__________________________________________________________________________________________ REVIEW OF THE BOTANICAL VALUES ON THE SOUTH WEST YARRAGADEE PROJECT AREAS Prepared for: Water Corporation Prepared by: Mattiske Consulting Pty Ltd September 2005 MATTISKE CONSULTING PTY LTD __________________________________________________________________________________ __________________________________________________________________________________________ TABLE OF CONTENTS Page REVIEW OF THE BOTANICAL VALUES.................................................................................................1 ON THE..........................................................................................................................................................1 SOUTH WEST YARRAGADEE PROJECT AREAS...................................................................................1 Prepared for: ....................................................................................................................................................1 Water Corporation.........................................................................................................................................1 Prepared by: .....................................................................................................................................................1 Mattiske Consulting Pty Ltd..........................................................................................................................1 MATTISKE CONSULTING PTY LTD........................................................................................................1 TABLE OF CONTENTS ...............................................................................................................................2 Page ................................................................................................................................................................2 1. SUMMARY .............................................................................................................................................1 2. CLASSIFICATION METHODS AND ASSUMPTIONS ..........................................................................4 2.1 Confidence in coverage of Flora Species...................................................................................................4 2.2 Vegetation Complexes..............................................................................................................................4 2.3 Site•Vegetation Types ..............................................................................................................................5 2.4 Floristic Associations ...............................................................................................................................5 2.5 Species.....................................................................................................................................................5 2.6 Groundwater Dependency Versus Soil Moisture Dependency ...................................................................6 2.7 Limitations and Gaps................................................................................................................................6 3. EAST SWAN COASTAL PLAIN.............................................................................................................7 3.1 Vegetation Complexes..............................................................................................................................7 3.2 Vegetation Complexes – Potential Risks...................................................................................................7 3.3 Threatened Ecological Communities.........................................................................................................7 3.4 Flora Values...........................................................................................................................................11 3.5 Recommendations and Offsetting Options ..............................................................................................12 4. ROSA BROOK ......................................................................................................................................17 4.1 Vegetation Complexes............................................................................................................................17 4.2 Vegetation Complexes – Potential Risks.................................................................................................17 4.3 Threatened Ecological Communities.......................................................................................................17 4.4 Site•Vegetation Types ............................................................................................................................18 4.5 Flora Values...........................................................................................................................................19 Table RB3: Summary of Species Preferences for Different Site Preferences at Rosa Brook..............23 Table RB3: Summary of Species Preferences for Different Site Preferences at Rosa Brook..............24 Table RB3: Summary of Species Preferences for Different Site Preferences at Rosa Brook..............25 Table RB3: Summary of Species Preferences for Different Site Preferences at Rosa Brook..............26 4.6 Recommendations and Offsetting Options ..............................................................................................27 5. ST JOHN BROOK .................................................................................................................................27 5.1 Vegetation Complexes............................................................................................................................27 5.2 Vegetation Complexes – Potential Risks.................................................................................................28 5.3 Threatened Ecological Communities.......................................................................................................28 5.4 Site•Vegetation Types ............................................................................................................................28 5.5 Flora Values...........................................................................................................................................29 5.6 Recommendations and Offsetting Options ..............................................................................................32 6. POISON GULLY ...................................................................................................................................33 6.1 Vegetation Complexes............................................................................................................................33 6.2 Vegetation Complexes – Potential Risks.................................................................................................33 6.3 Threatened Ecological Communities.......................................................................................................33 6.4 Site•Vegetation Types ............................................................................................................................34 6.5 Flora Values...........................................................................................................................................35 Table PG2: Summary of Species Preferences for Different Site Preferences at Poison Gully............39 Table PG2: Summary of Species Preferences for Different Site Preferences at Poison Gully............40 Table PG2: Summary of Species Preferences for Different Site Preferences at Poison Gully............41 Table PG2: Summary of Species Preferences for Different Site Preferences at Poison Gully............42 Table PG2: Summary of Species Preferences for Different Site Preferences at Poison Gully............43 __________________________________________________________________________________ __________________________________________________________________________________________ 6.6 Recommendations and Offsetting Options ..............................................................................................44 7. MILYEANNUP BROOK .......................................................................................................................44 7.1 Vegetation Complexes............................................................................................................................44 7.2 Vegetation Complexes – Potential Risks.................................................................................................45 7.3 Threatened Ecological Communities.......................................................................................................45 7.4 Site•Vegetation Types ............................................................................................................................45 7.5 Flora Values...........................................................................................................................................46 Table ML2: Summary of Species Preferences for Different Site Preferences at Milyeannup Brook ..50 Table ML2: Summary of Species Preferences for Different Site Preferences at Milyeannup Brook ..51 Table ML2: Summary of Species Preferences for Different Site Preferences at Milyeannup Brook ..52 Table ML2: Summary of Species Preferences