I just had to refresh my memory on this but from what I found, Tiger Salamanders can dig their own burrows but it is believed (though not proven) that Spotted and Marbled Salamanders do not. I don't know if what the tiger salamanders provide for burrows is sufficient to support the other species or not -- during the productive part of the year they could probably all do just fine under logs and rocks but winter is the problem, as you know. You could always toss in a shrew or two but that's kind of a long shot that probably wouldn't work immediately. I'm kind of thinking as I type here but you could either try to create natural-like tunnels yourself or you could start off with just Tigers and let them settle for a year or so then add the other species. By that point in time there may be an ample amount of tunnels made by rodents and Tiger Salamanders. Just curious, did you plan on enclosing the habitat or will it be open to the wild blue yonder? If it's enclosed then it should be worth noting that Spotted Salamanders have been reported as deep as about 4 feet so it would be pretty important to bury the perimeter pretty deep -- 4 feet may be overkill though.

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