The role of aerial roots in hemiepiphytic life

Abstract. Certain characteristics of the growth of aerial roots were studied at La Selva Biological Reserve in Costa Rica. Experiments and measurements were conducted on roots of the genera Monstera and Philodendron that had grown from the canopy to within 2 meters above ground. Normal growth rate was evaluated on a daily basis by measuring the distance between root tip and the ground; mean growth rate was calculated as 5.9 cm per day. Growth rate in response to root damage was measured similarly on roots which had been cut above the root tip; the mean rate was calculated as .7 cm per day. These findings suggest that roots may more successfully respond to damage at the root tip where the majority of growth occurs. Additionally, this study suggests that the hemiepiphyte’s investment in the roots may be minimized, in light of the high likelihood of root damage.