Nantuxent_Monitoring_alldata.csv
Vegetation and elevation data were collected by the Partnership for the Delaware Estuary.
Topographic Change: Transects were spaced at 3m intervals creating a 3m2 survey grid covering~0.12 hectares (1,170m2). This area included the marsh platform and mudflat to ~5m waterward of the installed breakwaters.
Fixed Monitoring Plots Analyses: Mean +/- SEM for elevation, vegetation robustness, bearing capacity, and mussel density were calculated as the average of three replicate plots per position per sub-area per year. Bearing Capacity (Substrate Firmness): Measured as the penetrative capacity of a slide hammer after 5 blows.
Vegetation Robustness in Fixed Monitoring Plots: Vegetation robustness integrates the horizontal and vertical obstruction of a parcel of vegetation into an overall unit-less index between 0-1 and is reported as a percentage. A score of 0% indicates no robustness, and a score of 100% indicates full robustness. By integrating the horizontal and vertical obstruction through the marsh canopy, a full picture of the three-dimensional structure of the vegetation with in the parcel is obtained.
The formula for calculation was: 𝑉𝑒𝑔𝑒𝑡𝑎𝑡𝑖𝑜𝑛 𝑅𝑜𝑏𝑢𝑠𝑡𝑛𝑒𝑠𝑠 = 𝐻𝑜𝑟𝑖𝑧𝑜𝑛𝑡𝑎𝑙 𝑉𝑒𝑔𝑒𝑡𝑎𝑡𝑖𝑜𝑛 𝐷𝑒𝑛𝑠𝑖𝑡𝑦+𝑉𝑒𝑟𝑡𝑖𝑐𝑎𝑙 𝑉𝑒𝑔𝑒𝑡𝑎𝑡𝑖𝑜𝑛 𝐷𝑒𝑛𝑠𝑖𝑡𝑦2
• Horizontal Vegetation Density: measured horizontal density by counting the number of bars visible (out of 10; 10cm width each) on a 1m obstruction board from 3m away within the same band of vegetation. The count was conducted at three heights: 0.25m; 0.50m; 0.75m. The height to which data was used for calculations (number of bars available; max=30, 10 at each height) was determined by the max vegetation height as measured by Blade Height below.
Calculations were as follows: 𝐻𝑜𝑟𝑖𝑧𝑜𝑛𝑡𝑎𝑙 𝑉𝑒𝑔𝑒𝑡𝑎𝑡𝑖𝑜𝑛 𝐷𝑒𝑛𝑠𝑖𝑡𝑦 = 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑏𝑎𝑟𝑠 𝑎𝑣𝑎𝑖𝑙𝑎𝑏𝑙𝑒 − 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑏𝑎𝑟𝑠 𝑣𝑖𝑠𝑖𝑏𝑙𝑒 /𝑛𝑢𝑚𝑏𝑒𝑟𝑜𝑓 𝑏𝑎𝑟𝑠 𝑎𝑣𝑎𝑖𝑙𝑎𝑏𝑙𝑒
• Blade Height: Twenty-five stems were measured, moving from the waterward corner towards the interior. Max blade height was used for the Vegetation Robustness calculation.
• Vertical Vegetation Density (Canopy Cover): Five measurements of ambient light were taken above each plot (corners and center) and at the ground level (penetrative light) beneath canopy using a light meter. Calculations were as follows:
𝑉𝑒𝑟𝑡𝑖𝑐𝑎𝑙 𝑉𝑒𝑔𝑒𝑡𝑎𝑡𝑖𝑜𝑛 𝐷𝑒𝑛𝑠𝑖𝑡𝑦 = 1 − (ratio of penetrative light: ambient light)
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Additional Information
| Field | Value |
|---|---|
| Data last updated | April 24, 2024 |
| Metadata last updated | April 24, 2024 |
| Created | April 24, 2024 |
| Format | CSV |
| License | Creative Commons Attribution |
| Datastore active | True |
| Has views | False |
| Id | b6e53bb6-4164-4398-a703-050e80f30921 |
| Mimetype | text/csv |
| Package id | 9120ced1-ef43-4064-8766-a0322fe0b6e1 |
| Position | 0 |
| Size | 52.5 KiB |
| State | active |
| Url type | upload |