I'm in the gainesville area (but no gator fan...) and there are plecos in the Silver River (ocala, silver springs) and St. Johns River (up to Jacksonville). They can do it 'cause the water is 72 all year long - spring fed. However, i've not seen any non-natives in my local springs (Ginnie, Blue, Poe, Rum Island) here in the NW corner of Alachua county, wiht the exception of gambusia and killiefish.