This report is submitted to show total progress to date on lake-wide Eurasian milfoil management on Upper Saranac Lake.  The report has been produced by Aquatic Invasive Management, LLC and is only reflective of records gathered and reported by AIM.

Trends

The graph below shows the total bags harvested each week from week 1 to week 10 in the past three years on Upper Saranac Lake.  The X axis is the week number and the Y axis is the bag amount.

Trends

Thus far 2013 shows lower bag totals by week than the previous two years which is indicative of a reduced milfoil population and lower density of milfoil growth.

total bags

The chart above illustrates that the total weight of milfoil removed from Upper Saranac Lake by week 10 of the past three years has been in steady decline with 2013 as the lowest total.  This is another indication of lower milfoil population numbers and densities.

Harvest Maps

The following maps show all collected GPS harvest data for the first 10 weeks of 2012 and 2013 projected on a map at the same scale.                                 Harvest Maps

 

Our take…

So far 2013 shows the lowest bag count by week and by total of any of the past three years.  This is a great sign no matter how you look at it.  It tells us a couple of things:

  • The plants are not dense
  • The plants are not being allowed to become dense

So in other words, between our dive crew and Guy Middleton we are staying on top of all mifoil growth lake-wide.  We are not allowing it to go un-harvested for long enough to get big and bushy and that means far less natural fragmentation is occurring.  Less fragmentation equals less spread and fewer surprise appearances of milfoil in previously un-infested areas.

When looking at the harvest maps side by side it looks like some areas are thinner in 2013 and some are thicker and some are new and some old ones are gone.  It is important to remember that we mark all plant growth harvested the same way whether it is old or young, big or small.  We try to represent its density by clustering our waypoints close together.  On a map at this scale a “red blob” can look like it must mean dense milfoil when it actually is only showing a small amount of individual plants over a large area.  Once you make the points visible on a map and zoom the map out it appears as if they are one continuous blob.  The following is a link to the interactive version of the 10 week map which allows you to zoom in and see how the data looks up close:

http://www.milfoilremoval.com/Maps/usl_1st_10wks_2013.html