MANAGEMENT OF AQUATIC INVASIVE PLANT SPECIES USING DIVER ASSISTED SUCTION HARVESTING (DASH)
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1 MANAGEMENT OF AQUATIC INVASIVE PLANT SPECIES USING DIVER ASSISTED SUCTION HARVESTING (DASH) Wisconsin Lake Convention Stevens Point, WI March 31 st 2016 Photo Credit: GLIFWC
2 Overview What is Diver Assisted Suction Harvesting? Considerations Efficacy Case Studies Expectations Take Home Messages Questions
3 What is Diver Assisted Suction Harvesting? DASH is a tool used in the management of aquatic invasive plant species. DASH utilizes divers to hand remove aquatic invasive plants from the lake-bed. Instead of divers coming to the surface to dispose of the removed plants or bagging them underwater, plants are fed into a suction line that transports plants to the surface. DASH is NOT bottom dredging.
4 General Considerations Less controversial Labor & equipment intensive Know your State regulations Hard to quantify Where you are on the invasive species curve
5 Considerations Invasion Curve Lake Wide Distribution and Abundance Adapted from:
6 Efficacy Effectiveness of suction harvesting on EWM at one year post removal ranged from 86%-94% (Eichler et al., 1993). At large scale moderate to high densities of EWM, hand removal resulted in less than 5% of frequency over 90% of the littoral area (Keltina & Laxar, 2010). Removal of hydrilla biomass successful with the use of suction harvesting, however, effectiveness at removing tubers limited (Johnston & Johnson, 2011 Interim conclusions).
7 Eichler et al., 1993 Selectivity
8 Chicaugon Lake - Iron County, MI
9 Chicaugon Lake - Iron County, MI
10 Chicaugon Lake - Iron County, MI 2013 Pre 2014 Pre 2015 Pre 2013 Post 2014 Post 2015 Post
11 Smoky Lake Vilas County, WI & Iron County, MI
12 Smoky Lake Vilas County, WI & Iron County, MI Pre 2014 Pre 2015 Post 2014 Post 2015
13 Expectations Garden Analogy gardenguides.com
14 Expectations Garden Analogy Madsen et al., 1989
15 WDNR, 2016 Take Home Messages - BMPs
16 Take Home Messages Can be integrated, but may need to pay attention to timing. It is not a silver bullet, annual monitoring and follow up visits are necessary to ensure success. Hard to generalize across lakes, results maybe site or lake specific. Limited non-target ecological impacts. Decontamination takes time. Good to have a plan.
17 Eichler, L. W., Bombard, R. T., Sutherland, J. W., & Boylen, C. W Suction Harvesting of Eurasian Water milfoil and Its Effects on Native Plant Communities. JAPM. 31: Madsen, J.D., Sutherland, J. W., & Eichler, L. W Hand Harvesting Water milfoil In Lake George. Interim Report. FWI Report # Kelting, D. L., & Laxon, C. L Cost and Effectiveness of Hand Harvesting to Control the Eurasian Water milfoil Population in Upper Saranac Lake, New York. JAPM 48: 1-5. Johnston, R. & Johnson, R. (2011). Hydrilla verticillata Hand Removal: A review of suction-assisted hand-harvesting by divers in the Cayuga Inlet, Interim Conclusions.
18 Thank you! Thank you!
19 Lac Vieux Desert Vilas County, WI & Gogebic County, MI 2013 Hand Removal 2014 Hand Removal 2013 DASH 2014 DASH 2015 DASH ~ Number of ~ Number of Area of Lake Weight* (lbs) Weight* (lbs) Weight* (lbs) Weight* (lbs) Weight* (lbs) Plants Plants Thunder Bay North Desolation Point Simpson's Point South Shore ~ Rice Bay Rose's Island Near Island West Shore Slaughter Bay Big Duck West of Duck Point Open Water (east of islands) TOTALS
20 Kelting & Laxon, 2010
21 Considerations Integrated Management
22 Considerations - AIS Management Practices Small Scale Aquatic Herbicides Benthic Barriers Hand Removal - DASH Do Nothing Large Scale Aquatic Herbicides Draw Downs Mechanical Harvesting Do Nothing State Regulations Costs Desires/Values Management Goals/Objectives
23 Considerations- Efficiency Efficiency is affected by: Obstacles/Structure Water Clarity Sediment Type EWM Density & Distance Between Sites Native Vegetation Density & Type
24 Smoky Lake Vilas County, WI & Iron County, MI Adapted from work by Fred Clark, Clark Forestry, Inc. and WNDR-Urban Forestry
25 Smoky Lake Vilas County, WI & Iron County, MI 70 Rate of Harvest (pounds of EWM/hour of dive time) Jun 9-Jul 19-Jul 29-Jul 8-Aug 18-Aug 28-Aug 7-Sep 17-Sep 27-Sep 7-Oct
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