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Intertidal Life Around the Waitakere Ranges

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Intertidal Life Around the Waitakere Ranges Intertidal Life Around the Coast of the Waitakere Ranges, Auckland January 2004 Technical Publication 298 The views expressed in this report are those of the authors and do not necessarily reflect those of the Auckland Regional Council Auckland Regional Council Technical Publication No. 298, January 2004 ISSN 1175–205X ISBN 1–877353–14–0 Printed on recycled paper www.arc.govt.nz i ii INTERTIDAL LIFE AROUND THE COAST OF THE WAITAKERE RANGES, AUCKLAND by Bruce W. Hayward1 and Margaret S. Morley2 1c/o Geomarine Research, 40 Swainston Rd, St Johns, Auckland 2c/o Auckland War Memorial Museum Prepared for Auckland Regional Council 2002 The views expressed in this report are those of the authors and do not necessarily reflect those of the Auckland Regional Council iii iv Foreword: Why is Auckland Regional Council publishing this Report? The Auckland Regional Council was given the opportunity to publish this report on the intertidal plants and animals of the Waitakere Ranges Coast by Bruce Hayward and Margaret Morley. The report is the result of a considerable amount of effort on the part of the authors and a wider group of participants and contributors during field-work, taxonomic identification, analysis and presentation of the information. The report presents the findings of this body of work accompanied by comprehensive species and habitat lists, coupled with an extensive array of handsome figures, illustrations and maps. The Council considers that the report provides a valuable information resource for those interested in Auckland's coastal ecology and biodiversity. The Council greatly appreciated the opportunity to make this valuable body of work available to the community through contribution of only the comparatively minor costs of formatting and printing. Objective findings versus subjective viewpoint. The bulk of the report presents objective findings of the survey work. However, it also includes several sections where the authors’ present their personal views on how the information can be used to identify areas they believe are deserving of protection for biodiversity and educational values. It should be recognized that the views on the appropriate level of protection, and where along the Waitakere Ranges coast this should be applied, do not necessarily reflect those of the Auckland Regional Council. The authors’ views remain in the report to provide a useful platform for continued discussion and debate by the many parties interested in the ecological future of this special coastal area. v vi CONTENTS page FOREWORD …………………………………………………………………………….. v 1. SUMMARY………………………………………………………………………………. 1 2. INTRODUCTION ………………………………………………………………………… 3 2.1 STUDY AREA 3 2.2 PREVIOUS WORK ……………………………………………………………… 3 2.3 SURVEY METHODS 4 2.4 TRANSECT METHODS ……………………………………………………………… 4 2.5 BIODIVERSITY AND SPECIMENS 4 3. INTERTIDAL COMMUNITIES ……………………………………………………………… 5 3.1 EXPOSED WEST COAST ROCKY SHORES 5 3.2 EXPOSED WEST COAST COBBLE BEACHES ……………………………… 5 3.3 SHELTERED NORTH MANUKAU HARBOUR ROCKY SHORES 6 3.4 SHELTERED NORTH MANUKAU HARBOUR BOULDER BEACHES ………… 6 3.5 EXPOSED WEST COAST SANDY BEACHES 7 3.6 SHELTERED NORTH MANUKAU HARBOUR SANDY AND MUDDY SHORES ….. 7 3.7 ESTUARIES 7 3.8 SALT MARSH AND SALT MEADOW ………………………………………… 8 3.9 MANGROVE FOREST 8 3.10 EXPOSED WEST COAST SUBTIDAL WASH-UP ……………………………… 8 3.10.1 Pelagic 8 3.10.2 Subtidal surf zone …………………………………………………… 9 3.10.3 Offshore subtidal sediment substrates 9 3.10.4 Subtidal and intertidal exposed rocky shores …………………… 9 3.10.5 Harbour soft sediment substrates 9 3.10.6 Reworked fossils 9 3.11 SHELTERED NORTH MANUKAU HARBOUR SUBTIDAL WASH-UP ………… 9 4. ROCKY SHORE ZONATION ……………………………………………………………… 11 4.1 PERIWINKLE ZONE 11 4.2 BARNACLE ZONE ……………………………………………………………… 11 4.3 MUSSEL, TUBE WORM AND CORALLINE PAINT ZONE 11 4.4 SUBTIDAL FRINGE SEAWEED ZONE ………………………………………… 12 5. SPECIES HABITAT AND OCCURRENCE NOTES ……………………………… 13 Polyplacophora 13 Gastropoda …………………………………………………………………………………… 13 Nudibranchia 17 Bivalvia …………………………………………………………………………………… 17 Scaphopoda 19 Cephalopoda …………………………………………………………………………………… 19 Echinodermata 19 Crustacea – Decapoda ………………………………………………………………………… 20 Amphipoda 20 Isopoda …………………………………………………………………………………… 21 Barnacles 21 Ostracoda …………………………………………………………………………………… 21 Coelenterata 21 Bryozoa …………………………………………………………………………………… 22 Worms 22 Nemertine Worms ………………………………………………………………………… 22 Platyhelminths 22 Sipunculids …………………………………………………………………………………… 22 Phoronids 22 Sponges …………………………………………………………………………………… 23 Sea Squirts 23 Fish ……………………………………………………………………………………………… 23 Algae 23 Lichens …………………………………………………………………………………… 26 Angiosperms 26 vii 6. BIOGEOGRAPHY ………………………………………………………………………… 