December 06, 2009
A new study, published in Tropical Conservation Science, investigates how tree communities respond to both distance to edges and canopy openness in a tropical montane forest at Las Cruces Biological Station, SW Costa Rica. Luis Cayuela of the Universidad de Granada in Spain and colleagues found that proximity to the forest edge does not increase the rate of canopy openness. When looking closely at the separate effects of edges and natural canopy gaps, a small or even negligible effect of edges on tree structure, diversity and composition was found, whereas natural canopy gaps exerted a stronger influence on these variables. The study concluded that edge effects may be minimized — or even suppressed — in older fragments through the sealing of edges by a thick growth of thin stems and through lateral growth of tree crowns; whereas canopy gap formation remains an active force that can create micro-environmental conditions that have significant effects on plant communities.
CITATION: Luis Cayuela, Carolina Murcia, Anjanette A. Hawk, Javier Fernández-Vega, Federico Oviedo-Brenes 2009. Tree responses to edge effects and canopy openness in a tropical montane forest fragment in southern Costa Rica Full Text PDF. Tropical Conservation Science Vol.2(4):425-436.