In sub-tropical climate, like in Roatán, Honduras, how fast do aerial roots of young strangler figs grow?
Ludwig et al. mention in their article Living bridges using aerial roots of ficus elastica – an interdisciplinary perspective: "An increasing amount of information is available on the mechanical properties of roots and their mode of anchorage in the ground for a variety of herbaceous species and woody species. However, only little is known on aerial roots in woody hemiepiphytic species." A few lines down, they point to the article Tension Wood in Aerial Roots of Ficus Benjamina L. by Zimmermann et al. However, I cannot access that, and I'm not sure that growth rate of aerial roots is even treated there.
Photo of aerial roots of unknown species that I took in Roatán last year. Didn't think about measuring growth rate back then.