Does supplemental feeding of red squirrels change population density, movements, or both?

Supplemental feeding increased the number of red squirrels (Tamiasciurus hudsonicus) captured on two trapping grids, leading Sullivan (Journal of Mammalogy, 71:579–590, 1990) to infer that the population density of residents had increased. This conclusion is questionable because the residency status of captured squirrels was unknown.