The scientists studied different types of moss found on trees in Madagascar's Marojejy National Park at various elevations. They wanted to understand why certain types of moss grow in specific places. By looking at the moss diversity at different scales, they found that there were more moss species differences at different elevations compared to smaller areas. This means the moss variety changed more through elevations than within small spaces. They also discovered that new moss species were more likely to appear at higher elevations. Overall, the moss variety changed a lot as you go up a mountain in Madagascar.