Wow, what a nice question.
Yes Joanna did read that certain perfume esters would agitate bees.
Answer:
The forest with the most diverse population is the one that could have this distribution: 25 W, 25 X, 25 Y and 25 Z.
The one that has a distribution like this with 3 species, would be the one that is more diverse.
All would be affected because decomposers like to break down dead things meaning dead plants AND animals