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Zebra Mussel Veliger Transport via Recreational Watercraft and Residual
Water
MAISRC | Adam Doll – Graduate Student | [email protected]
Presentation Overview
Current need for study
Project overview
Similar and recent studies
Preliminary data analysis
Continuing research
Next Steps
Q&A
MAISRC | Adam Doll – Graduate Student | [email protected]
Current Needs for Study
Zebra mussels continue to be discovered in new Minnesota lakes and rivers
MN laws have been created to minimize the movement of aquatic invasive species (AIS) and water
Clean – Drain - Dispose
MAISRC | Adam Doll – Graduate Student | [email protected]
But what happens next?
Water may remain in a variety of places after all plugs have been pulled (MN law) Watercraft are not designed to drain 100% of the water they may contain
This residual water may be transported to new water bodies via recreational equipment, and is the focus of this study
Residual water can be found in all types of recreational watercraft
Zebra mussel larvae (veligers) are small organisms easily transported in water
MAISRC | Adam Doll – Graduate Student | [email protected]
Study Goals
Residual water is an unknown risk
Measure how much water is moved, where it’s located, and what is present
Determine if veligers can survive in residual water (and for how long)
MAISRC | Adam Doll – Graduate Student | [email protected]
Internal Compartments
Splash Well
Live well/bait well/wet storageBilge Area(underneath)
MAISRC | Adam Doll – Graduate Student | [email protected]
Bait Well Live Well
BilgeBallast Tanks
Internal Compartments
MAISRC | Adam Doll – Graduate Student | [email protected]
I/O Inboard
Outboard
Watercraft Engines
Jet
MAISRC | Adam Doll – Graduate Student | [email protected]
Project Overview
Collect samples at two zebra mussel infested MN water bodies Minnetonka (Hennepin County)
Gull (Crow Wing, Cass County)
MAISRC | Adam Doll – Graduate Student | [email protected]
Project Overview
Residual water is voluntarily collected from recreational watercraft leaving public water accesses
MAISRC | Adam Doll – Graduate Student | [email protected]
Project Overview
Water collected from I/O and inboard cooling systems with the help of Tonka Bay Marina
MAISRC | Adam Doll – Graduate Student | [email protected]
Project Overview
Water collected from ballast systems with the help of Tonka Bay Marina
MAISRC | Adam Doll – Graduate Student | [email protected]
Project Overview
Samples are collected, preserved in ethanol, and examined in the lab using cross polarized light microscopy
Photos: MN DNR
MAISRC | Adam Doll – Graduate Student | [email protected]
Similar and Recent Studies
Veliger presence in residual water – assessing this pathway risk for Minnesota watercraft (2016) Gary Montz and Jodene Hirsch
Volume and contents of residual water in recreational watercraft ballast systems (2016) Tim Campbell, Todd Verboomen, Gary Montz, Titus Seilheimer
Overland dispersal of aquatic invasive species: A risk assessment of transient recreational boating (2001) Ladd E. Johnson and James T. Carlton
Post-establishment spread in large-scale invasions: Dispersal mechanisms of the zebra mussel (1996) Ladd E. Johnson and James T. Carlton
MAISRC | Adam Doll – Graduate Student | [email protected]
Continuing Research
Study will continue with data collection during the 2017 open water season (June-August)
Focused efforts on “difficult” areas to sample, or under represented categories Ballast tanks
Inboard and I/O engines
Personal watercraft
Test survival of veligers in residual water
Test veligers collected from engines for live/dead counts
MAISRC | Adam Doll – Graduate Student | [email protected]
Moving Forward
Working toward a better understanding of risk for varying watercraft
MAISRC | Adam Doll – Graduate Student | [email protected]
Moving Forward
Improved decontamination techniques
MAISRC | Adam Doll – Graduate Student | [email protected]