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Spatial Distribution Patterns Of Mistletoe (Antidaphne Viscoidea: Eremolepidaceae, And Phoradendron Undulatum: Viscaceae) On Psidium Guajava (Mrytaceae) In Monteverde, Costa Rica, December 2003, Matthew Greenfield
Monteverde Institute: Tropical Ecology and Conservation
Spatial distributions of mistletoe are noticeably clustered but unexamined in Monteverde, Costa Rica. To better understand their spatial structure, I examined the dispersion of two species of epiphytic mistletoe (Antidaphne viscoidea: Eremolepidaceae and Phoradendron undulatum: Viscaceae) within and between host trees. Six sites on one hill in Cañitas, Costa Rica were surveyed for data relating to dispersion structure (nearest neighbor distance and frequency within host trees). Additional study was done on the spatial dispersion on the host tree Psidium guajava, and it was found to have clustered dispersions. Indices of dispersion and tests comparing observed results to Poisson distributions showed …
Effects Of Tree Buttresses On Nutrient Availability And Macroinvertebrate Species Richness, December 2003, Alyson P. Mack
Effects Of Tree Buttresses On Nutrient Availability And Macroinvertebrate Species Richness, December 2003, Alyson P. Mack
Monteverde Institute: Tropical Ecology and Conservation
This study tested the hypothesis that buttress microhabitats collect more leaf litter and have greater macroinvertebrate species richness, thereby increasing the leaf decomposition rate and providing more nutrient rich soil for the tree. Leaf litter deposition and decomposition rates, soil fertility (pH, [N], [P], |K]), and macroinvertebrate species richness (S, Smarg) were compared between microhabitats in buttressed and nonbuttressed trees and open areas in the lower montane cloud forest of Monteverde, Costa Rica. Results showed no significant difference between microhabitat types for soil pH levels (Kruskall-Wallis test, H= 3.188), soil [N] (Kruskall-Wallis test, H= 3.388), soil [P] (Kruskall-Wallis test, H= …