Metropolitan Adelaide and Northern Coastal Action Plan 2009 VOLUME 2
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Metropolitan Adelaide and Northern Coastal Action Plan 2009 VOLUME 2 Authors Brian Caton (1) Doug Fotheringham (2) Ellen Krahnert (3) Jill Pearson (4) Matthew Royal (5) Ron Sandercock (6) Prepared for the Adelaide and Mount Lofty Ranges NRM Board. (1) Consultant. Adjunct Senior Lecturer, Environmental Management, Flinders University of SA, (2) Senior Scientific Officer, Coastal Management Branch, Department for Environment and Heritage, (3) Fauna Consultant, Mount Torrens, South Australia, (4) Coastal Project Coordinator, Urban Biodiversity Unit, Department for Environment and Heritage, (5) GIS Analyst, Spatial Information Services Branch, Information, Science and Technology, Department for Environment and Heritage, and (6) Coastal Officer, Coastal Management Branch, Department for Environment and Heritage. This plan is a coastal conservation assessment and coastal action plan for the Metropolitan Adelaide coast between Sellicks Beach to the Port Wakefield Proof Range and builds upon the Conservation Assessment of the Northern and Yorke Coast, Far West Coastal Action Plan and Conservation Priority Study and the Southern Fleurieu Coastal Action Plan and Conservation Priority Study This publication may be cited as: Caton B., Fotheringham D., Krahnert E., Pearson J., Royal M. and Sandercock R. 2009. Metropolitan Adelaide and Northern Coastal Action Plan. Prepared for the Adelaide and Mount Lofty Ranges NRM Board and Department for Environment and Heritage For further information about the Metropolitan Adelaide and Northern Coastal Action Plan 2009 including copies of the report and electronic GIS data can be obtained from: Adelaide and Mount Lofty Ranges NRM Board 205 Greenhill Road, Eastwood SA 5063 Phone: 8273 9100 Email: [email protected] Front and Back Cover Photographs Bill Doyle: ISBN: [978-0-646-51827-5] Table of Contents Table of Contents Volume 2: RESULTS Table of Contents (Volumes 1 and 2) i Volume 2. List of Figures ii Volume 2. List of Tables iii Volume 2. Introduction 1 6. Conservation and Threat Summary Scores 2 6.1. Conservation Summary Mean Results 2 6.2. Threatening Processes Mean Results 2 7. Cell Descriptions (incl. plant and animal lists for each cell) 5 7.1. Constructing the Cell Descriptions 5 7.2. Deciding on Priority of Proposed Actions 5 7.3. Description and Analysis of Coastal Cells, including Local Management Priorities 7 7.3.1. MA1 Sellicks Beach 7 7.3.2. MA2 Silver Sands 23 7.3.3. MA3 Snapper Point 51 7.3.4. MA4 Port Willunga Beach 65 7.3.5. MA5 Maslins Beach 75 7.3.6. MA6 Moana 89 7.3.7. MA7 Seaford 105 7.3.8. MA8 Port Noarlunga 115 7.3.9. MA9 Witton Bluff - Christies Beach 135 7.3.10. MA10 Port Stanvac 145 7.3.11. MA11 Hallet Cove 163 7.3.12. MA12 Holdfast Bay 185 7.3.13. MA13 Patawalonga - Point Malcolm 201 7.3.14. MA14 Le Fevre Peninsula 219 7.3.15. MA15 Port Adelaide 241 7.3.16. MA16 Torrens Island - Section Bank 251 7.3.17. MA17 Barkers Inlet 267 7.3.18. MA18 Gawler River 283 7.3.19. MA19 Middle Beach 303 7.3.20. MA20 Light River Delta 317 7.3.21. MA21 Port Prime 327 7.3.22. MA22 Thompson Beach 339 7.3.23. MA23 Parham 353 7.3.24. MA24 Middle Spit 365 8. Regional Management Proposals 381 Metropolitan Adelaide and Northern Coastal Action Plan i List of Figures List of Figures: Volume 2 Figure 1. Conservation Priority Locations 3 Figure 2. Threatening Process Locations 4 Figure 3. Cell MA1 Location Map 7 Figure 4. Cell MA2 Location Map 23 Figure 5. Detailed Conservation Summary Map Cell MA2 24 Figure 6. Cell MA3 Location Map 51 Figure 7. Cell MA4 Location Map 65 Figure 8. Cell MA5 Location Map 75 Figure 9. Cell MA6 Location Map 89 Figure 10. Cell MA7 Location Map 105 Figure 11. Cell MA8 Location Map 115 Figure 12. Detailed Conservation Summary Map Cell MA8 116 Figure 13. Cell MA9 Location Map 135 Figure 14. Cell MA10 Location Map 145 Figure 15. Detailed Conservation Summary Map Cell MA10 146 Figure 16. Cell MA11 Location Map 163 Figure 17. Detailed Conservation Summary Map Cell MA11 164 Figure 18. Cell MA12 Location Map 185 Figure 19. Cell MA13 Location Map 201 Figure 20. Cell MA14 Location Map 219 Figure 21: Cell MA15 Location Map 241 Figure 22. Cell MA16 Location Map 251 Figure 23. Detailed Conservation Summary Map Cell MA16 252 Figure 24. Cell MA17 Location Map 267 Figure 25. Cell MA18 Location Map 283 Figure 26. Detailed Conservation Summary Map Cell MA18 284 Figure 27. Cell MA19 Location Map 303 Figure 28. Cell MA20 Location Map 317 Figure 29. Cell MA21 Location Map 327 Figure 30. Cell MA22 Location Map 339 Figure 31. Detailed Conservation Summary Map Cell MA22 340 Figure 32. Cell MA23 Location Map 353 Figure 33. Cell MA24 Location Map 365 Metropolitan Adelaide and Northern Coastal Action Plan ii List of Figures List of Tables: Volume 2 Table 1. Cell Description Template 5 Table 2. Priority of Proposed Actions 5 Table 3. Recommended Actions and