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

River and stream water quality and ecology in the Wellington region: State and trends
Periphyton
Summary of Spearman Rank results for five periphyton metrics assessed at 46 RSoE sites
with hard substrate (2004–2011, n=8 1 ). rs=Spearman correlation co-efficient. p-values in
italics indicate ‘possible’ trends, while values in bold indicate ‘probable’ trends and values
that are bold and underlined indicate ‘clear’ trends (refer to Section 5.2 for further details)
Streambed cover Biomass
Site
no.
Site name
Mean mat Max mat
Mean
filamentous
Max
filamentous
Chlorophyll
a
rs p rs . p rs p rs p rs p
RS03 Waitohu S at Forest Pk -0.317 0.423 -0.122 0.749 0.051 0.885 0.051 0.885 -0.833 0.005
RS05 Otaki R at Pukehinau 0.518 0.160 0.518 0.160 0.464 0.233 0.464 0.233 -0.024 0.931
RS06 Otaki R at Mouth -0.190 0.619 -0.095 0.794 0.738 0.029 0.667 0.059 -0.405 0.290
RS09 Waikanae R at Mangaone Walkway -0.247 0.537 -0.247 0.537 -0.247 0.537 -0.247 0.537 -0.524 0.160
RS10 Waikanae R at Greenaway Rd 0.310 0.423 0.238 0.537 -0.071 0.839 0.000 0.977 -0.381 0.321
RS11 Whareroa S at Waterfall Rd -0.355 0.353 -0.355 0.353 -0.136 0.705 -0.136 0.705 0.238 0.537
RS13 Horokiri S at Snodgrass -0.675 0.059 -0.374 0.321 0.095 0.794 0.238 0.537 0.667 0.059
RS14 Pauatahanui S at Elmwood Br – – – – 0.805 0.010 0.781 0.015 0.452 0.233
RS15 Porirua S at Glenside -0.262 0.498 -0.359 0.353 0.671 0.059 0.671 0.059 0.571 0.120
RS16 Porirua S at Wall Park (Milk Depot) 0.098 0.794 0.098 0.794 0.833 0.005 0.833 0.005 0.452 0.233
RS17 Makara S at Kennels -0.406 0.290 -0.406 0.290 0.073 0.839 0.061 0.839 0.119 0.749
RS18 Karori S at Makara Peak -0.048 0.885 -0.096 0.794 0.619 0.086 0.667 0.059 -0.190 0.619
RS19 Kaiwharawhara S at Ngaio Gorge -0.286 0.460 -0.190 0.619 0.714 0.037 0.874 0.000 0.238 0.537
RS20 Hutt R at Te Marua Intake Site -0.247 0.537 -0.247 0.537 -0.247 0.537 -0.247 0.537 0.000 0.977
RS21 Hutt R opp. Manor Park G.C. 0.802 0.010 0.874 0.000 0.690 0.047 0.651 0.072 0.357 0.353
RS22 Hutt R at Boulcott 0.994 0.000 0.922 0.000 0.635 0.072 0.491 0.182 0.381 0.321
RS23 Pakuratahi R 50m d/s Farm Ck 0.738 0.029 0.683 0.047 -0.244 0.537 -0.342 0.387 -0.024 0.931
RS24 Mangaroa R at Te Marua 0.714 0.037 0.524 0.160 0.395 0.290 0.539 0.139 0.905 0.000
RS25 Akatarawa R at Hutt R confl. 0.381 0.321 0.319 0.423 -0.265 0.498 -0.265 0.498 0.381 0.321
RS26 Whakatikei R at Riverstone 0.371 0.321 0.371 0.321 0.000 0.977 -0.024 0.931 0.167 0.662
RS28 Wainuiomata R at Manuka Track -0.466 0.207 -0.401 0.290 -0.483 0.207 -0.483 0.207 -0.238 0.537
RS29 Wainuiomata R u/s of White Br 0.488 0.207 0.512 0.160 -0.548 0.139 -0.667 0.059 0.905 0.000
RS30 Orongorongo R at Orongorongo Stn 0.748 0.029 0.647 0.072 0.714 0.037 0.755 0.021 0.167 0.662
RS31 Ruamahanga R at McLays 0.047 0.885 0.047 0.885 0.136 0.705 0.136 0.705 -0.500 0.182
RS32 Ruamahanga R at Te Ore Ore -0.072 0.839 -0.072 0.839 0.262 0.498 0.096 0.794 0.452 0.233
RS33 Ruamahanga R at Gladstone Br 0.268 0.498 0.268 0.498 0.561 0.120 0.561 0.120 0.786 0.015
RS34 Ruamahanga R at Pukio -0.247 0.537 -0.247 0.537 0.359 0.353 0.359 0.353 0.333 0.387
RS35 Mataikona Trib at Sugar Loaf Rd -0.136 0.705 -0.136 0.705 -0.204 0.578 -0.180 0.619 0.667 0.059
RS37 Taueru R at Gladstone -0.024 0.931 0.072 0.839 0.714 0.037 0.732 0.029 0.667 0.059
RS38 Kopuaranga R at Stewarts 0.357 0.353 -0.190 0.619 0.500 0.182 0.755 0.021 0.667 0.059
RS40 Waipoua R at Colombo Rd Br 0.619 0.086 0.619 0.086 0.762 0.021 0.690 0.047 0.405 0.290
RS41 Waingawa R at South Rd 0.464 0.233 0.464 0.233 0.390 0.321 0.390 0.321 0.262 0.498
RS43 Motuwaireka S at Headwaters -0.016 0.931 -0.016 0.931 -0.533 0.160 -0.507 0.182 -0.381 0.321
RS44 Totara S at Stronvar -0.095 0.794 0.108 0.749 0.619 0.086 0.714 0.037 0.119 0.749
RS45 Parkvale Trib at Lowes Reserve 0.083 0.839 0.083 0.839 – – – – 0.238 0.537
RS46 Parkvale S at Weir 0.539 0.139 0.563 0.120 0.286 0.460 0.238 0.537 0.167 0.662
RS47 Waiohine R at Gorge 0.089 0.794 0.190 0.619 -0.439 0.260 -0.390 0.321 -0.381 0.321
RS48 Waiohine R at Bicknells 0.764 0.021 0.764 0.021 0.366 0.353 0.171 0.662 0.524 0.160
RS49 Beef Ck at Headwaters 0.439 0.260 0.439 0.260 -0.464 0.233 -0.464 0.233 0.548 0.139
RS50 Mangatarere S at SH 2 0.500 0.182 0.335 0.387 0.548 0.139 0.524 0.160 0.143 0.705
RS51 Huangarua R at Ponatahi Br 0.714 0.037 0.500 0.182 0.667 0.059 0.810 0.010 0.524 0.160
RS52 Tauanui R at Whakatomotomo Rd 0.327 0.387 0.327 0.387 -0.024 0.931 0.119 0.749 -0.024 0.931
RS53 Awhea R at Tora Rd -0.371 0.321 -0.371 0.321 0.905 0.000 0.791 0.015 0.333 0.387
RS54 Coles Ck Trib at Lagoon Hill Rd -0.600 0.102 -0.600 0.102 0.548 0.139 0.190 0.619 0.595 0.102
RS55 Tauherenikau R at Websters -0.405 0.290 -0.405 0.290 0.778 0.015 0.651 0.072 0.000 0.977
RS56 Waiorongomai R at Forest Pk – – – – -0.527 0.160 -0.527 0.160 -0.571 0.120
1n=7 for periphyton biomass at the three Hutt River sites (the 2011 biomass results were excluded due to the influence of a fresh).
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