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Trends in nuisance periphyton cover at New Zealand National River Water Quality Network sites 1990-2006

• Executive Summary
• Introduction
• Methods
• Results
• Discussion
• Acknowledgements
• References
• Appendix 1. Summary of NRWQN periphyton assessment site locations, characteristics and constraints
• Appendix 2. Summary statistics for annual mean and maximum percentage cover by obvious periphyton mats and filamentous algae at 73 NRWQN sites for the period 1990-2006
• Appendix 3. Spearman rank (rs) correlations between year and annual means and maximums for periphyton as filamentous, mat and total obvious (i.e., filamentous + mat) cover

6. References

Ballantine, D.J.; Davies-Colley, R.J. (2009). Water quality trends at the NRWQN sites for the period 1989-2007. NIWA, Hamilton, Client Report HAM2009-026,39 p.

Benjamini, Y.; Hochberg, Y. (1995).  Controlling the false discovery rate: a practical and powerful approach to multiple testing.  Journal of the Royal Statistical Society 57 (1): 289-300.

Biggs, B.J.F. (2000). New Zealand periphyton guideline: detecting, monitoring and managing enrichment of streams. Ministry for the Environment, Wellington, 122 p.

Davies-Colley, R.J.; Hickey, C.W.; Quinn, J.M.; Ryan, P.A. (1992).  Effects of clay discharges on streams. 1. Optical properties and epilithon.  Hydrobiologia 248: 215-234.

Davies-Colley, R.J.; Nagels, J.W. (2008).  Predicting light penetration into river waters.  Journal of Geophysical Research - Biogeosciences 113: G03028, doi:03010.01029/02008JG000722.

Davies-Colley, R.J.; Quinn, J.M. (1998).  Stream lighting in five regions of North Island, New Zealand: control by channel size and riparian vegetation.  New Zealand Journal of Marine and Freshwater Research 32(4): 591-605.

Larned, S.T.; Scarsbrook, M.R.; Snelder, T.H.; Norton, N.J.; Biggs, B.J.F. (2004).  Water quality in low-elevation streams and rivers of New Zealand: recent state and trends in contracting land-cover classes.  New Zealand Journal of Marine and Freshwater Research 38: 347-366.

Ministry for the Environment (2007). Environment New Zealand 2007. Ministry for the Environment, Wellington, 456 p.

Quinn, J.M.; Cooper, A.B.; Stroud, M.J.; Burrell, G.P. (1997).  Shade effects on stream periphyton and invertebrates: an experiment in streamside channels.  New Zealand Journal of Marine and Freshwater Research 31(5): 665-683.

Scarsbrook, M.J. (2006). State and trends in the National River Water Quality Network (1989-2005). Ministry for the Environment, Wellington, 42 p.

Smith, D.G.; McBride, G.B.; Bryers, G.G.; Davies-Colley, R.J.; Quinn, J.M.; Vant, W.N. (1989). A national water quality monitoring network for New Zealand. Water Quality Centre, Hamilton, Consultancy Report No.8016/2, 147 p.

Welch, E.B.; Quinn, J.M.; Hickey, C.W. (1992).  Periphyton biomass related to point-source nutrient enrichment in seven New Zealand streams.  Water Research 26(5): 669-675.

Zar, J.H. (1984). Biostatistical analysis. 2nd.  Prentice Hall, Englewood Cliffs, New Jersey. 718 p.

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