Yes of course. Resorts have a huge effect on animal ecosystems, especially on mammals, because the animals are afraid of humans. Most all resorts I have been to, you can find animal tracks in the snow in the morning all over the mountain, but you rarely see them during the day, part of this has to do with feeding patterns, but still, more animals would chill on the slopes if there weren't snowcats, sleds and skiers everywhere.
Some ski resorts try to preserve highly sensitive areas (or are forced to). Vail is a good example of this. Basically that whole little chain of hills is all completely developed, except for one bowl area, Mushroom, which has been identified as a potential Lynx habitat. Vail has done a good job, IMO, of clearly marking this and trying to prevent people from poaching.
A clarification about Wind Energy for those who are not aware. No resorts, to my knowledege, actually run on wind power. There might be a one, or a few on the East Coast, but I doubt it. The way the system works in Colorado is that basically there is one utility company for the majority of the state. They purchase power from individual coal plants, hydro stations, and wind farms, whatever. Then, they sell the electricity to the consumer. Now, when companies like Vail, or New Belgium, which are Colorado companies claim they are "wind powered," they aren't directly receiving their energy from wind. They are simply buying energy off of Excel's grid, but buying what are called Wind Credits, which suggest that you are getting energy from wind. Basically, the consumer pays a few cents extra per Kilowatt-Hour to say they are "wind powered". Better than nothing, but slightly midleading, in my opinion.