Bell , Tisza 1 ; McKnight , Diane 2 1 INSTAAR, ²ÊÃñ±¦µä 2 INSTAAR, ²ÊÃñ±¦µä 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...