2018 Early-Spring Curlyleaf Pondweed Delineation · 2019. 2. 16. · Freshwater Scientific Services...
Transcript of 2018 Early-Spring Curlyleaf Pondweed Delineation · 2019. 2. 16. · Freshwater Scientific Services...
CLP Delineation North Arm Bay (Lake Minnetonka; Hennepin Co, MN) – May 2018
© 2018 – Freshwater Scientific Services, LLC Page 1 of 5 ...
2018 Early-Spring Curlyleaf Pondweed Delineation North Arm Bay – Lake Minnetonka (#27-0133-13) Hennepin County, MN Surveyed May 15, 2018
Survey, Analysis, and Reporting by: James A. Johnson – Aquatic Ecologist, Freshwater Scientific Services, LLC
15771 Creekside Lane Osseo, MN 55369 [email protected] (651) 336-8696
CLP Delineation North Arm Bay (Lake Minnetonka; Hennepin Co, MN) – May 2018
© 2018 – Freshwater Scientific Services, LLC Page 2 of 5 ...
Purpose of Survey
This early-spring survey was designed to locate and delineate areas of curlyleaf pondweed (CLP) in North Arm Bay of Lake Minnetonka (#27-0133-13). This information will help to guide CLP management in the bay, and is required as a part of the DNR permitting process for herbicide treatments.
CLP Delineation Survey Freshwater Scientific Services surveyed North Arm Bay on May 15, 2018. During this survey, we navigated a meandering path over designated portions of the bay, with a focus on areas that supported dense CLP in 2017. While navigating this search path, we used a combination of surface observations, rake tosses, and sonar readings to locate and delineate areas of CLP growth. We conducted rake tosses to assess CLP abundance at ~200 locations. At each of these locations, we dragged a sampling rake over approximately 10 square feet of lake bottom and recorded the CLP density based upon the number of curlyleaf plants (stem count) retrieved on the rake. We used a hand-held Garmin GPS unit (GPS-MAP78) to record each of the sampled locations, and documented water depth, native plants present, CLP plant height, and CLP abundance (rake density rating; 1 to 3 scale as described below). The recorded water depths, CLP plant heights, and rake densities were linked to the appropriate GPS locations and then mapped using desktop GIS software.
CLP Rake Density Rating for Early-Spring Delineations
1 = 1 to 2 stems per rake toss 2 = 3 to 9 stems 3 = 10+ stems
Survey Method
CLP Delineation North Arm Bay (Lake Minnetonka; Hennepin Co, MN) – May 2018
© 2018 – Freshwater Scientific Services, LLC Page 3 of 5 ...
Surveyed: May 15, 2018 Method: Visual, Rake, Sonar Surveyor: JA Johnson
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North Arm Bay – Lake Minnetonka (#27-0133-13) Curlyleaf Pondweed Delineation Survey: May 15, 2018
Map produced for PLM Lake & Land Mgmt by:
15771 Creekside Lane Osseo, MN 55369 fixmylake.com (651) 336-8696
CLP Rake Density
1 2 3
1 2 3
May 2018
May 2017
Proposed Plots
Surveyed Path
CLP Delineation North Arm Bay (Lake Minnetonka; Hennepin Co, MN) – May 2018
© 2018 – Freshwater Scientific Services, LLC Page 4 of 5 ...
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Proposed Plots
North Arm Bay – Lake Minnetonka (#27-0133-13) Curlyleaf Pondweed Delineation Survey: May 15, 2018
Plot Area (acres)
Mean Depth
(ft)
Mean CLP
Density (0-3)
1 30.1 6.4 2.6 2 7.7 5.3 2.3 3 7.7 5.0 2.3 4 3.8 4.9 2.2 5 12.0 5.3 2.3 6 0.9 4.2 2.4 7 2.4 6.1 2.5 8 2.6 7.8 2.0
Total 67.2
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3 Surveyed: May 15, 2018 Method: Visual, Rake, Sonar Surveyor: JA Johnson
Map produced for PLM Lake & Land Mgmt by:
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15771 Creekside Lane Osseo, MN 55369 fixmylake.com (651) 336-8696
CLP Delineation North Arm Bay (Lake Minnetonka; Hennepin Co, MN) – May 2018
© 2018 – Freshwater Scientific Services, LLC Page 5 of 5 ...
Online Resources & Contacts
Minnesota Administrative Rules for Aquatic Plant Management https://www.revisor.mn.gov/rules/?id=6280 Minnesota DNR – Aquatic Plant Management Regulations & Permit Application Forms http://www.dnr.state.mn.us/apm/index.html
Keegan Lund Invasive Species Specialist Minnesota DNR [email protected] (651) 259-5828 Wendy Crowell AIS Management Coordinator Minnesota DNR [email protected] (651) 259-5085