DraftD RANKING OF TOP WETLANDS IN THE NORTHLAND REGION STAGE 4 - RANKINGS FOR 304 WETLANDS MARCH 2011 Contract Report No. 2489 Prepared for: NORTHLAND REGIONAL COUNCIL PRIVATE BAG 9021 WHANGAREI WILDLAND CONSULTANTS LTD, 3 CARMONT PLACE, MT WELLINGTON, P.O. BOX 132-040, SLYVIA PARK, AUCKLAND Ph 09-276-7540; Fax 09-276-7541 HEAD OFFICE: 99 SALA STREET, P.O. BOX 7137, TE NGAE, ROTORUA Ph 07-343-9017; Fax 07-343-9018, email
[email protected], www.wildlands.co.nz © 2011 Contract Report No. 2489 CONTENTS 1. INTRODUCTION 1 2. CLASSIFICATION OF WETLAND TYPES 1 3. WEIGHTING OF RANKING CRITERIA 2 4. RANKING CRITERIA 3 4.1 Areal extent 3 4.2 Size contribution to wetlands within the ecological district 3 4.3 LENZ threat category 4 4.4 Representativeness 4 4.5 Vegetation diversity and pattern 5 4.6 Hydrological integrity and water quality 5 4.7 Threatened, at risk, and regionally significant species 5 4.8 Dominance of indigenous plants in the upper-most vegetation layer 6 5. DRAFT RANKINGS 7 5.1 Overview 7 5.2 Freshwater wetlands 9 5.3 Estuarine wetlands 9 5.4 Top freshwater wetlands by type 9 5.4.1 Bogs 11 5.4.2 Ephemeral 11 5.4.3 Lacustrine 11 5.4.4 Pahiki and gumland 11 5.4.5 Swamps 12 5.4.6 Fens 12 5.4.7 Geothermal wetlands 12 5.5 Top wetlands by ecological district 12 5.6 Top freshwater wetlands on dunes 16 6. SUMMARY AND CONCLUSIONS 17 ACKNOWLEDGMENTS 18 REFERENCES 18 APPENDICES 1.