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Estuarine Vegetation Survey Manaia Harbour

TR 2008/44

Report: TR 2008/44
Author: Meg Graeme (Natural Solutions: Marine and Terrestrial Ecologists Ltd)


A 1997 pilot study of Whangamata, Wharekawa and Otahu estuaries determined that it is feasible to map vascular estuarine vegetation from aerial photography together with field surveys.  The success of this work encouraged Environment Waikato to continue with this method.  The estuarine vegetation of Tairua, Coromandel, Te Kouma, Manaia, Whitianga Port Waikato, Raglan, Aotea, Kawhia harbours and the inner Firth of Thames have since been surveyed and mapped.   Of these harbours, Whangamata, Otahu, Tairua and Wharekawa have recently been re-surveyed to determine changes in vegetation communities over time.

The mapped vegetation is in the Coastal Marine Area (CMA) and includes the spatial cover of mangrove, seagrass, sea meadow, and saltmarsh communities.  The results of the estuarine surveys are included in Environment Waikato’s Global Information System (GIS) database, and are used for State of the Environment investigations and assessing consent applications that may affect estuarine vegetation.

This report details the results from a re-survey of estuarine vegetation in the Manaia Harbour.  Comments are included on the threats to estuarine vegetation, and other field notes of interest.  This report is accompanied by digitised aerial maps of the survey site with vegetation community overlays. 

Estuarine Vegetation Survey Manaia Harbour
(858 kb, 122 seconds to download, 56k modem)

Table of contents

1 Introduction 1
2 Methodology 1
2.1 Wetland vegetation classification 1
3 Field notes 2
3.1 Summary 2
3.2 Site descriptions 5
3.3 Threats 29
3.4 Birds 30
4 Discussion and recommendations 30
  Bibliography 32
  Appendix 1 - GPS locations of figures 33