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Aquatic Plants Technical Assistance Program 1998 Activity Report Acknowledgments

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Aquatic Plants Technical Assistance Program 1998 Activity Report Acknowledgments Aquatic Plants Technical Assistance Program 1998 Activity Report June 1999 Publication No. 99-328 For additional copies of this report, contact: Department of Ecology Publications P.O. Box 47600 Olympia, WA 98504-7600 Telephone: (360) 407-7472 The Department of Ecology is an equal opportunity agency and does not discriminate on the basis of race, creed, color, disability, age, religion, national origin, sex, marital status, disabled veteran’s status, Vietnam Era veteran’s status, or sexual orientation. For more information or if you have special accommodation needs, please contact Michelle Ideker at (360) 407-6677. Ecology Headquarters telecommunications device for the deaf (TDD) number is (360) 407-6006. Ecology Regional Office TDD numbers are as follows: SWRO (TDD) (360) 407-6306 NWRO (TDD) (206) 649-4259 CRO (TDD) (509) 454-7673 ERO (TDD) (509) 458-2055 Aquatic Plants Technical Assistance Program 1998 Activity Report prepared by Jenifer Parsons Washington State Department of Ecology Environmental Assessment Program Olympia, Washington 98504-7710 June 1999 Publication No. 99-328 Table of Contents List of Figures .................................................................................................................................ii List of Tables...................................................................................................................................ii Acknowledgments..........................................................................................................................iii Abstract .......................................................................................................................................... iv Introduction ..................................................................................................................................... 1 Technical Assistance....................................................................................................................... 2 Site Visits ........................................................................................................................................ 4 Introduction.............................................................................................................................. 4 Site Visit Objectives................................................................................................................. 4 Field Methods .......................................................................................................................... 4 Aquatic Plant Survey Results................................................................................................... 5 General Results .................................................................................................................5 Hydrilla verticillata - An Update.................................................................................... 12 Black River Polygonum hydropiper ............................................................................... 13 Rare Plants ...................................................................................................................... 13 Loon Lake Study .................................................................................................................... 15 Introduction..................................................................................................................... 15 Methods .......................................................................................................................... 16 Results and Discussion ................................................................................................... 19 Alkalinity Results................................................................................................................... 26 Herbarium...................................................................................................................................... 30 Methods Used in Aquatic Plant Identification....................................................................... 30 Methods Used in Collection and Preservation....................................................................... 30 Aquatic Weed Management Fund Related Activities ................................................................... 31 Aquatic Plant Field Guide...................................................................................................... 31 References ..................................................................................................................................... 32 Appendix A Site Visit Summary Table 1994-1998 Appendix B Myriophyllum spicatum Distribution Map Appendix C Alkalinity Results 1995-1998 Appendix D Plant Identification References Appendix E Herbarium Specimens, Grouped by Family Aquatic Plants Technical Assistance Program Page i 1998 Activity Report List of Figures Figure 1. Known locations of Egeria densa in Washington, 1998.................................................... 9 Figure 2. Known locations of Myriophyllum aquaticum in Washington, 1998. ............................. 10 Figure 3. Known locations of Utricularia inflata in Washington, 1998. ........................................ 11 Figure 4. Black River Polygonum hydropiper density. ................................................................... 14 Figure 5. Loon Lake map ................................................................................................................ 15 Figure 6. Loon Lake, location of treatment plots. ........................................................................... 17 Figure 7. Box plot of alkalinity ranges for selected macrophytes. .................................................. 28 List of Tables Table 1. Scientific and common plant names .................................................................................... 1 Table 2. Aquatic plant technical outreach activities - 1998............................................................... 3 Table 3. 1998 Site visit and results summary table........................................................................... 6 Table 4: Aquatic plant species in Loon Lake. ................................................................................. 20 Table 5. Mean biomass of selected species (g/m2).......................................................................... 21 Table 6. Mean biomass (g/m2) of monocots and dicots. ................................................................. 22 Table 7. Species observed on line intercept transects. .................................................................... 23 Table 8. Macrophyte frequency, untreated plots ............................................................................. 24 Table 9. Macrophyte frequency, treated plots .................................................................................. 24 Table 10. Results of Chi-square analysis on the point intercept frequency data............................. 25 Table 11: Comparison of Alkalinity Ranges.................................................................................... 29 Page ii Aquatic Plants Technical Assistance Program 1998 Activity Report Acknowledgments There are many people I would like to thank for contributions to this document and the projects described within: ! Sarah O’Neal and Maggie Bell-McKinnon for assistance with field work and other support during the field season. ! Dave Hallock, Kathy Hamel and Michelle Ideker for reviewing and publishing the document. ! Dr. William Ehinger for assistance with statistical analysis of the Loon Lake data, and document review. ! Dr. John Madsen and Dr. Kurt Getsinger for advice and assistance with the Loon Lake project. ! Judy and Jim Richardson for support and assistance with the Loon Lake project. ! Sarah Gage from the University of Washington Herbarium, Western Washington University herbarium staff, and Washington State University staff for assistance with plant distribution information and identification. ! Dr. Peter Hoch and Dr. Alan Whittemore of the Missouri Botanical Garden for assistance with plant identification and nomenclature. ! Dr. Robert Haynes of the University of Alabama and Dr. Adolf Ceska for help with identifying plant specimens. ! Dr. Galen Smith from the University of Wisconsin for assistance with plant identification and taxonomy. Aquatic Plants Technical Assistance Program Page iii 1998 Activity Report Abstract The objectives of the Aquatic Plant Technical Assistance Program are to (1) provide advice on aquatic plant identification, biology, and management to government agencies and the public, (2) document aquatic plant distribution and habitat through site visits, and (3) assist with evaluating projects supported by Freshwater Aquatic Weed Program grant money. During the 1998 field season, aquatic plant data were gathered during 74 site visits to 68 waterbodies located throughout the state. Several previously unknown populations of non-native invasive aquatic plants were recorded. These included eight previously unknown populations of Myriophyllum spicatum, and two populations of Egeria densa. A special project to create three different boatlaunch signs educating boaters about invasive aquatic plants was completed and the signs are available for distribution. Other accomplishments during 1998 included gathering additional plants for the herbarium collection, providing educational and technical outreach, taking
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