AIS SURVEY - Big Lake, Curly Leaf Pondweed (CLP), Big Lake, Round Lake, and Church Pine Lake Yellow Iris
Ecological Integrity Service, LLC conducted an AIS survey in June, 2024. Locations have marked the location of invasive species Curly Leaf Pondweed (CLP) and Yellow Iris on a map. Download PDF for full description.
Big Lake Potamogeton cripsus-curly leaf pondweed (CLP) Evaluation Results Summary
In June 2024, past CLP treatment sites were evaluated using the same sample points that were historically used. This allows for the evaluation of how quickly the CLP returns to these treatment sites. The map below shows the results of that survey.
June 2024, Ecological Integrity Service, LLC
The map shows that the CLP is slowly returning to the historically treated sites. The frequency and density of the CLP in these areas remain low. The white dots show no CLP, green dots are a rake density of one, yellow a rake density of 2, and tan CLP viewed near the sample point (within six feet). No beds were evident. The CLP was more profound this year at other lakes, so these results could be different in 2025.
Meander survey
A meander survey was conducted to evaluate the presence of CLP outside of the historical sample points. The map below shows the results of the CLP meander survey.
June 2024, Ecological Integrity Service, LLC
The most prevalent CLP occurs near the boat landing. There were some scattered clumps of CLP growing in this area. The rake density of each clump was a two. There were no beds of CLP that could be delineated as the CLP observed were small clumps of plants growing, with clumps widely scattered.
No CLP was observed in Round Lake or Church Pine Lake.
Early season AIS Meander Survey
An early-season AIS meander survey was conducted on Big Lake, Church Pine Lake, and Round Lake. The early season survey is conducted in late spring/early summer to observe species that grow or are more easily identified. There are two species that this pertains to. They are CLP, which was evaluated separately, and yellow iris. Yellow iris is identified best when it flowers. This survey occurred when yellow iris was flowering.
The map below shows the sites yellow iris was observed. Note the large number of sites. This plant appears to be expanding and although no large beds occur, mitigation should be considered.
June 2024, Ecological Integrity Service, LLC
Yellow iris is mitigated using herbicide or manual removal. Manual removal can be difficult, depending on the substrate it is contained in. A permit is needed to apply herbicide.