How are epiphytes symbiotic?

Question

I understand epiphytes are not parasitic. But how exactly are they helping the tree on which they grow?

Answer 1

1. Primary relationship of commensalism
2. Epiphyte benefits, tree neither significantly helped nor harmed
3. Epiphytes use tree for structural support - nutrients and moisture come from surrounding environment
4. Sometimes characteristics of mutualism - contribute to microhabitats
5. Microhabitats = reason it feels cooler and more humid under tree canopy
6. Epiphytes increase leaf cover → greater condensation at the base of the tree