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Not necessarily. It depends on how thoroughly they use the resources before they move on. If it is something other than food pressures like weather which causes them to move, the food chain might not be substantially impacted by their temporary presence. Moreover, if they tend to forage farther from "home" and return with food, in order to keep their core living area unnoticed, for instance, the actual sign of their presence might occur some distance from the core they're occupying. Ummm ... no, not so much. Those other animals are far more likely to be part of the food supply than to be competition for food supply. There's little evidence supporting the idea that bigfoot is primarily herbivorous, much more evidence supporting the idea they are toward the carnivore end of the omnivore scale. MIB

While I am sure there are exceptions, small groups of BF's (1-4 but usually just 1 or 2) would have to have a territory in which they live some or all of the year. This is an area they know like the back of their hand including hunting grounds, safe spaces, dens, and water holes. I doubt they would survive if they spent their life wandering the country. The size of this territory is probably an easy 1 day walk for them which in rough numbers is probably twice that for active humans so perhaps 15-20 miles understanding that is not distance as a crow flies. Now I do believe they migrate once a year in to breeding zones and these migrations could be hundreds of miles. My 2 cents based on experience hiking the woods in which I have lived in 2 states and reading hundreds of cases for what it is worth.