Throughout the 1980-1990's there was a major loss of population in both wolves and moose. The decrease of moose was due to an environmental change that affected them. Winters in Isle Royale were too cold for them to survive. Because of the extreme cold temperatures, moose perished. Since then, wolf population has increased, but moose population has stayed the same/gradually diminished. (It hasn't increased since then at all.) Even though moose population has stayed the same and wolf population has increased, both populations have very little organisms left.