#1 Grebe Pond Pond ecology is how life interacts in the water body. One factor that scientists observe is the amount of pond covered by aquatic vegetation. radio button field How Much of Grebe Pond is covered with Plant life?Please Click the option that best fits your observation. 1 No Vegetation 2 Light Vegetation 3 Moderate Vegetation 4 Heavy Vegetation 5. Ice Covered Link (required) Last modified on Aug. 28th, 2017 at 10:35am by .