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Fringed Water Lilly Lochmaben Lochs Ewan Lawrie Freshwater Advisor - - PowerPoint PPT Presentation
Fringed Water Lilly Lochmaben Lochs Ewan Lawrie Freshwater Advisor - - PowerPoint PPT Presentation
Fringed Water Lilly Lochmaben Lochs Ewan Lawrie Freshwater Advisor SNH Lochmaben Mill Loch Mill Loch Source: Lochmaben and District Community Initiative Fringed Water Lily Source: Wikipedia Source: https://scotland-species.nbnatlas.org/
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Mill Loch
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Source: Lochmaben and District Community Initiative
Mill Loch
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Source: Wikipedia
Fringed Water Lily
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Source: https://scotland-species.nbnatlas.org/
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Dense floating mats can form
- n the waters surface
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Dense floating mats can form
- n the waters surface
- Affecting recreational activities
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Dense floating mats can form
- n the waters surface
- Affecting recreational activities
- Restricting light to the
exclusion of native plants
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Dense floating mats can form
- n the waters surface
- Affecting recreational activities
- Restricting light to the
exclusion of native plants
- Decreasing oxygen exchange
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Dense floating mats can form
- n the waters surface
- Affecting recreational activities
- Restricting light to the
exclusion of native plants
- Decreasing oxygen exchange
- Increasing sediment levels
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Potential coverage based on depth
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Mat Forming Vegetation
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Control Options Reducing Nutrient Levels Dewatering Shading Physical Control Chemical Control
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Control Options Reducing Nutrient Levels
- Reducing the nutrient levels
would not only help control Fringed Water Lily but other invasive species as well
- Achieving this is challenging
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Control Options Dewatering
- Fringed Water Lily is resistant to
dehydration so dewatering is unlikely to be successful.
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Control Options Shading
- Some areas were shaded using
tarpaulin in the late 2000s
- There were difficulties with this
due to wave action.
- It impacted recreational use of
the loch
- People interfered with the trial
plots
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Control Options Physical Control
- Removal of cut material would
reduce the nutrient levels in the loch
- Cutting risks spreading the
plant.
- Cutting would probably be
required more than once a year.
- The plant is intergrown with the
swamp and eradication would be difficult
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Control Options Chemical Control Dichlobenil granulate was trialed in 2008/09
- Dichlobenil was used for
general annual and perennial weed control It has low
- solubility. It is moderately
persistent in soils and very persistent in water. It is moderately toxic to mammals, aquatic organisms, honeybees and earthworms
- It was banned in March 2010
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Control Options Chemical Control
- Spraying with Glyphosate has
taken place for a number of years.
- Use of a sticking agent
improved its effectiveness
- Working with partners
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Source: Lochmaben and District Community Initiative
Spraying with Glyphosate 1998- 2001 Centre for Aquatic Plant Management 2002-2005 Dumfries and Galloway Rangers 2006-2009 Lochmaben and District Community Initiative 2011-2017 Dumfries and Galloway Rangers
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Spraying with Glyphosate
- Has probably helped
reduce the extent of Fringed Water Lily but has not eradicated it
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Spraying Issues Spraying from the bank using a boom did not reach all areas
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Spraying Issues The target plant was intergrown with non target species.
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Spraying Issues It grows from relatively small seedlings which can be hard to spot. Particularly amongst tall vegetation.
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Spraying Issues Dead material rots down and becomes part of the internal nutrient loading of the loch
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Spraying Issues Increased public concern
- ver use of pesticides.
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Next Steps We are currently in discussions with SEPA about ways forward.
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Thank you
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