Priority for MA1 – Sellicks Beach 10 Table 4. Recommended Actions and Priority for MA2 – Silver Sands 27 Table 5. Recommended Actions and Priority for MA3 – Snapper Point 53 Table 6. Recommended Actions and Priority for MA4 – Port Willunga 68 Table 7. Recommended Actions and Priority for MA5 – Maslin Beach 78 Table 8. Recommended Actions and Priority for MA6 – Moana 91 Table 9. Recommended Actions and Priority for MA7 – Seaford 107 Table 10. Recommended Actions and Priority for MA8 – Port Noarlunga 119 Table 11. Recommended Actions and Priority for MA9 - Christies Beach 137 Table 12. Recommended Actions and Priority for MA10 – Port Stanvac 148 Table 13. Recommended Actions and Priority for MA11 – Hallett Cove 166 Table 14. Recommended Actions and Priority for MA12 – Holdfast Bay 188 Table 15. Recommended Actions and Priority for MA13 - Patawalonga to Point Malcolm 204 Table 16. Recommended Actions and Priority for MA14 – Le Fevre Peninsula 222 Table 17. Recommended Actions and Priority for MA15 – Port Adelaide 243 Table 18. Recommended Actions and Priority for MA16 – Torrens Island 254 Table 19. Recommended Actions and Priority for MA17 – Barkers Inlet 269 Table 20. Recommended Actions and Priority for MA18 - Gawler River 287 Table 21. Recommended Actions and Priority for MA19 – Middle Beach 305 Table 22. Recommended Actions and Priority for MA20 – Light River Delta 319 Table 23. Recommended Actions and Priority for MA21 – Port Prime 329 Table 24. Recommended Actions and Priority for MA22 – Thompson Beach 342 Table 25. Recommended Actions and Priority for MA23 – Parham 355 Table 26. Recommended Actions and Priority for MA24 – Middle Spit 367 Metropolitan Adelaide and Northern Coastal Action Plan iii List of Figures Metropolitan Adelaide and Northern Coastal Action Plan iviv Introduction Introduction The goal of this study is to understand and facilitate the conservation, protection and maintenance of the Adelaide and Mount Lofty Ranges NRM (AMLR NRM) natural coastal resources from Sellicks Beach to the Port Wakefield Proof Range, and to establish conservation priorities for places and areas within the region. In addition, the report outlines suggested actions to address threatening processes at specific locations within the region. The report has been divided into two volumes: Volume 1 of this report includes the rationale for the study, the data on which it is based (in appended spreadsheets), the methodology of valuing the data and placing it on digital maps; together with regional overviews of conservation values and threats. Volume 2 presents the results of the GIS study for the region Chapter 7: GIS results for each coastal sub-region, or ‘cell’, the results of field and desk based investigation, as well as consultation with key players. Actions to reduce threats are proposed, and prioritised from the conservation and threat analyses. Thus description, conservation values, threats and actions are brought together at the local level, but within a regional context. It is hoped this will assist individuals, groups and organisations working on sustainable management of coastal areas at the local scale. Chapter 8 builds on the assembled local conclusions and actions to propose regional actions. For detailed location maps see Volume 1. Metropolitan Adelaide and Northern Coastal Action Plan 1 Introduction Metropolitan Adelaide and Northern Coastal Action Plan 22 Results 6. Conservation and Threat Summary Scores The mean scores from the GIS analysis are summarised under the 31 Conservation and 19 Threat variable (layer) headings for each cell. These scores represent averages for each variable for the cell (see Appendix 11 in Volume 1). These are totalled for each cell: ‘Total for Threat Summary Layers’ and ‘Sum of Conservation Summary Means’. 6.1. Conservation Summary Mean Results Sub-Regions Northern Saltmarsh (MA16 to 24) – seven out of nine are above average: cells MA22, 21, and 18 are ranked first, second and third in the region. All cells are relatively high for vegetation patch metrics, reptile and bird habitat and threatened plants and associations. City (MA12 to 15) – three out of four have low totals: cell MA15 Port Adelaide is easily the lowest for the region with low to absent scores for all variables, although some threatened plant associations show sound scores. Southern Cliffs (MA1 to 11) – these show generally low (five) to medium (five) values, with one standout high value cell, MA2 Silver Sands that includes the Aldinga Scrub. Cells MA22 and 21, Thompson Beach and Port Prime. These adjacent cells are the highest value totals for the region. These cells score well in all variables, but have relatively high scores for focal species (Samphire Thornbill & Painted Dragon) and reptile habitat. Cell MA2 Silver Sands/ Aldinga Scrub. This stands out above adjacent cells, with generally high totals, and outstanding scores for butterfly and bird habitat, species richness and natural heritage.