Method for generating buffers (circles) around nest to simulate breeding area (~ 3 ha) and breeding home range ( ~ 3700 ha) in QGIS¹.

Vector > Geoprocessing Tools > Buffer

Input layer = layer with nest locations
Distance = 1.96 / 6.86 km²
Segments = 5 / 15

Remember to save scratch layers as shapefiles.

1. These numbers come from research on Vancouver Island, published in McClaren et al. (2015). 3 ha is rounding up from 2.63 ha.
2. Distance refers to diameter. This is the diameter that produces a circle of approximately the correct area.