In any case, the 2003 survey indicated that subpopulations are fragmented, with probably no more than about 100 pairs occurring in any one area. It is not known how much the grebes move about until establishing breeding territories, but presumably, the species is fairly sedentary due to its flightlessness.
Based on the 2003 survey, it's clear that grebes are geographically dispersed and likely have limited movement until they establish breeding territories. This suggests they may be less mobile than other birds.