Bell , Tisza 1 ; McKnight , Diane 2 1 INSTAAR, ÃÛÌÒ´«Ã½Æƽâ°æÏÂÔØ 2 INSTAAR, ÃÛÌÒ´«Ã½Æƽâ°æÏÂÔØ Green Lake 4 is an alpine lake in Rocky Mountain National Park, Colorado.. Many alpine lakes similar in productivity and elevation to Green Lake 4, have shown a recent shift in diatom species...