at four sites (Table 5.7): a decreasing trend at Waitohu Stream at Forest Park and increasing trends at Mangaroa River at Te Marua, Wainuiomata River upstream of White Bridge and Ruamahanga River at Gladstone (Figure 5.8). The three increasing trends ranged in magnitude from 9 to 18 mg/m 2 /yr, representing an increase of more than 20% per year relative to the mean periphyton biomass values. Exceedance of the MfE (2000) guideline for protection of aquatic biodiversity at all three sites and a corresponding decreasing trend in macroinvertebrate health at one site (Ruamahanga River at Gladstone, see Section 6.2.2) suggests that these increases in periphyton biomass may be ecologically significant. In contrast, the small magnitude of the decreasing trend at Waitohu Stream at Forest Park, a site with already low periphyton biomass, is unlikely to be ecologically significant. Table 5.7: Summary of ‘probable’ (p
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River and stream water quality and
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DISCLAIMER This report has been pre
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observed trends were unclear. The p
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5. Periphyton - state and trends 57
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Figure 2.1: RSoE monitoring sites a
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2.4.2 Biological variables River an
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Page 106 and 107: IBI Score 60 50 40 30 20 10 0 River
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Appendix 1: Monitoring site details
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