Weed Control and Monitoring in Tuff Crater Reserve, North Shore, Auckland.

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  • Topic: Invasive species, Introduced species, Invasion biology terminology
  • Pages : 26 (5858 words )
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  • Published : September 2, 2010
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Weed Control and Monitoring in Tuff Crater Reserve, North Shore, Auckland.

Date: May 2010.

Table of Contents

1. Introduction4
2. Background4
2.1. Objectives4
2.2. Description of the Area5
2.3. Site Location8
2.4. Site Plan9
2.5. Plan of Management Unit 7.10
2.6. Incorporation of Relevant Statutory and Policy Documents10 3. Method12
3.1. Sampling Methods12
3.1.1. Plot Procedure12
3.1.2. Photo Point13
3.2. Controlling Methods13
3.2.1. Herbicides13
3.2.2. Manual Weed Control14
4. Result14
4.1. Result monitoring15
4.2. Outcome monitoring15
4.3. Graphs of the weed monitoring16
4.3.1. Graph of elaeagnus density in the plot area before the weed control16 4.3.2. Graph of elaeagnus density in the plot area after the weed control16 4.3.3. Graph of weed density in the plot area before the weed control17 4.3.4. Graph of weed density in the plot area after the weed control17 5. Conclusions18

6. Recommendations19
6.1. Approaches19
6.2. Data entry, verification and editing20
6.3. Recommendations for routine data summaries and statistical analyses to detect change.21 6.4. Recommended reporting schedule.21
7. Acknowledgements23
8. References23
9. Appendices26
Appendix 1: Weeds species observed on some of the transect lines at Tuff Crater on 1/05/2010.26 Appendix 2: Exotic species observed at Tuff Crater on November 2008 and classification under the RPMS 2007-2012 by abundance.28


The uniqueness of much of New Zealand’s indigenous biodiversity means that it cannot be conserved in nature elsewhere in the world. A sudden drastic change such as the introduction of alien plants will have a negative effect on natural ecosystems and biodiversity in New Zealand. Non-native invasive plant species are recognized worldwide as a threat to biological diversity, second only to direct habitat loss and fragmentation.

Auckland has been identified as the weediest city in New Zealand by the Auckland Regional Council. Tuff Crater is a narrow coastal reserve in North Shore, Auckland, which is heavily infested with weeds such as elaeagnus, pampas grass, tree privet, Chinese privet, gorse, moth plant, wattle and climbing asparagus.

This monitoring report provides information and procedures for monitoring the effectiveness of weed control work done in Tuff Crater during the second quarter of 2010. The goal of this report is to identify and monitor pest plants during a weed control programme conducted at Management Unit 7 of the reserve. Targeted application of herbicides and manual methods are the main approaches used.

Plot procedure 20 x 20m sampling method using line transects and quadrats were applied to record inventory populations of weeds located on site. Data entry involved transporting raw data from field sheets into an electronic form. Weeds such as elaeagnus which covered whole cliff sides of Management Unit 7 were successfully controlled using manual methods. The above monitoring helps to determine that the weed control methods used are effective to protect the native vegetation and habitats of indigenous species in the reserve.

It is recommended that introduced species diversity and abundance data are stored in a Geo-Spatial Database. This information could be used to observe trends, create data summaries and conduct statistical analyses to assist in the long-term plan to restore Tuff Crater to a self sustaining indigenous ecosystem.

1. Introduction

This report is an investigation into weed control and monitoring in Tuff Crater, North Shore, Auckland. It provides information, procedures and identifies the effectiveness of a weed-control programme, conducted by The Royal Forest and Bird Protection Society of New Zealand (Forest & Bird), North Shore. Forest & Bird is New Zealand’s largest independent conservation organisation that...
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