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2018 update: Demographic census in remnants

As always, demo was a huge job this year. This season we added 3868 demo records and about 1539 survey records to our database. After over 20 years of this method, we are starting to get a very good idea of the demography of Echinacea in Solem Township.

So how do we do demo? When we find a new flowering Echinacea plant, we give it a tag and get its location with a survey-grade GPS (better than 6 cm precision). Then, we can revisit this plant for years to come and monitor its survival and reproduction. We’re monitoring over 10,000 plants as of 2018. With this many records, organizing demap in the future is going to be a big task!

We made some small adjustments to how we do total demo and flowering demo (we do flowering demo in every remnant now). Now, in our big plots, we only do a sample of the plants instead of total demo. Check out the updated table below (remember we did flowering demo everywhere). We still managed to shoot thousands of points, take even more demography records, and, as always, follow the colored flags!

Total Demo BTG, Common Garden,  DOG, East of Town Hall, KJs, Krusemark, Landfill West, Loeffler Corner East, Near Town Hall, Nessman, NNWLF, NRRX,   recruit he, recruit hp, recruit hs, recruit el, recruit hw, recruit ke, recruit kw, RRX,  RRXDC, South of Golf Course, Steven’s Approach, transplant plot, Tower, Town Hall, West of Aanenson, Woody’s
Sample Demo Aanenson, Around LF, East Riley, Hegg Lake, Elk Lake Road East, Golf Course, Landfill, Loeffler Corner, North of Golf Course, NWLF, On 27,  Riley, Staffanson,  Yellow Orchid Hill

Evan and Will doing demo by the corn. While you might not be able to see the echinacea, we promise, it’s under there!

Year started: 1996

Location: Roadsides, railroad rights of way, and nature preserves in and near Solem Township, Minnesota.

Overlaps with: Flowering phenology in remnants, fire and flowering at SPP

Data collected: demo records include Flowering status, number of rosettes, number of heads, neighbors within a 12 cm radius of plants found. These are all taken with PDAs that sync with an MS Access database. They are all transferred to the demap R repository in bitbucket with git version control.

GPS points shot: Points for each flowering plant this year shot mostly in SURV records, stored in surv.csv. Each location should be either associated with a loc from prior years or a point shot this year.

Products:

  • Amy Dykstra’s dissertation included matrix projection modeling using demographic data
  • Project “demap” merges phenological, spatial and demographic data for remnant plants

You can find out more about the demographic census in the remnants and links to previous posts regarding it on the background page for this experiment.

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