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Lasqueti Island Surf Smelt and Pacific Sand Lance Spawning Habitat Suitability Assessments

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Lasqueti Island Surf Smelt and Pacific Sand Lance Spawning Habitat Suitability Assessments Lasqueti Island Surf smelt and Pacific sand lance Spawning Habitat Suitability Assessments Chris & Doug’s Beach – Lasqueti Island Photo: RC de Graaf Prepared for the Islands Trust Fund and Pacific Salmon Foundation Prepared by: Ramona C. de Graaf, BSc, MSc Marine Biologist Forage Fish Specialist British Columbia Marine Conservation and Research Society (Sea Watch Society) March 2017 1 Table of Contents Acknowledgements ............................................................................................................................... 4 1. Introduction ................................................................................................................................. 5 1.1 Role of forage fish in marine ecosystems .......................................................................................... 5 1.2 Connections to other valued ecosystem components ..................................................................... 5 1.3 Protecting the ecosystem services of Marine Riparian Vegetation ................................................... 6 2. Beach Spawning Forage Fish Habitat ......................................................................................... 8 3. Spawning Habitat Characteristics ............................................................................................... 9 3.1 Intertidal Elevation ................................................................................................................................. 9 3.2 Sediment Characteristics ..................................................................................................................... 9 3.3 Beach Biophysical Characteristics .................................................................................................... 10 4. Spawning Seasons ................................................................................................................... 10 5.0 Spawning Beaches ....................................................................................................................... 10 6.0. Threats to Beach Spawning Forage Fish Habitat .................................................................. 11 6.1 Shoreline Modification............................................................................................................................. 11 6.2 Marine Riparian Vegetation Habitat Modification ............................................................................... 12 6.3 Sea Level Rise ......................................................................................................................................... 12 7. Introduction to the Beach Spawning Forage Fish Habitat Assessment ...................................... 14 7.1 General Introduction ............................................................................................................................ 14 7.2 Area Surveyed ..................................................................................................................................... 14 8.0. Methods ................................................................................................................................. 15 8.1 General Methodology .......................................................................................................................... 15 8.2 GPS/GIS Methodology ....................................................................................................................... 16 8.2.1 Spatial Data Specifications ............................................................................................................. 16 8.2.2 Digitizing Spatial Data and Map Production ................................................................................ 16 9.0 Project Limitations ..................................................................................................................... 16 10.0 Lasqueti Island – Geomorphic Setting and Beach Shoreline Types ...................................... 17 11.0 Results ................................................................................................................................... 18 11.1 Statistical Analyses .......................................................................................................................... 18 11.2 Grain-Size Analyses ........................................................................................................................ 25 11.3 Length of Suitable Forage Fish Spawning Habitat ..................................................................... 25 11.4 Suitable Forage Fish Spawning Habitat Beach Types .............................................................. 26 11.5 Geographic Position of Suitable Forage Fish Spawning Beaches ................................................ 27 11.5.1 Geographic Position ...................................................................................................................... 27 11.5.2 Geomorphic habitat types ............................................................................................................. 27 11.6 Foreshore Modification.................................................................................................................... 28 11.7 Foreshore and Backshore Structures ........................................................................................... 28 11.8 Overhanging Shade Vegetation .................................................................................................... 30 12.0 Summary ..................................................................................................................................... 32 13.0 Mitigating Stressor Impacts and Planning Habitat Enhancement/Restoration ............................ 34 13.1 Marine Shoreline Stewardship ............................................................................................................ 34 13.2 Local Governance: ................................................................................................................................ 34 13.3 Marine Shoreline Protection and Climate Change Adaptation Toolkit for Landowners: ............ 34 13.4 Stressors and Enhancement/Restoration .......................................................................................... 36 13.4.1 Stressors: ........................................................................................................................................ 36 13.4.2 Enhancement/Restoration ............................................................................................................ 37 14.0 Specific Marine Shoreline Protection/Enhancement Recommendations ..................................... 38 14.1 Shoreline Building Setbacks ............................................................................................................ 38 14.2 Shoreline Structures ............................................................................................................................. 38 2 14.2.1 Shoreline Erosion Mitigation ........................................................................................................ 38 14.2.2 Piers and Docks ............................................................................................................................. 39 14.2.3 Other foreshore alterations ........................................................................................................... 39 14.3 Marine Riparian Vegetation and Overhanging Shade Vegetation ................................................ 40 14.4 Public Access ......................................................................................................................................... 41 14.5 Beach Health/Water Quality Enhancement ...................................................................................... 41 15.0 Potential future uses of data provided ......................................................................................... 42 15.0 References Cited: ....................................................................................................................... 43 Appendices Appendix A: Beach Units 44 Appendix B: Not Habitat Types, Pocket Coves 46 Appendix C: Beach Spawning Habitat Types 47 Appendix D: Beach Habitat Types Grain-Size Curves, Figures 2, 3, 4, 5, 6 and 7 50 Appendix E: GPS/GIS Methodology 53 Appendix F: Digitizing Spatial Data and Map production 57 Appendix G: Forage Fish Habitat Assessment Methodology 57 : List of Figures: Figure 1A-H: Lasqueti Island Forage Fish Suitable Spawning Habitat Map ........................ 20 List of Tables: Table 1: Lasqueti Island Beach Unit Statistical Analyses ........................................................................... 18 Table 2: Lasqueti Island – Classification of Suitable Forage Fish Spawning Beach Units ................... 25 Table 3: Lasqueti Island - Beach Units Grain-Size Types ........................................................................... 26 Table 4: Lasqueti Island Coast Line - Suitable Forage Fish Spawning Beach Units ............................. 27 Table 5: Lasqueti Island Beach Units - Foreshore Modification ................................................................. 28 Table 6: Lasqueti Island Beach Units – Foreshore and Backshore Structures ...................................... 29 Table 7: Lasqueti Island Beach Units – Overhanging Shade Vegetation Index ...................................... 30 3 Acknowledgements
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