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Lake Taupō long-term monitoring programme 2011-2012

TR 2013/23

Report: TR 2013/23

Author: Dr M Gibbs (NIWA)

Abstract

A long term monitoring programme of Lake Taupō’s water quality was commissioned by Waikato Regional Council in October 1994 in the expectation that the trophic state of the lake would change to reflect changes in land use within the lake's catchment. This programme is conducted by NIWA with field assistance from the Department of Internal Affairs, Taupō Harbourmaster’s Office.

This report presents data from the routine mid-lake monitoring station from August 2011 to July 2012. Additional information for water clarity, temperature, and chlorophyll a collected between August 2012 and the time of writing this report has also been included in the data sets in the appendices.

Lake Taupō long-term monitoring programme 2011-2012 [PDF, 4.6 MB]

Contents
1 Executive summary 5
2 Introduction 9
3 Methods 11
3.1 Report contents 11
3.2 Statistical evaluation 12
3.3 "TREND" definition 12
4 Results and discussion 13
4.1 Temperature and dissolved oxygen 13
4.2 VHOD rate 15
4.3 Secchi depth 19
4.4 Phytoplankton 21
4.5 Deep clorophyll maxima 23
4.6 Algal species abundance 26
4.7 Nutrients in the upper waters 26
4.8 Nutrient accumulation in the hypolimnion 29
4.9 Total mass accumulated 30
4.10 Net accumulation rate 31
4.11 Total N 33
5 Knowledge gaps 34
6 Summary 36
7 Acknowledgements 39
8 Glossary of abbreviations and terms 41
9 References 43
  Appendix 1: Site map, sampling strategy and methods 45
  Appendix 2: The calculation of VHOD rates 51
  Appendix 3: Temperature and dissolved oxygen data 55
  Appendix 4: Nutrient data 80
  Appendix 5: Phytoplankton data 111
  Appendix 6: Historical data 135