27 6.1 BIODIVERSITY COMPARISONS 27 6.2 DISTINCTIVENESS OF THE WAITAKERES’ AND WEST COAST INTERTIDAL BIOTA ……………………………………………………………… 27 6.2.1 Species characteristics the exposed west coast of the North Island and Waitakeres 28 6.3 EXTENSION OF RECORDED GEOGRAPHIC RANGES OF MOLLUSC SPECIES ……………………………………………………………… 29 6.3.1 First West Coast records 29 6.3.2 Northward extension of range on the west coast …………………… 30 6.3.3 Southward extension of range on the west coast 30 6.4 TAXA WITH TYPE LOCALITIES ON THE WAITAKERES’ COAST ………… 30 7. GEOGRAPHIC DISTRIBUTION PATTERNS AROUND THE WAITAKERES’ COASTLINE ……………………………………………………………… 33 7.1 CLUSTER ANALYSIS METHODOLOGY 33 7.2 CLUSTER ANALYSIS RESULTS …………………………………………………… 33 7.2.1 Manukau Harbour coast biogeographic clusters 33 7.2.2 West coast biogeographic clusters ………………………………………… 33 7.3 GEOGRAPHIC DISTRIBUTION OF SPECIES AROUND THE WAITAKERES’ COASTLINE 34 7.3.1 Chitons ………………………………………………………………………… 34 7.3.2 Gastropods 34 7.3.3 Nudibranchs ……………………………………………………………… 34 7.3.4 Bivalves 35 7.3.5 Echinoderms ……………………………………………………………… 35 7.3.6 Crabs 35 7.3.7 Barnacles ………………………………………………………………………… 35 7.3.8 Sea Anemones 35 7.3.9 Sea Squirts ……………………………………………………………… 35 7.3.10 Seaweeds 35 8. COASTAL DYNAMICS AND CHANGES TO THE INTERTIDAL BIOTA ………… 37 8.1 PHYSICAL CHANGES TO THE WAITAKERES’ COASTLINE 37 8.1.1 Physical changes to the Waitakeres’ coastline ……………………………… 37 8.1.2 Coastal erosion 37 8.1.3 Coastal sand accretion and movement ……………………………… 37 8.1.4 Impact of moving beach sand 38 8.2 BIOTIC CHANGES ON THE WAITAKERES’ COASTLINE …………………… 38 8.2.1 Bull-kelp die-offs 38 8.2.2 Introduced marine biota …………………………………………………… 38 8.2.3 Variations in recruitment success 39 8.2.4 Human harvesting impacts ………………………………………………….… 39 8.2.5 Other changes 40 9. COASTAL SECTIONS WITH POTENTIAL FOR PROTECTIVE STATUS ………… 41 9.1 SECTIONS WITH HIGH BIODIVERSITY VALUES 41 9.1.1 West coast ……………………………………………………………… 41 9.1.1.1 Te Waharoa coast 41 9.1.1.2 Anawhata coast …………………………………………………… 42 9.1.2 Outer north Manukau Harbour coastline 42 9.1.2.1 Destruction Gully coast ………………………………………… 42 9.1.2.2 Puponga Point coast 42 9.1.3 Inner north Manukau Harbour coastline ……………………………… 42 9.1.3.1 Lawry Point coast 43 9.2 SECTIONS WITH EDUCATIONAL VALUES ………………………………………… 43 9.2.1 Maori Bay coast 43 9.2.2 Piha coast ……………………………………………………………… 43 9.2.3 West Huia coast 44 9.2.4 Armour Bay coast …………………………………………………… 44 9.3 PROTECTION FROM WHAT ? 44 10. ACKNOWLEDGEMENTS ……………………………………………………………… 45 viii 11. REFERENCES ………………………………………………………………………………….. 47 12. APPENDICES ………………………………………………………………………………….. 51 12.1 APPENDIX 1. FIELD SURVEYS 51 12.2 APPENDIX 2. RECENT SCIENTIFIC NAME CHANGES ……………………………… 51 12.3 APPENDIX 3. SPECIES LIST 53 13. TABLES ………………………………………………………………………………….. 69 13.1 Table 1. Total number of species (live or dead) of different animal and plant groups recorded from the coast of the Waitakere Ranges 69 13.2 Table 2. Taxa with type localities on the coast of the Waitakere Ranges .. 70 14. FIGURES ………………………………………………………………………………….. 71 14.1 Figure 1. Location of Waitakere Ranges coastline study area on the west coast of the Auckland region. 71 14.2 Figure 2. Characteristic biota of the sheltered stable boulder beaches along the north Manukau Harbour coastline of the Waitakere Ranges. ………… 72 14.3 Figure 3. Characteristic biota of the sheltered soft sediment intertidal habitats along the north Manukau Harbour coast of the Waitakere Ranges. 73 14.4 Figure 4. Animals, grouped according to their original source habitat, that are commonly found washed up on the exposed west coast sandy beaches of the Waitakere Ranges. ……………………………………………………………… 74 14.5 Figure 5. Location of intertidal transects (Figs. 6-18) around the rocky coast of the Waitakere Ranges. 75 14.6 Figure 6. Transect 1 showing the intertidal zonation of the dominant plants and animals on the rocky shore beneath the gannet colony at Otakamiro Point, Muriwai. 76 14.7 Figure 7. Transect 2 showing the intertidal zonation of the dominant plants and animals on the rocky shore composed of hard basaltic andesite at the south end of Pillow Lava Bay, south of Muriwai. 77 14.8 Figure 8. Transect 3 showing the intertidal zonation of the dominant plants and animals on the rocky shore in a gut at Kotau Point, north Te Henga. ………… 78 14.9 Figure 9. Transect 4 showing the intertidal zonation of the dominant plants and animals on the rocky shore composed of pillow lava at the south end of Te Henga Beach. 79 14.10 Figure 10. Transect 5 showing the intertidal zonation of the dominant plants and animals on the rocky shore on the south facing, partly sheltered, side of Te Waha Point, North Piha. …………………………………………………… 80 14.11 Figure 11. Transect 6 showing the intertidal zonation of the dominant plants and animals on the steep rocky shore on the
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