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Lake Taupo long-term monitoring programme 2006-2007

TR 2008/25

Report: TR08/25

Author: Max Gibbs, NIWA

Abstract

With the expectation that the trophic status of Lake Taupo will slowly change to reflect changes in land use within the lake's catchments, a long term programme monitoring the lake's water quality was commissioned by Environment Waikato. This programme commenced in October 1994 and is conducted by NIWA with field assistance from the Department of Internal Affairs, Taupo Harbourmaster’s Office.

Lake Taupo long-term monitoring programme 2006-2007 [PDF, 568 KB]

Contents
  Executive Summary iv
  Glossary 1
1. Introduction 2
2. Methods 4
2.1 Report contents 5
2.2 Statistical evaluation 5
2.3 “TREND” definition 5
3. Results and discussion 7
3.1 Temperature and dissolved oxygen 7
3.2 VHOD rate 8
3.3 Secchi depth 10
3.4 Phytoplankton 11
3.5 Species abundance 14
3.6 Nutrients in the upper waters 14
3.7 Nutrient accumulation in the hypolimnion 16
3.7.1 Total mass accumulated 16
3.7.2 Net accumulation rate 18
3.7.3 Total N 20
4. Knowledge gaps 22
5. Summary 23
6. Acknowledgments 26
7. References 27
8. Appendix 1. Site map, sampling strategy and methods 29
8.1 Methods 30
8.2 Data handling and less than detection limit values 31
8.3 Statistical methods 33
9. Appendix 2. The calculation of net VHOD rates 35
10. Appendix 3. Temperature and dissolved Oxygen data 39
11. Appendix 4. Nutrient data 59
12. Appendix 5. Phytoplankton data 82
13. Appendix 6. Historical data 86