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Deep Creek Lake Submerged Aquatic Vegetation (SAV) Survey: Progress Report DCL Policy Review Board Meeting 7/23/12. Locations of SAV Monitoring transects. Sampled DCL in August and September, 2010 (June 2010 was a pilot), June, August and September 2011, and June 2012

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Presentation Transcript
slide1
Deep Creek Lake Submerged Aquatic Vegetation (SAV) Survey:

Progress Report

DCL Policy Review Board Meeting

7/23/12

slide2

Locations of SAV

Monitoring transects

slide3
Sampled DCL in August and September, 2010 (June 2010 was a pilot), June, August and September 2011, and June 2012
  • Statistical analyses were used to analyze transect data for differences among sites and changes over time regarding:
    • Site-specific characteristics (transect length, maximum water depth and slope)
    • Species diversity, total mean SAV percent cover, individual species mean percent cover and species frequency of occurrence
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RESULTS for 2010 and 2011

  • There is a diverse SAV community in Deep Creek Lake
    • 16 species of vascular plants, 2 macroalgae
  • The majority of observed species showed no significant change in density or distribution from 2010 to 2011
    • The distribution and abundance of these species differ primarily by site, with annual changes occurring rarely
  • Species zonation is apparent at every site
    • Sagittaria cristata dominates the shallows
    • Potamogeton spp., Vallisneria americana, and Ceratophyllum demersum dominate the mid depths
    • Elodea canadensis, Myriophyllum spp., and macroalgae most commonly observed at greater depths.
  • Myriophyllum spp. (Water milfoil) densitydecreased at Honi Honi site, 2010 to 2011
  • Myriophyllum spp. frequencyof occurrence increased in Red Run Cove from 2010 to 2011, density did not change over time
  • There is no evidence that Myriophyllum spp. has increased from 2010 to 2011 based on the six study areas under this assessment
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>10% cover

10% - 40%

40% - 70%

no SAV

70% - 100%

Offshore

Offshore

June

August

September

June

August

September

June

August

September

June

August

September

June

August

September

June

August

September

SAV Density:

Red Run

Cove

State

Park

Honi

Honi

Green

Glade

Deep Creek

Cove

McHenry

2010

2011

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86 acres of Eurasian water milfoil EWM were mapped in a shoreline survey, July 9 and 10, 2012
    • This is 2.3% of the lake surface
    • 5.8% of shallow (less than 6m deep) water
    • Co-occurred with other species
  • Other, native, species of submerged grasses are far more common, specifically Potamogetons and Vallisneria, occupying virtually all of the shallows
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Going forward;
  • Continue the transect surveys at 6 locations in the lake
    • two more events in 2012 – weeks of August 21 and September 18
    • continue surveys in 2013 and beyond
  • Monitor/data analysis and assess Eurasian water milfoil
  • Continue to research management options for SAV, work with lake management and stakeholders to implement any control actions if necessary
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