Fighting the Spread of Invasive Species: Tests of Decontamination Techniques
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1 Fighting the Spread of Invasive Species: Tests of Decontamination Techniques Bart De Stasio Biology Department Lawrence University Appleton, WI
2 Wisconsin Aquatic Invasive Species (February 2016) Great Lakes has many invasive species Heavy boating and other recreational uses Many potential dispersal modes Current AIS Status: 15 invertebrates 6 fish 16 plants
3 New Zealand Mudsnail (Potamopyrgus antipodarum) Small freshwater snail (3 4 mm) High densities in streams Operculum covers opening Seals perfectly with opening of shell Allows for long term survival out of water Currently in 3 WI locations
4 Spiny Water Flea (Bythotrephes longimanus) ( _3677_ ,00.html) Small predacious crustacean ( Introduced to Great Lakes in ballast water in 1984 Fouls fishing gear, competes with fish for food Currently in 23 WI locations
5 Mudsnail Collection Black Earth Creek (west of Madison)
6 Mudsnail Collection
7 Spiny Water Flea Collection Lower Green Bay
8 Lab Test Procedure Holding Conditioning (1 hr) Test (Variable Times) Recovery (20 min) Assessment
9 Lab Test Example Rep 1 Rep 2 Rep 3 Rep 4 Rep 5 1 min Test Recovery Assess Rep 1 Rep 2 Rep 3 Rep 4 Rep 5 5 min Test Recovery Assess Holding Rep 1 Rep 2 Rep 3 Rep 4 Rep 5 10 min Test Recovery Assess Conditioning Test Each Replicate included 15 animals: Control without material (5 reps) Control with material (5 reps) Disinfectant with material (5 reps)
10 Lab Tests
11 Mudsnail Lab Tests (I = Immersion, S = Spray) Material Virkon Bleach Formula 409 (2%) (400 ppm) Polyester line (anchors) I & S Nylon Nets I & S (Dip/plankton nets) Neoprene (wetsuit/wader) I & S Canvas I & S I & S I & S Rubber (wader/boots) I & S I & S I & S Felt (wader sole) I & S I & S
12 Spiny Water Flea Lab Tests (I = Immersion, S = Spray) Material Virkon Bleach Freezing (2%) (400 ppm) Polyester line (anchors) I & S I & S S Nylon Nets I & S I & S S (Dip/plankton nets) Neoprene (wetsuit/wader) I & S I & S S Canvas I & S I & S
13 Mudsnail Sizes 2015
14 Mudsnail Survival: Saltwater 100.0% Survival (%) 80.0% 60.0% 40.0% 20.0% Salt Bath w/canvas Control w/canvas Control w/canvas 0.0% Time (m) (mean +/ 1 SEM)
15 Mudsnail Survival: Virkon 100.0% Survival (%) 80.0% 60.0% 40.0% 20.0% Virkon w/canvas Control w/canvas Control w/o Canvas 0.0% Time (m) (mean +/ 1 SEM)
16 Mudsnail Survival: Bleach 100 Survival (%) Bleach Spray Bleach Immersion Control w/ Rubber Control w/o Rubber Time (min) (mean +/ 1 SEM)
17 Mudsnail Test Results Mean Percent Survival (Immersion / Spray) Material Virkon Bleach Formula 409 (2%) (400 ppm) Polyester line (anchors) 3.6 / 8.9 Nylon Nets 10.7 / 26.6 (Dip/plankton nets) Neoprene 1.3 / 21 (wetsuit/wader) Canvas / / 1.3 Rubber (wader/boots) 0 0 / / 1.3 Felt (wader sole) 0 0 / 0
18 New Zealand Mudsnail Results Virkon & Formula 409 very effective Bleach & salt not effective (>30 min) Spraying less effective Material makes a difference with Bleach Mud significantly decreases effectiveness
19 Spiny Water Flea Sizes 2015
20 Spiny Water Flea Test Results Mean Percent Survival (Immersion / Spray) Material Virkon Bleach Freezing (2%) (400 ppm) Polyester line (anchors) 0 / 0 0 / 0 0 Nylon Nets 0 / 0 0 / 0 0 (Dip/plankton nets) Neoprene 0 / 0 0 / 0 0 (wetsuit/wader) Canvas 0 / 0 0 / 1.3 Some eggs in brood chambers survive
21 Spiny Water Flea Results Virkon, Bleach & Freezing effective Immersion and Spraying equally effective Eggs in brood chambers can survive No differences based on materials
22 Acknowledgments Wisconsin Dept of Natural Resources Excellence in Science Fund, Lawrence University Student Assistants: Chris Acy Katie Frankel Casey Merkel Sarah Lawhun Zoe Psarouthakis
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